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Constant Spring Supports Webinar
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Constant Spring Supports Webinar


This Webinar will focus on the different types of constant spring supports. Learn about the special features available, in addition to the design of a constant support. View how the different cam/coil …

This Webinar will focus on the different types of constant spring supports. Learn about the special features available, in addition to the design of a constant support. View how the different cam/coil configurations produce a unique response to an applied load. Discover the step by step process used to size a spring for your application. Learn about the different attachments, testing, and installation and maintenance procedures. View examples of failed supports provided by our Field Service Division and learn why they failed and how to prevent it. Gain knowledge of the valuable tips used when deciding to adjust or replace a constant spring support, as well as shutdown and isolation procedures.

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  • Hello everyone, I would like to welcome you to our Webinar on Constant Spring Supports. The Webinar today is hosted by Piping Technology & Products. I am __________________________ and I will be your presenter. Optional: Your normal presenter, Jerry Godina is on a field service call and could not make it today to present, so I will be standing in for him. 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 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 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.
  • Pipe Hangers are designed to control: Longitudinal weight stress in the piping system without creating additional stresses Piping system loads on equipment without limiting or reducing static loads Hanger loads on building structure And physical clearances of hanger components with piping and structure Let’s look at the basic steps in the hanger design: Step 1 is to determine the location of all the hangers Then calculate the hanger loads due to the piping weight Next calculate the thermal movement of the piping at each hangers location Step 4 is to select the hanger type and finally check all clearances
  • Constant hangers are principally used to support pipes and equipment subjected to vertical movement due to thermal expansion at locations where transfer to stress and other supports or equipment can be critical. The maximum recommended variation according to MSS standard from the operating load is 25% for variable spring hangers. If the variation exceeds 25%, a constant support hanger should be used. The constant resistance to a load is achieved by combining a spring coil with a cam which rotates about a main pivot point. The cam is designed such that the distances from the main pivot changes to compensate for the variable resistance during compression of the coil. The MSS standard provides for a tolerance of 6% in the constant load through the travel range. Our constant support hangers are designed per MSS, ANSI, and ASME standards.
  • 3 major design parameters Size – function of both travel & load Configuration Type – explains physical orientation, attachment, and position
  • Example: Given the Following Design Parameters: a.) Operating Load: 3000 b.) Actual Travel: 4 ⅜" Step 1: Determine Total Travel: a.) When Actual Travel is < 5" Total Travel = Actual Travel + 1"  Rounded up to nearest ½" Total Travel = 4 ⅜" + 1" = 5 ⅜"  5 ½" (EXAMPLE) b.) When Actual Travel is ≥ 5" Total Travel = Actual Travel + 20%  Rounded up to nearest ½"
  • Step 2: Review Load and Travel Table Chart Final Answer: Size 41
  • Special Features can be provided if required: --lifting lugs can be helpful for installing large hangers --Upper and lower limit stops --Collars --Special Paint --Guided load columns --Extended load columns --Chained travel stops --Jacking Bolts --Type F PTFE, 25% glass filled
  • Attachment to structures / travel stops
  • Travel Stops
  • Back of a Can, Horizontal with Rod and Hex nuts Coil Adjustment
  • Let’s look at the average life expectancy of a spring hanger: An unprotected spring hanger will last anywhere between fifteen (15) and twenty (20) years. If the hardware is galvanized, which is PT&P’s standard, the spring hanger will last between fifteen (15) and thirty (30) years. And if the springs are coated with Neoprene, it will last fifteen (15) to thirty (30) years. Corrosion and fatigue are the main factors that contribute to the deterioration of a spring hanger assembly.
  • If the piping system has inadequate support, static loads can cause multiple problems, like: Leaking flanges Pump and turbine problems, mainly concerning the bearings, seals and misalignment of flanges Sagging lines and/or liquid trapped in low sections And an increase in system stresses can result in piping failures as well
  • In the case you want to use your existing spring support, re-calibration is an option as long as the support is a constant spring support, in good operating condition, has an operating load range greater than fifteen thousand (15,000) pounds and the cost of field time and equipment is less than the cost of a new spring hanger.
  • LEFT PIC: Constant Support in Jamaica-Travel Pin is Rusted and Decayed
  • A few thoughts during shutdown: Are the lines and equipment temporarily supported while repairs are being made? To prevent having to readjust the spring, I need to re-install the travel stops. If the name plate is missing, stencil the proper installed and operating positions or provide loads for re-calibration.
  • Remove this slide… does not flow when talking about services and then stopping and switching to an example
  • Since we don’t have much time this evening, you may want to check out our website; there you will find a plethora of technical information, including different Tests we carry out, FEA Analysis, and much more.
  • That concludes our Webinar on Constant Spring Supports…. I hope everyone enjoyed the presentation and as a reminder, we have a staff of experts standing by to answer any questions you may have. You can just chat them now while in session until the end of the hour, you can also send them to us by e-mail at


  • 1. Piping Technology & Products, Inc. Constant Spring Supports Webinar and wholly owned subsidiaries: US Bellows Sweco Fab Pipe Shields Anchor/Darling Ent. Presents: Constant Spring Supports Webinar Attention Attendees : to listen to the audio portion, check that your speakers or headset are on and turned up OR dial the number and use the access code listed in your confirmation email. Attention P.E.’s : this Webinar is worth 1 PDH credit for TX P.E.’s (send request to [email_address] )
  • 2. 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
  • 3. Spring Hanger Design 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  Basic Steps in Design
  • 4. Constant Characteristics 1.) Large thermal movements, with standard designs up to 14" and custom designs 36" or greater 2.) No difference in the supported load from the installed to the operating condition
  • 5.
    • Maximum Variation: 6%
    • Available Load Adjustment: +/- 10%
    • Supported Load Always Remains Steady
    Constant Spring Supports Working Principle
  • 6. Constant Design Parameters
    • Configuration
      • PTP-100 (Vertical)
      • PTP-200 (Horizontal)
    • Size
      • 1-100+
    • Type
      • PTP-100
        • Types: A, B, C, D, E, F, G, U
      • PTP-200
        • Types: A, B, C, D, E, F, U
  • 7. Constant Information Sheet
  • 8. Constant Configuration PTP-100 Constant PTP-200 Constant PTP-100 vs. PTP-200
    • Vertical orientation
    • Compact design
    • Less rotation inertia
    • Horizontal orientation
    • Easier placement & adjustment
    • High degree of flexibility
  • 9. Spring Size & Load Capacity Height O.D. Wire Dia. Pitch
  • 10. Frame Size & Load Capacity The cam/coil combination determines the load carrying capability.
  • 11. 100-A 200-A PTP-100 vs. PTP-200 Type A
  • 12. 100-B 200-B PTP-100 vs. PTP-200 Type B
  • 13. 100-C 200-C PTP-100 vs. PTP-200 Type C
  • 14. 100-D 200-D PTP-100 vs. PTP-200 Type D
  • 15. 100-E 200-E PTP-100 vs. PTP-200 Type E
  • 16. 100-F (Layout A) 200-F 100-F (Layout B) PTP-100 vs. PTP-200 Type F
  • 17. 100-U 200-U PTP-100 vs. PTP-200 Type U
  • 18. 100-G PTP-100 vs. PTP-200 Type G
  • 19. Given the Following Design Parameters: a.) Operating Load: 3000 lb. b.) Actual Travel: 4 ⅜“ up Step 1: Determine Total Travel: Rounded up to nearest ½&quot; a.) When Actual Travel is < 5&quot; Total Travel = Actual Travel + 1&quot; b.) When Actual Travel is ≥ 5&quot; Total Travel = Actual Travel + 20% Rounded up to nearest ½&quot; Example: Total Travel = 4 ⅜&quot; + 1&quot; = 5 ⅜&quot; 5 ½&quot; Constant Spring Supports Spring Sizing
  • 20. Step 2: Review Load and Travel Table Chart Final Answer: Size 41 Constant Spring Supports Spring Sizing
  • 21. Constant Information Sheet
  • 22. Test Procedure: Constant Effort Hangers Constant fitted to press Installation Position Travel Stop Removal
  • 23. Test Procedure: Constant Effort Hangers Stage #1 Installed Position Midpoint of Travel Operating Position
  • 24. Test Procedure: Constant Effort Hangers Stage #5 Ascending Midpoint Ascending Installed
  • 25. Test Procedure: Constant Effort Hangers Load Adjustment Tagging
  • 26.
    • Load Flange
    • Load Tag: Both Hot (red) and Cold (white) Movement
    • Installation Instructions
    • Travel Stops
    • Hot-Dipped Galvanized
    • Adjustable Load Column (F-Can)
    • Pre-Loaded
    • +/- 10% Load Adjustment
    Constant Spring Supports Standard Features
  • 27. Attachments Travel Stops “ Big Ton” Custom Constants Coating & Mobility
  • 28. Installation - Constants Structural Attachment
  • 29. Installation - Constants Installation of Assembly Components
  • 30. Installation - Constants Remove or Disengage Travel Stops
  • 31. Installation - Constants Adjustment: Load change is less than +/- 10%
  • 32. Average life expectancy of: 10 years 20 years 30 years Unprotected Spring Hanger Galvanized Hardware Neoprene Coated Springs Useful Life of a Spring Hanger Maintenance – Life Expectancy
  • 33.
    • Leaking flanges
    • Continued pump & turbine problems related to bearings, seals and misalignment.
    • Sagging lines and liquid trapped in low sections
    • Increased system stresses resulting in potential piping failures.
    Due to inadequate support of a piping system, static loads can cause problems, such as: Maintenance Static Loads
  • 34.
    • Visually inspect each Constant hanger:
      • Search for signs of visual cracks, fractures, and corrosion of the spring casing and the following:
        • (1) beam attachment
        • (2) pin
        • (3) constant hanger attachment
        • (4) pipe clamp attachment
        • (5) weldless eye nut
        • (6) threaded rod
        • (9) spring coil
        • (10) Check to see if Travel Stops are removed
      • Check (7) turnbuckle (if present), lock nuts (8) and other threaded items to ensure they are secured and fastened
      • Compare the position of the (10) coil with the hot/cold load indicator and operating range of the spring
      • Check the mobility of the (11) load column
    Before and After Picture of Constant Load Support that Was Resized Maintenance - Inspection
  • 35.
    • Re-calibration :
      • Spring hanger missing a name plate
      • Operating load range > 15,000 lb.
      • Spring is in good operating condition
      • Cost of field time & equipment required is less than the cost of new spring hanger
    Re-calibration Criteria
  • 36. Maintenance
    • Regulation Criteria
      • If within total travel range
      • The hanger can be adjusted to the hot/operating load position
      • Consider the position of rod (swing angle also)
      • Consider adjustment of load (+/- 10%)
  • 37. On-Site Survey & Inspection – Constant Spring
    • Replacement Criteria:
      • Signs of excessive corrosion or fatigue
      • Rust damage of entire unit
      • Modifications to operating conditions
      • Consider condition of components (cam mechanisms, bearings, etc.)
  • 38.
    • Field Examples
    Maintenance - Replace
  • 39.
    • Lines/equipment must have a temporary support while repairs are made
    • Re-install travel stops when the line is taken out of operation (shutdown) to prevent line/equipment movement and possible readjustment of the springs
    • 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
    • Remove spring hanger assembly
    Shutdown/Isolation Procedures
  • 40. Value-Added Services
      • Piping, pipe support and structural design
      • 3D modeling technology
      • Pipe Stress Analysis
        • ANSYS
      • Finite Element Analysis
        • Special stress/thermal problems
        • Pro/E for 3-D Part Design
        • ANSYS for Mesh Generation + Analysis + Results Analysis
      • Field Testing
     Engineering & Design Department
  • 41. Value-Added Services
    • On-site installation guidance
    • On-site inspection/maintenance of pipe supports
    • On-site snubber inspection
    • A system of stock standard Items
    • “ On-call” engineering team
    • Available 24x7
    PT&P’s “On-call” engineering team guarantees a response time of 30 minutes  Field Services & Emergency Services
  • 42. Friday, 5:30pm Saturday Sunday Value-Added Services 24x7 Emergency Service for a 48&quot; Expansion Joint
  • 43. Cold Shoe Testing Constant Testing Marinite Slide Plate Testing Spring Load Testing Anchor Shoe Testing Value-Added Services Product Testing
  • 44.
    • > 30,000 spring coils
    • > 1 million Lb. of standard items
    • Full year supply of beam, angle, plates, rods…etc.
    At Piping Technology & Products, we stock: Value-Added Services Inventory & Stocking Capabilities
  • 45. 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
  • 46. Thank You for Attending… PT&P Webinar: Constant Spring Supports Please send any additional questions or inquiries to [email_address] Useful Links:
    • Online Quote:
    • Online Catalog:
    • Technical Webinars:
    • Blog: