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ASME PTC 25 2014

ASME PTC 25 2014

$98.04

ASME PTC 25 Pressure Relief Devices

Published By Publication Date Number of Pages
ASME 2014 88
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The object of this PTC test is to determine the performance of pressure relief devices. Procedures for conducting the tests, calculating the results, and making corrections are defined. This Code provides instructions for flow capacity testing and for in-service and bench testing. Testing of reclosing and nonreclosing pressure relief devices is conducted under various inlet and outlet conditions using steam, gases, and liquids for which valid physical properties are known.

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PDF Pages PDF Title
5 CONTENTS
8 NOTICE
9 FOREWORD
10 COMMITTEE ROSTER
11 CORRESPONDENCE WITH THE PTC COMMITTEE
12 INTRODUCTION
13 PART I GENERAL
Section 1 Object and Scope
1-1 OBJECT
1-2 SCOPE
1-3 MEASUREMENT UNCERTAINTY
1-4 GENERAL
15 Section 2 Definitions and Description of Terms
2-1 PURPOSE
2-2 GENERAL
2-3 TYPES OF DEVICES
2-3.1 Reclosing Pressure-Relieving Devices
2-3.2 Nonreclosing Pressure Relief Device
16 2-4 PARTS OF PRESSURE RELIEF DEVICES
17 2-5 DIMENSIONAL CHARACTERISTICS — PRESSURE RELIEF VALVES
18 Figures
Fig. 2-5-1 Typical Curtain Areas of Pressure Relief Valves
19 2-6 DIMENSIONAL CHARACTERISTICS — NONRECLOSING PRESSURE RELIEF DEVICES
2-7 OPERATIONAL CHARACTERISTICS OF PRESSURE RELIEF DEVICES
20 2-8 DESCRIPTION OF TERMS
23 PART II FLOW CAPACITY TESTING
Section 3 Guiding Principles
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
3-7.1 Pressure
24 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
3-9.1 Measured Flow Resistance
3-9.2 Pressure Tap Profile Comparison
25 Fig. 3-9-1 Recommended Arrangements for Testing Nonreclosing Pressure Relief Device Flow Resistance
26 3-10 ADJUSTMENTS DURING TESTS
3-11 RECORDS AND TEST RESULTS
3-12 MEASUREMENT UNCERTAINTY
27 Section 4 Instruments and Methods of Measurements
4-1 GENERAL
4-2 FLUID CONDITIONS, TEST CONDITIONS, AND INSTRUMENTATION
4-2.1 Atmospheric Pressure
4-2.2 Temperature
4-2.3 Pressure Measurements
28 4-2.4 Flow Measurement
Fig. 4-2.3-1 Recommended Arrangements for Testing Devices With Atmospheric Back Pressure — Flowmeter Test Arrangement
29 4-2.5 Valve-Lift Measurements
4-2.6 Steam Quality
4-2.7 Reference Conditions for Which Corrections May Be Applied
30 4-2.8 Specific Gravity
4-2.9 Chemical Composition
4-2.10 General Features of Tests
4-3 TESTING WITH STEAM, PRESSURE RELIEF DEVICE DISCHARGING TO ATMOSPHERIC PRESSURE
4-3.1 Test Arrangements
31 Fig. 4-2.10-1 Recommended Internal Contours of Nozzles, Fittings, Adapter, and Reducers Between Test Vessel and Test Device
32 Fig. 4-2.10-2 Recommended Arrangements for Testing Devices With Atmospheric Back Pressure — Weighed-Condensate Test Arrangement
Fig. 4-2.10-3 Recommended Arrangements forTesting Devices With Atmospheric Back Pressure — Weighed-Water Test Arrangement
33 Fig. 4-2.10-4 Recommended Discharge Arrangements for Testing Devices With Superimposed Back Pressure
Fig. 4-2.10-5 Recommended Arrangement for Testing Nonreclosing Pressure Relief Devices in Combination With Pressure Relief Valves
34 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
35 4-3.7 Recording Additional Data
4-4 TESTING WITH GAS OR AIR, PRESSURE RELIEF DEVICE DISCHARGING TO ATMOSPHERIC PRESSURE
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
36 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
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
37 4-5.5 Observation of Mechanical Characteristics
4-5.6 Recording Additional Data
4-6 TESTING WITH STEAM, WITH BACK PRESSURE ABOVE ATMOSPHERIC
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. 4-6.1a
38 4-6.6 Testing With Built-Up Back Pressure See Para. 4-6.1b
Fig. 4-6-1 Recommended Discharge Arrangements for Testing Devices With Built-Up Back Pressure
39 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
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. 4-7.1a
40 4-7.6 Testing With Built-Up Back Pressure See Para. 4-7.1b
4-7.7 Observation of Mechanical Characteristics
4-7.8 Recording Additional Data
41 4-8 TESTING WITH LIQUIDS, WITH BACK PRESSURE ABOVE ATMOSPHERIC
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 Fig. 4-2.10-4
4-8.5 Testing With Built-Up Back Pressure See Fig. 4-6-1
42 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
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
43 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 Fig. 3-9-1
4-10 TESTING NONRECLOSING PRESSURE RELIEF DEVICES TO DETERMINE A SET PRESSURE FOR INCOMPRESSIBLE FLUIDS
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
44 Fig. 4-10-1 Recommended Arrangements for Conducting Opening Test on Nonreclosing Pressure Relief Devices With Incompressible Fluids
46 Section 5 Computation of Results
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
5-5.1 Volumetric or Weighed-Water Method
47 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
48 5-5.7 Air or Gas — Nonreclosing Pressure Relief Device Flow Resistance Method
49 Forms
TEST REPORT FORM 5-5.1 PRESSURE RELIEF DEVICE TESTED WITH STEAM AND WATER Observed Data and Computed Results — Weighed-Water Method
50 TEST REPORT FORM 5-5.2 PRESSURE RELIEF DEVICE TESTED WITH STEAM Observed Data and Computed Results — Flowmeter Method
52 TEST REPORT FORM 5-5.3 PRESSURE RELIEF DEVICE TESTED WITH LIQUIDS Observed Data and Computed Results — Flowmeter Method
53 TEST REPORT FORM 5-5.4 PRESSURE RELIEF DEVICE TESTED WITH AIR OR GAS Observed Data and Computed Results — Flowmeter Method
55 TEST REPORT FORM 5-5.5 PRESSURE RELIEF DEVICE TESTED WITH AIR OR GAS Observed Data and Computed Results — Sonic-Flow Method
56 TEST REPORT 5-5.6 PRESSURE RELIEF DEVICE TESTED WITH FUEL GAS Observed Data and Computed Results — Flowmeter Method
58 TEST REPORT FORM 5-5.7 NONRECLOSING PRESSURE RELIEF DEVICE TESTED WITH AIR Observed Data and Computed Results — Flow Resistance
60 Section 6 Test Summary Report Form
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
61 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
62 TEST SUMMARY REPORT FORM 6-5.1 Pressure and Relief Valve Perf ormance Test Report STEAM
63 TEST SUMMARY REPORT FORM 6-5.2 Pressure and Relief Valve Performance Test Report LIQUIDS AND WATER
64 TEST SUMMARY REPORT FORM 6-5.3 Pressure and Relief Valve Performance Test Report AIR, GAS, OR FUEL GAS
65 TEST SUMMARY REPORT FORM 6-5.4 Nonreclosing Pressure Relief Device Performance Test Report AIR, GAS, OR FUEL GAS
66 PART III IN-SERVICE AND BENCH TESTING
Section 7 Guiding Principles
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
7-7.1 Pressure
67 7-7.2 Temperature
7-7.3 Force
7-8 ADJUSTMENTS DURING TEST
7-9 RECORDS AND TEST RESULTS
7-10 MEASUREMENT UNCERTAINTY
68 Section 8 Instruments and Methods of Measurements
8-1 GENERAL
8-2 INSTRUMENTATION
8-2.1 Temperature
8-2.2 Pressure Measurements
69 Fig. 8-2.2-1 Recommended Arrangement for Testing Valves With Compressible Fluids
70 Fig. 8-2.2-2 Recommended Arrangement for Testing Valves With Incompressible Fluids
71 8-2.3 Valve-Lift Measurements
8-3 IN-SERVICE TESTING PROCEDURES
8-3.1 General Features of Tests
8-3.2 Test Methods
72 8-3.3 In-Service Verification of Pressure-Relieving Capacity
Fig. 8-3.2-1 Pilot-Operated Pressure Relief Valve Field Test Accessory
73 8-4 BENCH TESTING PROCEDURES
8-4.1 General Features of Tests
8-4.2 Compressible Fluids
8-4.3 Incompressible Fluids
8-5 SEAT TIGHTNESS TEST
74 Section 9 Computation of Results
9-1 CORRECTION OF MEASURED VARIABLES
9-2 REVIEW OF INSTRUMENT READINGS
9-3 COMPUTATION OF OPERATIONAL CHARACTERISTICS
9-3.1 Set Pressure
9-3.2 Blowdown
9-3.3 Lift
75 Section 10 Test Summary Report Form
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
77 MANDATORY APPENDICES
MANDATORY APPENDIX I SI METRIC UNITS AND CONVERSION FACTORS
79 MANDATORY APPENDIX II EXAMPLES OF DETERMINING FLOW RATE UNCERTAINTIES
II-1 PURPOSE
II-2 EXAMPLE DETERMINATION
II-2.1 Parameter C — Discharge Coefficient
II-2.2 Parameter d inf.-o — Diameter of Orifice Plate
II-2.3 Parameter D — Diameter of Meter
II-2.4 Parameter Fa — Thermal Expansion Number
80 II-2.5 Parameter rho — Density of Water
II-2.6 Parameter DeltaP — Differential Pressure Head Across Meter, in. Water
83 II-3 REFERENCES
84 NONMANDATORY APPENDIX A REFERENCES

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