3501-3506 Single & Dual 3 Ply Ext. Pres. 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.

• 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.

Hyspan products are available from Sales Representatives and Distributors, or they can be purchased direct from the factory. The minimum factory order for open account customers, COD shipments, or bank card sales is $100.00 (USD). All major credit or debit cards are accepted. The minimum order for new account applicants is $100.00. Our Confidential Credit Application can be downloaded and forwarded to Hyspan for processing. All orders are subject to the following Terms and Conditions, and the above warranty applies to all material. Please read these documents.

Terms and Conditions

Confidential Credit Application (13.9 KB), can be completed on line.