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Bellows Install Instructions

Untitled Document

Metal Bellows Expansion Joints have been designed to absorb a specified amount of movement by flexing of the thin-gauge convolutions. If proper care is not taken during installation, it may reduce the cycle life and the pressure capacity of the expansion joints which could result in an early failure of the bellows element or damage the piping system. The following recommendations are included to avoid the most common errors that occur during installation. When in doubt about an installation procedure, contact the manufacturer for clarification before attempting to install the Expansion Joints
  • Inspect for damage during shipment, i.e., dents, broken hardware, water marks on carton, etc.
  • Store in clean dry area where it will not be exposed to heavy traffic or damaging environment.
  • Use only designated lifting lugs.
  • Make the piping system fit the expansion joint by stretching, compressing, or offsetting the joint to fit the piping. It may be over stressed when the system is in service.
  • It is good practice to leave one flange loose until the expansion joint has been fitted into position. Make necessary adjustment of loose flange before welding.
  • Install joint with arrow pointing in the direction of flow.
  • Install single Van Stone liners pointing in the direction of flow. Be sure to install a gasket between the liner and Van Stone flange as well as between the matting flange and liner.
  • With telescoping Van Stone line, install the smallest I.D. liner pointing in the direction of flow.
  • Remove all shipping devices after the installation is complete and before any pressure test of the fully installed system.
  • Remove any foreign material that may have become lodged between the convolutions.
  • Refer to EJMA Standards for proper guide spacing and anchor recommendations.
  • Do not drop or strike carton.
  • Do not remove shipping bars until installation is complete.
  • Do not use hanger lugs as lifting lugs without approval of manufacturer.
  • Do not use chains or any lifting device directly on the bellows or Bellows cover.
  • Do not allow weld splatter to hit unprotected bellows. Protect with wet chloride-free asbestos.
  • Do not use cleaning agents that contain chlorides.
  • Do not use steel wool or wire brushes on bellows.
  • Do not force-rotate one end of an expansion joint alignment of bolt holes. Ordinary bellows are not capable of absorbing torque.
  • Do not hydrostatic pressure test or evacuate the system before proper installation of all guides and anchors.
  • Pipe hangers are not adequate guides.
  • Do not exceed a pressure test of 1-1/2 times the rated working pressure of the expansion joint.
  • Do not use shipping bars to retain the pressure thrust if tested prior to installation.


The manufacturer's warranty may be void
if improper installation procedures
have been use.

To help us provide you with the best Expansion Joint for the service intended and at the lowest possible cost, please use the following checklist.

  1. Specify style (SLP, SMP, S-1, LMP etc.) if determined.
  2. Quantity required.
  3. Pipe Size - size of existing pipe.
  4. Installed Face to Face dimensions
  5. End Connections - advise type of end, alloy and method of attachment for each end. Also, specify drilling pattern, number of bolt holes, bolt circle and flange O.D. for flange connections.
  6. Medium Conveyed - type of liquid, gas vapor etc.
  7. Pressure and/or vacuum ranges
  8. Temperature range
  9. Movements-minimum and maximum axial compression, extension and lateral deflection. Also, angular rotation if applicable.
  10. Liners and/or covers
  11. Control Units - control units are recommended for use with all Expansion Joints. For the small additional charge, safety and longevity are enhanced. They must be used when piping support is insufficient.
  12. Other conditions which will help us provide the best possible Expansion Joint for hte service. A complete range of standard products as well as special constructions are available to serve every possible need.


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