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Influences on Piping Design - Spring Supports

Influences on Piping Design - Spring Supports



Part 7 of our continuous Piping Design Series will focus on resilient support elements including variable, constant, and big ton springs. We will review the operating conditions that help you to ...

Part 7 of our continuous Piping Design Series will focus on resilient support elements including variable, constant, and big ton springs. We will review the operating conditions that help you to define the ideal pipe support for your application. See how standard pipe support hardware can be used in conjunction with stock spring components to design entire pipe support assemblies. Discover how to modify standard spring elements to fit unusual configurations in a piping system.



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  • Hello everyone, I would like to welcome you to our Webinar featuring pipe clamps. The Webinar today is hosted by Piping Technology & Products. I am Jerry Godina and I will be your presenter. If you would like to join in on the audio portion of the presentation, please make sure you select speakers/headphones in the audio choice box and double check that your volume is turned up. You can also listen to us by telephone, for the United States, just dial: (1) 516-453-0014, for countries other than the US, please refer to the list of numbers in your confirmation e-mail. The access code for this presentation is 143-086-073 Also, if you have a question, please feel free to chat it to us during the presentation in the text box you see to the right of the presentation or if you prefer, you can ask questions after the presentation during our “Questions and Answers Session.”
  • For those of you who are unfamiliar with us, I want to quickly go over some background information. If you would like to know more, please visit our “About Us” section at www.pipingtech.com. Our parent company, Piping Technology & Products, Inc., also known as PT&P, has been… in business since 1975, PT&P and its wholly owned subsidiaries, US Bellows, Sweco Fab, Pipe Shields, and Anchor Darling, offer a wide range of engineered products and services for various industries and applications. Our product line is extensive… from engineered pipe supports, expansion joints, pre-insulated pipe supports, and miscellaneous fabrication to various engineering and technical services, PT&P has decades of experience providing products and services for all your engineering and construction needs. DO NOT go over certifications—that is on the next slide
  • ASME Code B31.3 Clause 321.1.1
  • Material and/or insulation for range of complexity
  • Material and/or insulation for range of complexity
  • Thank You for Joining Our Webinar on Expansion Joints… We are open to take your questions; however, if you have any additional questions or inquiries, you can send us an email at info@pipingtech.com

Influences on Piping Design - Spring Supports Influences on Piping Design - Spring Supports Presentation Transcript

  • Webinar SeriesOverview of How Piping Design & Analysis InfluencesPipe Support Selection & Design Influences on Pipe Support Design Spring Supports Webinar Session # 7 August 22, 2012 By Piping Technology & Products
  • Je rry G odina L ead Pipe Support DesignerIf you have any questions, comments orsuggestions, please email us atenews@pipingtech.comTo request a PDH certificate, email enews@pipingtech.com
  • PT&P Structure PIPING TECHNOLOGY & PRODUCTS, INC. • Engineered Pipe Supports • Variables, Constants, Big-tons • Vibration Control Devices – Snubbers, Sway Struts • Support Assembly Components – Clamps, misc. hardware • Pre-insulated Pipe Supports – Cryogenic/cold & Hot Applications • Fabricated Pipe Shoes, Guides & Anchors • Slide Bearing Plates • Anchor Bolts, Embed Plates ISO 9001:2008 Certified ICBO Certified, Member of MSS, SPED, APFAU.S. Bellows, INC. SWECO FAB, INC. Pipe Shields, INC. Fronek A/D E.• Metallic Expansion Joints • Insulated Pipe Support • Hydraulic Snubbers • Pressure Vessels• Thin-wall, Thick-wall • Commercial & Light  Short strut • Pig Launchers & industrial• Fabric Expansion Joints Receivers Adjustable strut • Heavy Industrial -• Rectangular Expansion • Spectacle/Line Blinds based on Mounted, • Mechanical SnubbersJoints • Instrument Supports Anchors • DynA/Damp• Slip-type • Pipe Riser Clamps Compensating Strut • ASME/Misc. FabricationMember of EJMA ASME U-Stamp ASME Nuclear Qualified
  • Webinar Series: Overview of How Piping Design & AnalysisInfluences Pipe Support Selection & DesignTopic Session / DateIntroduction I. Overview of Piping (completed)Preliminary I. Piping System II. The Total SystemPiping Design Components (completed) (completed)Basic Concepts I. Flexibility Analysis II. Design Basesof Stress (completed) (completed)AnalysisInfluences on I. Rigid Supports II. Spring Supports III. RestraintsPipe Support (completed) August 22, 2012 August 29, 2012Design
  • Introduction Designers Pipe Support Integration Designers Designers Structural PipingEffective coordination between designers of multipledisciplines is necessary during the planning stages. Flow Chart Product of that coordination will be seen during erection and subsequently throughout the plant operation.
  • Introduction Why Pipe Supports ?  Support piping system loads  Restrain or guide our piping system elements  Permit movement of our piping system  Transmit pipe loads to structural members  Prevent heat transfer to the surrounding structure
  • Introduction Key Pipe Support Requirements All pipe supports should be designed to:  Limit piping stresses to acceptable Code standards  Prevent leakage at pipe joints  Limit excessive thrusts and moments on connected equipment  Limit excessive stresses in supporting or restraining elements  Eliminate resonance with imposed or fluid-induced vibrations  Eliminate interference with thermal expansion and contraction in the piping system  Maintain engagement during all phases of operation  Reduce excessive piping sag in piping requiring drainage slope  Minimize excessive distortion or sag of piping subject to creep under conditions of repeated thermal cycling  Limit excessive heat flow, exposing supporting elements to temperature extremes outside their design limits
  • Introduction Other Pipe Support Standards  ASME B31.1 Power Piping  ASME B31.3 Process Piping  MSS SP-58 Pipe Hangers and Supports – Materials, Design, and Manufacture  MSS SP-69 ANSI/MSS Edition Pipe Hangers and Supports  MSS SP-77 Guidelines for Pipe Support Contractual Relationships  MSS SP-89 Pipe Hangers and Supports – Fabrication and Installation Practices  MSS SP-90 Guidelines on Terminology for Pipe Hangers and Supports
  • Introduction Major factors which impact the overall design and cost of supports include:  Operating Conditions  Loads  Movements  Temperatures  Standard vs. Custom  Material  Dimensions / Sizing  Adjustability  Built-in  As added feature
  • General Support Styles Typical Design Parameters Pipe Load DeflectionSpace Requirements Attachment Point
  • General Support Styles Base Mounted Supports  Rigid Components  Flexible Components F-Type Spring Concrete FoundationAuxiliary Steel Upthrust Constant
  • General Support Styles Suspended Supports  Rigid Components Structural  Flexible Components SteelConstantSprings Trapeze Style Support Variable Spring and Clamp Assembly
  • Support Styles & Functions Guidelines to Consider:  Primary support function  Support location  Dependent upon existing steel / foundation  Location of critical equipment (valves, fittings, instrumentation)  Available pipe attachment points (straight-run preferred)  Necessity for supplementary function  Ability to utilize supports during inspections, maintenance and shut-downs  Need for adjustability
  • Support Styles & Functions General Spring Supports – Variables Characteristics • Intended to support pipe load in vertical direction Variable Spring • Designed for relatively small thermal deflections • Designed to accommodate a Rod difference in supported load • 7 different attachment configurations available Weldless Eye Nut • Coil size determines load carrying capacity • Coil configuration determines the spring rate Pipe Clamp
  • Support Design Influences Variables – Variability Factor Total Deflection = 4∙YVARIABILITY = (Spring rate ∙ movement ) /Operating Load Total Deflection = 3∙YMaximum Variability = 25% Total Deflection = 2∙Y Total Deflection = YTotal Deflection = ½∙Y
  • Support Design Influences Variables – Variability Factor Appropriate spring rate needed to maintain variability within acceptable limits.
  • Support Design Influences Variables – Available Attachment Points Location of support attachment point will determine variable spring component configuration. A-Type F-Type D-Type
  • Support Design Influences Variables – Space Constraints / AdjustabilityWill components fit within theavailable space? Will Adjustability Obtained via components Threaded Load Column accommodate the required deflection? B-Type Variable Spring F-Type Variable Spring Can
  • Support Design Influences Variables – Temperature / Material“Furnace” Style Support ComponentsFabricated for use in High TemperatureEnvironment
  • Support Design Influences Variables – MaterialStainless Steel Components Used inCorrosive Environment to CombatDeterioration
  • Support Design Influences Variables – Load / Movement Load Stud Nut Load Studs Top Load FlangeNon-standard Coil Configurations Travel Stop Rodsto Accommodate Large Loads Spring Pressure Plate Division & Centering Plates Coil Spring Bottom Load Flange Housing Parallel Coil Arrangement “Big Ton” Design
  • Support Styles & Functions General Spring Supports – Constants Characteristics • Intended to support pipe load in vertical direction • Designed for relatively large thermal deflections • Designed to accommodate the same load throughout working range • 8 different attachment configurations available • Available in either “vertical” or “horizontal” configuration • Coil / cam combination determines the load carrying capacity
  • Support Design Influences Constants – Total Travel vs. Actual Travel Requirement The cam-coil combination determines the total travel available and the load which can be supported.TotalTravel Actual Travel
  • Support Design Influences Constants – Configurations PTP-100 Constant PTP-200 Constant• Vertical orientation • Horizontal orientation• Compact design • Easier placement & adjustment• Less rotation inertia • High degree of flexibility
  • Support Design Influences Constants – Available Attachment PointsLocation of supportattachment point willdetermine constant springcomponent configuration.
  • Support Design Influences Constants – Space Constraints / Adjustability C-Type Constant Spring Dual B-Type Constant Spring Trapeze Assembly Will components fit within the available space?Adjustability Obtained via Threaded Load Column
  • Support Design Influences Constants – Material Standard Carbon Steel Constant AssemblyNeoprene Coated U-TypeConstant Spring Support Modified Stainless Steel Design Used to Prevent Corrosion
  • Support Design Influences Constant – Custom Load / Movement Non-standard Frame to Accommodate Travel RequirementsBig Ton Concept Used inLimited Space Application
  • Support Styles & Functions General Spring Supports – Sway Braces Characteristics • Intended to provide restraint force primarily in horizontal direction • Designed for relatively small thermal deflections • Restraint force is a function of the spring rate • Accommodates relative deflections in both “push” or “pull” directions
  • Support Design Influences Sway Braces: Load / Movement Various Sized Sway Braces
  • Support Design Influences Sway Braces: Available Attachment PointsStationary PipeAttachment Attachment Point Point
  • Support Design Influences Sway Braces: Adjustability Feature Adjustability Obtained via Threaded Load Column C-C Established inDesign Specifications Adjustability Obtained via Threaded Turnbuckle
  • Spring Support Design Guidelines Consider the magnitude of required movement Determine suitability of variable spring vs. constant spring Select appropriate size/type Always check for adequate space in the field
  • Next Webinar Session:August 29, 2012Session 8: Influences on Pipe Support Design – RestraintsOur conclusive Part 8 of the Piping Design series will concentrate on restraint devices used fortransient loading conditions. Explore different types of components and their particular functions,including hydraulic snubbers, mechanical snubbers, and sway struts. Identify which designparameters to consider when selecting the most appropriate restraint device. Well conclude ouroverall series with general guidelines focused on standardization and versatility of pipe supportsthroughout the piping system.If you have any questions, comments or suggestions, please email usat enews@pipingtech.com