pilot operated pressure relief valves n orice

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Unformatted text preview: . . . . . . . . . . Pilot-operated Pressure Relief Valves ÒMÓ OriÞce (Effective OriÞce Area = 3.60 square in.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pilot-operated Pressure Relief Valves ÒNÓ OriÞce (Effective OriÞce Area = 4.34 square in.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pilot-operated Pressure Relief Valves ÒPÓ OriÞce (Effective OriÞce Area = 6.38 square in.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pilot-operated Pressure Relief Valves ÒQÓ OriÞce (Effective OriÞce Area = 11.05 square in.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pilot-operated Pressure Relief Valves ÒRÓ OriÞce (Effective OriÞce Area = 16.00 square in.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pilot-operated Pressure Relief Valves ÒTÓ OriÞce (Effective OriÞce Area = 26.00 square in.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi Copyright American Petroleum Institute Reproduced by IHS under license with API No reproduction or networking permitted without license from IHS Licensee=TECNA/5935100001 Not for Resale, 05/05/2005 09:50:16 MDT 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Flanged Steel Pressure Relief Valves NACE IntÕl3 1 General MR0175-90 1.1 SCOPE This standard is a purchase speciÞcation for ßanged steel pressure relief valves. Basic requirements are given for direct spring-loaded pressure relief valves and pilot-operated pressure relief valves as follows: a. b. c. d. e. 1.3 DEFINITIONS Pressure relief valve terminology is deÞned in API Recommended Practice 520, Part I. OriÞce designation and area. Valve size and pressure rating, inlet and outlet. Materials. Pressure-temperature limits. Center-to-face dimensions, inlet and outlet. 1.4 RESPONSIBILITY The purchaser is primarily responsible for the following: a. Selecting the type of pressure relief valve and the required pressure-temperature ratings. b. Specifying materials that will satisfactorily resist corrosion from the process ßuid and environmental cond...
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