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Engineered Spring Supports Webinar - September
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Engineered Spring Supports Webinar - September

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  • Note: This particular spring can has a cut-away view for demonstration purposes
  • Note: We use double-point suspension instead of single-point suspension
  • Note: Other vendors supports—not PT&P
  • Note: Other vendors supports—not PT&P
  • Note: Other vendors supports—not PT&P
  • Note: Other vendors supports—not PT&P
  • Note: In the case you want to use your existing spring support

Engineered Spring Supports Webinar - September Engineered Spring Supports Webinar - September Presentation Transcript

  • Piping Technology & Products, Inc. Engineered Spring Supports Presents
  • Who is PT&P
    • Pipe Shields, INC.
    • Insulated Pipe Support
    • Commercial & Light industrial
    • Heavy Industrial - based on Mounted, Anchors
    • Pipe Riser Clamps
    • Fronek A/D E.
    • Hydraulic Snubbers
      • Short strut
      • Adjustable strut
    • Mechanical Snubbers
    • dynA/Damp Compensating Strut
    • ASME Nuclear Qualified
    • SWECO FAB, INC.
    • Pressure Vessels
    • Pig Launchers/Receivers
    • Spectacle/Line Blinds
    • Instrument Supports
    • ASME/Misc. Fabrication
    • ASME U-Stamp
    • U.S. Bellows, INC.
    • Metallic Expansion Joints
    • Thin-wall, Thick-wall
    • Rectangular Expansion Joints
    • Fabric Expansion Joints
    • Slip-type
    • Member of EJMA
    • 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
    • Member of MSS, SPED, APFA
  • Engineered Spring Supports Introduction
  • Engineered Spring Supports Introduction
    • A device designed to support a specified load - weight of the pipe, commodity, flanges, valves, refractory & insulation through the install to operating thermal deflection cycle.
  • Engineered Spring Supports Types
    • Variable spring support
    • Variable hanger
    • Constant load hanger
    • Counterweight
  • Variable Spring Supports
    • Variables use coiled springs to support a load and allow movement
    • The resistance of the coil to a load changes during compression, which is why these devices are called “variables”
    • There are many different designs for variable supports and a particular nomenclature used to identify them
  • Variable Spring Supports Type A
    • Type A
    • Furnished with a threaded bushing in the top plate, providing for a simple rod attachment for the upper connection
  • Variable Spring Supports Type B & C
    • Type B & C
    • Furnished with one or two lugs welded to the top cap plate of the casting
    Type B Type C
  • Variable Spring Supports Type D
    • Type D
    • Permits adjustment from the top, by turning the nuts on the hanger rod against a piece of tubing
    • Tubing is securely welded to the spring cap
    • Spring is set above the supporting steel
  • Variable Spring Supports Type E
    • Type E
    • Permits rod adjustment from either above or below the spring
    • Spring is set above the supporting steel or can be welded directly to the supporting steel from below
  • Variable Spring Supports Type F
    • Type F
    • Designed to support piping from below, directly from the floor or supporting steel
    • Adjustment is made by inserting a bar into holes in the load column and turning the load column as a jack screw
    • Base plate is bolted to the case and has four holes for fastening
    Custom Designed Type F Variables
  • Variable Spring Supports Type G
    • Type G
    • spring support assembly is formed by welding two standard spring assemblies to the ends of a pair of channels.
    • can accommodate unusually heavy loads
    • adaptable for avoiding interference in spaces where headroom is limited.
    • can be furnished with center-to-center dimensions
  • Spring Loading/Assembly 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
  • Spring Loading/Assembly 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
  • Spring Loading/Assembly 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
  • Constant Spring Supports Introduction
    • Used when large amounts of thermal deflections are involved (2” or more) and around sensitive rotating equipment where a load variation could be harmful.
  • Constant Spring Supports Horizontal
    • Horizontal Constants
    • Spring can aligns horizontally
    • Permits movements vertically
  • Constant Spring Supports Vertical
    • Vertical Constants
    • Spring can aligns vertically
    • Permits movement vertically
    Vertical Constant in the Field
  • Constant Spring Supports Upthrust
    • Upthrust Constants
    • Permits vertical movement only
    • Spring can aligns vertically or horizontally
  • Big Ton Spring Supports
    • Custom designed to meet load & travel requirements using a multiple coil system
    • Custom designed height, width and length to meet space requirements
    • Used for very large loads
    • Usually a base-mounted support that can be designed with slide plates for lateral pipe movement
  • Design
    • 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
    • Physical clearances of hanger components with piping and structure
    Pipe Hangers are designed to control:
  • Basic Steps in Hanger Design
    • Determine hanger locations
    • Calculate hanger loads due to piping weight
    • Calculate the thermal movement of the piping at each hanger location
    • Select hanger type
    • Check clearances
  • Installation Guidelines
    • Securely attach the spring to the existing structure per the spring support design
  • Installation Guidelines
    • If required, attach hanger rod to the fabricated load column/turnbuckle
  • Installation Guidelines
    • Attach other related hardware
    • constant in the field with rod, turnbuckle, and
    • weldless eye nut 
  • Installation Guidelines
    • After hydro-testing (if applicable), then remove travel stops
    • Variable in the field with
    • the travel stops removed 
  • Installation Guidelines
    • Set the load indicator to the desired setting (cold/hot load)
  • Useful Life of a Spring Hanger
    • Unprotected spring hanger
    • = 15 to 20 years
    • Galvanized hardware
    • = 15 to 30 years
    • Neoprene coated springs
    • = 15 to 30 years
    Average life expectancy of: Corrosion and fatigue are the main factors that contribute to the deterioration of the spring coil
  • Maintenance
    • 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:
  • Inspection Criteria
    • Visually inspect each spring hanger in accordance with the ten point operational integrity check
    • Tag each spring hanger as good, adjust, or replace
    • Issue a field summary report
    • Ten Point Operational Integrity Check:
    • Beam attachment
    • Beam attachment pin
    • Spring hanger attachment
    • Load flange movement
    • Spring coil corrosion
    • Check load indication for hot load
    • Note load deviations
    • Turnbuckle/locknuts
    • Threaded rod/weldless eye, hex nuts
    • Pipe clamp attachment pin
  • Field Examples/Tips No load indicator
  • Field Examples/Tips 2 x 4 still under pipe Not Set correctly
  • Field Examples/Tips Slide plate not attached to load flange Out of adjustment Still has a travel stop
  • Field Examples Corroded cans should be replaced Cans are not supporting load
  • Replacement Criteria
    • Replacement:
    • Spring hanger has no useful life remaining due to corrosion and fatigue
    • Rust damage makes it necessary to replace threaded rods, bolts, pipe attachments, etc..
    • Equipment to be supported has been modified/changed from its original design
  • Re-calibration Criteria
    • Re-calibration:
    • Spring hanger missing a name plate
    • Operating load range > 15,000 lb.
    • Constant spring support
    • Spring is in good operating condition
    • Cost of field time & equipment required is less than the cost of new spring hanger
  • Adjustments After Inspection
    • Spring hangers can be set to desired position by turning the turnbuckles/load column
    • When nameplates are present indicating design hot load, adjustments can be made during operation
    • When nameplates are present indicating design cold load, adjustments can be made during shutdown (provide supported load has not changed)
  • Shutdown/Isolation Procedures
    • 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
  • Conclusion
    • Remember: When selecting springs, determine the location of the hanger, calculate the hanger load and the thermal movement of the piping at the location
    • For optimum performance, follow the installation guidelines from attaching the spring to the existing structure to setting the load indicator
    • When inspecting springs: Utilize the 10 Point Operational Integrity Check to make sure your springs are in good working order
    • * Call a PT&P field services representative if you need
    • assistance!
    • Plan now to replace damaged and/or improperly sized springs that could ultimately lead to catastrophic failure
  • Thank You for joining PT&P’s Engineered Pipe Support Webinar Please forward any additional questions or inquiries to us at info@pipingtech.com or visit our website at www.pipingtech.com