3501SRV-3502SRV Safety Relief Valve 3 Ply Ext. Pres. Vent Exp. Joint

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.

The rugged in-line construction of the Series 3500 IS seismic expansion joint provides a reliable heavy-duty solution to absorb large multi-plane seismic motions. Designed specifically to connect the piping of two structures that move independently in a seismic event. The design does not require
a change in piping direction and therefore does not add elbows and other components that increase
pressure drop and heat loss. The envelope is minimum to facilitate installations in tight fitting areas
and retrofitting of existing piping installations.

Series 3500 IS expansion joints combine the design techniques of two well established Hyspan products; Hyspan Barco Ball Joints provide lateral offset and rotation, and Hyspan Series 3500 externally pressurized expansion joints provide axial extension or compression. The bellows is enclosed and all component parts are made from standard pipe or equivalent. The installation can be horizontal or vertical as illustrated.

Series 3500 IS seismic expansion joints must be installed between two anchor points that are designed to react to the pressure thrust and bellows spring force of the axial expansion joint, and the lateral force resulting from the flex torque of the ball joints. The maximum lateral force on the anchor is equal to the break away force which is tabulated in Column 5 of Table 1 for the standard designs. After break away, the force is reduced, and it is not a function of pressure. The maximum axial force is a combination of the pressure thrust force which is tabulated in Table 2, Pressure and Force Data, and the Axial Spring Rate that is tabulated in Column 4 of Table 1 multiplied by the axial deflection.

• 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.