This document provides an overview of the scope of work for overhauling a turbine. It outlines the preparation, alignment checks, disassembly, non-destructive testing, fact-finding, reassembly, and commissioning processes. The specific tasks listed include opening bearing pedestals, uncoupling various components, checking alignments, disassembling the high pressure and low pressure turbines and valve blocks, performing non-destructive testing, inspecting individual parts, reassembling components, and conducting final alignment checks and commissioning. Detailed procedures are provided for selected tasks such as opening bearing pedestals and uncoupling various turbine sections.
This deals with Boiler feed pumps used in power plants .
contains details about the KHI and FK series pumps , technical parameters and maintenance prctices followed for these pumps
The discussion on "Handling of Turbines During Emergencies" has been detailed in the ppt. Some case studies are also discussed in the session where the course participants express their difficulties while coming across the emergencies in handling the turbines at their locations.
This deals with Boiler feed pumps used in power plants .
contains details about the KHI and FK series pumps , technical parameters and maintenance prctices followed for these pumps
The discussion on "Handling of Turbines During Emergencies" has been detailed in the ppt. Some case studies are also discussed in the session where the course participants express their difficulties while coming across the emergencies in handling the turbines at their locations.
Thermal Power Plant Simulator, Cold, warm and Hot rolling of Steam TurbineManohar Tatwawadi
The presentation describes the cold rolling, warm rolling and hot rolling and synchronising of steam turbine. The Temperature Matching Chart for Turbine metal and Steam is also discussed in the presentation
Turbine Stress Control Logic, Calculation & WorkingTahoor Alam Khan
Turbine Stress Control is one of the complex logics of BHEL turbine. This presentation clearly explains the Logic, working, calculations and influence of the same on operation of steam turbine. For further details and understanding, I can be reached on tahoorkhn03@gmail.com.
For all the Gas Turbine lovers, the following presentation is aimed to cover the Major Inspection of the Gas Turbine (GE, Fr-9E). It is weaved with all of the major activities involved in MI, tools and tactics with addition of the reference values. Each activity is described with aid of pictures for detailed understanding.
The presentation discuss about the operations, causes and remedies for the facing emergencies of steam Turbines. Specially for the 210MW LMW units. The emergencies can be created on simulator and studied on the simulator ACCORDINGLY.
Thermal Power Plant Simulator, Cold, warm and Hot rolling of Steam TurbineManohar Tatwawadi
The presentation describes the cold rolling, warm rolling and hot rolling and synchronising of steam turbine. The Temperature Matching Chart for Turbine metal and Steam is also discussed in the presentation
Turbine Stress Control Logic, Calculation & WorkingTahoor Alam Khan
Turbine Stress Control is one of the complex logics of BHEL turbine. This presentation clearly explains the Logic, working, calculations and influence of the same on operation of steam turbine. For further details and understanding, I can be reached on tahoorkhn03@gmail.com.
For all the Gas Turbine lovers, the following presentation is aimed to cover the Major Inspection of the Gas Turbine (GE, Fr-9E). It is weaved with all of the major activities involved in MI, tools and tactics with addition of the reference values. Each activity is described with aid of pictures for detailed understanding.
The presentation discuss about the operations, causes and remedies for the facing emergencies of steam Turbines. Specially for the 210MW LMW units. The emergencies can be created on simulator and studied on the simulator ACCORDINGLY.
Situational Judgement Test - Preparation Guide Part #1JobTestPrep
JobTestPrep's introduction to Situational Judgement Tests (SJTs). This is the first tutorial in a series of three, each covering a different aspect to help you pass Situational Judgement Tests. The entire series is found in our online SJT practice packs. Free SJT test online : http://www.jobtestprep.co.uk/practice_situational_judgement
195 Accounting Principles Questions and Answers for Accounting Exams and Job ...Rahat Kazmi
These 195 Answers have been put together to most popular Interview Questions. These questions can also be useful for Exams but I would recommend further reading. Please note that the Answers are based on US GAAP, but I have seen these are very similar to UK GAAP. If you like my efforts, please follow me to receive more documents like this in the future.
Drop is any object that falls from its previous static position under its own weight. Dropped Objects are among the Top 10 causes of Fatality and Serious Injury in the Oil and Gas Industry. Our focus would be on products and systems that can be integrated into the customer’s safety management systems to identify potential dropped object hazards, prevent their occurrence, and mitigate their outcome. We would share information on a broad array of tools, products and deliverables, including inspection programmes, awareness videos and presentations, safety checklists, guidelines, procedures and best practices as a part of building up awareness on DROPS and also offer our customers to buy these special dropped object prevention products and services from one source.
Concept is simple - if we can keep our hands at a distance while doing tasks like guiding, positioning, pushing, pulling slung loads or doing anything to bring it to its final place – we avoid a “caught between” kind of situation and protect our hands.
The Marketing Services Unit of PSC Dubai in Silicon Oasis DDP is responsible for business development and trading of our key brands in the Industries worldwide. The portfolio includes oilfield equipments, bar and rod mill spares (pinch rolls, guide rollers, HSS rolls, etc) and PSC Hands-Free Safety Tools.
Description:
International sourcing company based in Dubai Free Zone.
Focus:
Specializes in equipment, spare parts, and consumables
procurement.
Backed By:
Supported by Project Sales Corp, a leading rig parts supplier in
India.
Offerings:
Supplies PPE, workplace safety gear, and oilfield lubricants.
Mission:
Importing products needed by drilling rig operators in India.
Competitive Pricing:
Quotes competitive prices for imported goods.
Location Advantage:
Located in a Free Trade Zone, exempt from VAT and Customs.
With over thousands of products in its stocking range, Project Sales Corp is undoubtedly India’s largest oilfield ropes, soaps, dopes store. We call it the Rig Essentials Line.
Take a look inside to see some of the key products that we stock in this category of MRO, Tools, Safety and Rig Essentials. Whether you are a rig operator or an oilfield supplier, you will find consolidating your purchases with us for the items we stock would be the right way to service your end-users requirement the quickest way!
How We Work
Imagine using a $200 a pail dope and using a $1 dope brush, the savings you have with the brush costs, you don’t realise the loss you incur with the dope as a faulty brush creates pilferage of materials, improper application of dopes and overall a total higher costs than the savings you made buying the cheap dope brush.
Keeping this logic in mind that a cheap substitute ultimately costs more in total costs, Project Sales Corp has built up a portfolio of proven good quality high performance products from India and worldwide used on-board drilling rigs. They improve reliability, reduce overall costs, downtime and provide user a peace of mind with daily essentials on the rig.
We don’t stock the quality that generally sells in the local markets, we bring in products that have proven themselves in being able to make a positive difference. That’s sums up our strategy to this core product category – The rig essentials line of Ropes, Soaps, Dopes that has contributed over $25 million of revenues in last 10 years.
The daily materials used on a rig are colloquially referred to as Rope, Soap, and Dope.
➢ Rope referred to chains and ropes used to hoist materials up to derricks and platforms
➢ Soap was used in reference to products and tools used to clean machinery, tools, the rig, and the workers themselves
➢ Dope meant the lubricants, grease, and fuel - the essential liquids that were employed to keep machinery and the rig up and running.
Our workplace safety range comprises of products that can mitigate various kinds of risks in workplace or improve safety facility identification to assist workers with working in a safer environment. Key products include Slips Trips and Falls protection with Anti-skid tapes, Barricading Tapes, Lane Marking Tapes, 5S Program, Utility Hooks for Cables and Hoses, Facility signages, Traffic control products, and more. We also stock scaffolding and ladder tags, small instrument tagging systems like Microtags and Nanotags, Confined Space Entry Kits, etc. PSC Whipchecks are used as hose restraints to prevent hoses from whipping. The Nightstick range of intrinsic safety flashlights range with world’s first dual light improves safety with visibility for near and far objects, at the same time. Safepads improve safety while working with scaffold and all kinds of protruding objects.
PSC Houston Oilfield Supplies LLC aims to supply OEM parts to drilling rigs worldwide. With over two decades of experience in the drilling spares business in India and Dubai, over 450 suppliers worldwide, of which over 200 are based out of Houston alone, we are the supplier that’s closest to the source for these parts in the United States.
Based out of Houston, PSC Houston Oilfield Supplies LLC can quickly ship out parts to the rigs thus reducing downtime. There is nothing in specific we stock, and there is no limit to what we can source, you just need to let us know. We can reach out to our extensive vendor base and find out the source with the quickest delivery.
With trained international sourcing teams supporting from India, Dubai and Houston, you can expect to get the fastest response to your requirements. Our India unit Project Sales Corp (PSC) stocks over a 1000 sku’s of stuff that goes out to the oilfield and services all the drilling contractors, EPC companies in offshore and oilfield services companies. PSC Gulf supplies parts to some of the leading operators in the Middle East. The PSC Houston office works closely with the OEMs to get you the most competitive pricing and the shortest lead time for critical parts.
With a team of 40 people spread across our offices, all focussed on one thing – drilling rig parts- we are just an email or call away.
With over two decades of experience in the drilling spares business in India and Dubai, over 450 suppliers worldwide, of which over 200 are based out of Houston alone, we are the supplier that’s closest to the source for these parts in the United States.
With offices in India, Dubai and US, we can deliver rig spares worldwide.
Lubrication accounts for a small part of the overall maintenance budgets and the right lubricant goes a long way to reduce downtime, improve reliability and enhance equipment life.
Leading bearing manufacturers have conducted studies to find out the reasons for premature bearing failure. More than one-third of bearing failures is due to imperfect lubrication. In many more cases, which cannot be traced directly to imperfect lubrication, it’s still the underlying cause.
Project Sales Corp is pleased to introduce its Sealing Compounds range. We represent one of the most exhaustive range of Sealing Compounds from around the world that finds application in sealing steam and gas turbines, compressors, pumps, gearboxes, flanges and more.
An ideal flanged joint would consist of two, mirror-finish, perfectly flat and parallel surfaces bolted directly together to create a leak-free seal. However, manufacturing processes do not allow for perfect sealing surfaces. Most flange faces have surface irregularities that cannot be sealed without the use of some type of compressible, resilient material or a combination of materials between them to seal the fluid being transferred. This is true even for the most finely machined surfaces as a turbine flange where the surface asperities can create a leak situation.
Slung loads are dangerous. Going close to it exposes one to various injuries, pinch, crush and foot and body injuries. There is tension in the load until it rests in the final position. There are obvious chances of injuring the fingers and hands and getting too close to the red zone where a suspended dropped object could fall on the foot or body. You also expose yourself to lacerations and abrasion when the object you are trying to guide is sharp or rough.
PSC introduces the PSC Guide-it SlingGrab, a simple to use load positioning tool to manage slung loads by using the special head designed for chains and wire rope slings, webbing slings, to grab and manoeuvre the slung loads while it moves to its final position. Concept is simple - if we can keep our hands at a distance while doing tasks like guiding, positioning, pushing, pulling slung loads or doing anything to bring it to its final place – we avoid a “caught between” kind of situation and protect our hands.
Available in 4 lengths and competitively priced, you can now make it a rule, no grabbing slings by hand, always use a PSC Guide-it SlingGrab. Please see attached for more details.
www.pschandsafety.com
www.pschandsfree.com
GasGrab - Project Report on Cylinder Lifting and Benefits with GasGrabProject Sales Corp
In 2007 Bradford University carried out a study of the GasGrab™. The 34 page report that came from this study includes a large amount of technical data that highlights the health and saftey benefits of using GasGrab™ when lifting gas cyclinders.
Click here to download and view the report.
Gasgrab™ is a property of Arrow (Newbury) Ltd and is marketed in India by Project Sales Corp www.pschandsfree.com
PSC is India’s largest manufacturer & exporter of Hands-Free and Hands-Off Safety Tools that enables you to carry out tasks in the oilfield without getting your hands close to the pinch and crush points. PSC hands-free safety tools can help to reduce hand and finger injuries by facilitating safe movement of the load by controlling the load from a distance, without physically touching the load. The product range includes Push/Pull Poles, Anti-Tangle Taglines, Hose Lifters, Lift Assist Pipe Lifting Aids, Slogging Spanner Holders, etc. In 2020-2021 it has exported products to USA, Canada, Africa, Mid-East, South East Asia.
PSC is India’s largest manufacturer & exporter of Hands-Free and Hands-Off Safety Tools that enables you to carry out tasks in the oilfield without getting your hands close to the pinch and crush points. PSC hands-free safety tools can help to reduce hand and finger injuries by facilitating safe movement of the load by controlling the load from a distance, without physically touching the load. The product range includes Push/Pull Poles, Anti-Tangle Taglines, Hose Lifters, Lift Assist Pipe Lifting Aids, Slogging Spanner Holders, etc. In 2020-2021 it has exported products to USA, Canada, Africa, Mid-East, South East Asia.
PSC has invested in stocking the consumables that are required on drilling rigs and is now building up inventory of all Ropes-Soaps-Dopes items. For more information visit us at www.pscrigessentials.com or www.rigconsumables.com or send us an email at rfq(at)projectsalescorp.com
PSC has invested in stocking the consumables that are required on drilling rigs and is now building up inventory of all Ropes-Soaps-Dopes items. For more information visit us at www.pscrigessentials.com or www.rigconsumables.com or send us an email at rfq(at)projectsalescorp.com
PSC has invested in stocking the consumables that are required on drilling rigs and is now building up inventory of all Ropes-Soaps-Dopes items. For more information visit us at www.pscrigessentials.com or www.rigconsumables.com or send us an email at rfq(at)projectsalescorp.com
Kseniya Leshchenko: Shared development support service model as the way to ma...Lviv Startup Club
Kseniya Leshchenko: Shared development support service model as the way to make small projects with small budgets profitable for the company (UA)
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Digital Transformation and IT Strategy Toolkit and TemplatesAurelien Domont, MBA
This Digital Transformation and IT Strategy Toolkit was created by ex-McKinsey, Deloitte and BCG Management Consultants, after more than 5,000 hours of work. It is considered the world's best & most comprehensive Digital Transformation and IT Strategy Toolkit. It includes all the Frameworks, Best Practices & Templates required to successfully undertake the Digital Transformation of your organization and define a robust IT Strategy.
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In the Adani-Hindenburg case, what is SEBI investigating.pptxAdani case
Adani SEBI investigation revealed that the latter had sought information from five foreign jurisdictions concerning the holdings of the firm’s foreign portfolio investors (FPIs) in relation to the alleged violations of the MPS Regulations. Nevertheless, the economic interest of the twelve FPIs based in tax haven jurisdictions still needs to be determined. The Adani Group firms classed these FPIs as public shareholders. According to Hindenburg, FPIs were used to get around regulatory standards.
Enterprise Excellence is Inclusive Excellence.pdfKaiNexus
Enterprise excellence and inclusive excellence are closely linked, and real-world challenges have shown that both are essential to the success of any organization. To achieve enterprise excellence, organizations must focus on improving their operations and processes while creating an inclusive environment that engages everyone. In this interactive session, the facilitator will highlight commonly established business practices and how they limit our ability to engage everyone every day. More importantly, though, participants will likely gain increased awareness of what we can do differently to maximize enterprise excellence through deliberate inclusion.
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Enterprise Excellence is a holistic approach that's aimed at achieving world-class performance across all aspects of the organization.
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A way to engage all in creating Inclusive Excellence. Lessons from the US military and their parallels to the story of Harry Potter. How belt systems and CI teams can destroy inclusive practices. How leadership language invites people to the party. There are three things leaders can do to engage everyone every day: maximizing psychological safety to create environments where folks learn, contribute, and challenge the status quo.
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Dr. William Harvey is a seasoned Operations Leader with extensive experience in chemical processing, manufacturing, and operations management. At Michelman, he currently oversees multiple sites, leading teams in strategic planning and coaching/practicing continuous improvement. William is set to start his eighth year of teaching at the University of Cincinnati where he teaches marketing, finance, and management. William holds various certifications in change management, quality, leadership, operational excellence, team building, and DiSC, among others.
Cracking the Workplace Discipline Code Main.pptxWorkforce Group
Cultivating and maintaining discipline within teams is a critical differentiator for successful organisations.
Forward-thinking leaders and business managers understand the impact that discipline has on organisational success. A disciplined workforce operates with clarity, focus, and a shared understanding of expectations, ultimately driving better results, optimising productivity, and facilitating seamless collaboration.
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In this deck, you will learn the significance of workplace discipline for organisational success. You’ll also learn
• Four (4) workplace discipline methods you should consider
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3.0 Project 2_ Developing My Brand Identity Kit.pptxtanyjahb
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Discover the innovative and creative projects that highlight my journey throu...dylandmeas
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Sustainability has become an increasingly critical topic as the world recognizes the need to protect our planet and its resources for future generations. Sustainability means meeting our current needs without compromising the ability of future generations to meet theirs. It involves long-term planning and consideration of the consequences of our actions. The goal is to create strategies that ensure the long-term viability of People, Planet, and Profit.
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1. Siemens, Wesel, Germany
NG90/81/45-4IZ
S.Rameshkumar Mechanical Maintenance +WK80/90/0-3RHP
Turb+SA21LP Turb
Page 1 of 75
TURBINE OVERHAULING
Scope of Work
INDEX
1.0 Work Related Documents :
1.1 List of drawings.
1.2 Turbine Service Manual – Siemens Ref : ESO/0689/86-05-13/KWU/la-mg.
2.0 Preparation for Inspection.
3.0 Alignment Checks :
3.1 Open Bearing pedestal.
3.2 Uncouple main oil pump.
3.3 Uncouple Generator.
3.4 Uncouple LP rotor.
3.5 Check alignment between the Main Oil Pump and the HP Turbine.
3.6 Check alignment between the HP Turbine and the LP Turbine.
3.7 Check alignment between the Generator and the LP Turbine.
3.8 Check internal alignment of the LP Turbine.
3.9 Check internal alignment of the HP Turbine.
4.0 Disassembly :
4.1 HP Turbine.
4.2 LP Turbine.
4.3 Valve blocks.
4.4 Lube oil system.
5.0 Non-Destructive Testing.
6.0 Fact-Finding :
6.1 Components, Parts and Individual areas to be inspected.
6.2 Component / Part findings checklist.
6.3 List of Fact-Finding Tools, instruments and accessories.
6.4 List of potential findings.
7.0 Reassembly :
7.1 LP Turbine.
7.2 HP Turbine.
7.3 Valve blocks.
7.4 Alignment checks.
7.5 Lube oil system.
8.0 Commissioning :
T-OH-procedure F.K. 24 November 2006
2. Turbine Overhauling - Scope of Work
Page 2 of 75
2.0 PREPARATIONS FOR INSPECTION :
♦ Evaluate latest operating records and related data.
♦ Check for availability of spare parts.
♦ Perform functional inspection of modular units.
♦ Perform leak checks in the form of visual and tactile inspections.
♦ Check shaft-line grounding.
♦ Check turbine-generator running behavior prior to shutdown; perform vibration measurements.
♦ Set up jobsite; ready all scaffolding, tools etc.
♦ Measure vacuum reduction rate.
♦ Shutdown the system.
♦ Cool turbine-generator via turning gear operation.
♦ Disconnect oil pumps, with the exception of the lift-oil pump.
♦ Remove turbine enclosure.
♦ Remove insulation.
♦ Remove vibration pickups.
♦ Protect ends of cables against damage.
General Recommendations :
♦ Use only “Silicon-free” lubricants on the oil side.
♦ Observe all relevant accident prevention regulations.
♦ Observe all relevant fire prevention regulations.
♦ Exercise caution in the handling of cleaning agents and acids (Wear protective clothing).
♦ Observe manufacturer’s parts identification system at each step of assembly/disassembly.
♦ The following sealants are recommended :
♦ For the steam side : Birkosit.
♦ For the oil side : Hylomar.
♦ The followings lubricant is recommended : Gleitmo 160
T-OH-procedure {F.K.} 24 November 2006
3. Turbine Overhauling - Scope of Work
Page 3 of 75
3.0 ALIGNMENT CHECKS :
3.1 Open Bearing Pedestal :
Procedure :
♦ Record pedestal position indicator readings on the HP Turbine (Z 37, Z 38; View VI, Section U1-
U1) and LP Turbine (Z 58, Z 60; Detail V4).
♦ Record rotor position indicator readings on the LP turbine (Z 72; Part 3).
♦ Remove top of rear bearing pedestal (Z 22)
♦ Remove seal rings from the top and bottom halves of the bearing pedestal.
♦ Remove center top-half bearing pedestal (Z 15).
♦ Remove seal rings from the top and bottom halves of the bearing pedestal.
♦ Dismantle and store piping from the front top-half bearing pedestal.
♦ Remove front top-half bearing pedestal (Z 1).
♦ Remove seal rings from the top and bottom halves of the bearing pedestal.
♦ Remove top-half thrust bearing (Z 3).
♦ Remove thermocouples (Z 7) from the top and bottom halves.
♦ Check and record the rotor position in the bottom-half thrust bearing.
♦ Measure and record the alignment dimensions of the HP and LP turbines (cf. assembly data sheet).
♦ Remove bottom-half thrust bearing.
♦ Measure and record axial movement of the shaft line (cf. assembly data sheet).
♦ Reassemble bottom-half thrust bearing
3.2 Uncoupling Main Oil Pump :
Procedure :
♦ Remove hall generators (Z 14)
♦ Remove enclosure (Z 10; part 60, 65)
♦ Check identification markings on the coupling parts (part 100)
♦ Remove centerpiece of sleeve.
♦ Remove circlip
♦ Pull both sleeve sections off of the hubs.
T-OH-procedure {F.K.} 24 November 2006
4. Turbine Overhauling - Scope of Work
Page 4 of 75
Evaluation :
♦ Teeth.
♦ Clean couplings parts, protect against corrosion and store.
3.3 Uncoupling Generator :
Procedure :
♦ Check identification markings on the coupling flanges, bolts and nuts (Z 72.1)
♦ remove coupling nuts.
♦ Remove coupling bolts.
♦ Clean coupling nuts and bolts, protect against corrosion, and store.
♦ Turn jack screws in up to contact face.
♦ Continue turning the jack screws to push apart the coupling flange.
♦ Push the generator rotor up to stop in the positive direction.
3.4 Uncoupling L. P. rotor :
Procedure :
♦ Position the lifting fixture (Z 21)
♦ Provide metal strips for the support bearing.
♦ Check the identification markings on the coupling flange, bolts and nuts (Z 72).
♦ Remove coupling nuts.
♦ Turn jack screws in up to the contact face.
♦ Continue turning jack screws to press the two halves of the coupling flange apart by 3mm.
♦ Hand-tighten the coupling nuts.
3.5 Check Alignment between the Main Oil Pump and the HP Turbine
Procedure :
♦ Attach measuring instrument.
♦ Check and record the alignment between the pump shaft and the turbine rotor.
3.6 Check alignment between the HP Turbine and the LP Turbine
Procedure :
♦ Attach measuring instrument.
♦ Check and record the alignment between the HP rotor and the LP rotor.
T-OH-procedure {F.K.} 24 November 2006
5. Turbine Overhauling - Scope of Work
Page 5 of 75
3.7 Check alignment between the Generator and the LP Turbine
Procedure :
♦ Attach measuring instrument.
♦ Check and record the alignment between the LP rotor and the Generator.
3.8 Check internal alignment of the LP Turbine
Procedure :
♦ Measure and record the exact values at the rear bearing pedestal measuring points (Z 22).
♦ Measure and record the exact values at the outer-casing circumferential profile measuring points.
♦ Check for full contact between the pedestal s upport brackets and the base plate (Z 85, 59, 60;
Sections F2-F2, F4-F4).
♦ Remove coupling nuts (Z 72).
♦ Remove coupling bolts.
♦ Clean coupling nuts and bolts, protect against corrosion, and store.
♦ Use lifting fixture to support weight of rotor (Z 21).
♦ Press coupling flange apart by turning in the jack screws.
♦ Push rotor in the positive direction up to 1.0mm ahead of the stop.
♦ Install support bearing, take load off of and remove the lifting fixture.
♦ Mount rear top-half bearing pedestal.
3.9 Check internal alignment of HP Turbine
Procedure :
♦ Measure and record dimension “L” (assembly data sheet) on the front support bracket seats.
♦ Measure and record the exact values at the front and center bearing pedestal m easuring points (Z
71, 1, 15).
♦ Measure and record the exact values at the outer-casing circumferential profile measuring points.
♦ Check for full contact between the rear support brackets and the base plate (Z 37, 39; Section P3-
P3).
♦ Mount the center and front top-half bearing pedestals.
♦ Disconnect the lift-oil pumps.
4.0 DISASSEMBLY :
T-OH-procedure {F.K.} 24 November 2006
6. Turbine Overhauling - Scope of Work
Page 6 of 75
4.1 HP Turbine
Open Outer Casing
Procedure :
♦ Disconnect flange joints of upper steam inlet pipes; support weight of pipes as necessary.
♦ Dismantle the upper cross-around piping, incl. swing disk valves; plug openings, store piping,
protect valves against corrosion and store.
♦ Remove and store wall temperature sensor (Z 36)
♦ Ream out (clean) taper-pin bores (Z 26, Part 14)
♦ Bring shoulder bolts into contact with the auxilia ry support brackets (Z 38, Section P1-P1, Part
30).
♦ Remove spacer bolts, washers and disk springs from the front support bracket seat (Z 38, Section
P1-P1, Parts 39-43).
♦ Insert one each additional washer between the spacer bolts and existing washers, and retighten the
spacer bolts.
♦ Loosen joints bolts as per specification.
♦ Clean and screw in guide bolts.
♦ Clean jack screws; apply lubricant to the threads; screw in.
♦ Hitch up the top-half outer casing horizontally onto the proper lifting bosses.
♦ Turn in the jack screws to uniformly lift the top half outer casing by approx. 30 mm.
♦ Lift off top-half outer casing.
Evaluation :
♦ Joint faces, guides, support brackets seat, spherical washers, L-rings.
♦ Protect top-half outer casing against corrosion and store.
♦ Protect spherical washers, spacer bolts, washers and disk springs (Z 38; Section P1-P1, Parts 39-
43) against corrosion and store.
♦ Remove upper spherical washers from the stationary blading carrier (Z 45; Section K1-K3, Part 7)
and inner seal ring (Z 37; Section K-K, Part 287); protect against corrosion and store.
♦ Remove joint bolts from the bottom-half outer casing.
Open Stationary Blade Carrier
Procedure :
♦ Sequence items 500, 525, 550 (Z 42).
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♦ Remove spot welds from the joint bolt nuts.
♦ Ream out (clean) taper-pin bores.
♦ Clean jack screws, apply lubricant to threads; screw in
♦ Hitch up top-half stationary blade carrier, thereby maintaining a horizontal position.
♦ Turn in jack screws to lift top-half by about 30mm.
♦ Lift off stationary blade carrier.
Evaluation :
♦ Joint face, blades, seal strips, spherical washers.
♦ Protect top-half stationary blade carrier against corrosion and store.
Open Inner Casing
Procedure :
♦ Remove and store pressure-instrument lines (Z 40, Part 391).
♦ Remove spot welds from the joint nut bolts.
♦ Ream out (clean) taper-pin bores.
♦ Clean and thread-in the guide bolts.
♦ Unscrew joint bolts as specified.
♦ Clean jack screws; apply lubricant to threads; screw in.
♦ Hitch up top-half inner casing, thereby maintaining a horizontal position.
♦ Turn in jack screws to lift top half by about 30mm.
♦ Lift off top-half inner casing.
♦ Remove spot welds from the joint bolts of the gland busing (Z 30).
♦ Ream out (clean) taper-pin bores.
♦ Unscrew joint bolts as specified.
♦ Lift off top-half gland bushing.
Evaluation :
♦ Joint faces, blades, seal strips, L-rings.
♦ Protect inner casing against corrosion and store.
Open Inner Gland Bushing :
Procedure :
♦ Remove spot welds from the joint bolt nuts.
♦ Ream out (clean) taper pin bores.
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♦ Unscrew joint bolts.
♦ Lift off top-half gland bushing.
Evaluation :
♦ Joint face, seal strips.
♦ Protect top-half gland bushing against corrosion and store.
Open and remove Outer Gland Bushing :
Procedure :
♦ Remove spot welds from the joint bolt nuts.
♦ Dismantle gland steam line.
♦ Unscrew joint bolts.
♦ Lift off top-half gland bushing.
♦ Swing out and lift off bottom-half gland bushing.
Evaluation :
♦ Joint face, seal strips.
♦ Protect gland bushings against corrosion and store.
Dismantle Main Oil Pump and Speed Transducer
Procedure :
♦ Detach oil lines from the main oil pump (Z 8)
♦ Remove taper pins and bolts (Z 38, Section Y1-Y1).
♦ Lift off main oil pump; remove spherical washers.
♦ Dismantle main oil pump.
Evaluation :
♦ Impeller, shaft, bearing, spherical washers.
♦ Clean all parts, protect against corrosion and store.
♦ Pull off turbine-end coupling hub (Z 10, Part 100).
♦ Dismantle speed transducer (Z9, 10, 11)
Evaluation :
♦ Coupling, governor impeller, auxiliary parts.
♦ Clean all parts, protect against corrosion and store.
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Remove Rotor
Procedure :
♦ Lift off front top-half bearing pedestal and store.
♦ Remove top-half journal bearing.
♦ Remove thrust bearing.
♦ Lift off and store rear top-half bearing pedestal.
♦ Remove top-half journal bearing.
♦ Suspend rotor horizontally at the points marked with U and Y (Z 46) and lift away.
♦ Dismantle overspeed trip device (Z 49).
Evaluation :
♦ Blades, seal strips, shaft journal, auxiliary parts, overspeed trip device.
♦ Reinstall overspeed trip device (Z 49)
♦ Protect rotor against corrosion and store.
♦ Remove bottom-half journal bearing, including the thermocouples (Z 7)
Evaluation :
♦ Journal and thrust bearings.
♦ Protect journal and thrust bearings against corrosion and store.
Remove Bottom-Half Inner Casing
Procedure :
♦ Remove thermocouples to facilitate extraction of the inner casing (Z 40).
♦ Suspend bottom-half inner casing horizontally and lift off.
Evaluation :
♦ Joint face, blades, seal strips, L-rings, guides.
♦ Protect bottom-half inner casing against corrosion and store.
♦ Remove and store bottom-half gland bushing (Z 30).
Remove Bottom-Half Stationary Blade Carrier
Procedure :
♦ Sequence : items 550, 525, 500 (Z 42).
♦ Suspend bottom-half stationary blade carrier in horizontal position and lift off.
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Evaluation :
♦ Joint face, blades, seal strips, spherical washers, guides.
♦ Protect bottom-half stationary blade carrier against corrosion and store.
♦ Remove lower spherical washers (Z 45, Section K1-K3, Part 7), protect against corrosion and
store.
Remove Bottom-Half Inner Gland Bushing
Procedure :
♦ Suspend bottom-half gland bushing in horizontal position and lift off.
Evaluation :
♦ Joint face, seal strips, spherical washers, guides.
♦ Protect bottom-half gland bushing against corrosion and store.
♦ Remove lower spherical washers (Z 37, Secti on K-K, Part 287), protect against corrosion and
store.
Remove Front Bearing Pedestal
Procedure :
♦ Dismantle piping and store.
♦ Remove spot welds from the guides (Z 38, Detail T1 and Section M1-M1).
♦ Unscrew axial guide nuts (Z 38, Detail T1); turn stud bolts (Part 60) from the outer casing;
protect stud bolts and nuts against corrosion and store.
♦ Remove lock bolts and washers from the axial gui de (Z 38, Section M1-M1), unscrew calottes
(Part 22) and remove spherical washers.
♦ Unscrew spacer bolts (Z 37, 38; Section 01-01, Part 16), remove brackets (Part 15).
♦ Suspend bearing pedestal in horizontal position and lift off.
Evaluation :
♦ Slide surfaces, spherical washers.
♦ Protect bearing pedestal against corrosion and store.
♦ Protect hardware against corrosion and store.
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Remove Center Bearing Pedestal
Procedure :
♦ Dismantle and store piping.
♦ Remove spot welds from the axial guide (Z 37, 39; Section M3-M3).
♦ Remove lock bolts and washers, unscrews calottes (Part 122) and extract spherical washers).
♦ Remove screw lock device (Z 37, 39; Section 03-03, Part 115) and loosen bolts (Part 116)
♦ Suspend bearing pedestal in horizontal position and lift off.
Evaluation :
♦ Slide surfaces, spherical washers.
♦ Protect bearing pedestal against corrosion and store.
♦ Protect hardware against corrosion and store.
Remove Axial Casing Guides :
Procedure :
♦ Remove spot welds from the guides Z 37, 38, 39; Sections W1-W1 and W3-W3).
♦ Remove lock bolts and washers; unscrew calottes; extract spherical washers.
Evaluation :
♦ Slide surfaces, spherical washers.
♦ Protect hardware against corrosion and store.
4.2 L. P. Turbine
Open Outer Casing
Procedure :
♦ Dismantle protective liners and rupture disks (Z 57)
♦ Ream out (clean) taper-pin bores (Z 50, Sections L-L and M-M)
♦ Put one each additional washer between the spacer bolts and existing washers (Z 58, 59, 60);
Sections F2-F2 and F4-F4) and tighten the spacer bolts.
♦ Unscrew joint bolts.
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♦ Clean and thread-in the assembly guides.
♦ Clean the jack screws; apply lubricant to threads; turn in jack screws.
♦ Suspend top-half outer casing horizontally from the intended lifting bosses.
♦ Turn in the jack screws to uniformly lift the top-half outer casing by about 30mm
♦ Lift off top-half outer casing.
Evaluation :
♦ Joint face, guides, spherical washers, L-rings.
♦ Protect top-half outer casing from corrosion and store.
♦ Remove upper spherical washers from the stationary blade carrier (Z 58, 59, 60) and inner casing
(Z 58, Section A-A), protect against corrosion and store.
♦ Remove joint bolts from the bottom-half outer casing.
Open Stationary Blade Carrier
Procedure :
♦ Sequence : arbitrary.
♦ Remove spot welds from the joint bolt nuts.
♦ Ream out (clean) taper-pin bores.
♦ Clean and thread-in the guide bolts.
♦ Remove joint bolts.
♦ Clean jack screws; apply lubricant to threads; screw in.
♦ Suspend top-half stationary blade carrier in a horizontal position.
♦ Turn in jack screws to lift top half by about 30 mm.
♦ Lift off top-half stationary blade carrier.
Evaluation :
♦ Joint face, blades, seal strips, spherical washers.
♦ Protect top-half stationary blade carrier against corrosion and store.
Open Inner Casing :
Procedure :
♦ Dismantle and store the pressure-instrument lines (Z 58, Part 391)
♦ Remove spot welds from the joint bolt nuts.
♦ Ream out (clean) taper-pin bores.
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♦ Clean and thread-in guide bolts.
♦ Remove joint bolts.
♦ Clean jack screws; apply lubricant to the threads; screw in.
♦ Suspend top-half inner casing in a horizontal position.
♦ Turn in jack screws to lift the top-half by about 30 mm
♦ Lift off top-half inner casing.
Evaluation :
♦ Joint face, blades, seal strips, L-rings.
♦ Protect top-half inner casing against corrosion and store.
Open and remove Gland Bushings :
Procedure :
♦ Remove spot welds from the joint bolt nuts.
♦ Dismantle gland-steam line.
♦ Unscrew joint bolts.
♦ Lift off top-half gland bushing.
♦ Swing out and lift off bottom-half gland bushing.
Evaluation :
♦ Joint faces, seal strips.
♦ Protect gland bushings against corrosion and store.
Remove Rotor
Procedure :
♦ Lift off and store rear top-half bearing pedestal.
♦ Remove top-half rear journal bearing.
♦ Suspend rotor in the vicinity of the coupling flanges (Z 65) and raise in a horizontal position.
Evaluation :
♦ Blades, seal strips, shaft journal.
♦ Protect rotor against corrosion and store.
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♦ Remove bottom-half journal bearing, including thermocouples (Z 7).
Evaluation :
♦ Journal bearing.
♦ Protect journal bearing against corrosion and stores.
Remove Bottom Half Inner Casing
Procedure :
♦ Suspend bottom-half inner casing in horizontal position and lift-off.
Evaluation :
♦ Joint faces, blades, seal strips, spherical washers, L-rings, guides.
♦ Protect bottom-half inner casing against corrosion and store.
♦ Remove lower spherical washers (Z 58, Section A-A), protect against corrosion and store.
Remove Bottom-Half Stationary Blade Carrier
Procedure :
♦ Sequence : arbitrary.
♦ Suspend bottom-half stationary blade carrier in a horizontal position and lift-off.
Evaluation :
♦ Joint faces, blades, seal strips, spherical washers, guides.
♦ Protect bottom-half stationary blade carrier against corrosion and store.
♦ Remove lower spherical washers (Z 58, 59, 60), protect against corrosion and store.
4.3 Valve Blocks :
Dismantle Emergency Stop Valves
Procedure :
♦ Oil side :
♦ Remove lift indicator
♦ Remove and store ESV piping.
♦ Unscrew nuts of the bolts connecting the oil side and steam side; uniform ly loosen the
tension-rod nuts, thereby relaxing the springs.
♦ Remove oil-side assembly (Z 78, Part 2), in cl. spring and spring retaining plate; rem ove
spring retaining plate, springs and piston (Part 13).
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♦ Unscrew stem connection, remove piston plate (Part 12).
♦ Remove cover and extract actuation piston (Part 14).
Evaluation :
♦ All dismantled parts, body.
♦ Clean all parts and protect against corrosion.
♦ Steam Side :
♦ Unscrew nuts on the mating flange and remove valve (Part 1)
♦ Remove valve seat (Part 10).
♦ Remove valve stem (Part 30) and valve cone (Part 11).
Evaluation :
♦ All dismantled parts, body.
♦ Clean all parts and protect against corrosion.
Dismantle Control Valve
Procedure :
♦ Check identification markings on all parts.
♦ Remove valve-lift monitor (Z 80).
♦ Remove and store complete control cylinder (Z 87).
♦ Remove lever (Part 46).
♦ Relax compression springs (Part 36) by unscrewing the top nuts (Part 40).
♦ Remove compression springs and the top and bottom springs retaining plates.
♦ Remove the taper pins (Part 19) and extract the drive rod.
♦ Remove stud bolt (Part 59); turn out set screws (Parts 31, 32, 33).
♦ Remove radiation shield.
♦ Unscrew nuts on valve cover; remove valve cover, incl. valve stem.
♦ Remove valve cone.
Evaluation :
♦ All dismantled parts, valve block, valve seats.
♦ Clean all parts and protect against corrosion.
4.4 Lube Oil System :
Check Lube Oil System
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Procedure :
♦ Drain all operating oil out of the oil tank (4310), suction oil tank (4320), oil cooler (4400) and oil
filter (4510).
♦ Detach and dismantle auxiliary oil pumps (4220, 4230) and emergency oil pumps (4240).
Evaluation :
♦ Impellers, bearing, seal faces, couplings, electric motors.
♦ Reassemble oil pumps and reinstall in oil tank.
Procedure :
♦ Detach and dismantle oil vapor exhauster (4340)
Evaluation :
♦ Impeller, bearing, coupling, electric motor.
♦ Reassemble oil vapor exhauster and reinstall on the oil tank.
Procedure :
♦ Remove inlet strainer from oil tank (4310) and clean.
♦ Clean interior of oil tank.
♦ Reinstall inlet strainer and close drain valve.
♦ Remove, inspect and clean suction-line foot valve.
♦ Clean interior of suction oil tank (4320).
♦ Reinstall valve and close drain valve.
♦ Detach and dismantle lift-oil pumps (4710)
Evaluation :
♦ Gear wheels, bearings, seal faces, couplings, electric motors.
♦ Reassemble and reinstall oil pumps.
Procedure :
♦ Remove, inspect and clean tube bundles in the oil coolers (4400)
♦ Inspect and clean water channels and return boxes.
♦ Reassemble oil cooler.
♦ Dismantle, inspect and reinstall dual three way rotary valve.
♦ Remove and clean filter cartridges in the duplex oil filter (4510), lifting sy stem (4730) and fine-
filtration system (4830).
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♦ Drain rest of oil out of filter shell; clean shell.
♦ Reinstall filter cartridges.
♦ Detach and dismantle oil pumps from the fine-filtration system (4810, 4812).
Evaluation :
♦ Impellers, bearings, seal faces, couplings, electric motors.
♦ Reassemble and reinstall oil pumps.
Procedure :
♦ Fill with clean operating oil.
5.0 NON-DESTRUCTIVE TESTING
5.1 Non-Destructive Inspection :
Test Procedure Test
S# Object Material Remarks
VT MT PT UT Result
1. HP-Rotor 28CrMoNiV49
2. LP-Rotor 26NiCrMoV85
3. LP-Rotor blades X20Cr13
stage 5 +6 left and right
4. Thrust / journal bearing ST52-3N /
Tegostar 738
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5. HP-outer casing-upper part GS-17CrMo55
6. Valve block casing B GS-17CrMoV511
7. HP Joint flange bolts 21CrMoV57 /
24CrMo5
8. HP-inner casing GS-17CrMoV511
9. HP piping GS-17CrMoV511
/14MoV63
10. 4 diffuser studs St52.3 N
11. Main steam inlet GS-17CrMoV511 with
Baroscopic
VT-Visual Testing, MT-Magnetic Testing, PT-Penetrate Testing, UT-Ultrasonic Testing
5.2 Replica Tests :
S# Part Material Position Remarks
1. HP – Piping Main steam inlet / 14MoV63 / Weld seam
elbow GS-17CrMoV511
2. Elbow – outer fiber 14MoV63
3. Elbow – inner fiber 14MoV63
4. HP – Piping, main steam inlet / GS-17CrMoV511
elbow
5. HP – Piping GS-17CrMoV511 /
Elbow / pipe 14MoV63
6. Elbow – outer fiber GS-17CrMoV511
7. Elbow – inner fiber GS-17CrMoV511
8. HP – piping main steam 14MoV63 /
flange / elbow GS-17CrMoV511
9. HP – piping main steam inlet / GS-17CrMoV511 /
pipe 14MoV63
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10. HP – pipe, elbow / pipe GS-17CrMoV511 /
14MoV63
11. Elbow – inner fiber GS-17CrMoV511
12. Elbow – outer fiber GS-17CrMoV511
13. HP Piping 14MoV63 /
Pipe / Elbow GS-17CrMoV511
14. Valve Block B GS-17CrMoV511 /
HP Stop Valve / pipe 14MoV63
15. Valve block B GS-17CrMoV511
HP Stop valve / Control valve
16. Valve Block B GS-17CrMoV511
Control Valve
5.3 Surface Cracks Tests :
S# Method
Part Material Remarks
MPT DPT
1. Journal Bearing / thrust ST52-3N/ White Metal
bearing TEGOSTAR 738
2. LP Rotor 26NiCrMoV85 All transition radius including A-Wheel.
Blades : Stage 5 & 6 left and right
3. H. P. Rotor 28CrMoNiV49 All transition radius including A-Wheel
4. HP Inner Casing GS-17CrMoV511 Complete
Upper and Lower Part
5. HP Piping 14MoV63 / Weld seams & elbows
GS-17CrMo511
6. HP Joint flange bolts 24CrMo5 / All
21CrMoV57
7. HP Outer Casing GS-17CrMo55 Cross section crossings at inner surface.
Upper part
8. Valve Casing Block B GS-17CrMoV511 Cross Section
Crossing Outside
9. Diffuser Studs ST52.3N All
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5.4 Elbows wall thickness measurement :
o
90
STEEL ELBOWS (14MoV63)
Thickness as per drawing – 8.8 mm o
45
Elbow nos. 5, 6, 11 at position 0O, 45 O, 90 O
o
0
INNER FIBER, OUTER FIBER, NEUTRAL FIBER.
CAST STEEL ELBOWS (GS-17CrMoV511)
Thickness as per drawing – 27 mm
Elbow nos. : 1, 2, 3, 4, 7, 8, 9, 10, 12, 13, 14, 15 at positions 0O, 45 O, 90 O
Inner fiber, outer fiber, neutral fiber.
5.5 Boroscopy of Steam Inlet Pipes and emergency stop valves
and control valves internal area.
5.6 Wall Thickness Measurement :
6.0 FACT FINDING :
6.1 Components, Parts and Individual areas to be inspected :
6.1.1 HP Turbine
The following individual parts and areas require inspection :
6.1.1.1 Rotor
♦ A-Wheel blading.
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♦ Moving blades of the first and second expansion lines.
♦ Seal strips : shaft, balancing piston, moving blades.
♦ Bearing journals, front and rear.
♦ Rotor face in the vicinity of bearing oil wiper rings, blading and admission.
♦ Coupling half section, generator end.
♦ Vicinity of mechanical and hydraulic shaft turning gear.
♦ Overspeed trip bolt.
6.1.1.2 Inner Casing :
6.1.1.2.1 Inner Casing, Top Section :
FROM OUTSIDE :
♦ L-Ring grooves, main steam and overload.
♦ Nut support face.
♦ Cast casing.
FROM WITHIN :
♦ Steam admission channels, m ain steam plus overload, upto
stationary blading.
♦ Nozzle blades.
♦ Stationary blades.
♦ Seal strips between stationary blades.
♦ Casing face between stationary blades.
♦ Joint face.
♦ Seal strips of gland bushing (Diaphragm / labyrinth seal).
6.1.1.2.2 Inner Casing, Bottom Section :
FROM OUTSIDE :
♦ L-Ring grooves, main steam plus overload.
♦ Nut support face.
♦ Parts comprising lateral palm support and lower axial guide.
♦ Cast casing.
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FROM WITHIN :
♦ Steam admission channels, m ain steam plus overload, upto
stationary blading.
♦ Nozzle blades.
♦ Seal strips between stationary blades.
♦ Casing face between stationary blades.
♦ Joint face.
♦ Seal strips of gland busing (diaphragm, labyrinth seal).
6.1.1.3 Stationary Blade Carrier-I :
6.1.1.3.1 Stationary Blade Carrier-I - Top Section :
FROM OUTSIDE :
♦ Guide groove.
♦ Cast casing.
♦ Nut support face.
FROM WITHIN :
♦ Joint face.
♦ Stationary blades.
♦ Seal strips.
♦ Casing face between stationary blades.
6.1.1.3.2 Stationary Blade Carrier-I - Bottom Section :
FROM OUTSIDE :
♦ Guide groove.
♦ Cast casing.
♦ Nut support face.
FROM WITHIN :
♦ Joint face.
♦ Stationary blades.
♦ Seal strips.
♦ Casing face between stationary blades.
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6.1.1.4 Stationary Blade Carrier-II :
6.1.1.4.1 Stationary Blade Carrier-II - Top Section :
FROM OUTSIDE :
♦ Guide groove.
♦ Cast casing.
♦ Nut support face.
FROM WITHIN :
♦ Joint face.
♦ Stationary blades.
♦ Seal strips.
♦ Casing face between stationary blades.
6.1.1.4.2 Stationary Blade Carrier-II - Bottom Section :
FROM OUTSIDE :
♦ Guide groove.
♦ Cast casing.
♦ Nut support face.
FROM WITHIN :
♦ Joint face.
♦ Stationary blades.
♦ Seal strips.
♦ Casing face between stationary blades.
6.1.1.5 Stationary Blade Carrier-III :
6.1.1.5.1 Stationary Blade Carrier-III - Top Section :
FROM OUTSIDE :
♦ Guide groove.
♦ Cast casing.
♦ Nut support face.
FROM WITHIN :
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♦ Joint face.
♦ Stationary blades.
♦ Seal strips.
♦ Casing face between stationary blades.
6.1.1.5.2 Stationary Blade Carrier-III - Bottom Section :
FROM OUTSIDE :
♦ Guide groove.
♦ Cast casing.
♦ Nut support face.
FROM WITHIN :
♦ Joint face.
♦ Stationary blades.
♦ Seal strips.
♦ Casing face between stationary blades.
6.1.1.6 HP Outer Casing :
6.1.1.6.1 HP Outer Casing - Top Section :
FROM OUTSIDE :
♦ Nut support face.
FROM WITHIN :
♦ L-ring grooves, main steam plus overload.
♦ Joint face.
♦ Guide faces for stationary blade carriers, I, II and III, plus
balancing piston.
♦ Seal strips; shaft, front; balancing piston; shaft, read.
6.1.1.6.2 HP Outer Casing – Bottom Section :
♦ Joint face.
♦ Seal strips : shaft, front balancing piston, rear.
♦ Eccentric bushings, anti-rotation pin, seal covers for balancing
piston, inner casing, stationary blade carriers I, II, III.
6.1.2 LP Turbine
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The following individual parts and areas require inspection :
6.1.2.1 Rotor
♦ Moving blades.
♦ Seal strips between the blade rows and around the shaft seals.
♦ Balancing weights.
♦ Rotor face (in the steam section and in the area of the bearing oil wiper rings).
♦ Bearing journals.
♦ TE and GE coupling half sections.
♦ Couplings bolts and nuts.
6.1.2.2 LP Inner Casing :
6.1.2.2.1 LP Inner Casing - Top Section :
FROM OUTSIDE :
♦ Nut support face.
♦ Casing finish.
FROM WITHIN :
♦ Joint face.
♦ Casing finish.
♦ Stationary blades.
♦ Seal strips.
6.1.2.2.2 LP Inner Casing - Bottom Section :
♦ Joint face.
♦ Stationary blades.
♦ Seal strips.
♦ Casing finish.
♦ Lateral and axial guide.
6.1.2.3 LP Stationary Blade Carrier :
6.1.2.3.1 LP Stationary Blade Carrier - Top Section :
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FROM OUTSIDE :
♦ Guide faces, front / rear.
♦ Casing finish.
FROM WITHIN :
♦ Stationary blades.
♦ Casing finish up to diffuser outlet.
6.1.2.3.2 LP Stationary Blade Carrier - Bottom Section :
FROM OUTSIDE :
♦ Guide faces, front / rear.
♦ Casing finish.
FROM WITHIN :
♦ Stationary blades.
♦ Casing finish up to diffuser outlet.
♦ Lateral support and axial guide.
6.1.2.4 LP Outer Casing
6.1.2.4.1 LP Outer Casing - Top Section :
♦ Flange connection, admission.
♦ Rupture disk.
♦ Interior finish.
♦ Guide faces for stationary blade carrier.
♦ Seal strips, front and rear shaft seals.
♦ Casing finish between shaft seal strips.
6.1.2.4.2 LP Outer Casing - Bottom Section :
♦ Flange connection, admission.
♦ Rupture disk.
♦ Interior finish.
♦ Guide faces for stationary blade carrier.
♦ Seal strips, front and rear shaft seals.
♦ Casing finish between shaft seal strips.
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♦ Eccentric bushings and anti-rotation pin of the axial guide for
the inner casing and stationary blade carrier.
6.1.3 Journal and Thrust Bearings
The following components, parts and individual areas must be inspected :
6.1.3.1 HP Journal Bearing
6.1.3.1.1 HP Journal Bearing – Top-half Shell ;
♦ Babbitt lining.
♦ Spherical area of bearing shell.
6.1.3.1.2 HP Journal Bearing – Bottom-half Shell ;
♦ Babbitt lining.
♦ Spherical area of bearing shell.
6.1.3.2 LP Journal Bearing
6.1.3.2.1 LP Journal Bearing – Top-half Shell ;
♦ Babbitt lining.
♦ Spherical area of bearing shell.
6.1.3.2.2 LP Journal Bearing – Bottom-half Shell ;
♦ Babbitt lining.
♦ Spherical area of bearing shell.
6.1.3.3 Thrust Bearing
6.1.3.3.1 Thrust Bearing – Top-half Shell ;
♦ Babbitt lining of thrust bearing segments.
♦ Bearing body of top-half shell.
6.1.3.3.2 Thrust Bearing – Bottom-half Shell ;
♦ Babbitt lining of thrust bearing segments.
♦ Bearing body of top-half shell.
6.1.4 Bearing Pedestal
The following components, parts and individual areas must be inspected :
6.1.4.1 Front HP Bearing Pedestal
6.1.4.1.1 Front HP Top-half Bearing Pedestal
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♦ Bearing oil wiper ring seal strips.
♦ Joint plane of top-half bearing pedestal.
♦ Inside surface of top-half bearing pedestal.
6.1.4.1.2 Front HP Bottom-half Bearing Pedestal
♦ Bearing oil wiper ring seal strips.
♦ Joint plane of bottom-half bearing pedestal.
♦ Inside surface of bottom-half bearing pedestal.
6.1.4.2 Rear HP Bearing Pedestal
6.1.4.2.1 Rear HP Top-half Bearing Pedestal
♦ Bearing oil wiper ring seal strips.
♦ Joint plane of top-half bearing pedestal.
♦ Inside surface of top-half bearing pedestal.
6.1.4.2.2 Rear HP Bottom-half Bearing Pedestal
♦ Bearing oil wiper ring seal strips.
♦ Joint plane of bottom-half bearing pedestal.
♦ Inside surface of bottom-half bearing pedestal.
6.1.4.3 Rear LP Bearing Pedestal
6.1.4.3.1 Rear LP Top-half Bearing Pedestal
♦ Bearing oil wiper ring seal strips.
♦ Joint plane of top-half bearing pedestal.
♦ Inside surface of top-half bearing pedestal.
6.1.4.3.2 Rear LP Bottom-half Bearing Pedestal
♦ Bearing oil wiper ring seal strips.
♦ Joint plane of bottom-half bearing pedestal.
♦ Inside surface of bottom-half bearing pedestal.
6.1.5 Valve Blocks
The following components, parts and individual areas must be inspected :
6.1.5.1 Emergency Stop Valve
6.1.5.1.1 Emergency Stop Valves, Steam-side Insert
♦ Valve stem.
♦ Valve cone.
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♦ Valve stem bushing.
♦ Valve cone bushing.
6.1.5.2.1 Emergency Stop Valves, Drive-end
♦ Piston rod.
♦ Piston plate.
♦ Piston.
♦ Spiral springs.
♦ Piston rod guide sleeve.
6.1.5.2.3 Steam Strainers
♦ Steam strainer coiling strip.
♦ Steam strainer basket.
♦ Steam strainer body.
6.1.5.2 Control Valve
6.1.5.2.1 Control Valves, Steam-side Insert
♦ Valve stem.
♦ Valve cone.
♦ Valve stem bushing.
♦ Valve cone bushing.
6.1.5.2.2 Control Valves, Drive end
♦ Bars.
♦ Compression springs.
♦ Leverbar mount.
♦ Parts of control cylinder.
6.1.5.2.3 Valve Block Body
♦ Valve seats “emergency stop and control valve”
♦ Inside face of valve block.
♦ Stud bolts on valve block.
6.2 Component / Part Findings Checklist :
Blading :
♦ A-Wheel / C-Wheel blades.
♦ Stationary / moving blades.
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♦ Deposits ?
♦ Scoring ?
♦ Abrasion ?
♦ Seat mobility ?
♦ Deformation ?
♦ Incipient cracking ?
♦ Fractures ?
♦ Leak-tightness ?
Coupling bolt :
♦ Scoring ?
♦ Frictional oxidation ?
Balancing weights :
♦ Fit in mounting groove ?
♦ Droplet-impact erosion ?
Flanged connections :
♦ Functionability impaired ?
♦ Deformation ?
♦ Leak-tightness ?
♦ Damage ?
Rupture disk :
♦ Damage ?
Bolts :
♦ Fractures ?
♦ Incipient cracking ?
♦ Relaxation ?
Babbitt lining :
♦ Visual damage to surface ?
♦ Damage to babbit lining determ ined via surf ace crack exam ination according to the liquid-
penetrant method ?
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♦ Unacceptable large areas without adequate bond between the lining and the bearing body ,
determined via ultrasonic testing ?
♦ Functionability impaired due to :
• Unacceptable bearing contact angle ?
• Unacceptable lateral or top clearance ?
Bearing shell :
♦ Quality of finish ?
Pedestal faces :
♦ Corrosion ?
♦ Damaged ?
Valve stem :
♦ Quality of finish ?
♦ Damage ?
♦ Functionability impaired ?
Guide sleeves / bushings :
♦ Quality of guide bore finish ?
♦ Damage ?
♦ Functionability impaired ?
Piston rod :
♦ Quality of finish ?
♦ Damage ?
♦ Functionability impaired ?
Piston :
♦ Quality of finish ?
♦ Damage ?
♦ Functionability impaired ?
Spiral springs :
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♦ Quality of finish ?
♦ Damage ?
♦ Functionability impaired ?
Steam strainer coiling strip :
♦ Damage ?
♦ Foreign objects ?
Steam strainer basket :
♦ Damage ?
Steam strainer body :
♦ Damage ?
♦ Steam strainer support ?
Bars :
♦ Functionability impaired ?
Leverbar mount :
♦ Functionability impaired ?
Control cylinder assembly :
♦ Functionability impaired ?
Valve seat ?
♦ Quality of finish ?
♦ Damage ?
♦ Functionability impaired ?
6.3 List of Fact-finding tools, instruments and accessories :
“How-to” Guide for inspection, measuring, testing.
How to inspect ?
Visual Inspection :
Typical accessories :
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♦ Flashlight (halogen lamp).
♦ Photoflood.
♦ Magnifying glass (5 – 10 x)
♦ Mirrors (with and without illumination).
♦ Endoscope (rigid or flexible).
Visual / Manual Inspection :
Typical accessories :
♦ Hand-hammer (200 – 300 gr)
♦ Screwdrivers (approx. 300mm long)
How to Measure ?
Manual measuring :
Typical accessories (measuring tools) :
♦ Tape measure (fabric or metal).
♦ Vernier and / or dial calipers.
♦ Feeler gages.
♦ Micrometers.
♦ Micrometer calipers.
♦ Depth gages.
♦ RC generators.
How to Test ?
Manual testing :
♦ Liquid Penetrant Test.
♦ Magnetic Particle Test.
♦ Ultrasonic Examination.
♦ Electric Crack-Depth Measurements.
♦ X-Ray Examination.
Typical accessories (test instruments / agents) :
♦ Cleaning agents.
♦ Liquid penetrant.
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♦ Developer.
♦ UV lamp.
♦ Yoke Magnet.
♦ Coil Magnet (fluorescent or black magnetic powder carrier fluid).
♦ Pulse-echo test instruments (transducers / sensors of various size).
♦ Potential Probe.
6.4 List of Potential Findings :
Blades
Blades Tips
♦ In order.
♦ Radial rubbing.
♦ Radial rubbing, scoring.
♦ Axial rubbing.
♦ Axial rubbing, scoring.
♦ Radial rubbing, scoring and measurable gap.
♦ Crevice corrosion.
♦ Fused-on foreign particles under shrouding.
♦ Broken rivet head.
♦ Broken rivet shank.
Vane
♦ Broken vane.
♦ Cracked vane.
♦ Axial rubbing on :
• Leading edge.
• Trailing edge
♦ Foreign object damage :
• Roughened - leading edge.
• Dented - trailing edge
• Notched - convex side.
• Torn - concave side
♦ Coatings (scale, deposit) :
• where ? - convex side, concave side.
• extent ? - thin, thick.
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• color ? - rusty brown, grayish white.
• adhesion ? - adherent, easily, removable, water soluble.
• chem.. analysis- completed ? by whom ? corrosive constituents ?
♦ Pitting :
• On the convex side.
• On the concave side.
♦ Solid particle erosion :
• Leading edge, convex side.
• Leading edge, concave side.
• Trailing edge.
Blade Root
♦ Ring test in order (pure, clear sound).
♦ Ring test indicating loose fit (clanking sound).
♦ Measurable gap formation between 2 blades.
♦ Locking / end blade risen more than permissible (0.3 mm).
♦ Broken blade root.
♦ Cracked blade root.
Seal Strips
♦ Broken off around the entire circum ference above caulking groove; broken
out in part (%).
Note : Rectangular fractures indicate stress corrosion.
Curved fractures indicate vibration as the cause of cracking.
♦ Bent due to foreign-object impact.
♦ Wavy deformation (rippling) due to radial rubbing
♦ Bent forward due to axial rubbing.
♦ Bent backward due to axial rubbing.
♦ Unacceptable abrasion due to radial rubbing.
♦ Perceptible burring.
♦ Residual strip height (measured).
♦ Scale formation : in which area….?.
♦ Scaly strips susceptible to brutal fracture.
♦ Elastic seal strips.
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Bearing Journals
♦ In order.
♦ Shallow scoring.
♦ Random scoring along the journal length.
♦ Scoring at the journal ends.
♦ Individual gouges (depth ?).
Thrust Bearing Collar
♦ In order
♦ Shallow scoring, randomly distributed around annulus.
♦ Pronounced scoring on the collar side accom modating residual axial thrust
in positive direction (in negative direction).
♦ Deep individual gouges in the positive collar (in the negative collar).
♦ Thrust bearing collars located in parallel.
♦ Collar faces located in a conical attitude to each other (m echanical repair
work necessary).
Rotor Faces
♦ In order.
♦ Scaled.
♦ Corroded.
♦ Eroded.
♦ Covered with deposits.
♦ Rub marks.
♦ Striated.
♦ Cracked (crack depth ?)
Coupling Half Section
♦ In order
♦ Frictional oxidation.
♦ Fretting corrosion.
♦ Scoring.
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♦ Concave deformation of face area.
♦ Anti-rotation pins sheared off.
L-ring Grooves
♦ In order.
♦ Scaled.
♦ Oval deformation.
♦ Scoring.
Nut Support Faces
♦ In order.
♦ Deep galling.
Cast Casing
♦ In order.
♦ Torn.
♦ Covered with deposits.
♦ Corroded.
♦ Eroded.
♦ Corrosion-erosion attach.
♦ Washed-out casting pores.
♦ Washed-out casting cavities.
♦ Oval deformation.
Nozzle Blades
♦ In order.
♦ Solid particle erosion.
♦ Scaling.
♦ Foreign particle hammering.
♦ Torn seal welds.
♦ Loose nozzle-blade seat.
Joint Faces
♦ In order.
♦ Scaling.
♦ Signs of steam leakage without material erosion.
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♦ Signs of steam leakage with material erosion.
♦ Deformation.
Structural Elements :
“Thermo-elastic Housing Guide”
♦ In order.
♦ Unimpeded movement.
♦ Binding movement.
♦ Seized.
♦ Scaled.
♦ Torn.
♦ Deformed.
♦ Hammered.
♦ Fretting corrosion.
♦ Striated.
♦ Abrasion.
Coupling Bolt
♦ In order.
♦ Fretting corrosion.
♦ Scored from dismantling.
♦ Unacceptable stretch.
Balancing Weights
♦ In order.
♦ Droplet-impact erosion.
♦ Loose fit in mounting groove.
Flanged Connections
♦ In order.
♦ Concave deformation of face area.
♦ Leaky.
♦ Steam erosion marks without material abrasion.
♦ Steam erosion marks with material abrasion.
♦ Torn.
♦ Contact face for seal grooved indented.
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Rupture
♦ In order.
♦ Damaged
Bolts
♦ In order.
♦ Torn.
♦ Broken off.
♦ Unacceptable stretch.
♦ Scaled thread flanks.
♦ Galled.
Babbitt Lining
♦ In order.
♦ Colored oil deposits.
♦ Full-width scoring.
♦ Scoring at front and rear.
♦ Scoring in the vicinity of lift-oil pressure relief hole.
♦ Round foreign objects stuck in Babbitt metal.
♦ Isolated wide / deep scoring.
♦ Cavitations at front of out-let side oil groove.
♦ Smearing.
♦ Babbitt fretting.
♦ Surface pores.
♦ Crack in Babbitt lining.
♦ Bond in order.
♦ Unacceptably large areas without adequate bond between the Babbitt lining
and the bearing body.
♦ Bearing contact angle in order.
♦ Bearing contact angle too wide.
♦ Clearances in order.
♦ Lateral or top clearance too small or too large.
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Bearing Shell
♦ In order.
♦ Spherical area damaged by frictional oxidation.
♦ Spherical area dispels evidence of hammering due to bearing vibration.
♦ Evidence of hammering on the pedestal guide faces.
Pedestal Faces
♦ In order.
♦ Rusty.
Valve Stems
♦ In order.
♦ Scaling.
♦ Axial scoring.
♦ Gland corrosion.
♦ Radial vibration marks.
♦ Torn at cone.
♦ Surface cracks in the hard-facing.
♦ Torn in the spindle.
♦ Torn at the coupling.
♦ Unacceptable bending.
Valve Cones
♦ In order.
♦ Foreign objects pressed into valve seat.
♦ Valve seat torn.
♦ Valve broken.
♦ Valve blow out.
♦ Back seal blown out.
♦ Taper shank scored.
♦ Hard-facing torn at taper shank.
♦ Taper shank scaled.
♦ Pilot cone leaky.
♦ Pilot cone seized.
♦ Signs of hammering on the anti-rotation device.
♦ Anti-rotation device in order.
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♦ Anti-rotation device worn.
Guide Sleeves / Bushings
♦ In order.
♦ Scored.
♦ Beaten out on one side.
♦ Back seal indented.
♦ Back seal blown out.
♦ Clearance too large or too small.
Piston Rod
♦ In order.
♦ Scored.
♦ Bent.
♦ Torn.
Piston Plate
♦ In order.
♦ Damaged seal face.
♦ Torn seal face.
♦ Corroded.
Piston
♦ In order.
♦ Damaged seal face.
♦ Corroded.
Spiral Springs
♦ In order
♦ Corroded.
♦ Broken.
Steam Strainer Coiling Strip
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♦ In order.
♦ Torn
♦ Noticed
♦ Round foreign objects stuck in coiling strip.
♦ Signs of hammering.
♦ Broken out.
Steam Strainer Basket
♦ In order.
♦ Torn
♦ Bent guide pins.
Steam Strainer Body
♦ In order.
♦ Damaged.
Bars
♦ In order.
♦ Bent.
Lever mount
♦ In order.
♦ Mount beater out.
Control Cylinder Assembly
♦ In order
Valve seat
♦ In order.
♦ Cracked.
♦ Broken.
♦ Indented by foreign objects.
♦ Blown out.
♦ Torn weld.
7.0 RE-ASSEMBLY :
7.1 L. P. Turbine :
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Prepare Bottom-Half Outer Casing for Reassembly
Procedure :
♦ Remove fitted parallel keys from the front and rear axial casing guides (Z58, 59, 60; Detail Z2, Z4)
♦ Inspect fitted parallel keys and contact faces.
♦ Coat fitted parallel keys with lubricant and install.
♦ Check and record clearances (Z 58, 59, 60; Details Z2, Z4, Section G-G)
Prepare Rear Bearing Pedestal for Reassembly
Procedure :
♦ Install bottom-half bearing; protect journal surface areas.
Insert Rotor
Procedure :
♦ Suspend rotor in the vicinity of the coupling flanges (Z 65) and raise slightly.
♦ Clean rotor and protect against corrosion.
♦ Set down rotor in the support bearing at front and bearing pedestal at rear, thereby ensuring that the
journal surface areas of both bearings are coated with viscous oil.
♦ Install top-half journal bearing.
Replace Top-Half Outer Casing
Procedure :
♦ Suspend top-half outer casing in a horizontal position from the intended lifting bosses and raise
slightly.
♦ Clean top-half outer casing and protect against corrosion.
♦ Install guide bolt in the bottom-half outer casing.
♦ Degrease top-half in the bottom-half outer casing.
♦ Apply uniform layer of bluing ink to the joint face of the top-half outer casing.
♦ Install top-half outer casing on bottom-half outer casing and tighten several joint bolts.
Align Bearing Pedestal and Outer Casing
Procedure :
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♦ Unscrew spacer bolts (Z 58, 59, 60; Section F2-F2, F4-F4) on the bottom -half outer
casing.
♦ Check for full contact between the support brackets and the base plates (Z 58, 59, 60;
Section F2-F2, F4-F4).
♦ Check for full contact between the bearing pede stal and the base plate (Z 58, 60; Section
N4-N4).
♦ Check alignm ent dim ensions (Assem bly data sheet EI, EII) or ascertain via rotor
displacement and record values.
♦ Measure and record the exact values at the outer-casing circumferential profile measuring
points.
♦ Measure and record the exact values at the rear bearing pedestal measuring points.
♦ Record measured values and correct as necessary by way of rotor displacement.
♦ Tighten spacer bolts (Z 58, 59, 69, Section F2-F2, F4-F4)
Remove Top-Half Outer Casing
Procedure :
♦ Unscrew joint bolts.
♦ Remove and store top-half outer casing.
♦ Evaluate bluing imprint.
Install Outer Gland Bushing for clearance Check
Procedure :
♦ Measure and evaluate the exact values at the out er-casing circumferential profile measuring points
and correct as necessary via rotor displacement.
♦ Clean front and rear gland bushings and protect against corrosion.
♦ Apply lubricant to guides.
♦ Swing in front and rear bottom-half gland bushings.
♦ Measure, evaluate and record the horizontal a nd vertical radial clearances between the gland
bushings and the rotor.
♦ Measure, evaluate and record axial movement of rotor in the rear gland bushing.
♦ Remove and store front bottom-half gland bushing.
♦ Measure, evaluate and record axial movement of rotor in the rear gland bushing.
♦ Remove and store rear bottom-half gland bushing.
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Remove Rotor
Procedure :
♦ Remove top-half journal bearing.
♦ Remove and store rotor.
♦ Protect bottom-half journal bearing and support bearing against damage.
Install and Align Stationary Blade Carrier
Procedure :
♦ Sequence : items 500, 525.
♦ Suspend bottom-half stationary blade carrier in a horizontal position and raise slightly.
♦ Clean bottom-half stationary blade carrier and protect against corrosion.
♦ Coat stationary blade carrier guides with lubricant.
♦ Coat the contact faces of the calottes (Z 58, 59, 60; Sections C2-C2, C4-C4); position m arked
spherical washers (Parts 507, 532) in the bottom-half outer casing.
♦ Install bottom-half stationary blade carrier, thereby ensuring that the spherical washers are properly
seated.
♦ Insert rotor.
♦ Check alignment dimension (Assembly data sheet EI, EII) or ascertain via rotor displacement.
♦ Measure and evaluate the exact values of the outer-casing circumferential profile measuring points
and correct as necessary via rotor displacement.
♦ Measure and evaluate the lateral (horizontal) radi al clearance between the stationary blade carriers
and the rotor and correct as necessary via the adjusting elements (Z 58, 59, 60; Section C2-C2, C4-
C4).
♦ Suspend top-half stationary blade carrier in a horizontal position and raise slightly.
♦ Clean top-half stationary blade carrier and protect against corrosion.
♦ Screw guide bolts into bottom-half stationary blade carrier.
♦ Degrease the joint faces on the top and bottom halves.
♦ Place top-half stationary blade carrier in position and tighten several joint bolts.
♦ With the aid of the adjusting elem ents (Z 58, 59, 60; Section C2-C2, C4-C4), vertically
raise and lower the stationary blade carrier in position in order to determ ine the overall
radial clearance between the stationary blade carrier and the rotor; evaluate; center the
stationary blade carrier and record the values.
♦ Apply lubricant to the contact faces of the top calottes (Z 58, 59, 60; Section C2-C2, C4-C4) and
apply marked spherical washers.
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♦ Set up proper clearance between the spherical w ashers and the outer casing; secure adjusting
elements as specified in the drawing; check and record all values.
♦ Remove spherical washers and keep ready for further reassembly.
♦ Measure, evaluate and record axial movement of the rotor.
♦ Unscrew joint bolts.
♦ Raise top-half stationary blade carrier, protect against corrosion and store.
♦ Check and record the lateral (horizontal) radial clearance between the stationary blade carriers and
the rotor.
♦ Measure, evaluate and record the axial clearance between the rotating and stationary blades in
positive and negative direction.
♦ Remove top-half journal bearing.
♦ Remove and store rotor.
♦ Check bottom-half journal bearing and support bearing for damage.
Install and align Inner Casing
Procedure :
♦ Suspend bottom-half inner casing in horizontal position and raise slightly.
♦ Clean bottom-half inner casing and protect against corrosion.
♦ Apply lubricant to inner casing guides.
♦ Apply lubricant to contact faces of bottom calottes (Z 58, 59, 60; Section A-A); position the
marked spherical washers (Part 325) in the bottom-half outer casing.
♦ Determine the horizontal L-ring movement in the outer casing.
♦ Install bottom-half inner casing, thereby ensuring that the spherical washers are properly seated.
♦ Insert rotor.
♦ Check alignment dimensions (assembly data sheet EI. EII) or ascertain via rotor displacement.
♦ Measure and evaluate the exact values at the out er-casing circumferential profile measuring points
and correct as necessary via rotor displacement.
♦ Measure and evaluate the lateral (horizontal) radial clearance between the inner casing
and the rotor and correct as necessary via the adjusting elements (Z 58, Section A-A).
♦ Suspend top-half inner casing in a horizontal position and raise slightly.
♦ Clean top-half inner casing and protect against corrosion.
♦ Screw in guide bolts of the bottom-half inner casing.
♦ Degrease the joint faces of the top and bottom halves.
♦ Mount top-half inner casing and tighten several joint bolts.
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♦ With the aid of the adjusting elem ents (Z 58, 59, 60; Section A-A) vertically raise and lower the
inner casing up to stop in order to determ ine the overall radial clearance between the inner casing
and the rotor; evaluate; center the inter casing and record all values.
♦ Apply lubricant to the contact faces of the top calottes (Z 58, Section A-A) and install m arked
spherical washers.
♦ Set up proper clearance between the spherical w ashers and the outer casing; secure adjusting
elements as specified on drawing; check and record all values.
♦ Remove spherical washers and keep ready for further assembly.
♦ Measure, evaluate and record the axial movement of the rotor.
♦ Unscrew joint bolts.
♦ Lift off top-half inner casing, protect against corrosion and store.
♦ Check and record the lateral (horizontal) radial clearance between the inner casing and the rotor.
♦ Measure, evaluate and record the axial clearance between the rotating and stationary blades in
positive and negative direction.
♦ Remove top-half journal bearing.
♦ Remove rotor and store.
♦ Check bottom-half journal bearing and support bearing for damage.
Install Inner Components
Procedure :
♦ Clean interior of bottom -half outer casing and associated inner com ponents and protect against
corrosion.
♦ Insert rotor.
♦ Check alignment dimensions (Assembly data sheet EI, EII) or ascertain via rotor displacement.
♦ Measure and evaluate the exact values at the out er-casing circumferential profile measuring points
and correct as necessary via rotor displacement.
♦ Loosely mount rear top-half bearing pedestal.
♦ Suspend top-half inner casing in horizontal position and raise slightly.
♦ Clean top-half inner casing and protect against corrosion.
♦ Degrease joint faces of top and bottom halves; apply uniform coat of sealant to one joint face.
♦ Mount top-half inner casing and tighten joint bolts as specified.
♦ Install pressure-instrument lines (Z 58, Part 391)
♦ Suspend top-half stationary blade carrier in a horizontal position and raise slightly.
♦ Clean top-half stationary blade carrier and protect against corrosion.
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♦ Degrease joint faces of the top and bottom halves; apply uniform coat of sealant to one joint face.
♦ Mount top-half stationary blade carrier and tighten joint bolts.
♦ Clean front and rear gland bushings and protect against corrosion.
♦ Apply lubricant to guides.
♦ Swing in bottom-half gland bushings.
♦ Degrease joint faces; apply uniform coat of sealant to one side of each pair of joint faces.
♦ Mount top-half gland bushings and tighten joint bolts.
♦ Secure all boltings with spot welds.
♦ Remove all taper pins, jack screws and guide bolts; protect against corrosion and store.
♦ Apply lubricant to top-half guides.
♦ Install spherical washers in the stationary blade carrier and inner casing.
Close Outer Casing
Procedure :
♦ Screw in joint bolts on bottom-half outer casing.
♦ Screw in guide bolts on bottom-half outer casing.
♦ Suspend top-half outer casing from the lifting bosses provided and raise slightly.
♦ Clean top-half outer casing; degrease joint faces of top and bottom halves; apply uniform coat of
sealant to one joint face.
♦ Determine horizontal movement of L-rings (Z 58, Detail X-Y) in the top-half outer casing.
♦ Mount top-half outer casing.
♦ Remove guide bolts and jack screws; protect against corrosion and store.
♦ Tighten joint bolts.
♦ Remove taper pins, protect against corrosion and store.
♦ Install rupture disks and shielding pipes.
Check Alignment and Clearances
Procedure :
♦ Unscrew spacer bolts (Z 58, 59, 60; Section F2-F2, F4-F4) on the bottom -half outer casing;
remove extra washers and retighten the spacer bolts.
♦ Check and record the minimum axial movement (Assembly data sheet) of the rotor.
♦ Remove rear top-half bearing pedestal; raise rotor slightly ; rem ove journal bearing; degrease
bearing and journal area; check and record radial clearance of the journal bearing (Z 58, 60;
Section K4-K4).
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