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.
Business Model Canvas (BMC)- A new venture concept
Constant Spring Supports Installation & Applications
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2. 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
3. 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
4. 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
5. 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
20. 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" a.) When Actual Travel is < 5" Total Travel = Actual Travel + 1" b.) When Actual Travel is ≥ 5" Total Travel = Actual Travel + 20% Rounded up to nearest ½" Example: Total Travel = 4 ⅜" + 1" = 5 ⅜" 5 ½" Constant Spring Supports Spring Sizing
21. Step 2: Review Load and Travel Table Chart Final Answer: Size 41 Constant Spring Supports Spring Sizing
33. 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
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43. Friday, 5:30pm Saturday Sunday Value-Added Services 24x7 Emergency Service for a 48" Expansion Joint
46. www.pipingtech.com 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
47. PT&P Webinar: Constant Supports Thank You for Attending… 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
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Hello everyone, I would like to welcome you to our Webinar on Variable Spring Supports. 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 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 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.
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&quot; Step 1: Determine Total Travel: a.) When Actual Travel is < 5&quot; Total Travel = Actual Travel + 1&quot; Rounded up to nearest ½&quot; Total Travel = 4 ⅜&quot; + 1&quot; = 5 ⅜&quot; 5 ½&quot; (EXAMPLE) b.) When Actual Travel is ≥ 5&quot; Total Travel = Actual Travel + 20% Rounded up to nearest ½&quot;
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.
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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 Variable 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 info@pipingtech.com, or you can visit our discussion forum and post your question there, just click on the blue graphic labeled “DISCUSSION FORUM” on the left hand side of our home page at www.pipingtech.com
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