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ASME PTC 25 2018

ASME PTC 25 2018

$98.04

ASME PTC 25-2018 – Pressure Relief Devices

Published By Publication Date Number of Pages
ASME 2018 98
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(a) This Code provides instructions in Part II for flow capacity testing and in Part III 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. (b) The validity of tests shall be determined in accordance to the requirements of subsection 1-3.

PDF Catalog

PDF Pages PDF Title
4 CONTENTS
8 NOTICE
9 FOREWORD
10 ASME PTC COMMITTEE ROSTER
11 CORRESPONDENCE WITH THE PTC COMMITTEE
13 INTRODUCTION
14 PART I GENERAL
Section 1 Object and Scope
1-1 OBJECT
1-2 SCOPE
1-3 MEASUREMENT UNCERTAINTY
1-4 GENERAL
16 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
17 2-3.2 Nonreclosing Pressure Relief Device
2-4 PARTS OF PRESSURE RELIEF DEVICES
18 2-5 DIMENSIONAL CHARACTERISTICS — PRESSURE RELIEF VALVES
19 2-6 DIMENSIONAL CHARACTERISTICS — NONRECLOSING PRESSURE RELIEF DEVICES
2-7 OPERATIONAL CHARACTERISTICS OF PRESSURE RELIEF DEVICES
20 Figures
Figure 2-5-1 Typical Curtain Areas of Pressure Relief Valves
21 2-8 DESCRIPTION OF TERMS
24 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
25 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
26 3-10 ADJUSTMENTS DURING TESTS
3-11 RECORDS AND TEST RESULTS
3-12 MEASUREMENT UNCERTAINTY
27 Figure 3-9-1 Recommended Arrangements for Testing Nonreclosing Pressure Relief Device Flow Resistance
Figure 3-9-1 Recommended Arrangements for Testing Nonreclosing Pressure Relief Device Flow Resistance
28 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
29 4-2.3 Pressure Measurements
4-2.4 Flow Measurement
Figure 4-2.3-1 Recommended Arrangements for Testing Devices With Atmospheric Back Pressure — Flowmeter Test Arrangement
30 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
31 4-2.11 Establishing Set Pressure and Blowdown
4-3 TESTING WITH STEAM, PRESSURE RELIEF DEVICE DISCHARGING TO ATMOSPHERIC PRESSURE
4-3.1 Test Arrangements
32 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
Figure 4-2.10-1 Recommended Internal Contours of Nozzles, Fittings, Adapter, and Reducers Between Test Vessel and Test Device
33 4-3.5 Details of Procedure for Flow Measurement of Devices Using the Weighed-Condensate Method
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
34 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
35 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
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
36 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
4-5.5 Observation of Mechanical Characteristics
4-5.6 Recording Additional Data
37 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. 4-6.1(a)]
4-6.6 Testing With Built-Up Back Pressure [See Para. 4-6.1(b)]
38 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
Figure 4-6-1 Recommended Discharge Arrangement for Testing Devices With Built-Up Back Pressure
39 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
40 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 Figure 4-2.10-4)
4-8.5 Testing With Built-Up Back Pressure (See Figure 4-6-1)
41 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
4-9.5 Details of Procedure for Flow Resistance Measurement Using Sonic-Inferential-Meter Method
42 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
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
43 Figure 4-10-1 Recommended Arrangement for Conducting Opening Test on Nonreclosing Pressure Relief Devices With Incompressible Fluids
44 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
45 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
46 5-5.6 Fuel-Gas Flow — Flowmeter Method
5-5.7 Air or Gas — Nonreclosing Pressure Relief Device Flow Resistance Method
47 Forms
TEST REPORT FORM 5-5.1 PRESSURE RELIEF DEVICE TESTED WITH STEAM AND WATER
48 TEST REPORT FORM 5-5.1M PRESSURE RELIEF DEVICE TESTED WITH STEAM AND WATER
49 TEST REPORT FORM 5-5.2 PRESSURE RELIEF DEVICE TESTED WITH STEAM
51 TEST REPORT FORM 5-5.2M PRESSURE RELIEF DEVICE TESTED WITH STEAM
53 TEST REPORT FORM 5-5.3 PRESSURE RELIEF DEVICE TESTED WITH LIQUIDS
54 TEST REPORT FORM 5-5.3M PRESSURE RELIEF DEVICE TESTED WITH LIQUIDS
55 TEST REPORT FORM 5-5.4 PRESSURE RELIEF DEVICE TESTED WITH AIR OR GAS
57 TEST REPORT FORM 5-5.4M PRESSURE RELIEF DEVICE TESTED WITH AIR OR GAS
59 TEST REPORT FORM 5-5.5 PRESSURE RELIEF DEVICE TESTED WITH AIR OR GAS
60 TEST REPORT FORM 5-5.5M PRESSURE RELIEF DEVICE TESTED WITH AIR OR GAS
61 TEST REPORT 5-5.6 PRESSURE RELIEF DEVICE TESTED WITH FUEL GAS
63 TEST REPORT 5-5.6M PRESSURE RELIEF DEVICE TESTED WITH FUEL GAS
65 TEST REPORT FORM 5-5.7 NONRECLOSING PRESSURE RELIEF DEVICE TESTED WITH AIR
67 TEST REPORT FORM 5-5.7M NONRECLOSING PRESSURE RELIEF DEVICE TESTED WITH AIR
69 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
70 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
71 TEST SUMMARY REPORT FORM 6-5.1 Pressure and Relief Valve Performance Test Report: STEAM
72 TEST SUMMARY REPORT FORM 6-5.2 Pressure and Relief Valve Performance Test Report: LIQUIDS AND WATER
73 TEST SUMMARY REPORT FORM 6-5.3 Pressure and Relief Valve Performance Test Report: AIR, GAS, OR FUEL GAS
74 TEST SUMMARY REPORT FORM 6-5.4 Nonreclosing Pressure Relief Device Performance Test Report: AIR, GAS, OR FUEL GAS
75 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
76 7-7.2 Temperature
7-7.3 Force
7-8 ADJUSTMENTS DURING TEST
7-9 RECORDS AND TEST RESULTS
7-10 MEASUREMENT UNCERTAINTY
77 Section 8 Instruments and Methods of Measurements
8-1 GENERAL
8-2 INSTRUMENTATION
8-2.1 Temperature
8-2.2 Pressure Measurements
78 8-2.3 Valve-Lift Measurements
8-3 IN-SERVICE TESTING PROCEDURES
8-3.1 General Features of Tests
8-3.2 Test Methods
79 Figure 8-2.2-1 Recommended Arrangement for Testing Valves With Compressible Fluids
80 Figure 8-2.2-2 Recommended Arrangement for Testing Valves With Incompressible Fluids
81 8-3.3 In-Service Verification of Pressure-Relieving Capacity
Figure 8-3.2-1 Pilot-Operated Pressure Relief Valve Field Test Accessory
82 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
83 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
84 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
86 MANDATORY APPENDIX I SI (METRIC) UNITS AND CONVERSION FACTORS
87 Tables
Table I-1 SI (Metric) Units
88 Table I-2 Commonly Used Conversion Factors
89 MANDATORY APPENDIX II EXAMPLES OF DETERMINING FLOW RATE UNCERTAINTIES
II-1 PURPOSE
II-2 EXAMPLE DETERMINATION
90 Table II-1 Table of Uncertainty Parameters
Table II-1M Table of Uncertainty Parameters
94 II-3 REFERENCES
95 NONMANDATORY APPENDIX A REFERENCES

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