1 Scope
This code provides guidance and rules (including the preparation of test reports) for the operational characteristics (including mechanical properties) and relieving capacity testing of pressure relief devices. Those tests are used to determine the operational characteristics and relieving capacity of pressure relief device which is used to prevent overpressure in boilers, pressure vessels, and associated piping equipment.
There are inlet and outlet conditions for the test procedures of this code, and steam, gas (air) or liquid (water) whose physical properties are known is used as the test medium. This code is applicable to the following types of reclosing and non-reclosing pressure relief devices:
a) safety valve;
b) rupture disk device;
c) breaking/shear pin device;
d) fusible plug device.
Other pressure relief devices may be tested provided all parties to the test agree to accept the provisions of this code.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this code. However parties to agreements based on this code are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition applies.
GB/T 12241 Safety valves - General requirements (GB/T 12241-2005, ISO 4126-1: 1991, MOD)
GB/T 12243 Spring loaded safety valves (GB/T 12243-2005, JIS B 8210: 1994, MOD)
3 Terms
For the purposes of this code, the terms and definitions given in GB/T 12241 apply.
3.1 General
3.1.1
pressure relief device
device designed to prevent internal medium pressure from rising above a predetermined maximum pressure in a pressure vessel exposed to emergency or abnormal conditions
3.1.2
operational characteristics and flow capacity testing
testing of a pressure relief device to determine its operating characteristics including measured relieving capacity
3.1.3
in-service testing
testing of a pressure relief device while protecting the system on which it is installed to determine some or all of its operating characteristics using system pressure solely or in conjunction with an auxiliary lift device or other pressure source
Foreword i
1 Scope
2 Normative references
3 Terms
3.1 General
3.2 Types of pressure relief devices
3.3 Safety valve dimensional characteristics
3.4 Non-reclosing pressure relief device dimensional characteristics
3.5 Operational and flow capacity characteristics of pressure relief device
4 General
5 Operational characteristics and flow capacity testing of pressure release devices
5.1 Testing facility and instrument
5.2 Measurement methods
5.3 Test requirements
5.4 Test procedure
5.5 Computation of results
5.6 Test summary report
6 In-service and bench testing
6.1 Instruments and methods of measurements
6.2 In-service testing procedures
6.3 Bench testing procedures
6.4 Seat tightness test
6.5 Computation of results
6.6 Test summary report
Annex A (Informative) Test report form
A.1 Symbolic description of test record
A.2 Test report form
Table A.1 Test report form for pressure relief device tested with steam and water - Weighed-water method
Table A.2 Test report form for pressure relief device tested with steam - Flow-meter method
Table A.3 Test report form for pressure relief device tested with liquid - Flow-meter method
Table A.4 Test report form for pressure relief device tested with air or other gases - Flow-meter method
Table A.5 Test report form for pressure relief device tested with air or other gases - Sonic-flow method
Table A.6 Test report form for pressure relief device tested with fuel gas - Flow-meter method
Table A.7 Test report form for rupture disk device tested with air - Resistance coefficient method
Annex B (Informative) Test summary report form
Table B.1 Test summary report form of pressure relief valve - Steam medium
Table B.2 Test summary report form of pressure relief valve - Water or liquid medium
Table B.3 Test summary report form of pressure relief valve - Air, gas or fuel gas medium
Table B.4 Test summary report form of rupture disk device - Air, gas or fuel gas medium
Annex C (Informative) Examples of flow error determination
1 Scope
This code provides guidance and rules (including the preparation of test reports) for the operational characteristics (including mechanical properties) and relieving capacity testing of pressure relief devices. Those tests are used to determine the operational characteristics and relieving capacity of pressure relief device which is used to prevent overpressure in boilers, pressure vessels, and associated piping equipment.
There are inlet and outlet conditions for the test procedures of this code, and steam, gas (air) or liquid (water) whose physical properties are known is used as the test medium. This code is applicable to the following types of reclosing and non-reclosing pressure relief devices:
a) safety valve;
b) rupture disk device;
c) breaking/shear pin device;
d) fusible plug device.
Other pressure relief devices may be tested provided all parties to the test agree to accept the provisions of this code.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this code. However parties to agreements based on this code are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition applies.
GB/T 12241 Safety valves - General requirements (GB/T 12241-2005, ISO 4126-1: 1991, MOD)
GB/T 12243 Spring loaded safety valves (GB/T 12243-2005, JIS B 8210: 1994, MOD)
3 Terms
For the purposes of this code, the terms and definitions given in GB/T 12241 apply.
3.1 General
3.1.1
pressure relief device
device designed to prevent internal medium pressure from rising above a predetermined maximum pressure in a pressure vessel exposed to emergency or abnormal conditions
3.1.2
operational characteristics and flow capacity testing
testing of a pressure relief device to determine its operating characteristics including measured relieving capacity
3.1.3
in-service testing
testing of a pressure relief device while protecting the system on which it is installed to determine some or all of its operating characteristics using system pressure solely or in conjunction with an auxiliary lift device or other pressure source
Contents of GB/T 12242-2005
Foreword i
1 Scope
2 Normative references
3 Terms
3.1 General
3.2 Types of pressure relief devices
3.3 Safety valve dimensional characteristics
3.4 Non-reclosing pressure relief device dimensional characteristics
3.5 Operational and flow capacity characteristics of pressure relief device
4 General
5 Operational characteristics and flow capacity testing of pressure release devices
5.1 Testing facility and instrument
5.2 Measurement methods
5.3 Test requirements
5.4 Test procedure
5.5 Computation of results
5.6 Test summary report
6 In-service and bench testing
6.1 Instruments and methods of measurements
6.2 In-service testing procedures
6.3 Bench testing procedures
6.4 Seat tightness test
6.5 Computation of results
6.6 Test summary report
Annex A (Informative) Test report form
A.1 Symbolic description of test record
A.2 Test report form
Table A.1 Test report form for pressure relief device tested with steam and water - Weighed-water method
Table A.2 Test report form for pressure relief device tested with steam - Flow-meter method
Table A.3 Test report form for pressure relief device tested with liquid - Flow-meter method
Table A.4 Test report form for pressure relief device tested with air or other gases - Flow-meter method
Table A.5 Test report form for pressure relief device tested with air or other gases - Sonic-flow method
Table A.6 Test report form for pressure relief device tested with fuel gas - Flow-meter method
Table A.7 Test report form for rupture disk device tested with air - Resistance coefficient method
Annex B (Informative) Test summary report form
Table B.1 Test summary report form of pressure relief valve - Steam medium
Table B.2 Test summary report form of pressure relief valve - Water or liquid medium
Table B.3 Test summary report form of pressure relief valve - Air, gas or fuel gas medium
Table B.4 Test summary report form of rupture disk device - Air, gas or fuel gas medium
Annex C (Informative) Examples of flow error determination
