These effective areas are valid only when used with

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Unformatted text preview: o the attention of the purchaser. 1.6 ORIFICE AREAS AND DESIGNATIONS Pipe Flanges and Flanged Fittings ValvesÑFlanged, Threaded, and Welding End The standard effective oriÞce areas and the corresponding letter designations are listed in Table 1. These effective areas are valid only when used with the sizing equations contained in API RP 520, Part I. 1American Society of Mechanical Engineers, 345 East 47th Street, New York, New York 10017. 2American National Standards Institute, 11 West 42nd Street, New York, New York 10036. 3NACE International, P.O. Box 218340, Houston, Texas 77218. 1 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 2 API STANDARD 526 Table 1—Standard Effective Orifice Areas and Letter Designations Designation Effective OriÞce Area (square in.) D 0.110 E 0.196 F 0.307 G 0.503 H 0.785 J 1.287 K 1.838 L 2.853 M 3.60 N 4.34 P 6.38 Q 11.05 R 16.00 T 26.00 2 Design 2.1 GENERAL Pressure relief valves discussed in this standard shall be designed and manufactured in accordance with the applicable requirements of Section VIII of the ASME Boiler and Pressure Vessel Code for pressure relief devices. 2.2 DETERMINATION OF EFFECTIVE ORIFICE AREA The minimum required effective oriÞce area shall be determined in accordance with API RP 520, Part I. 2.3 VALVE SELECTION For valves described in this standard, inlet and outlet ßange sizes and pressure-temperature ratings shall conform to the data in Tables 2 Ð 15 for spring-loaded valves and Tables 16 Ð 29 for pilot-operated valves. Inlet and outlet pressure limits are governed by the ßange pressure/temperature limits or by the manufacturerÕs design limits, whichever is lower. 2.4 DIMENSIONS Center-to-face dimensions shall be in accordance with Tables 2 Ð 15 for spring-loaded valves and Tables 16 Ð 29 for pilot-operated valves, with tolerances of plus or minus 1Ú16 in. for valve inlet sizes up to and including 4 in., and plus or minus 1Ú8 in. for...
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