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    The first step in selecting the proper pipe 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.

Thick Wall Flanged and Flued Head Pipe Expansion Joint


1. Assume the following pipe expansion joint design criteria:

a) Line size: 16-inch nominal diameter.

b) Design/operating pressure: 160 psig.

c) Design/operating temperature: 450° F.

d) Movements/cycle life:

Installation: 0.25-inch compression; 0.125-inch extension; 0.0625-inch lateral; 0° angulation. Start-up/shut down: 1.0-inch compression; 0.25-inch lateral; 0°angulation; 300 cycles. Operating: 0.25-inch compression; 0.063-inch lateral; 1.0° angulation; 10,000 cycles.

e) End connections: 150 lb ANSI raised face slip-on flanges; ASTM A l05 (carbon steel).

f) Bellows material: A-240-T316.

g) Type: Single; unrestrained (i.e. no tie rods, hinge, or gimbal hardware).

h) Accessories: Liner and cover.

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

    Total = 1.13 0.27 1.3

3. Refer to page 54, 16-inch nominal diameter single pipe expansion joints and go to the lowest pressure rating that is equal to or greater than specified design pressure (160 psig). Compare the total equivalent catalog movements to those shown in the catalog, keeping in mind that the tabulated movements in the catalog are for 3000 cycles for one movement only.
4. Select the shortest overall length that by inspection would appear to meet the movement criteria. Use the following formula to determine if the selected overall length is acceptable.



200 psig rating/l 8-inch O.A.L.

1.13 0.27 1.30

2.75 0.69 10.0

5. Since 0.93 is less than 1.0, the 200 psig/l8-inch O.A.L. will meet the criteria for all the movement conditions specified in Step 1.

6. Include the designations for the type (S for single), and liner (L), and cover (C) in the part number. All of the actual movements must be specified when combination ends or covers are specified.

7. On combination end units, the direction of flow must be specified.

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

Part Number Example

Download the Pipe Expansion Joint Part Numbering System Legend and fill out the details.


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