Sample Product Item

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.

• 3-Ply Laminated Bellows for maximum flexibility and minimum spring force in the shortest length
• Very Small Effective Area to Minimize Operating & Test Pressure Force
• Stainless-to-Stainless Bellows to Collar Welds for maximum corrosion resistance at the bellows attachment
• Internal Venting for faster filling and draining, and increased system safety with quick pressure changes
• Over Compression Safety Allowance of 0.5″
• Standard Drain and Plug for System Drainage
• 5-Year Warranty

• The bellows element of Series 3500 Expansion Joints is completely enclosed and externally pressurized
  • This prevents 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.

• Series 3500 expansion joints are designed for
  • properly maintained steam, hot water and chilled water systems.
  • other media that are compatible with the following materials of construction used in these expansion joints
    • Flanges
    • Pipe
    • Guide Rings
    • Drain Port & Plug
    • Bellows

(For further details on the materials used for standard construction refer to Materials of Construction & Dimensional Data.)

• Be certain that the exterior of the expansion joint is not exposed to corrosive substances such as minerals in ground water and road salt.

• Refer to Tables 5 through 10 to select the configuration and service conditions required for your application.
• If the travel required is unknown, see the method of calculation on Page 5 (of the full catalog).

Example
Single Expansion Joint Steel pipe weld ends 150 psig at 500°F maximum 4.0″ axial travel maximum 2″ NPS

3502-131-4

3502: Type specification, steel pipe weld end both ends, steel housing and guides
131: Size & pressure designation, 2″ NPS, 150 PSIG
4: Axial travel, 4.0″ compression, 1.0″ extension

• Single expansion joints, 3501 and 3502, ordered with anchor based are identified as 3501AB and 3502AB.
• Anchor bases are standard on dual anchor base joints, 3505 and 3506, and do not require the AB suffix.
• In-line pressure balanced joints are available as single configurations and identified as 3501PB and 3502PB—refer to In-Line Pressure Balanced Expansion Joints.

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