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ASME PTC 25-2018 - Pressure Relief Devices, 2018
- CONTENTS
- NOTICE
- FOREWORD
- ASME PTC COMMITTEE ROSTER
- CORRESPONDENCE WITH THE PTC COMMITTEE
- INTRODUCTION
- PART I GENERAL [Go to Page]
- Section 1 Object and Scope [Go to Page]
- 1-1 OBJECT
- 1-2 SCOPE
- 1-3 MEASUREMENT UNCERTAINTY
- 1-4 GENERAL
- Section 2 Definitions and Description of Terms [Go to Page]
- 2-1 PURPOSE
- 2-2 GENERAL
- 2-3 TYPES OF DEVICES [Go to Page]
- 2-3.1 Reclosing Pressure-Relieving Devices
- 2-3.2 Nonreclosing Pressure Relief Device
- 2-4 PARTS OF PRESSURE RELIEF DEVICES
- 2-5 DIMENSIONAL CHARACTERISTICS — PRESSURE RELIEF VALVES
- 2-6 DIMENSIONAL CHARACTERISTICS — NONRECLOSING PRESSURE RELIEF DEVICES
- 2-7 OPERATIONAL CHARACTERISTICS OF PRESSURE RELIEF DEVICES
- 2-8 DESCRIPTION OF TERMS
- PART II FLOW CAPACITY TESTING [Go to Page]
- Section 3 Guiding Principles [Go to Page]
- 3-1 ITEMS ON WHICH AGREEMENT SHALL BE REACHED
- 3-2 QUALIFICATION OF PERSON SUPERVISING THE TEST
- 3-3 RESPONSIBILITY OF PERSON SUPERVISING THE TEST
- 3-4 TEST APPARATUS
- 3-5 PRELIMINARY TESTS
- 3-6 SPARE INSTRUMENTS
- 3-7 CALIBRATION OF INSTRUMENTS [Go to Page]
- 3-7.1 Pressure
- 3-7.2 Temperature
- 3-7.3 Lift Indicators and Recorders
- 3-7.4 Weighing Scales
- 3-7.5 Steam Calorimeters
- 3-8 METERING SECTIONS
- 3-9 FLOW RESISTANCE TEST RIGS [Go to Page]
- 3-9.1 Measured Flow Resistance
- 3-9.2 Pressure Tap Profile Comparison
- 3-10 ADJUSTMENTS DURING TESTS
- 3-11 RECORDS AND TEST RESULTS
- 3-12 MEASUREMENT UNCERTAINTY [Go to Page]
- Figure 3-9-1 Recommended Arrangements for Testing Nonreclosing Pressure Relief Device Flow Resistance
- Section 4 Instruments and Methods of Measurements [Go to Page]
- 4-1 GENERAL
- 4-2 FLUID CONDITIONS, TEST CONDITIONS, AND INSTRUMENTATION [Go to Page]
- 4-2.1 Atmospheric Pressure
- 4-2.2 Temperature
- 4-2.3 Pressure Measurements
- 4-2.4 Flow Measurement
- 4-2.5 Valve-Lift Measurements
- 4-2.6 Steam Quality
- 4-2.7 Reference Conditions for Which Corrections May Be Applied
- 4-2.8 Specific Gravity
- 4-2.9 Chemical Composition
- 4-2.10 General Features of Tests
- 4-2.11 Establishing Set Pressure and Blowdown
- 4-3 TESTING WITH STEAM, PRESSURE RELIEF DEVICE DISCHARGING TO ATMOSPHERIC PRESSURE [Go to Page]
- 4-3.1 Test Arrangements
- 4-3.2 Preliminary Tests
- 4-3.3 Barometric Pressure
- 4-3.4 Details of Procedure for Flow Measurement of Devices Using the Flowmeter Method
- 4-3.5 Details of Procedure for Flow Measurement of Devices Using the Weighed-Condensate Method
- 4-3.6 Observation of the Device Mechanical Characteristics
- 4-3.7 Recording Additional Data
- 4-4 TESTING WITH GAS OR AIR, PRESSURE RELIEF DEVICE DISCHARGING TO ATMOSPHERIC PRESSURE [Go to Page]
- 4-4.1 Test Arrangement
- 4-4.2 Preliminary Device Tests
- 4-4.3 Barometric Pressure
- 4-4.4 Details of Procedure for Flow Measurement of Devices Using Subsonic-Inferential-Meter Method
- 4-4.5 Details of Procedure for Flow Measurement of Devices Using Sonic-Inferential-Meter Method
- 4-4.6 Observation of the Mechanical Characteristics
- 4-4.7 Recording Additional Data
- 4-5 TESTING WITH LIQUIDS, PRESSURE RELIEF DEVICES DISCHARGING TO ATMOSPHERIC PRESSURE [Go to Page]
- 4-5.1 Test Arrangements
- 4-5.2 Preliminary Tests
- 4-5.3 Details of Procedure for Flow Measurement of Devices Using the Flowmeter Method
- 4-5.4 Details of Procedure for Flow Measurement of Devices Using the Volumetric or Gravimetric Method
- 4-5.5 Observation of Mechanical Characteristics
- 4-5.6 Recording Additional Data
- 4-6 TESTING WITH STEAM, WITH BACK PRESSURE ABOVE ATMOSPHERIC [Go to Page]
- 4-6.1 Test Arrangements
- 4-6.2 Preliminary Tests
- 4-6.3 Barometric Pressure
- 4-6.4 Details of Procedure for Flow Measurement
- 4-6.5 Testing With Superimposed Back Pressure [See Para. 4-6.1(a)]
- 4-6.6 Testing With Built-Up Back Pressure [See Para. 4-6.1(b)]
- 4-6.7 Observation of Mechanical Characteristics
- 4-6.8 Recording Additional Data
- 4-7 TESTING WITH GAS OR AIR, WITH BACK PRESSURE ABOVE ATMOSPHERIC [Go to Page]
- 4-7.1 Test Arrangements
- 4-7.2 Preliminary Tests
- 4-7.3 Barometric Pressure
- 4-7.4 Details of Procedure for Flow Measurement
- 4-7.5 Testing With Superimposed Back Pressure [See Para. 4-7.1(a)]
- 4-7.6 Testing With Built-Up Back Pressure [See Para. 4-7.1(b)]
- 4-7.7 Observation of Mechanical Characteristics
- 4-7.8 Recording Additional Data
- 4-8 TESTING WITH LIQUIDS, WITH BACK PRESSURE ABOVE ATMOSPHERIC [Go to Page]
- 4-8.1 Test Arrangements
- 4-8.2 Preliminary Tests
- 4-8.3 Details of Procedure for Flow Measurement
- 4-8.4 Testing With Superimposed Back Pressure (See Figure 4-2.10-4)
- 4-8.5 Testing With Built-Up Back Pressure (See Figure 4-6-1)
- 4-8.6 Tests With Built-Up Back Pressure With Measuring Tank
- 4-8.7 Observation of Mechanical Characteristics
- 4-8.8 Recording Additional Data
- 4-9 TESTING WITH GAS OR AIR, NONRECLOSING PRESSURE RELIEF DEVICE FLOW RESISTANCE METHOD [Go to Page]
- 4-9.1 Test Arrangement
- 4-9.2 Preliminary Tests
- 4-9.3 Barometric Pressure
- 4-9.4 Details of Procedure for Flow Resistance Measurement Using Subsonic-Inferential-Meter Method
- 4-9.5 Details of Procedure for Flow Resistance Measurement Using Sonic-Inferential-Meter Method
- 4-9.6 Recording Additional Data
- 4-9.7 Resistance Testing on Nonreclosing Pressure Relief Devices With Connections Not Compatible With Figure 3-9-1
- 4-10 TESTING NONRECLOSING PRESSURE RELIEF DEVICES TO DETERMINE A SET PRESSURE FOR INCOMPRESSIBLE FLUIDS [Go to Page]
- 4-10.1 Test Arrangement
- 4-10.2 Preliminary Test
- 4-10.3 Details of Procedure for Determining a Nonreclosing Pressure Relief Device Flow Resistance Factor Applicable for Incompressible Fluids
- Section 5 Computation of Results [Go to Page]
- 5-1 CORRECTION OF MEASURED VARIABLES
- 5-2 REVIEW OF INSTRUMENT READINGS
- 5-3 USE OF EQUATION SYMBOLS
- 5-4 DENSITY
- 5-5 CAPACITY CALCULATIONS [Go to Page]
- 5-5.1 Volumetric or Weighed-Water Method
- 5-5.2 Steam — Flowmeter Method
- 5-5.3 Liquids — Flowmeter Method
- 5-5.4 Air or Gas — Flowmeter Method
- 5-5.5 Air or Gas — Sonic-Flow Method
- 5-5.6 Fuel-Gas Flow — Flowmeter Method
- 5-5.7 Air or Gas — Nonreclosing Pressure Relief Device Flow Resistance Method
- Section 6 Test Summary Report Form [Go to Page]
- 6-1 GENERAL INSTRUCTIONS
- 6-2 PART I: GENERAL INFORMATION
- 6-3 PART II: SUMMARY OF RESULTS
- 6-4 PART III: DESCRIPTION OF DEVICE UNDER TEST
- 6-5 PART IV: OBSERVED DATA AND COMPUTED RESULTS
- 6-6 PART V: TEST CONDITIONS AND CORRECTIONS AGREEMENTS
- 6-7 PART VI: TEST METHODS AND PROCEDURES
- 6-8 PART VII: SUPPORTING DATA
- 6-9 PART VIII: GRAPHICAL PRESENTATION OF BACK-PRESSURE TEST RESULTS
- PART III IN-SERVICE AND BENCH TESTING [Go to Page]
- Section 7 Guiding Principles [Go to Page]
- 7-1 ITEMS ON WHICH AGREEMENT SHALL BE REACHED
- 7-2 QUALIFICATION OF PERSON CONDUCTING THE TEST
- 7-3 RESPONSIBILITY OF PERSON CONDUCTING THE TEST
- 7-4 TEST APPARATUS
- 7-5 PRELIMINARY TRAINING
- 7-6 SPARE INSTRUMENTS
- 7-7 CALIBRATION OF INSTRUMENTS [Go to Page]
- 7-7.1 Pressure
- 7-7.2 Temperature
- 7-7.3 Force
- 7-8 ADJUSTMENTS DURING TEST
- 7-9 RECORDS AND TEST RESULTS
- 7-10 MEASUREMENT UNCERTAINTY
- Section 8 Instruments and Methods of Measurements [Go to Page]
- 8-1 GENERAL
- 8-2 INSTRUMENTATION [Go to Page]
- 8-2.1 Temperature
- 8-2.2 Pressure Measurements
- 8-2.3 Valve-Lift Measurements
- 8-3 IN-SERVICE TESTING PROCEDURES [Go to Page]
- 8-3.1 General Features of Tests
- 8-3.2 Test Methods
- 8-3.3 In-Service Verification of Pressure-Relieving Capacity
- 8-4 BENCH TESTING PROCEDURES [Go to Page]
- 8-4.1 General Features of Tests
- 8-4.2 Compressible Fluids
- 8-4.3 Incompressible Fluids
- 8-5 SEAT TIGHTNESS TEST
- Section 9 Computation of Results [Go to Page]
- 9-1 CORRECTION OF MEASURED VARIABLES
- 9-2 REVIEW OF INSTRUMENT READINGS
- 9-3 COMPUTATION OF OPERATIONAL CHARACTERISTICS [Go to Page]
- 9-3.1 Set Pressure
- 9-3.2 Blowdown
- 9-3.3 Lift
- Section 10 Test Summary Report Form [Go to Page]
- 10-1 GENERAL INSTRUCTIONS
- 10-2 PART I: GENERAL INFORMATION
- 10-3 PART II: SUMMARY OF RESULTS
- 10-4 PART III: DESCRIPTION OF VALVE UNDER TEST
- 10-5 PART IV: OBSERVED DATA AND COMPUTED RESULTS
- 10-6 PART V: CONTRACT AND AGREED TEST CONDITIONS CORRECTIONS
- 10-7 PART VI: TEST METHODS AND PROCEDURES
- 10-8 PART VII: SUPPORTING DATA
- Figures [Go to Page]
- Figure 2-5-1 Typical Curtain Areas of Pressure Relief Valves
- Figure 3-9-1 Recommended Arrangements for Testing Nonreclosing Pressure Relief Device Flow Resistance
- Figure 4-2.3-1 Recommended Arrangements for Testing Devices With Atmospheric Back Pressure — Flowmeter Test Arrangement
- Figure 4-2.10-1 Recommended Internal Contours of Nozzles, Fittings, Adapter, and Reducers Between Test Vessel and Test Device
- Figure 4-2.10-2 Recommended Arrangements for Testing Devices With Atmospheric Back Pressure — Weighed-Condensate Test Arrangement
- Figure 4-2.10-3 RecommendedArrangements for Testing Devices With Atmospheric Back Pressure — Weighed-Water Test Arrangement
- Figure 4-2.10-4 Recommended Discharge Arrangement for Testing Devices With Superimposed Back Pressure
- Figure 4-2.10-5 Recommended Arrangement for Testing Nonreclosing Pressure Relief Devices in Combination With Pressure Relief Valves
- Figure 4-6-1 Recommended Discharge Arrangement for Testing Devices With Built-Up Back Pressure
- Figure 4-10-1 Recommended Arrangement for Conducting Opening Test on Nonreclosing Pressure Relief Devices With Incompressible Fluids
- Figure 8-2.2-1 Recommended Arrangement for Testing Valves With Compressible Fluids
- Figure 8-2.2-2 Recommended Arrangement for Testing Valves With Incompressible Fluids
- Figure 8-3.2-1 Pilot-Operated Pressure Relief Valve Field Test Accessory
- Tables [Go to Page]
- Table I-1 SI (Metric) Units
- Table I-2 Commonly Used Conversion Factors
- Table II-1 Table of Uncertainty Parameters
- Table II-1M Table of Uncertainty Parameters
- Forms [Go to Page]
- TEST REPORT FORM 5-5.1 PRESSURE RELIEF DEVICE TESTED WITH STEAM AND WATER
- TEST REPORT FORM 5-5.1M PRESSURE RELIEF DEVICE TESTED WITH STEAM AND WATER
- TEST REPORT FORM 5-5.2 PRESSURE RELIEF DEVICE TESTED WITH STEAM
- TEST REPORT FORM 5-5.2M PRESSURE RELIEF DEVICE TESTED WITH STEAM
- TEST REPORT FORM 5-5.3 PRESSURE RELIEF DEVICE TESTED WITH LIQUIDS
- TEST REPORT FORM 5-5.3M PRESSURE RELIEF DEVICE TESTED WITH LIQUIDS
- TEST REPORT FORM 5-5.4 PRESSURE RELIEF DEVICE TESTED WITH AIR OR GAS
- TEST REPORT FORM 5-5.4M PRESSURE RELIEF DEVICE TESTED WITH AIR OR GAS
- TEST REPORT FORM 5-5.5 PRESSURE RELIEF DEVICE TESTED WITH AIR OR GAS
- TEST REPORT FORM 5-5.5M PRESSURE RELIEF DEVICE TESTED WITH AIR OR GAS
- TEST REPORT 5-5.6 PRESSURE RELIEF DEVICE TESTED WITH FUEL GAS
- TEST REPORT 5-5.6M PRESSURE RELIEF DEVICE TESTED WITH FUEL GAS
- TEST REPORT FORM 5-5.7 NONRECLOSING PRESSURE RELIEF DEVICE TESTED WITH AIR
- TEST REPORT FORM 5-5.7M NONRECLOSING PRESSURE RELIEF DEVICE TESTED WITH AIR
- TEST SUMMARY REPORT FORM 6-5.1 Pressure and Relief Valve Performance Test Report: STEAM
- TEST SUMMARY REPORT FORM 6-5.3 Pressure and Relief Valve Performance Test Report: AIR, GAS, OR FUEL GAS
- TEST SUMMARY REPORT FORM 6-5.4 Nonreclosing Pressure Relief Device Performance Test Report: AIR, GAS, OR FUEL GAS
- TEST SUMMARY REPORT FORM 6-5.2 Pressure and Relief Valve Performance Test Report: LIQUIDS AND WATER
- MANDATORY APPENDIX I SI (METRIC) UNITS AND CONVERSION FACTORS
- MANDATORY APPENDIX II EXAMPLES OF DETERMINING FLOW RATE UNCERTAINTIES [Go to Page]
- II-1 PURPOSE
- II-2 EXAMPLE DETERMINATION
- II-3 REFERENCES
- NONMANDATORY APPENDIX A REFERENCES [Go to Page]
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