Twisted Tube ® Heat Exchanger Inspection with Eddy Currents
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Heat exchangers are essential to the operation of many systems in various industries, processing plants and electric power generation plants, for example. A unique type of heat exchanger (HX) was introduced several years ago: the Twisted Tube® HX. They offer the highest levels of efficiency, but have always been a challenge for periodic inspections. Until now. A twisted tube is composed of two straight, circular sections near the tubesheets, separated by a length of helical, oval tube. This helix creates a small, central circular passage along the length of the tube where traditional bobbin probes can be pushed and pulled. However, standard ECT probes deliver suboptimal performances — detecting, characterizing, and sizing flaws are problematic because of poor signal-to-noise ratios. Flaws on the wall furthest away from the tube’s center (crest) produce much smaller, distorted signals than same-size flaws in the narrow section, closest to the tube’s center (dip). This is because of the liftoff created by the tube’s geometry between its walls and the ECT probe. This amount of liftoff translates into a lower probability of detection and less accurate sizing.
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Motorized rotating pancake coil (MRPC) probes have been developed to overcome the limitation of circumferential cracking and to provide a high resolution mapping of the tube, sensitive to all types of flaws in any orientation. However, this inspection technique remains very slow and not appropriate for inspecting the entire length of the tube. Eddy current array (ECA) tubing probes were introduced in the late 1990s with success for the inspection of Steam Generators. However, these probes are very specialized, equipment and software-specific, and cost prohibitive outside the scope of SG applications.
Interest has recently increased with regards to circumferential cracking resulting in high interest in ECA probes. Manufacturers are responding by proposing various “arrays” which can be categorized as non-multiplexed or multiplexed array probes. Non-multiplexed probes are generally limited to a combination of bobbins and coils equal to the number of physical channels of the source ECT tester (usually 4 or 8). This category also includes Air Conditioning (AC) probes. Multiplexed probes leverage the physical inputs of an ECT instrument via time slots and can physically accommodate up to 256 channels.
This paper provides the laboratory and field results of bobbin probes, non-multiplexed array probes, and multiplexed array probes. The performance of the various techniques is compared and other inspection requirements such as C-Scan imaging are described in details.
Detecting Cracks and Corrosion in Aircraft Longerons
Aircraft are the backbone of several industries and, as such, are subjected to intense and near-continuous use, making preventive maintenance critical. Maintenance protocols are exhaustive but time-consuming, especially when fuselage and wing longerons are involved.
Longerons usually carry larger aircraft loads and help to transfer skin loads to the internal structure. Longerons nearly always attach to frames, ribs, or the skin of the aircraft. Fatigue and stress cracks eventually appear around the fasteners used to secure longerons to structures. Such cracks risk going undetected because they are small (typically 1.25 mm or 0.05 in.), they are near and under fastener heads, and often under surface coatings. The faying surface between longerons and skin is also prone to corrosion and must be inspected.
Inspecting In-Service Storage Tank Annular Rings for Corrosion
As its name implies atmospheric storage tanks contain liquids at atmospheric pressure. The outer edge at the base of this type of tanks is notoriously difficult to shelter from the elements, exposing this critical area to corrosion and, if left unchecked, leaks and unforeseen tank failures.
Read more at www.eddyfi.com
High-Speed Remote-Field Testing in Carbon Steel Tubing
Carbon steel tubing is present in all industries. The comparative high strength, crack resistance, and low cost of carbon steel tubing makes it the most prevalent type of pipe and tubing material worldwide.
Read more at www.eddyfi.com
Inspecting Laser Welds in Component Manufacturing
Welding techniques are numerous and each of them has its
peculiarities. Laser beam welding (LBW) uses a laser to
concentrate heat, very quickly producing deep, narrow welds.
Laser welding is common in nuclear applications and highvolume
applications such as automotive component
manufacturing, as well as others where speed and excellent
accuracy are necessary.
Find out more at www.eddyfi.com
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The case for Hadoop performance, short presentation on the need for BDOOP, the Big Data Operations On Performance group. Presents the case why analyzing Hadoop performance is complex, but important to devise cost effective infrastructures.
Originally presented at the Barcelona BDOOP meetup group: http://www.meetup.com/BDOOP-BigData-Operations-On-Perfomance-Barcelona/
Bmc mumbai recruitment 2014 clerk jobs
Clerk positions are available with the BMC Mumbai. There are 942 vacancies for clerks, requiring candidates to have a matriculation certificate with 50% marks and a computer diploma with 30 wpm typing speed in English or Marathi. Candidates must be between 18-33 years of age with relaxations for reserved categories. The pay scale is Rs. 5200-20200 with Rs. 2000 grade pay per month. Interested and eligible candidates can apply online from March 14th to April 3rd 2014 via the www.portal.mcgm.gov.in website.
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Assessing Circumferential Cracking in Non-Ferromagnetic Heat Exchanger Tubes
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Inspection of Stainless Steel Heat Exchanger Tubes with Eddy Current Array Probe
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Detecting Flaws in Condenser Tubing Welds With the DefHi® Probe
This document discusses detecting flaws in condenser tubing welds using the DefHi probe. It notes that seam-welded condenser tubes are prone to defects along welds that are difficult to detect with standard bobbin probes. The DefHi probe uses eddy current testing and a multiplexed array coil configuration to better detect and characterize defects anywhere along tubes. Its software analyzes the multiple data signals to produce C-scans that accurately map defects, differentiating those in the same location or along welds. The DefHi provides advantages over bobbin probes for thoroughly inspecting welded tubes.
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Control rod drive mechanisms (CRDM) are located above nuclear reactor vessels. CRDMs insert, hold, or lift the control rods and are used to stop the nuclear reaction in the event of an emergency. They are therefore essential to the safe operation of nuclear power plants.
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OMS provides pipe end measurement and inspection services to optimize pipeline installation. Their AutoTool measures pipe ends with high accuracy in under 12 seconds. SmartFit software analyzes measurements to sequence pipes for efficient handling and minimize gaps during welding. Clients report reduced costs and delays from using OMS's tools and expertise to improve pipe fit-up.
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This document discusses the components and operation of different types of x-ray tubes, including Crookes tubes, Coolidge tubes, rotating anode tubes, mammography tubes, and rotating envelope tubes. It describes the glass envelope, anode assembly, cathode assembly, and principles of each tube. The key components are the cathode, which emits electrons, and the anode, made of materials like tungsten, which produces x-rays upon electron bombardment. More advanced tubes use rotating or magnetic components to improve heat dissipation and image quality. Proper care and operation within rating charts is important to maximize tube lifespan.
Pipe wizard olympus
The document describes PipeWIZARD, an automated ultrasonic inspection system for pipeline girth welds using phased array technology. It can inspect welds fast, in under 4 minutes, and complies with industry codes. Phased arrays allow electronic beam forming for flexible inspection of different pipe diameters and wall thicknesses. The system provides zone discrimination for accurate defect sizing and detection of flaws in welds. It has been used to inspect over 200,000 welds on various pipeline projects worldwide.
Freditek products
Rototherm has over 40 years of experience in designing and manufacturing differential pressure flow devices. Their facilities are tailored to meet the highest standards in industries like oil and gas. They offer a wide range of flow measurement products including orifice plates, venturi tubes, flow nozzles, and differential pressure transmitters. These products are manufactured to strict standards and suitable for applications in hazardous areas.
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Shell and tube heat exchangers consist of tubes housed inside a large shell vessel. Fluids of different temperatures are circulated through the tubes and shell without mixing. Common types include U-tube, straight tube single pass, and straight tube double pass configurations. Heat is transferred between the fluids through the tubes and baffles direct the shell-side fluid flow across the tubes. Shell and tube heat exchangers are widely used due to their design flexibility, reliability, and ability to operate at a wide range of pressures and temperatures.
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This document discusses different methods and elements of metrology. It describes direct and indirect methods of measurement such as using scales, vernier callipers, and sine bars. It also discusses standards used for measurement, including line standards like standard yards and metres, end standards like end bars and slip gauges, and wavelength standards using laser sources. Environmental factors that influence measurement are also mentioned, along with the importance of measuring in a standard environment.
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Guided wave testing (GWT) uses ultrasonic guided waves to inspect long sections of pipe for metal loss. Recent developments allow GWT to provide semi-quantitative sizing of defects. Validation testing showed GWT can accurately measure flaw depth within 1.1mm, suitable for fitness-for-service assessments. New applications include in-service monitoring of tanks and subsea pipelines using permanently installed GWT systems.
Protech Presentation [New]
ProTech Flow Solutions is a supplier of valves, pipes, fittings and flanges to oil, gas, and utility industries. They offer a wide range of products from leading manufacturers along with additional services like testing and spare parts. The document provides an overview of ProTech, descriptions of their various valve types and product ranges, and details on their quality and contact information.
Protech presentation [new]
ProTech Flow Solutions is a privately owned company that supplies valves, pipes, fittings and flanges to the oil, gas, petrochemical and utility industries. They offer a comprehensive range of products from leading manufacturers globally. Their services include supplying manual and automated valves as well as pipes and related products to end users, contractors, OEMs and distributors worldwide.
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My presentation is about Materials used for dressing , cleaning , irrigating the canals. Also include , irrigation techniques and instruments . Enjoy !!
Thermoplastic Liners
Pumping well challenges for Producers with the advent of horizontal drilling along with pad drilling in some fields. Visit: https://westernfalcon.com
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Presented by Vladimir Iglovikov:
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https://alandix.com/academic/papers/synergy2024-epistemic/
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みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
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みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
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Twisted Tube ® Heat Exchanger Inspection with Eddy Currents
- 1. Twisted Tube® Heat Exchanger Inspection with Eddy Currents Application Note
- 2. Twisted Tube® Heat Exchangers Heat exchangers are essential in many industries. A unique type, the Twisted Tube® heat exchanger (HX), offers: • Highest efficiency among HX • Challenge for periodic inspections because of tube profile 2 © Eddyfi NDT Inc. 2009–2015
- 3. The Challenge A twisted tube is composed of: • 2 straight, circular sections near tubesheets • 1 length of helical, oval tube The helix creates a small, circular central passage along the length of the tube where traditional bobbin probes can be pushed and pulled. 3 © Eddyfi NDT Inc. 2009–2015
- 4. The Challenge Poor signal-to-noise ratios lead to suboptimal performances with standard ECT probes. • Because of liftoff created by tube’s geometry, similar-sized flaws: • Close to crests = small distorted signals • Close to dips = large distorted signals • Results: Lower PoD, less accurate sizing 4 © Eddyfi NDT Inc. 2009–2015
- 5. The Challenge • Common sizing method to determine flaw depth are inaccurate because: • Reduced sensitivity • Large tube signal variations from flaw locations (crest/dip) • IRIS also affected by non-linear geometry • Reflecting echoes not perpendicular to inspected wall. Not an alternative. • Tubes in Twisted Tube® HX come in variety of: • Pitches • Diameters (typical: 19.1–25.4 mm [0.75–1 in]) • Non-ferromagnetic and ferromagnetic materials 5 © Eddyfi NDT Inc. 2009–2015
- 6. The Solution A probe that: • Fits most Twisted Tube® HX • Dynamically adjusts to changing geometry to minimize liftoff and optimize inspection results Result: Patent-pending Twistec™ probe Designed with: • Rotating head • Equipped with two “feelers” that press down the coils they contain against tube’s inner surface. • Pair of oval coils matching helix pitch of twisted tube. 6 © Eddyfi NDT Inc. 2009–2015
- 7. The Solution Twistec probe remains close to surface under test for more precise inspection data • Feelers compress to fit through circular section at the tubesheet Pulling speed: • Approximately 0.3 m/s (12 in/s) Life: • 1500 tubes (60 to 80 tubes/h) Results allow defects to be clearly identified. Twistec probe signals are less noisy than those from a conventional bobbin probe. 7 © Eddyfi NDT Inc. 2009–2015
- 8. The Solution 8 © Eddyfi NDT Inc. 2009–2015 Bobbin Probe Results Twistec Probe Results Crest detection
- 9. The Benefits • Minimized liftoff • Minimized noise • Optimized results • Inner/outer-diameter defect distinction • Determine whether defects are in crests or dips • Easier-to-analyze scan results • More accurate scan results • Longer asset life 9 © Eddyfi NDT Inc. 2009–2015
- 10. www.eddyfi.com