Expansion Joint Specifications

Standard Sizes

Standard Pressure Ratings

Design of Expansion Joint Construction

Nominal Pipe Size I.D. of Exp. Joint

Series A Pressure Design 9030

Series B Pressure/Vacuum Design 9060

Series C High Pressure Design 9060 H.P.

Inches

Positive PSIG

Negative (in.Hg.)

Positive PSIG

Negative (in.Hg.)

Positive PSIG

Negative (in.Hg.)

1 to 4

5 to 12

14

165

140

85

26

26

15

140

140

65

26

26

26

200

190

130

26

26

26

16 to 20

22 to 24

26 to 40

65

65

55

15

15

15

50

45

45

26

26

26

110

100

90

26

26

26

42 to 66

55

15

40

26

80

26

72 to 84

45

15

40

26

70

26

NOTE: FOR HIGHER PRESSURES CONSULT FACTORY.

Pressure Terminology

1. Operating Pressure: The actual pressure at which the system works under normal conditions. This pressure may be positive or negative(vacuum).

2. Design Pressure: The highest or most severe pressure expected during operation. Sometimes used as the calculated operating pressure plus an allowance for safety margin.

3. Surge Pressure: Operating pressure plus the increment above operating pressure that the expansion joint will be subjected to for a very short time duration due to pump starts, valve closings, etc.

4. Maximum Allowable Working Pressure: This term is used to define the maximum continuous operating pressure recommended for a specific expansion joint.

5. Test Pressure: The hydrostatic test pressure used to demonstrate system capability. Normally 1.5 times maximum allowable working pressure.

Manufacturers of Elastomeric Products

Mechanical Packings . Condenser Expansion Joints . Specialty Seals . Custom Molding

Flexible Bus Duct Connectors Marvel Gauge Glass Washers Rubber Expansion Joints for Piping Systems Flexible Turbine to Condenser Connectors for the Power Industry. Belt Type (Dogbone) Flanged Type (Internal or External) U-Rings -Standard/Flared Rubber and Fabric Dogbone Expansion Joints

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33 Shady Street, Paterson, New Jersey 07524