1、Pressure Relief DevicesPerformance Test CodesAN AMERICAN NATIONAL STANDARDASME PTC 25-2014(Revision of ASME PTC 25-2008)ASME PTC 25-2014(Revision of ASME PTC 25-2008)Pressure ReliefDevicesPerformance Test CodesAN AMERICAN NATIONAL STANDARDTwo Park Avenue New York, NY 10016 USADate of Issuance: June
2、17, 2014This Code will be revised when the Society approves the issuance of a new edition.ASME issues written replies to inquiries concerning interpretations of technical aspects of this Code.Interpretations are published on the Committee Web page and under go.asme.org/InterpsDatabase.Periodically c
3、ertain actions of the ASME PTC Committee may be published as Code Cases. Code Casesare published on the ASME Web site under the PTC Committee Page at go.asme.org/PTCcommitteeas they are issued.Errata to codes and standards may be posted on the ASME Web site under the Committee Pages toprovide correc
4、tions to incorrectly published items, or to correct typographical or grammatical errorsin codes and standards. Such errata shall be used on the date posted.The PTC Committee Page can be found at go.asme.org/PTCcommittee. There is an option availableto automatically receive an e-mail notification whe
5、n errata are posted to a particular code or standard.This option can be found on the appropriate Committee Page after selecting “Errata” in the “PublicationInformation” section.ASME is the registered trademark of The American Society of Mechanical Engineers.This code or standard was developed under
6、procedures accredited as meeting the criteria for American NationalStandards. The Standards Committee that approved the code or standard was balanced to assure that individuals fromcompetent and concerned interests have had an opportunity to participate. The proposed code or standard was madeavailab
7、le for public review and comment that provides an opportunity for additional public input from industry, academia,regulatory agencies, and the public-at-large.ASME does not “approve,” “rate,” or “endorse” any item, construction, proprietary device, or activity.ASME does not take any position with re
8、spect to the validity of any patent rights asserted in connection with anyitems mentioned in this document and does not undertake to insure anyone utilizing a standard against liability forinfringement of any applicable letters patent, nor assumes any such liability. Users of a code or standard are
9、expresslyadvised that determination of the validity of any such patent rights, and the risk of infringement of such rights, isentirely their own responsibility.Participation by federal agency representative(s) or person(s) affiliated with industry is not to be interpreted asgovernment or industry en
10、dorsement of this code or standard.ASME accepts responsibility for only those interpretations of this document issued in accordance with the establishedASME procedures and policies, which precludes the issuance of interpretations by individuals.No part of this document may be reproduced in any form,
11、in an electronic retrieval system or otherwise,without the prior written permission of the publisher.The American Society of Mechanical EngineersTwo Park Avenue, New York, NY 10016-5990Copyright 2014 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSNotice . v
12、iForeword viiCommittee Roster . viiiCorrespondence With the PTC Committee ixIntroduction . xPart I General 1Section 1 Object and Scope 11-1 Object 11-2 Scope 11-3 Measurement Uncertainty . 11-4 General 1Section 2 Definitions and Description of Terms 32-1 Purpose 32-2 General 32-3 Types of Devices 32
13、-4 Parts of Pressure Relief Devices . 42-5 Dimensional Characteristics Pressure Relief Valves 52-6 Dimensional Characteristics Nonreclosing Pressure Relief Devices . 72-7 Operational Characteristics of Pressure Relief Devices . 72-8 Description of Terms 8Part II Flow Capacity Testing 11Section 3 Gui
14、ding Principles . 113-1 Items on Which Agreement Shall Be Reached 113-2 Qualification of Person Supervising the Test . 113-3 Responsibility of Person Supervising the Test 113-4 Test Apparatus . 113-5 Preliminary Tests . 113-6 Spare Instruments 113-7 Calibration of Instruments 113-8 Metering Sections
15、 . 123-9 Flow Resistance Test Rigs . 123-10 Adjustments During Tests . 143-11 Records and Test Results 143-12 Measurement Uncertainty . 14Section 4 Instruments and Methods of Measurements . 154-1 General 154-2 Fluid Conditions, Test Conditions, and Instrumentation 154-3 Testing With Steam, Pressure
16、Relief Device Discharging to AtmosphericPressure 184-4 Testing With Gas or Air, Pressure Relief Device Discharging to AtmosphericPressure 234-5 Testing With Liquids, Pressure Relief Devices Discharging to AtmosphericPressure 244-6 Testing With Steam, With Back Pressure Above Atmospheric . 254-7 Test
17、ing With Gas or Air, With Back Pressure Above Atmospheric 274-8 Testing With Liquids, With Back Pressure Above Atmospheric . 29iii4-9 Testing With Gas or Air, Nonreclosing Pressure Relief Device FlowResistance Method . 304-10 Testing Nonreclosing Pressure Relief Devices to Determine a SetPressure fo
18、r Incompressible Fluids 31Section 5 Computation of Results. 345-1 Correction of Measured Variables . 345-2 Review of Instrument Readings . 345-3 Use of Equation Symbols . 345-4 Density . 345-5 Capacity Calculations . 34Section 6 Test Summary Report Form . 486-1 General Instructions 486-2 Part I: Gen
19、eral Information . 486-3 Part II: Summary of Results . 486-4 Part III: Description of Device Under Test . 486-5 Part IV: Observed Data and Computed Results 486-6 Part V: Test Conditions and Corrections Agreements . 486-7 Part VI: Test Methods and Procedures . 496-8 Part VII: Supporting Data . 496-9
20、Part VIII: Graphical Presentation of Back-Pressure Test Results . 49Part III In-Service and Bench Testing . 54Section 7 Guiding Principles . 547-1 Items on Which Agreement Shall Be Reached 547-2 Qualification of Person Conducting the Test . 547-3 Responsibility of Person Conducting the Test 547-4 Te
21、st Apparatus . 547-5 Preliminary Training 547-6 Spare Instruments 547-7 Calibration of Instruments 547-8 Adjustments During Test 557-9 Records and Test Results 557-10 Measurement Uncertainty . 55Section 8 Instruments and Methods of Measurements . 568-1 General 568-2 Instrumentation 568-3 In-Service
22、Testing Procedures . 598-4 Bench Testing Procedures . 618-5 Seat Tightness Test 61Section 9 Computation of Results. 629-1 Correction of Measured Variables . 629-2 Review of Instrument Readings . 629-3 Computation of Operational Characteristics . 62Section 10 Test Summary Report Form . 6310-1 General
23、 Instructions 6310-2 Part I: General Information . 6310-3 Part II: Summary of Results . 6310-4 Part III: Description of Valve Under Test . 6310-5 Part IV: Observed Data and Computed Results 6310-6 Part V: Contract and Agreed Test Conditions Corrections 6310-7 Part VI: Test Methods and Procedures . 6
24、310-8 Part VII: Supporting Data . 63ivFigures2-5-1 Typical Curtain Areas of Pressure Relief Valves 63-9-1 Recommended Arrangements for Testing Nonreclosing Pressure ReliefDevice Flow Resistance . 134-2.3-1 Recommended Arrangements for Testing Devices With AtmosphericBack Pressure Flowmeter Test Arra
25、ngement 164-2.10-1 Recommended Internal Contours of Nozzles, Fittings, Adapter, andReducers Between Test Vessel and Test Device . 194-2.10-2 Recommended Arrangements for Testing Devices With AtmosphericBack Pressure Weighed-Condensate Test Arrangement 204-2.10-3 Recommended Arrangements for Testing
26、Devices With AtmosphericBack Pressure Weighed-Water Test Arrangement 204-2.10-4 Recommended Discharge Arrangements for Testing Devices WithSuperimposed Back Pressure 214-2.10-5 Recommended Arrangement for Testing Nonreclosing Pressure ReliefDevices in Combination With Pressure Relief Valves . 214-6-
27、1 Recommended Discharge Arrangements for Testing Devices With Built-UpBack Pressure 264-10-1 Recommended Arrangements for Conducting Opening Test onNonreclosing Pressure Relief Devices With Incompressible Fluids 328-2.2-1 Recommended Arrangement for Testing Valves With CompressibleFluids 578-2.2-2 R
28、ecommended Arrangement for Testing Valves With IncompressibleFluids 588-3.2-1 Pilot-Operated Pressure Relief Valve Field Test Accessory 60Forms5-5.1 Pressure Relief Device Tested With Steam and Water: Observed Dataand Computed Results Weighed-Water Method 375-5.2 Pressure Relief Device Tested With S
29、team: Observed Data andComputed Results Flowmeter Method . 385-5.3 Pressure Relief Device Tested With Liquids: Observed Data andComputed Results Flowmeter Method . 405-5.4 Pressure Relief Device Tested With Air or Gas: Observed Data andComputed Results Flowmeter Method . 415-5.5 Pressure Relief Devi
30、ce Tested With Air or Gas: Observed Data andComputed Results Sonic-Flow Method . 435-5.6 Pressure Relief Device Tested With Fuel Gas: Observed Data andComputed Results Flowmeter Method . 445-5.7 Nonreclosing Pressure Relief Device Tested With Air: Observed Dataand Computed Results Flow Resistance 46
31、6-5.1 Pressure and Relief Valve Performance Test Report: Steam . 506-5.2 Pressure and Relief Valve Performance Test Report: Liquids and Water . 516-5.3 Pressure and Relief Valve Performance Test Report: Air, Gas, or FuelGas 526-5.4 Nonreclosing Pressure Relief Device Performance Test Report: Air, Ga
32、s, orFuel Gas . 53Mandatory AppendicesI SI (Metric) Units and Conversion Factors 65II Examples of Determining Flow Rate Uncertainties . 67Nonmandatory AppendixA References 72vNOTICEAll Performance Test Codes must adhere to the requirements of ASME PTC 1, GeneralInstructions. The following informatio
33、n is based on that document and included here for emphasisand the convenience of the user of the Code. It is expected that the Code user is fully cognizantof Sections 1 and 3 of ASME PTC 1 and has read them prior to applying this Code.ASME Performance Test Codes provide test procedures that yield re
34、sults of the highest levelof accuracy consistent with the best engineering knowledge and practice currently available.They were developed by balanced committees representing all concerned interests and specifyprocedures, instrumentation, equipment-operating requirements, calculation methods, and unc
35、er-tainty analysis.When tests are run in accordance with a code, the test results themselves, without adjustmentfor uncertainty, yield the best available indication of the actual performance of the tested equip-ment. ASME Performance Test Codes do not specify means to compare those results with cont
36、rac-tual guarantees. Therefore, it is recommended that the parties to a commercial test agree beforestarting the test and preferably before signing the contract on the method to be used for comparingthe test results with the contractual guarantees. It is beyond the scope of any code to determineor i
37、nterpret how such comparisons shall be made.viFOREWORDIn December 1948, the ASME Boiler and Pressure Vessel Committee recommended to the ASMEPerformance (then Power) Test Codes Committee that a code be prepared on the testing of safetyand relief valves. This request resulted in the publication of th
38、e original test code for safety andrelief valves (PTC 25-1958) and was applicable only to tests with atmospheric discharge. InJune 1964, the ASME Performance (then Power) Test Code Committee authorized PTC CommitteeNumber 25 on Safety and Relief Valves to prepare a single test code (PTC 25.2-1966) t
39、o cover testingof valves discharging to atmosphere, superimposed, or built-up back pressure. In March 1971, theASME Performance Test Codes Committee authorized PTC Committee Number 25 on Safety andRelief Valves to prepare a general revision to the test code, the result of which was PTC 25.3-1976,app
40、roved as an American National Standard on August 19, 1976.In 1978, the ASME Board on Performance Test Codes once again authorized the PTC CommitteeNumber 25 to prepare a general revision of the test code. This revision, PTC 25.3-1988, approvedby the ASME Board on Performance Test Codes on March 14,
41、1988, differed from its predecessorsprimarily by the omission of the section concerning theoretical relieving capacity and coefficientof discharge.In 1991, the ASME Board on Performance Test Codes revised the name of PTC CommitteeNumber 25 to “Pressure Relief Devices” and authorized the Committee to
42、 prepare a revised testcode of the same name with a scope that was extended to include a broader range of closingand nonreclosing pressure relief devices and to broaden the discussion of in-service and benchtesting.The 2001 edition of this Code was approved and adopted by the American National Stand
43、ardsInstitute as meeting the criteria as an American National Standard on May 25, 2001.The 2008 edition of this Code was broken down into three parts. Each Parts title, and Sectionsincluded within it, are as follows:(a) Part I, “General,” includes Sections 1 and 2.(b) Part II, “Flow Capacity Testing
44、,” includes the preceding Sections 1 and 2, along withSections 3 through 6 and appendices.(c) Part III, “In-Service and Bench Testing,” includes the preceding Sections 1 and 2, alongwith Sections 7 through 10 and appendices.The 2008 edition of PTC 25 was approved by the American National Standards I
45、nstitute onSeptember 16, 2008.This 2014 edition of PTC 25 was approved by the American National Standards Institute onMay 5, 2014.This Committee invites comments that will be considered for incorporation in future revisions.These should be addressed to Secretary, PTC 25 Committee, ASME, Two Park Ave
46、nue, New York,NY 10016-5990.viiASME PTC COMMITTEEPerformance Test Codes(The following is the roster of the Committee at the time of approval of this Code.)STANDARDS COMMITTEE OFFICERSP. G. Albert, ChairJ. W. Milton, Vice ChairJ. H. Karian, SecretarySTANDARDS COMMITTEE PERSONNELP. G. Albert, General
47、Electric Co.R. P. Allen, ConsultantR. L. Bannister, Honorary MemberJ. M. Burns, Burns EngineeringW. C. Campbell, True North Consulting, LLCM. J. Dooley, Alstom PowerG. J. GerberP. M. Gerhart, University of EvansvilleW. O. Hays, Honorary MemberR. E. Henry, Sargent however, they shouldnot contain prop
48、rietary names or information.Requests that are not in this format will be rewritten in this format by the Committee priorto being answered, which may inadvertently change the intent of the original request.ASME procedures provide for reconsideration of any interpretation when or if additionalinforma
49、tion that might affect an interpretation is available. Further, persons aggrieved by aninterpretation may appeal to the cognizant ASME Committee or Subcommittee. ASME does not“approve,” “certify,” “rate,” or “endorse” any item, construction, proprietary device, or activity.Attending Committee Meetings. The PTC Standards Committee regularly holds meetingsand/or telephone conferences that are open to the public. Persons wishing to attend any meetingand/or telephone conference should contact the Secretary of the PTC Standards Committee.Future Committee meeting dates
