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In-Line Seismic Expansion Joint

Travel Required

Anchor Forces

Table 1 Thermal Expansion

Tables 2 Pressure and Force Data

Table 3 Intermediate Guide Spacing

Materials of Construction & Dimensional Data

Table 4 Dimensional Data

Ordering Instructions

Table 5 Type 3501 & 3502 150 psig Design Data

Table 6 Type 3505 & 3506 150 psig Design Data

Table 7 Type 3501 & 3502 300 psig Design Data

Table 8 Type 3505 & 3506 300 psig Design Data

In-Line Pressure Balanced Expansion Joints

Table 9 Type 3501PB & 3502PB 150 psig Design Data

Table 10 Type 3501PB & 3502PB 300 psig Design Data

Installation Procedure

Five Year Limited Warranty

Series 3500
Externally Pressurized Expansion Joints

Series 3500 Externally Pressurized Expansion Joints are designed for installations where the principal movement is axial. 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.

Standard in-line pressure balanced configurations are available 2” through 24” NPS with 4”, 6” & 8” axial travel rated for 150 & 300 psig to 500°F.

The bellows element of Series 3500 Expansion Joints is completely enclosed and externally pressurized whichprevents damage to the bellows and eliminates pressure instability. The pipe telescopes into the expansion joint protecting the bellows and providing a smooth full bore interior. Series 3500 products are available from stock and have a Five year full replacement warranty.

Externally Pressurized Expansion Joint


Type 3502 Cut-a-way

Series 1500 Laminated Bellows Expansion Joints are comparable products that are available for steel pipe systems 2” through 14” with 2” or 3” travel.

Series 8500 Expansion Compensators are comparable products that are available in smaller diameters. Steel pipe and copper tube configurations
available with travels of 2” or 3”.

Series 9500 Alignment Guides are used adjacent to Series 3500 expansion joints and as intermediate guides throughout pipe and tube runs. Standard configurations 3/4" through 14" nominal pipe and copper tube sizes are available.

Series 3500 Expansion Joint


Catalog 574 pdf 4.1 MB
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Canadian Registration
This product is registered throughout Canada under CRN 0D9278.59870YTNADD3

Seismic Expansion joint


Catalog 3500 IS pdf 108 KB
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Series 3500 IS 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 to provide in-line axial and lateral movements of +/- 6”, +/- 12”, +/-18” or +/- 24”.  This rugged reliable product provides seismic isolation of piping without a change in direction or the addition of pipe length.   

Copyright © Hyspan Precision Products, Inc. 2005. All rights reserved.
Hyspan ® is a registered trademark.