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Variable Springs Webinar


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This Webinar will focus on the different types of variable spring supports and big ton variable spring supports. Learn about the special features available, in addition to the design of a variable support. View how the different coil configurations produce a unique response to an applied load and see how a spring assembly is loaded. Discover the basic steps in selecting a hanger design and the step by step process used to size a spring for your application.

Published in: Education
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Variable Springs Webinar

  1. 1. Attention all Attendees… <ul><li>Welcome! </li></ul><ul><ul><li>To listen to the audio portion: 1.) Make sure your speakers or headset are on and turned up. </li></ul></ul><ul><ul><li>OR </li></ul></ul><ul><ul><li>2.) Dial the phone number and use the access code listed in your confirmation e-mail. </li></ul></ul><ul><ul><li>Thank you for attending. We will be starting shortly. </li></ul></ul>
  2. 2. Jerry Godina Lead Spring Support Designer Presenter
  3. 3. Piping Technology & Products, Inc. Presents Variable Spring Supports and wholly owned subsidiaries: US Bellows Sweco Fab Pipe Shields Anchor/Darling Ent.
  4. 4. PT&P and Subsidiaries U.S. Bellows, Inc.  Metallic Expansion Joints  Thin-Wall and Thick-Wall  Rectangular Expansion Joints  Fabric Expansion Joints  Slip-Type Expansion Joints PIPING TECHNOLOGY & PRODUCTS, INC. - Engineered Pipe Supports - Variable, 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 IAS Certified, Member of MSS, SPED, APFA Member of EJMA SWECO Fab, Inc.  Pressure Vessels  Pig Launchers/Receivers  Spectacle/Line Blinds  Instrument Supports  ASME/Misc. Fabrication ASME U-Stamp & R-Stamp Pipe Shields, Inc. Insulated Pipe Supports  Commercial & Light Industrial  Heavy Industrial – Base Mounted Types, Anchors  Pipe Riser Clamps ISO 9001-2000 Certified Fronek A/D Ent., Inc.  Hydraulic Snubbers - Short & Adjustable Strut  Mechanical Snubbers  dynA/Damp Compensating Strut ASME Nuclear Certified
  5. 5. Calculate hanger loads due to piping weight Calculate thermal movement of piping at each hanger location Determine hanger locations Select hanger type Check clearances 1 2 3 4 5 Spring Hanger Design Basic Steps in Spring Hanger Design
  6. 6. 1.) Relatively small thermal deflections, usually less than or equal to 2&quot; are anticipated 2.) A difference in the supported load from the installed to the operating condition is acceptable Variable Spring Supports Characteristics
  7. 7. Variable Spring Supports Spring Design Parameters <ul><li>Configuration </li></ul><ul><ul><li>Short (PTP-1) </li></ul></ul><ul><ul><li>Standard (PTP-2) </li></ul></ul><ul><ul><li>Double (PTP-4) </li></ul></ul><ul><ul><li>Triple (PTP-6) </li></ul></ul><ul><ul><li>Quadruple (PTP-8) </li></ul></ul><ul><li>Size </li></ul><ul><ul><li>23 Standard Sizes </li></ul></ul><ul><ul><li>50 to 50,000 lb. Load </li></ul></ul><ul><li>Type </li></ul><ul><ul><li>Types A, B and C </li></ul></ul><ul><ul><li>Types D and E </li></ul></ul><ul><ul><li>Type F </li></ul></ul><ul><ul><li>Type G </li></ul></ul>
  8. 8. Variable Spring Supports Type A
  9. 9. Variable Spring Supports Types B & C Type B Type C
  10. 10. Variable Spring Supports Types D & E Type D Type E
  11. 11. F-Type Variables with Fully Adjustable Travel Stops Variable Spring Supports Type F Type F F-Type Variable with Unique 3-Coat Paint System 23&quot; F-Type Variables with Rollers
  12. 12. G-Type Variable Springs with Chained Travel Stops Variable Spring Supports Type G Type G G-Type Variable Springs G-Type Variable Springs
  13. 13. Variable Spring Supports Design Features: Spring Size & Load Capacity Height O.D. Wire Dia. Pitch
  14. 14. Total Deflection = ½ ∙ Y Total Deflection = Y Total Deflection = 2 ∙ Y Total Deflection = 3 ∙ Y Total Deflection = 4 ∙ Y Variable Spring Supports Design Features: Spring Configurations
  15. 15. Spring Supports Load & Travel Table Variable Spring Supports Spring Sizing Spring Supports Load and Travel Table
  16. 16. Step 1: Determine a theoretical spring rate ∆ Load / Movement Given the following design parameters: A.) Operating Load: 3000 B.) Installed Load: 3300 C.) Movement: ½&quot; 3300-3000 ½&quot; 600 Step 2: Review Load and Travel Table Chart Variable Spring Supports Spring Sizing
  17. 17. VARIABILITY = (Spring rate ∙ movement ) /Operating Load Step 3: Review Load and Travel Table Chart Step 4: Check Variability Factor VARIABILITY = (600 ∙ ½&quot;) / 3000 0.1 equal to 10% ≤ 25% Final Answer: PTP-2-130 Variable Spring Supports Spring Sizing
  18. 18. Check Hot & Cold Loads Compress Spring to Solid and Release 3 Times Zero out Load Cell Compress Spring to Cold Load Mark Cold Location on Can Measure for Travel Stop Length Compress Spring to Hot Load Variable Spring Supports Spring Loading/Assembly
  19. 19. Mark Hot Location on Can Measure Distance Between Loads Should Match Desired Travel Compress Spring to Cold Load & Place in Travel Stops Release Load and Check Travel Stops Remove Spring & Move to Table Using Hoist Variable Spring Supports Spring Loading/Assembly
  20. 20. Add Name Tag and Straps Drill & Hammer Rivets into Place Measure the Remaining Slot for Hydro-Test Stops Put Stops in Place & Strap Them Down Last Step: Measure and Adjust Load Flange Height if Necessary Variable Spring Supports Spring Loading/Assembly
  21. 21. <ul><li>Load Flange </li></ul><ul><li>Load Tag: Both Hot (red) and Cold (white) Load Indicators </li></ul><ul><li>Installation Instructions </li></ul><ul><li>Travel Stops (loaded to your pre-defined cold load) </li></ul><ul><li>Hot-Dipped Galvanized </li></ul><ul><li>Adjustable Load Column (F-Can) </li></ul><ul><li>Max. Hydro-Test = 2x Operating Load </li></ul>Variable Spring Supports Standard Features Standard Features B-Type Variable Springs F-Type Variables
  22. 22. <ul><li>Lifting Lugs </li></ul><ul><li>Upper & Lower Limit Stops </li></ul><ul><li>Collars </li></ul><ul><li>Special Paint </li></ul><ul><li>Guided Load Columns </li></ul><ul><li>Extended Load Columns </li></ul><ul><li>Chained Travel Stops </li></ul><ul><li>Jacking Bolts </li></ul><ul><li>Slide Plates </li></ul>Extended Load Column Special Paint Chained Travel Stops Slide Plates Variable Spring Supports Special Features Special Features
  23. 23. Big-Ton Spring Supports Development of the Big Ton Innovation and customer service enabled PT&P to carve out a niche in the pipe support industry. The development of the &quot;Big Ton&quot; provides an interesting illustration of this. A customer asked PT&P if there was a way to support a large vessel that would be both stable and economical. PT&P responded by designing the big ton in 1980, which is essentially a table atop muscle springs. Top Load Flange Bottom Load Flange Load Studs Division & Centering Plates Travel Stop Rods Spring Pressure Plate Housing Load Stud Nut Coil Spring
  24. 24. <ul><ul><li>Loads: Cold and Hot </li></ul></ul><ul><ul><li>Movement </li></ul></ul><ul><ul><li>Space Constraints - Length - Width - Height </li></ul></ul>L W Big-Ton Spring Supports Standard Design Considerations H
  25. 25. <ul><li>Dimensions: 20&quot; x 20&quot; x 8 7/16&quot; </li></ul><ul><li>Load: 7839 lb. </li></ul><ul><li>Movement: 0.48&quot; Upward </li></ul><ul><li>Spring Rate: 1500 lb/in. </li></ul><ul><li>8' Long Big Ton Spring Assembly </li></ul><ul><li>Operating load: 76,800 lb. & downward travel: 0.894&quot; </li></ul><ul><li>Includes PTFE, 25% glass filled slide plates </li></ul><ul><li>Dimensions: 42&quot; x 36&quot; x 32&quot; </li></ul><ul><li>Load: 25,400 lb. </li></ul><ul><li>Movement: 7/16&quot; Upward </li></ul><ul><li>Spring Rate: 4400 lb/in. </li></ul>Big-Ton Spring Supports
  26. 26. Big-Ton Spring Supports <ul><li>Cracker Unit Mobilization </li></ul><ul><li>Designed and Fabricated a Big Ton Variable with Rollers </li></ul>Shipment of Big Ton Spring Supports
  27. 27. Big-Ton Spring Supports Application 120,000 lb. Load Big Ton Springs for a Large Diameter Elbow
  28. 28. Installation Guidelines Attachment to Structure F-Type Bolted to Structure F-Type Welded to Structure B-Type with Beam Clamp C-Type with a WT
  29. 29. Installation Guidelines Attachment of Hardware Attachment of Hanger Rod Attachment of Hanger Rod and Trapeze
  30. 30. Installation Guidelines After Hydro-Testing (if applicable), Remove Travel Stops
  31. 31. Installation Guidelines Load Indicator Setting (Cold/Hot Load)
  32. 32. Average life expectancy of: 10 years 20 years 30 years Unprotected Spring Hanger Galvanized Hardware Neoprene Coated Springs Maintenance Useful Life of a Spring Hanger
  33. 33. <ul><li>Leaking flanges </li></ul><ul><li>Continued pump & turbine problems related to bearings, seals and misalignment. </li></ul><ul><li>Sagging lines and liquid trapped in low sections </li></ul><ul><li>Increased system stresses resulting in potential piping failures. </li></ul>Due to inadequate support of a piping system, static loads can cause problems, such as: Maintenance Static Loads
  34. 34. <ul><li>Ten Point Operational Integrity Check: </li></ul><ul><ul><ul><li>Beam attachment </li></ul></ul></ul><ul><ul><ul><li>Beam attachment pin </li></ul></ul></ul><ul><ul><ul><li>Spring hanger attachment </li></ul></ul></ul><ul><ul><ul><li>Load flange movement </li></ul></ul></ul><ul><ul><ul><li>Spring coil corrosion </li></ul></ul></ul><ul><ul><ul><li>Check load indication for hot load </li></ul></ul></ul><ul><ul><ul><li>Note load deviations </li></ul></ul></ul><ul><ul><ul><li>Turnbuckle/locknuts </li></ul></ul></ul><ul><ul><ul><li>Threaded rod/weldless eye, hex nuts </li></ul></ul></ul><ul><ul><ul><li>Pipe clamp attachment pin </li></ul></ul></ul>Maintenance Inspection Criteria
  35. 35. <ul><li>Re-calibration: </li></ul><ul><ul><li>Spring hanger missing a name plate </li></ul></ul><ul><ul><li>Operating load range > 15,000 lb. </li></ul></ul><ul><ul><li>Spring is in good operating condition </li></ul></ul><ul><ul><li>Cost of field time & equipment required is less than the cost of new spring hanger </li></ul></ul>Re-calibration Criteria
  36. 36. Field Examples/Tips Visual Inspections: Out of Adjustment Increase of Load Required Decrease of Load Required Balance of Load Required
  37. 37. Field Examples/Tips Visual Inspections: Removal of Travel Stops
  38. 38. <ul><li>Spring hangers can be set to desired position by turning the turnbuckles/load column </li></ul><ul><li>When nameplates are present indicating design hot load, adjustments can be made during operation </li></ul><ul><li>When nameplates are present indicating design cold load, adjustments can be made during shutdown (assuming the supported load has not changed) </li></ul>Adjustments After Inspection
  39. 39. <ul><li>Replacement: </li></ul><ul><ul><li>Spring hanger has no useful life remaining due to corrosion and fatigue </li></ul></ul><ul><ul><li>Rust damage makes it necessary to replace threaded rods, bolts, pipe attachments, etc.. </li></ul></ul><ul><ul><li>Equipment to be supported has been modified/changed from its original design </li></ul></ul>Replacement Criteria
  40. 40. Field Examples/Tips Visual Inspections: Incorrectly Sized Larger Size Spring Required Smaller Size Spring Required
  41. 41. Field Examples/Tips Visual Inspections: Damaged Supports
  42. 42. <ul><li>Lines/equipment must have a temporary support while repairs are made </li></ul><ul><li>Re-install travel stops when the line is taken out of operation (shutdown) to prevent line/equipment movement and possible readjustment of the springs </li></ul><ul><li>If re-calibration is recommended and name plate is missing, the variable spring should be stenciled at the proper installed and operating positions or provide these loads </li></ul><ul><li>Remove spring hanger assembly </li></ul>Shutdown/Isolation Procedures
  43. 43. <ul><li>Engineering and Design </li></ul><ul><ul><li>Piping, pipe support and structural design </li></ul></ul><ul><ul><li>3D modeling technology </li></ul></ul><ul><ul><li>Pipe Stress Analysis </li></ul></ul><ul><ul><ul><li>ANSYS </li></ul></ul></ul><ul><ul><li>Finite Element Analysis </li></ul></ul><ul><ul><ul><li>Special stress/thermal problems </li></ul></ul></ul><ul><ul><ul><li>Pro/E for 3-D Part Design </li></ul></ul></ul><ul><ul><ul><li>ANSYS for Mesh Generation + Analysis + Results Analysis </li></ul></ul></ul><ul><ul><li>Field Testing </li></ul></ul>Value-Added Services Engineering & Design Department
  44. 44. <ul><li>On-site installation guidance </li></ul><ul><li>On-site inspection/maintenance of pipe supports </li></ul><ul><li>On-site snubber inspection </li></ul><ul><li>A system of stock standard Items </li></ul><ul><li>“ On-call” engineering team </li></ul><ul><li>Available 24x7 </li></ul>PT&P’s “On-call” engineering team guarantees a response time of 30 minutes Value-Added Services Field Services & 24x7 Emergency Service
  45. 45. Friday, 5:30pm Saturday Sunday Value-Added Services 24x7 Emergency Service for a 48&quot; Expansion Joint
  46. 46. Cold Shoe Testing Constant Testing Marinite Slide Plate Testing Spring Load Testing Anchor Shoe Testing Value-Added Services Product Testing
  47. 47. <ul><li>> 30,000 spring coils </li></ul><ul><li>> 1 million Lb. of standard items </li></ul><ul><li>Full year supply of beam, angle, plates, rods…etc. </li></ul>At Piping Technology & Products, we stock: Value-Added Services Inventory & Stocking Capabilities
  48. 48. Fatigue Testing Pressure Balanced Expansion Joints FEA: Plate Thickness and Pipe Stress Inspection and Maintenance of Supports “ Over 450 Project Examples” Value-Added Services Technical Literature Online
  49. 49. PT&P Webinar: Variable Spring Supports Please send any additional questions or inquiries to [email_address] Useful Links: Thank You for Attending… <ul><li>Online Quote: </li></ul><ul><li>Online Catalog: </li></ul><ul><li>Technical Webinars: webinar </li></ul><ul><li>Blog: </li></ul>