1、Flanged Steel Pressure-relief ValvesAPI STANDARD 526SIXTH EDITION, APRIL 2009ERRATA, MAY 2009ERRATA 2, OCTOBER 2012Flanged Steel Pressure-relief ValvesDownstream SegmentAPI STANDARD 526SIXTH EDITION, APRIL 2009ERRATA, MAY 2009ERRATA 2, OCTOBER 2012Special NotesAPI publications necessarily address pr
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9、ise, without prior written permission from the publisher. Contact the Publisher, API Publishing Services, 1220 L Street, N.W., Washington, D.C. 20005.Copyright 2009 American Petroleum InstituteForewordThis standard is a purchase specification for flanged steel pressure-relief valves including direct
10、 spring-loadedpressure-relief valves and pilot-operated pressure-relief valves.Nothing contained in any API publication is to be construed as granting any right, by implication or otherwise, for themanufacture, sale, or use of any method, apparatus, or product covered by letters patent. Neither shou
11、ld anythingcontained in the publication be construed as insuring anyone against liability for infringement of letters patent.This document was produced under API standardization procedures that ensure appropriate notification andparticipation in the developmental process and is designated as an API
12、standard. Questions concerning theinterpretation of the content of this publication or comments and questions concerning the procedures under whichthis publication was developed should be directed in writing to the Director of Standards, American PetroleumInstitute, 1220 L Street, N.W., Washington,
13、D.C. 20005. Requests for permission to reproduce or translate all or anypart of the material published herein should also be addressed to the director.Generally, API standards are reviewed and revised, reaffirmed, or withdrawn at least every five years. A one-timeextension of up to two years may be
14、added to this review cycle. Status of the publication can be ascertained from theAPI Standards Department, telephone (202) 682-8000. A catalog of API publications and materials is publishedannually and updated quarterly by API, 1220 L Street, N.W., Washington, D.C. 20005.Suggested revisions are invi
15、ted and should be submitted to the Standards Department, API, 1220 L Street, NW,Washington, D.C. 20005, standardsapi.org.iiiContentsPage1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
16、. . . . 12 Normative References. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Terms and Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17、 . . . . . . . . . . . . . . . 14 Responsibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Conflicting Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Orifice Areas and Designations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37.2 Determination of Orifice Area . .
20、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37.3 Valve Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37.4 Dimen
21、sions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37.5 Lifting Levers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22、. . . . . . . . . . . . . . . . 37.6 Special Construction Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38.2 Spring-loaded Pressure-relief Valves . . . . . . . . . .
24、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48.3 Pilot-operated Pressure-relief Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 Inspection and Shop Tests. . . . . . . . . . . . .
25、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49.1 Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49.2 Set Pressure Test
26、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59.3 Seat Leakage Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
27、 . . . . . . 510 Identification and Preparation for Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 510.1 Identification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
28、 . . . . . . . . . . . . . . . . 510.2 Preparation for Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 511 Pressure-temperature Tables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
29、 . . . . . . . . . . . . . . . . . . . . . . . . . 511.1 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 511.2 Temperature Ranges . . . . . . . . . . . . . . . . . . . . . . . . .
30、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 511.3 Maximum Inlet Flange Pressure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 611.4 Outlet Pressure Limit. . . . . . . . . . . . . . .
31、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Annex A Pressure-relief Valve Nameplate Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35Annex B Pressure-temperature Rating Charts . . . . .
32、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36Annex C Bellows Pressure-temperature Requested Rating Factors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39Annex D Valve Selection Examples . . . . . . . . . . . . . . . . . . . . . .
33、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40Bibliography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43Tables1 Standard Effective Orifice Areas and L
34、etter Designations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Spring Materials. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Spring-loaded Pressure-relief Valv
35、es “D” Orifice (Effective Orifice Area = 0.110 in.2) . . . . . . . . . . . . . . . . 74 Spring-loaded Pressure-relief Valves “E” Orifice (Effective Orifice Area = 0.196 in.2) . . . . . . . . . . . . . . . . 85 Spring-loaded Pressure-relief Valves “F” Orifice (Effective Orifice Area = 0.307 in.2) . .
36、 . . . . . . . . . . . . . . 96 Spring-loaded Pressure-relief Valves “G” Orifice (Effective Orifice Area = 0.503 in.2) . . . . . . . . . . . . . . . 10vPage7 Spring-loaded Pressure-relief Valves “H” Orifice (Effective Orifice Area = 0.785 in.2) . . . . . . . . . . . . . . . 118 Spring-loaded Pressur
37、e-relief Valves “J” Orifice (Effective Area = 1.287 in.2). . . . . . . . . . . . . . . . . . . . . . 129 Spring-loaded Pressure-relief Valves “K” Orifice (Effective Orifice Area = 1.838 in.2) . . . . . . . . . . . . . . . 1310 Spring-loaded Pressure-relief Valves “L” Orifice (Effective Area = 2.853
38、in.2). . . . . . . . . . . . . . . . . . . . . . 1411 Spring-loaded Pressure-relief Valves “M” Orifice (Effective Orifice Area = 3.60 in.2) . . . . . . . . . . . . . . . . 1512 Spring-loaded Pressure-relief Valves “N” Orifice (Effective Orifice Area = 4.34 in.2) . . . . . . . . . . . . . . . . 1613
39、Spring-loaded Pressure-relief Valves “P” Orifice (Effective Orifice Area = 6.38 in.2) . . . . . . . . . . . . . . . . 1714 Spring-loaded Pressure-relief Valves “Q” Orifice (Effective Orifice Area = 11.05 in.2) . . . . . . . . . . . . . . . 1815 Spring-loaded Pressure-relief Valves “R” Orifice (Effec
40、tive Orifice Area = 16.00 in.2) . . . . . . . . . . . . . . . 1916 Spring-loaded Pressure-relief Valves “T” Orifice (Effective Orifice Area = 26.00 in.2) . . . . . . . . . . . . . . . 2017 Pilot-operated Pressure-relief Valves “D” Orifice (Effective Orifice Area = 0.110 in.2) . . . . . . . . . . . .
41、 . . . 2118 Pilot-operated Pressure-relief Valves “E” Orifice (Effective Orifice Area = 0.196 in.2) . . . . . . . . . . . . . . . 2219 Pilot-operated Pressure-relief Valves “F” Orifice (Effective Orifice Area = 0.307 in.2) . . . . . . . . . . . . . . . 2320 Pilot-operated Pressure-relief Valves “G”
42、Orifice (Effective Orifice Area = 0.503 in.2) . . . . . . . . . . . . . . . 2421 Pilot-operated Pressure-relief Valves “H” Orifice (Effective Orifice Area = 0.785 in.2) . . . . . . . . . . . . . . . 2522 Pilot-operated Pressure-relief Valves “J” Orifice (Effective Orifice Area = 1.287 in.2) . . . .
43、. . . . . . . . . . . 2623 Pilot-operated Pressure-relief Valves “K” Orifice (Effective Orifice Area = 1.838 in.2) . . . . . . . . . . . . . . . 2724 Pilot-operated Pressure-relief Valves “L” Orifice (Effective Area = 2.853 in.2). . . . . . . . . . . . . . . . . . . . . . 2825 Pilot-operated Pressur
44、e-relief Valves “M” Orifice (Effective Orifice Area = 3.60 in.2) . . . . . . . . . . . . . . . . 2926 Pilot-operated Pressure-relief Valves “N” Orifice (Effective Orifice Area = 4.34 in.2) . . . . . . . . . . . . . . . . 3027 Pilot-operated Pressure-relief Valves “P” Orifice (Effective Orifice Area
45、= 6.38 in.2) . . . . . . . . . . . . . . . . 3128 Pilot-operated Pressure-relief Valves “Q” Orifice (Effective Orifice Area = 11.05 in.2) . . . . . . . . . . . . . . . 3229 Pilot-operated Pressure-relief Valves “R” Orifice (Effective Orifice Area = 16.00 in.2) . . . . . . . . . . . . . . . 3330 Pilo
46、t-operated Pressure-relief Valves “T” Orifice (Effective Orifice Area = 26.00 in.2) . . . . . . . . . . . . . . . 34A.1 PRV Nameplate Nomenclature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35FiguresB.1 Pressure-temperatur
47、e Limits 1 to be Used with Table 3 to Table 30 of This Standard . . . . . . . . . . . . . . . 36B.2 Pressure-temperature Limits 1 to be Used with Table 3 to Table 30 of This Standard . . . . . . . . . . . . . . . 37B.3 Pressure-temperature Limits 1 to be Used with Table 3 to Table 30 of This Standar
48、d . . . . . . . . . . . . . . . 37B.4 Pressure-temperature Limits 1 to be Used with Table 3 to Table 30 of This Standard . . . . . . . . . . . . . . . 38B.5 Pressure-temperature Limits 1 to be Used with Table 3 to Table 30 of This Standard . . . . . . . . . . . . . . . 38C.1 Bellows Pressure-tempera
49、ture Rating Factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39D.1 Bellows Pressure-temperature Rating Factor for Example 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41D.2 Pressure-temperature Limits 1 for Example 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 421Flanged Steel Pressure-relief Valves1ScopeThis standard is a purchase specification for flanged steel pressure-relief valves. Basic requirements are given fordirect spring-loaded pressure-relief va
