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Reference API Recommended Practice 520, Fifth Edition. A = F'A' √ P1 Tw = T1 = Where: A = Minimum required effective discharge area, square inches. A' = Exposed surface area of the vessel, square feet. P1 = Relieving pressure, pounds per square inch, absolute (set pressure [psig] + overpressure [psi] + atmospheric pressure [psia]). 01. 045 should be used. Vessel wall temperature, degrees Rankine. The API recommended maximum wall temperature is 1100F for carbon steel vessels only. Gas temperature at the upstream pressure, degrees Rankine as determined by the following relationship.

Mm. S. S. gallons per minute. 00 at 70F (21C). After the value of R is determined, the factor Kv is obtained from the graph. " If the corrected area exceeds the "chosen effective orifice area," the above calculations should be repeated using the next larger effective orifice size as the required effective orifice area of the valve selected cannot be less than the calculated required effective area. PM6 7 9/22/97, 8:01 AM Chapter 7 Engineering Support Information Crosby Engineering Handbook Capacity Correction Factor for Superheat, Ksh The steam sizing formulae on page 5-6 and 6-6 are based on the flow of dry saturated steam.

C = Coefficient determined from an expression of the ratio of specific heats of the gas or vapor at standard conditions. (Reference Table T7-7 on page 7-26). K = Effective coefficient of discharge. 975. A = Effective discharge area, square inches. Ao = Outlet cross-sectional area, square inches. P1 = Relieving pressure, pounds per square inch, absolute. This is set pressure (psig) + overpressure (psi) + atmospheric pressure (psia). Pa = Atmospheric pressure (psia). k = Ratio of specific heats of the fluid.