How To Select and Order

The first step in selecting the proper expansion joint assembly is to collect and organize as much information regarding the design and operating parameters of the system as possible. As a minimum the following information should be provided:

• Size of the line.

• Design pressure.

• Design temperature.

• Design movements and required cycle life.

• Overall length requirement, if any.

• Type of end connections.

• Bellows material.

• Pipe material.

• Flange specification and material.

• Type of expansion joint.

• Accessories.

EXAMPLE

1. Assume the following expansion joint design criteria:

a) Line size: 12-inch nominal diameter.

b) Design/operating pressure: 125 psig.

c) Design/operating temperature: 353°F.

d) Movements/cycle life

Installation: 0.25-inch compression; 0.25-inch extension.

Start-up/shut down: 6.0 inches compression; 250 cycles.

Operating: 1.0-inch compression; 2500 cycles.

e) End connections: 150 lb ANSI raised face slip-on flanges: ASTM A-105 (carbon steel).

f) Bellows material: B-168/lnconel 600.

g) Type: Single.

h) Accessories: Drain and purge.

2. Turn to the Conversion Factor Graph, and calculate equivalent catalog movements.

Total = 5.80

3. Refer to page 93, 12-inch nominal diameter single X-Flex expansion joints, and go to the lowest pressure rating that is equal to or greater than specified design pressure (125 psig) which will be the 150 psig rated expansion joints. Compare the total equivalent catalog movements to those shown in the catalog, keeping in mind that the tabulated movements shown in the catalog are for 1,000 cycles for one movement only.4. Select the appropriate expansion joint that meets the movement criteria. Since the total equivalent axial movement is 5.80-inches, the unit that is rated for eight inches is the correct selection.5. Include the designations for the type (XS for XFlex/single), drain connection (D), and purge connection (P).

6. The resulting PT&P part number would then be as follows: