Series 3500 External Pressure Bellows Expansion Joints
Information at a Glance
Series
3500 External Pressure Bellows Expansion Joints
Material
Steel
Size
2″-240″ (50-6000)
Pressure
≤150 & 300 (10 & 20)
Motion
16+” (400)
Canadian Registration
This product is registered throughout Canada under
CRN 0D9278.59870YTNADD3
Other Products
Series 3500 Externally Pressurized expansion joints incorporate a completely enclosed and externally pressurized design to stabilize the bellows, eliminating column instability, commonly called squirm. Bellows lengths can be much longer than internally pressurized designs, increasing performance capabilities.
Additional significant Series 3500 External Pressure design advantages include:
• 3-ply, laminated, bellows for maximum motion and cycle life in a minimum footprint
• Low pressure force
• Minimized spring force
• Stainless to stainless welds at attachment collars for corrosion resistance
• Internal venting for system protection in sudden pressure changes
• Integral alignment guide, (lateral safety stop for 3501SRV-3502SRV)
• Smooth bore pipe liner to protect the bellows ID and minimize pressure drop
These advanced technologies are combined into various configurations to support large axial motions for district energy and plant transmission, pressure balanced axial for systems with low-force structures, inline seismic connectors for extreme seismic or settlement motions, and safety relief valve discharge applications.
Series Products
Series 3501-3506 Externally Pressurized Axial Expansion Joints are designed for axial motion applications. Standard single and dual designs are available 2” through 24” NPS with 4” through 16” axial compression. Service conditions are 150 and 300 psig to 500°F. Welded and flanged end connections are standard, with grooved ends optional.
Series 3501PB-3502PB Externally Pressurized Pressure Balanced Axial Expansion Joints are designed for axial motion applications. Standard single and dual designs are available 2” through 24” NPS with 4” through 16” axial compression. Service conditions are 150 and 300 psig to 500°F. Welded and flanged end connections are standard, with grooved ends optional.
Series 3501IS-3502IS In-line Seismic Expansion Joints combine the axial motion capability and safety of Series 3500 Externally Pressurized Expansions with the universal motion capability and reliability of Hyspan Barco Ball Joints or Gimbal Bellows Joints. Standard sizes range from 2 ½” through 12” NPS. for in-line axial and lateral movements of 6”, 12”, 18” or 24” motion in any direction, rated for 150 psig to 450°F. This advanced reliable product provides seismic isolation, or building settlement, for piping without a change in direction or the addition of pipe length. Welded and flanged end connections are standard.
Series 3501SRV-3502SRV Safety Relief Valve Connectors are designed and manufactured to meet the special requirements of safety relief valve escapement piping for sizes 2” through 12” NPS allowing 2” compression and 1” lateral, rated for 150 psig to 500°F. with ultra-high velocity internal pipe flow liner and a condensate drain. Welded and flanged end connections are standard.
