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Field Service: Problem Resolution - Feb. 2010
- 2. Piping Technology & Products, Inc. February 4, 2010 presents Field Services: Problem/Resolution
- 5. Case #1 – Design Custom Supports for Special Requirements Custom Designed Supports in the Field
- 6. Case #2 – Development of Slide Plates for High Temperature Applications Problem: Debonding of slide plate material from backing plate occurs due to high temperatures (over 350˚F.) Examples of Slide Plates Not Attached
- 8. Case #3 – New Expansion Joint Design for Harsh Conditions Problem: Harsh operating conditions and environment decreased the usable life span of a metallic expansion joint
- 9. Resolution: Design and fabricate a replacement self-cleaning slip type expansion joint Case #3 – New Expansion Joint Design for Harsh Conditions Corrosion Resistant Inner Barrel Aluminum/Bronze Bearing Sleeve
- 10. Case #4 – Quick-Turn Service on Metallic Expansion Joint Problem: Failure of adjacent line anchors causes the failure of the 48” expansion joint Damaged Expansion Joint in the Field
- 11. Case #4 – Quick-Turn Service on Metallic Expansion Joint Resolution: Fabricate replacement expansion joint with tie-rods incorporated into the design Tie Rods: Devices, usually in the form of rods or bars, attached to the expansion joint whose primary function is to continuously restrain the full pressure thrust during normal operation while permitting only lateral deflection
- 12. Case #5 – Site Survey Reveals Improper Installation Problem: Spring supports malfunction because of failure to remove travel stops Constant Springs with Travel Stops in Place Variable Springs with Travel Stops in Place
- 14. Case #6 – Adjustment Required for Proper Functionality Problem: Improperly loaded spring supports cause inconsistent pipe system performance Decrease in Load Required Balance of Load Required Increase in Load Required
- 15. Case #6 – Adjustment Required for Proper Functionality Resolution: Field service must be performed on the supports in order to adjust the load to proper operating position and rectify the situation Spring Supports Adjusted to Operating Load Variable Spring at Installed Position
- 16. Case #7 – Site Survey Confirms Need to Replace Snubbers Problem: Miscalculation of snubber settings causes leakage of hydraulic reservoir Fully Extended Cylinder Completely Retracted Cylinder
- 17. Resolution: Provide new snubbers, set them correctly, and reinstall them in the piping system Case #7 – Site Survey Confirms Need to Replace Snubbers Removing the Damaged Snubber Newly Installed Replacements
- 18. Case #8 – Refurbish Roller Bearings in the Field Problem: High lateral loads caused failure of roller bearings on upthrust constant Resolution: Reduce lateral load and refurbish roller bearing shaft assemblies during outage
- 19. Case #8 – Refurbish Roller Bearings in the Field Removal of Damaged Components Installation of Replacement Parts
- 20. Case #9 – Field Installation of Low Friction Slide Plates Resolution: Field fabricate slide plates to be installed between the pipe stanchion and the support Problem: Initial design incorporated steel to steel sliding surfaces with high coefficients of friction (.6 to .7) Fabrication of Slide Plates in the Field
- 21. Case #9 – Field Installation of Low Friction Slide Plates Installation of Slide Plates in the Field New Coefficient of Friction: .08 to .12
- 22. Case #10 – Development of Multi-Function Support Problem: Inadequate support design causes pipe shoes to fail repeatedly
- 23. - The line temperatures ranged from 650°F to 1100°F. - PT&P performed full EPC services and manufactured all of the supports for this project. - Finite Element Analysis was also performed. Finite Element Analysis Resolution: Develop special design incorporating steel as the primary supporting element Case #10 – Development of Multi-Function Support
- 24. Case #10 – Development of Multi-Function Support Restoration of insulation after installation of new shoes Steam lines after installation of PT&P’s newly designed shoes
- 27. Please send any additional questions or inquiries to: [email_address] We invite you to visit our Discussion Forum and follow us on Twitter at www.pipingtech.com PT&P Webinar – Field Services: Problem/Resolution
Hinweis der Redaktion
- Hello everyone, I would like to welcome you to our Webinar on Field Services: Problem Resoultion. The Webinar today is hosted by Piping Technology & Products. I am Jerry Godina and I will be your presenter. 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.
- For those of you who are unfamiliar with PT&P, I want to quickly go over some background information. If you would like to know more, please visit our “About Us” section at pipingtech.com. Our parent company, Piping Technology & Products, Inc., also known as PT&P, is a member of MSS, SPED, and APFA In business since 1975, Piping Technology & Products, Inc. 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. The focus of today’s webinar will be about the resolution of conflicts at the site. Foreseen could be accommodated during the design phase and carried through the manufacture OR those seen in operation which warranted retrofit at the site.
- Case: It was necessary to increase the lifespan of an expansion joint for a coal-fired power plant. The solution was to design a self-cleaning slip-type expansion joint. Several special requirements where met by a combination of design features and material specifications including an aluminum bronze bearing sleeve. The inner barrel (which is directly in the vision of the operator) is uniquely plated to be corrosion resistant. This operator is using a load cell to measure the force required to move the joint. Pressure tests were used to check the six packing seals. This joint is to be installed in a horizontal position in the mid-span of 40" between guided supports. The design conditions are 12 " of movement, 650 ° F, and 50 PSI of internal pressure. http://www.pipingtech.com/news/arc_pw_1994/expjt1994_09.htm
- Problem: Piping Technology & Products, Inc. received an emergency request through the website on Friday at 5:30 pm from a customer. The customer reported that the line anchors had failed, causing one of the 48” expansion joints to squirm. Resolution: Friday evening they sent PT&P the drawings and a purchase order for the job. On Saturday, the expansion joint was formed, and air freighted back to the customer on Sunday morning. The pipeline was back in operation on Sunday. PT&P suggested that tie rods be installed to prevent future squirming of the expansion joint.
- Case: Limited use of graphite and temperature limits of PTFE, 25% Glass Filled for use in merchant plants Solution: Development of stainless steel encased Marinite to reduce heat gradient & withstand transients PTFE, 25% glass filled material was not protected from high temperatures Graphite was not strong enough to withstand water hammer in this application The Marinite insulator assembly allows the use of PTFE, 25% glass filled, as the sliding surface for lines with high operating temperatures and high dynamic loading - Maximum operating temperature for PTFE ≈ 325F –after which the glue could become dis-bonded - Using soli8d sheet of graphite proved unacceptable because of dynamic loading conditions Bronzphite® can also be used for high temperatures and high loads
- Problem: Up thrust constants are not designed to absorb lateral movement. The side to side movement of the pipe caused the bearings to become damaged and eventually fail. Solution: Since the constants cannot be reinstalled to change the direction of the force caused by the movement, slide plates and new shafts must be installed. Piping Technology and Products, designed a shaft that had a washer on the outside surface of the bearings to reinforce the bearing and prevent it from coming apart. To further reduce the force of friction, slide plates were added between the top of the load table and the bottom of the pipe support.
- Insulated Supports Case… Case: Over 116 hot shoes for various sizes of large bore high energy steam lines failed. This caused the Energy Center to completely shut down due to safety concerns and the potential for pipe and/or equipment failure. The original vendor replaced the supports with the same type of supports, and they failed once again. PT&P was called in to survey the site and found that the type of pipe support used was not suited for the service conditions. http://www.pipingtech.com/news/enews/2005/090705.htm W:\\digital_camera\\Digital Album\\images\\Product Photos\\Competitor Products (field service survey and suggested replacement)
- Because the elevations of all the piping were fixed, PT&P had to develop a pipe support design that would dissipate heat, in order to protect the PTFE, 25% glass filled slide plates from thermal damage. Natural Draft Air Cooling has several advantages over previous designs: 1. Since the insulation does not carry any mechanical load, it can be chosen solely on the basis of its thermal properties. In particular, cyclic loading, which has caused insulation failure, is not a problem. 2. The support provides effective restraint for all six possible components of loads, X, Y, Z-Rotational and Translational. In particular, axial and Torsional loads are readily accommodated. These represent difficulties for supports which rely on the insulation. 3. It is easily installed in the field and is attached to the pipe with a standard bolted pipe clamp. Thus, there is no field welding. The line temperatures ranged from 650°F to 1100°F. PT&P performed full EPC services and manufactured all of the supports for this project. Finite Element Analysis was also performed.
- The top two pictures show the restoration of insulation after installation of new shoes The bottom two pictures show the steam lines after installation PT&P designed the solution needed for this dilemma and acquired a new patent for a pipe support with two clamps that are similar to the Figure 50 light two bolt pipe clamp. Each shoe is attached to a steel plate which is designed to carry the design load, and is shape optimized to minimize heat flow from the pipe.