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 About Us  Contact Us  Ordering  Conditions of Sale

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