1、Pressure Relief DevicesAN AMERICAN NATIONAL STANDARDASME PTC 25-2008(Revision of ASME PTC 25-2001)Performance Test CodesCopyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ASME PTC 25-2008(Revision of
2、 ASME PTC 25-2001)Pressure ReliefDevicesPerformance Test CodesAN AMERICAN NATIONAL STANDARDCopyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-Date of Issuance: January 13, 2009This Code will be revis
3、ed when the Society approves the issuance of a new edition. There will be noaddenda issued to this edition.ASME issues written replies to inquiries concerning interpretations of technical aspects of this Code.Periodically certain actions of the ASME PTC 25 Committee may be published as Cases. Cases
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5、rican 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 madeavailable for public review and comment that provides an opp
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10、t the prior written permission of the publisher.The American Society of Mechanical EngineersThree Park Avenue, New York, NY 10016-5990Copyright 2009 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.Copyright ASME International Provided by IHS under license with ASME
11、Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-CONTENTSNotice . viForeword viiCommittee Roster . viiiCorrespondence With the PTC 25 Committee . ixIntroduction . xPart I General 1Section 1 Object and Scope 11-1 Object 11-2 Scope 11-3 Measurement Uncertainty . 11-4
12、General 1Section 2 Definitions and Description of Terms 32-1 Purpose 32-2 General 32-3 Types of Devices 32-4 Parts of Pressure Relief Devices . 42-5 Dimensional Characteristics Pressure Relief Valves 52-6 Dimensional Characteristics Nonreclosing Pressure Relief Devices . 72-7 Operational Characteris
13、tics of Pressure Relief Devices . 72-8 Description of Terms 8Part II Flow Capacity Testing 11Section 3 Guiding 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 .
14、113-5 Preliminary Tests . 113-6 Spare Instruments 113-7 Calibration of Instruments 113-8 Metering Sections . 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-
15、1 General 154-2 Fluid Conditions, Test Conditions, and Instrumentation 154-3 Testing With Steam, Pressure 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 Disc
16、harging to AtmosphericPressure 244-6 Testing With Steam, With Back Pressure Above Atmospheric . 254-7 Testing With Gas or Air, With Back Pressure Above Atmospheric 274-8 Testing With Liquids, With Back Pressure Above Atmospheric . 29iiiCopyright ASME International Provided by IHS under license with
17、ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-4-9 Testing With Gas or Air, Nonreclosing Pressure Relief Device FlowResistance Method . 304-10 Testing Nonreclosing Pressure Relief Devices to Determine a SetPressure for Incompressible Fluids 31Section 5 Comput
18、ation 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: General Information . 486-3 Part II: Summary
19、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 Part VIII: Graphical Presentation of Back-
20、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 Test Apparatus . 547-5 Preliminary Training
21、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 Testing Procedures . 598-4 Bench Testing P
22、rocedures . 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 Instructions 6310-2 Part I: General Infor
23、mation . 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 . 6310-8 Part VII: Supporting Data . 63ivCopy
24、right ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-Figures2-5-1 Typical Curtain Areas of Pressure Relief Valves 63-9-1 Recommended Arrangements for Testing Nonreclosing Pressure ReliefDevice Flow Resista
25、nce . 134-2.3-1 Recommended Arrangements for Testing Devices With AtmosphericBack Pressure Flowmeter Test Arrangement 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
26、 AtmosphericBack Pressure Weighed-Condensate Test Arrangement 204-2.10-3 Recommended Arrangements for Testing 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 A
27、rrangement for Testing Nonreclosing Pressure ReliefDevices in Combination With Pressure Relief Valves . 214-6-1 Recommended Discharge Arrangements for Testing Devices With Built-UpBack Pressure 264-10-1 Recommended Arrangements for Conducting Opening Test onNonreclosing Pressure Relief Devices With
28、Incompressible Fluids 328-2.2-1 Recommended Arrangement for Testing Valves With CompressibleFluids 578-2.2-2 Recommended 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
29、and Water: Observed Dataand Computed Results Weighed-Water Method 375-5.2 Pressure Relief Device Tested With Steam: 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 De
30、vice Tested With Air or Gas: Observed Data andComputed Results Flowmeter Method . 415-5.5 Pressure Relief Device 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
31、-5.7 Nonreclosing Pressure Relief Device Tested With Air: Observed Dataand Computed Results Flow Resistance 466-5.1 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
32、Test Report: Air, Gas, or FuelGas 526-5.4 Nonreclosing Pressure Relief Device Performance Test Report: Air, Gas, orFuel Gas . 53Mandatory AppendicesI SI (Metric) Units and Conversion Factors 65II Examples of Determining Flow Rate Uncertainties . 67Nonmandatory AppendixA References 71vCopyright ASME
33、International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-NOTICEAll Performance Test Codes must adhere to the requirements of ASME PTC 1, GeneralInstructions. The following information is based on that document and includ
34、ed 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 results of the highest levelof accuracy
35、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 uncer-tainty analysis.When tests are run
36、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 contrac-tual guarantees. Therefore, it is
37、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 interpret how such comparisons shall be
38、 made.viCopyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-FOREWORDIn December 1948, the ASME Boiler and Pressure Vessel Committee recommended to the ASMEPerformance (then Power) Test Codes Committee
39、 that a code be prepared on the testing of safetyand relief valves. This request resulted in the publication of the 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 Commi
40、ttee authorized PTC CommitteeNumber 25 on Safety and Relief Valves to prepare a single test code (PTC 25.2-1966) to covertesting of valves discharging to atmosphere, superimposed, or built-up back pressure. In Marchof 1971, the ASME Performance Test Codes Committee authorized PTC Committee Number 25
41、on Safety and Relief Valves to prepare a general revision to the test code, the result of whichwas PTC 25.3-1976, approved 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 revis
42、ion of the test code. This revision, PTC 25.3-1988, approvedby the ASME Board on Performance Test Codes on March 14, 1988, differed from its predecessorsprimarily by the omission of the section concerning theoretical relieving capacity and coefficientof discharge.In 1991, the ASME Board on Performan
43、ce Test Codes revised the name of PTC CommitteeNumber 25 to “Pressure Relief Devices” and authorized the Committee to 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
44、 of in-service and benchtesting.The previous edition of this Code was approved and adopted by the American NationalStandards Institute as meeting the criteria as an American National Standard on May 25, 2001.This edition of the Code has been broken down into three parts. Each parts title, and Sectio
45、nsincluded within it, are as follows:(a) Part I, “General,” includes Sections 1 and 2.(b) Part II, “Flow Capacity Testing,” includes the preceding Sections 1 and 2, along with Sections3 through 6 and appendices.(c) Part III, “In-Service and Bench Testing,” includes the preceding Sections 1 and 2, al
46、ongwith Sections 7 through 10 and appendices.This Committee invites comments that will be considered for incorporation in future revisions.These should be addressed to Secretary, PTC 25 Committee, ASME, Three Park Avenue, New York,NY 10016-5990.This 2008 edition of PTC 25 was approved by the America
47、n National Standards Institute onSeptember 16, 2008.viiCopyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ASME PTC COMMITTEEPerformance Test Codes(The following is the roster of the Committee at the
48、time of approval of this Code.)STANDARDS COMMITTEE OFFICERSM. P. McHale, ChairJ. R. Friedman, Vice ChairJ. H. Karian, SecretarySTANDARDS COMMITTEE PERSONNELP. G. Albert, General Electric Co.R. P. Allen, ConsultantR. L. Bannister, Member Emeritus, ConsultantJ. M. Burns, Burns EngineeringW. C. Campbel
49、l, Southern Company ServicesM. J. Dooley, Alstom PowerA. J. Egli, Alstom PowerJ. R. Friedman, Siemens Power Generation, Inc.G. J. Gerber, ConsultantP. M. Gerhart, University of EvansvilleW. O. Hays, Honorary Member, RetiredT. C. Heil, Babcock however, they shouldnot contain proprietary names or information.Requests that are not in this fo
