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eLibrary > ASME PTC 25-2023 Pressure Relief Devices >

ASME PTC 25-2023 Pressure Relief Devices, 2023

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 Non-reclosing Pressure Relief Device
2-4 PARTS OF PRESSURE RELIEF DEVICES
2-5 DIMENSIONAL CHARACTERISTICS — PRESSURE RELIEF VALVES
2-6 DIMENSIONAL CHARACTERISTICS — NON-RECLOSING 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
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 DEVICE 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 4-6.1-1)
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, NON-RECLOSING 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 Non-reclosing Pressure Relief Devices With Connections Not Compatible With Figure 3-9-1
4-10 TESTING NON-RECLOSING 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 Non-reclosing 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 — Non-reclosing 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 Non-reclosing 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, Adapters, 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 Recommended Arrangements 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 Non-reclosing Pressure Relief Devices in Combination With Pressure Relief Valves
Figure 4-6.1-1 Recommended Discharge Arrangement for Testing Devices With Built-Up Back Pressure
Figure 4-10.1-1 Recommended Arrangement for Conducting Opening Test on Non-reclosing 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-2-1 Table of Uncertainty Parameters — U.S. Customary Units
Table II-2-1M Table of Uncertainty Parameters — SI Units
Table III-2.1-1 Sample Test Data
Forms [Go to Page]
TEST REPORT FORM 5-5.1-1 PRESSURE RELIEF DEVICE TESTED WITH STEAM AND WATER — U.S. Customary Units: Observed Data and Computed Results — Weighed-Water Method
TEST REPORT FORM 5-5.1-1M PRESSURE RELIEF DEVICE TESTED WITH STEAM AND WATER — SI Units: Observed Data and Computed Results — Weighed-Water Method
TEST REPORT FORM 5-5.2-1 PRESSURE RELIEF DEVICE TESTED WITH STEAM — U.S. Customary Units: Observed Data and Computed Results — Flowmeter Method
TEST REPORT FORM 5-5.2-1M PRESSURE RELIEF DEVICE TESTED WITH STEAM — SI Units: Observed Data and Computed Results — Flowmeter Method
TEST REPORT FORM 5-5.3-1 PRESSURE RELIEF DEVICE TESTED WITH LIQUIDS — U.S. Customary Units: Observed Data and Computed Results — Flowmeter Method
TEST REPORT FORM 5-5.3-1M PRESSURE RELIEF DEVICE TESTED WITH LIQUIDS — SI Units: Observed Data and Computed Results — Flowmeter Method
TEST REPORT FORM 5-5.4-1 PRESSURE RELIEF DEVICE TESTED WITH AIR OR GAS — U.S. Customary Units: Observed Data and Computed Results — Flowmeter Method
TEST REPORT FORM 5-5.4-1M PRESSURE RELIEF DEVICE TESTED WITH AIR OR GAS — SI Units: Observed Data and Computed Results — Flowmeter Method
TEST REPORT FORM 5-5.5-1 PRESSURE RELIEF DEVICE TESTED WITH AIR OR GAS — U.S. Customary Units: Observed Data and Computed Results — Sonic-Flow Method
TEST REPORT FORM 5-5.5-1M PRESSURE RELIEF DEVICE TESTED WITH AIR OR GAS — SI Units: Observed Data and Computed Results — Sonic-Flow Method
TEST REPORT FORM 5-5.6-1 PRESSURE RELIEF DEVICE TESTED WITH FUEL GAS — U.S. Customary Units: Observed Data and Computed Results — Flowmeter Method
TEST REPORT FORM 5-5.6-1M PRESSURE RELIEF DEVICE TESTED WITH FUEL GAS — SI Units: Observed Data and Computed Results — Flowmeter Method
TEST REPORT FORM 5-5.7-1 NON-RECLOSING PRESSURE RELIEF DEVICE TESTED WITH AIR — U.S. Customary Units: Observed Data and Computed Results — Flow Resistance
TEST REPORT FORM 5-5.7-1M NON-RECLOSING PRESSURE RELIEF DEVICE TESTED WITH AIR — SI Units: Observed Data and Computed Results — Flow Resistance
TEST SUMMARY REPORT FORM 6-5-1 Pressure and Relief Valve Performance Test Report: STEAM
TEST SUMMARY REPORT FORM 6-5-2 Pressure and Relief Valve Performance Test Report: LIQUIDS AND WATER
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 Non-reclosing Pressure Relief Device Performance Test Report: AIR, GAS, OR FUEL GAS
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 [Go to Page]
II-2.1 Parameter C — Discharge Coefficient
II-2.2 Parameter do — Diameter of Orifice Plate
II-2.3 Parameter D — Diameter of Meter
II-2.4 Parameter Fa — Thermal ExpansionNumber
II-2.5 Parameter ρ — Density of Water
II-2.6 Parameter ΔP — Differential Pressure Head Across Meter, in. (mm) Water
II-2.7 Uncertainty Calculation
II-3 REFERENCES
MANDATORY APPENDIX III EXAMPLE OF PRESSURE TAP PROFILE COMPARISON [Go to Page]
III-1 PURPOSE
III-2 EXAMPLE DETERMINATION [Go to Page]
III-2.1 Sample Data
III-2.2 Calculations
NONMANDATORY APPENDIX A REFERENCES [Go to Page]

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