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ASME PTC 25-2014
M00051938
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ASME PTC 25-2014 Pressure Relief Devices
standard by ASME International, 06/17/2014
Full Description
The object of the test is to determine the performance of pressure relief devices. These tests determine one or more of the following:dimensional, operational, and mechanical characteristicsrelieving pressure
relieving flow capacity at test pressure
individual flow resistanceProcedures for conducting the tests, calculating the results, and making corrections are defined.
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Pressure Relief Devices
Performance Test Codes
AN A MERICAN NA TIONAL S T AND ARD
ASME PTC 25-2014
(Revision of ASME PTC 25-2008)
ASME PTC 25-2014
(Revision of ASME PTC 25-2008)
Pressure Relief Devices
Performance Test Codes
AN AMERICAN NA TIONAL S T AND ARD
Two Park Avenue • New York, NY • 10016 USA
Date of Issuance: June 17, 2014
This Code will be revised when the Society approves the issuance of a new edition.
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without the prior written permission of the publisher.
The American Society of Mechanical Engineers Two Park Avenue, New York, NY 10016-5990
Copyright © 2014 by
THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS
All rights reserved Printed in U.S.A.
CONTENTS
Notice vi
Foreword vii
Committee Roster viii
Correspondence With the PTC Committee ix
Introduction x
Part I | General.................................................................... | 1 |
Section 1 | Object and Scope .......................................................... | 1 |
1-1 | Object .................................................................... | 1 |
1-2 | Scope .................................................................... | 1 |
1-3 | Measurement Uncertainty ................................................. | 1 |
1-4 | General .................................................................. | 1 |
Section 2 | Definitions and Description of Terms ........................................ | 3 |
2-1 | Purpose .................................................................. | 3 |
2-2 | General .................................................................. | 3 |
2-3 | Types of Devices .......................................................... | 3 |
2-4 | Parts of Pressure Relief Devices ........................................... | 4 |
2-5 | Dimensional Characteristics — Pressure Relief Valves ...................... | 5 |
2-6 | Dimensional Characteristics — Nonreclosing Pressure Relief Devices ....... | 7 |
2-7 | Operational Characteristics of Pressure Relief Devices ..................... | 7 |
2-8 | Description of Terms ...................................................... | 8 |
Part II | Flow Capacity Testing ...................................................... | 11 |
Section 3 | Guiding Principles ......................................................... | 11 |
3-1 | Items on Which Agreement Shall Be Reached .............................. | 11 |
3-2 | Qualification of Person Supervising the Test ............................... | 11 |
3-3 | Responsibility of Person Supervising the Test .............................. | 11 |
3-4 | Test Apparatus ........................................................... | 11 |
3-5 | Preliminary Tests ......................................................... | 11 |
3-6 | Spare Instruments ........................................................ | 11 |
3-7 | Calibration of Instruments ................................................ | 11 |
3-8 | Metering Sections ......................................................... | 12 |
3-9 | Flow Resistance Test Rigs ................................................. | 12 |
3-10 | Adjustments During Tests ................................................. | 14 |
3-11 | Records and Test Results .................................................. | 14 |
3-12 | Measurement Uncertainty ................................................. | 14 |
Section 4 | Instruments and Methods of Measurements ................................. | 15 |
4-1 | General .................................................................. | 15 |
4-2 | Fluid Conditions, Test Conditions, and Instrumentation .................... | 15 |
4-3 4-4 4-5 | Testing With Steam, Pressure Relief Device Discharging to Atmospheric Pressure ................................................................ Testing With Gas or Air, Pressure Relief Device Discharging to Atmospheric Pressure ................................................................ Testing With Liquids, Pressure Relief Devices Discharging to Atmospheric Pressure ................................................................ | 18 23 24 |
4-6 | Testing With Steam, With Back Pressure Above Atmospheric ............... | 25 |
4-7 | Testing With Gas or Air, With Back Pressure Above Atmospheric .......... | 27 |
4-8 | Testing With Liquids, With Back Pressure Above Atmospheric ............. | 29 |
iii
4-9 4-10 | Testing With Gas or Air, Nonreclosing Pressure Relief Device Flow Resistance Method ..................................................... Testing Nonreclosing Pressure Relief Devices to Determine a Set Pressure for Incompressible Fluids ...................................... | 30 31 |
Section 5 | Computation of Results..................................................... | 34 |
5-1 | Correction of Measured Variables ......................................... | 34 |
5-2 | Review of Instrument Readings ........................................... | 34 |
5-3 | Use of Equation Symbols ................................................. | 34 |
5-4 | Density ................................................................... | 34 |
5-5 | Capacity Calculations ..................................................... | 34 |
Section 6 | Test Summary Report Form ................................................. | 48 |
6-1 | General Instructions ...................................................... | 48 |
6-2 | Part I: General Information ............................................... | 48 |
6-3 | Part II: Summary of Results ............................................... | 48 |
6-4 | Part III: Description of Device Under Test ................................. | 48 |
6-5 | Part IV: Observed Data and Computed Results ............................ | 48 |
6-6 | Part V: Test Conditions and Corrections Agreements ....................... | 48 |
6-7 | Part VI: Test Methods and Procedures ..................................... | 49 |
6-8 | Part VII: Supporting Data ................................................. | 49 |
6-9 | Part VIII: Graphical Presentation of Back-Pressure Test Results ............. | 49 |
Part III | In-Service and Bench Testing ............................................... | 54 |
Section 7 | Guiding Principles ......................................................... | 54 |
7-1 | Items on Which Agreement Shall Be Reached .............................. | 54 |
7-2 | Qualification of Person Conducting the Test ............................... | 54 |
7-3 | Responsibility of Person Conducting the Test .............................. | 54 |
7-4 | Test Apparatus ........................................................... | 54 |
7-5 | Preliminary Training ...................................................... | 54 |
7-6 | Spare Instruments ........................................................ | 54 |
7-7 | Calibration of Instruments ................................................ | 54 |
7-8 | Adjustments During Test .................................................. | 55 |
7-9 | Records and Test Results .................................................. | 55 |
7-10 | Measurement Uncertainty ................................................. | 55 |
Section 8 | Instruments and Methods of Measurements ................................. | 56 |
8-1 | General .................................................................. | 56 |
8-2 | Instrumentation .......................................................... | 56 |
8-3 | In-Service Testing Procedures ............................................. | 59 |
8-4 | Bench Testing Procedures ................................................. | 61 |
8-5 | Seat Tightness Test ........................................................ | 61 |
Section 9 | Computation of Results..................................................... | 62 |
9-1 | Correction of Measured Variables ......................................... | 62 |
9-2 | Review of Instrument Readings ........................................... | 62 |
9-3 | Computation of Operational Characteristics ............................... | 62 |
Section 10 | Test Summary Report Form ................................................. | 63 |
10-1 | General Instructions ...................................................... | 63 |
10-2 | Part I: General Information ............................................... | 63 |
10-3 | Part II: Summary of Results ............................................... | 63 |
10-4 | Part III: Description of Valve Under Test ................................... | 63 |
10-5 | Part IV: Observed Data and Computed Results ............................ | 63 |
10-6 | Part V: Contract and Agreed Test Conditions Corrections .................. | 63 |
10-7 | Part VI: Test Methods and Procedures ..................................... | 63 |
10-8 | Part VII: Supporting Data ................................................. | 63 |
iv
Figures 2-5-1 | Typical Curtain Areas of Pressure Relief Valves ............................ | 6 |
3-9-1 | Recommended Arrangements for Testing Nonreclosing Pressure Relief Device Flow Resistance ................................................. | 13 |
4-2.3-1 | Recommended Arrangements for Testing Devices With Atmospheric Back Pressure — Flowmeter Test Arrangement .......................... | 16 |
4-2.10-1 | Recommended Internal Contours of Nozzles, Fittings, Adapter, and Reducers Between Test Vessel and Test Device ........................... | 19 |
4-2.10-2 | Recommended Arrangements for Testing Devices With Atmospheric Back Pressure — Weighed-Condensate Test Arrangement ................ | 20 |
4-2.10-3 | Recommended Arrangements for Testing Devices With Atmospheric Back Pressure — Weighed-Water Test Arrangement ...................... | 20 |
4-2.10-4 | Recommended Discharge Arrangements for Testing Devices With Superimposed Back Pressure ............................................ | 21 |
4-2.10-5 | Recommended Arrangement for Testing Nonreclosing Pressure Relief Devices in Combination With Pressure Relief Valves ..................... | 21 |
4-6-1 | Recommended Discharge Arrangements for Testing Devices With Built-Up Back Pressure .......................................................... | 26 |
4-10-1 | Recommended Arrangements for Conducting Opening Test on Nonreclosing Pressure Relief Devices With Incompressible Fluids ........ | 32 |
8-2.2-1 | Recommended Arrangement for Testing Valves With Compressible Fluids .................................................................. | 57 |
8-2.2-2 | Recommended Arrangement for Testing Valves With Incompressible Fluids ........... |