Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This standard is prepared in accordance with the rules given in GB/T 1.1-2009.
This standard has been redrafted and modified in relation to ISO 15848-1:2015 Industrial valves - Measurement, test and qualification procedures for fugitive emissions - Part 1: Classification system and qualification procedures for type testing of valves.
Technical differences have been made with respect to ISO 15848-1:2015, and corresponding technical differences and their reasons are as follows:
a) the adjustments of technical deviations are made for the normative references in this standard so as to adapt to the technical conditions of China. The adjustments are mainly reflected in Clause 2 "Normative references", with the specific adjustments as follows:
ISO 5208 has been replaced by GB/T 13927, which is modified in relation to the international standard (see 5.1.1);
EN 13185:2001 has been deleted (the necessary content has been elaborated in the standard);
GB/T 21465 has been added for reference (see Clause 3).
b) some terms in Clause 3 of ISO 15848-1:2015, already specified in GB/T 21465, have been deleted, and the terms and definitions of "static test" and "mechanical cycle test" appearing in the text have been added.
c) the abbreviation "Mair" in Clause 4 of ISO 15848-1:2015 which is not used in this standard has been deleted, and CC and other abbreviations that appeared in this standard have been added.
d) the allowable values and parameters with Pa·m3·s-1 as the unit for leak rate in Table 1, A.1.7, A.2.7, Table C.1 and Table C.2 of ISO 15848-1:2015 have been converted to meet the practical needs of China.
e) description on valve product marking in the 6.6 of ISO 15848-1:2015 "ISO FE...-ISO 15848-1" has been changed to "GB FE...-GB/T 40079", and test pressure unit "bar" has been converted to the pressure unit "MPa" to meet the practical needs of China.
The following editorial changes are made in this standard:
——the standard name is changed to "Classification system and qualification procedures for fugitive emission type testing of valves".
——the standards ISO 15848-1:2015+Al: 2017 are included.
——the original references have been deleted, as the original standard only cited some concepts, which have been expressed in this standard.
This standard was proposed by China Machinery Industry Federation.
This standard is under the jurisdiction of National Technical Committee on Valve of Standardization Administration of China (SAC/TC 188).
Classification system and qualification procedures for fugitive emission type testing of valves
1 Scope
This standard specifies the type test requirements for valves used for fugitive fluids, as well as classification system and qualification procedures for fugitive emission type testing of valves.
It specifies testing procedures for evaluation of external leakage of valve stem seals (or shaft) and body joints of isolating valves and control valves intended for application in volatile air pollutants and hazardous fluids.
End connection joints, vacuum application, effects of corrosion, and radiation are excluded from this standard.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 13927 Industrial valves - Pressure testing
GB/T 21465 Terminology for valves
3 Terms and Definitions
For the purposes of this document, the terms and definitions given in GB/T 21465, as well as the following definitions, apply.
3.1
body seals
any seal in pressure containing part except stem (or shaft) seals
3.2
concentration
ratio of test fluid volume to the gas mixture volume measured at the leak source(s) of the test valve
Note: the unit of concentration is a dimensionless unit (volume per million or volume fraction is 1×10-6), expressed in ppmv.1 ppmv = 1 mL/m3 = 1 cm3 /m3.
3.3
control valve
power operated device which changes the fluid flow rate in a process control system
Note: The device consists of a valve connected to an actuator that is capable of changing the position of a closure member in the valve in response to a signal from the controlling system.
3.4
fugitive emission
chemical or mixture of chemicals, in any physical form, which represents an unanticipated or spurious leakage from equipment on an industrial site
3.5
leakage
loss of the test fluid through the stem (or shaft) seal or body seal(s) of a test valve under the specified test conditions
Note: Leakage is generally expressed as a concentration or a leak rate.
3.6
leak rate
mass flow rate of the test fluid per unit length
Note: The leak rate can be expressed in milligrams per second millimeter (mg·s-1·mm-1) through stem seal system or volumetric flow rate of the test fluid, expressed in millibar liters per second millimeter (mbar·L·s-1·mm-1) through stem seal system.
3.7
local leakage
measurement of the test fluid leakage using a sniffer probe at the leak source point
3.8
mechanical cycle of control valve
for linear/rotary control valves, test cycles performed at 50% of stroke/angle with an amplitude of ± 10% of full stroke/angle
3.9
mechanical cycle of isolating valve
motion of a valve obturator moving from fully closed position to fully opened position, and returning to fully closed position
3.10
isolating valve
valve intended for use principally in the closed or open position which can be power actuated or manually operated
3.11
performance class
level of the performance composed of tightness class, endurance class and temperature class of a test valve
Note: The performance classes are defined in Clause 6.
3.12
room temperature
temperature in the range of +5°C to +40°C prior to the test
3.13
stem seal
shaft seal
component(s) installed around the valve stem (or shaft) to avoid leakage of internal fluids to atmosphere
3.14
test pressure
pressure used for testing the valve
Note: Unless otherwise specified, test pressure is the rated pressure specified at the test temperature and the shell material of a test valve in the relevant standards.
3.15
test temperature
fluid temperature selected for the test as measured inside the test valve
Note: The test temperature is given in Table 5.
3.16
thermal cycle
change of the temperature from the room temperature to the specified test temperature and return to room temperature
3.17
total leakage
collection of leakage of the test fluid at the leak source using an encapsulation method
3.18
type test
test conducted to establish the performance class of a valve
3.19
static test
test conducted under the specified temperature and test pressure to test the sealing performance of the valve stem without operating the valve
3.20
mechanical cycle test
test conducted under the specified temperature and test pressure to test the sealing performance of the valve stem by completing a specified number of switching (or adjustment) operations on the valve
4 Abbreviations
For the purposes of this document, the following abbreviations apply.
AH: fugitive emission Class A with Helium.
AM: fugitive emission Class A with Methane.
BH: fugitive emission Class B with Helium.
BM: fugitive emission Class B with Methane.
CC: mechanical-cycle classes for control valves.
CH: fugitive emission Class C with Helium.
CM: fugitive emission Class C with Methane.
CO: mechanical-cycle classes for isolating valves.
FE: fugitive emission.
GB: National Standard of the People's Republic of China.
RT: room temperature.
SSA: stem seal adjustment.
tRT(100°C): test temperature is 100°C, the valve is qualified at tRT.
Foreword i
1 Scope
2 Normative references
3 Terms and Definitions
4 Abbreviations
5 Type tests
5.1 Test conditions
5.2 Test procedure
6 Performance classes
6.1 Classification criteria
6.2 Tightness classes
6.3 Endurance classes
6.4 Temperature classes
6.5 Examples of class designation
6.6 Examples of marking
7 Reporting
8 Extension of qualification to untested valves
Annex A (Normative) Total leak rate measurement
Annex B (Normative) Sniffing method
Annex C (Informative) Leak rate conversion (helium)
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This standard is prepared in accordance with the rules given in GB/T 1.1-2009.
This standard has been redrafted and modified in relation to ISO 15848-1:2015 Industrial valves - Measurement, test and qualification procedures for fugitive emissions - Part 1: Classification system and qualification procedures for type testing of valves.
Technical differences have been made with respect to ISO 15848-1:2015, and corresponding technical differences and their reasons are as follows:
a) the adjustments of technical deviations are made for the normative references in this standard so as to adapt to the technical conditions of China. The adjustments are mainly reflected in Clause 2 "Normative references", with the specific adjustments as follows:
ISO 5208 has been replaced by GB/T 13927, which is modified in relation to the international standard (see 5.1.1);
EN 13185:2001 has been deleted (the necessary content has been elaborated in the standard);
GB/T 21465 has been added for reference (see Clause 3).
b) some terms in Clause 3 of ISO 15848-1:2015, already specified in GB/T 21465, have been deleted, and the terms and definitions of "static test" and "mechanical cycle test" appearing in the text have been added.
c) the abbreviation "Mair" in Clause 4 of ISO 15848-1:2015 which is not used in this standard has been deleted, and CC and other abbreviations that appeared in this standard have been added.
d) the allowable values and parameters with Pa·m3·s-1 as the unit for leak rate in Table 1, A.1.7, A.2.7, Table C.1 and Table C.2 of ISO 15848-1:2015 have been converted to meet the practical needs of China.
e) description on valve product marking in the 6.6 of ISO 15848-1:2015 "ISO FE...-ISO 15848-1" has been changed to "GB FE...-GB/T 40079", and test pressure unit "bar" has been converted to the pressure unit "MPa" to meet the practical needs of China.
The following editorial changes are made in this standard:
——the standard name is changed to "Classification system and qualification procedures for fugitive emission type testing of valves".
——the standards ISO 15848-1:2015+Al: 2017 are included.
——the original references have been deleted, as the original standard only cited some concepts, which have been expressed in this standard.
This standard was proposed by China Machinery Industry Federation.
This standard is under the jurisdiction of National Technical Committee on Valve of Standardization Administration of China (SAC/TC 188).
Classification system and qualification procedures for fugitive emission type testing of valves
1 Scope
This standard specifies the type test requirements for valves used for fugitive fluids, as well as classification system and qualification procedures for fugitive emission type testing of valves.
It specifies testing procedures for evaluation of external leakage of valve stem seals (or shaft) and body joints of isolating valves and control valves intended for application in volatile air pollutants and hazardous fluids.
End connection joints, vacuum application, effects of corrosion, and radiation are excluded from this standard.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 13927 Industrial valves - Pressure testing
GB/T 21465 Terminology for valves
3 Terms and Definitions
For the purposes of this document, the terms and definitions given in GB/T 21465, as well as the following definitions, apply.
3.1
body seals
any seal in pressure containing part except stem (or shaft) seals
3.2
concentration
ratio of test fluid volume to the gas mixture volume measured at the leak source(s) of the test valve
Note: the unit of concentration is a dimensionless unit (volume per million or volume fraction is 1×10-6), expressed in ppmv.1 ppmv = 1 mL/m3 = 1 cm3 /m3.
3.3
control valve
power operated device which changes the fluid flow rate in a process control system
Note: The device consists of a valve connected to an actuator that is capable of changing the position of a closure member in the valve in response to a signal from the controlling system.
3.4
fugitive emission
chemical or mixture of chemicals, in any physical form, which represents an unanticipated or spurious leakage from equipment on an industrial site
3.5
leakage
loss of the test fluid through the stem (or shaft) seal or body seal(s) of a test valve under the specified test conditions
Note: Leakage is generally expressed as a concentration or a leak rate.
3.6
leak rate
mass flow rate of the test fluid per unit length
Note: The leak rate can be expressed in milligrams per second millimeter (mg·s-1·mm-1) through stem seal system or volumetric flow rate of the test fluid, expressed in millibar liters per second millimeter (mbar·L·s-1·mm-1) through stem seal system.
3.7
local leakage
measurement of the test fluid leakage using a sniffer probe at the leak source point
3.8
mechanical cycle of control valve
for linear/rotary control valves, test cycles performed at 50% of stroke/angle with an amplitude of ± 10% of full stroke/angle
3.9
mechanical cycle of isolating valve
motion of a valve obturator moving from fully closed position to fully opened position, and returning to fully closed position
3.10
isolating valve
valve intended for use principally in the closed or open position which can be power actuated or manually operated
3.11
performance class
level of the performance composed of tightness class, endurance class and temperature class of a test valve
Note: The performance classes are defined in Clause 6.
3.12
room temperature
temperature in the range of +5°C to +40°C prior to the test
3.13
stem seal
shaft seal
component(s) installed around the valve stem (or shaft) to avoid leakage of internal fluids to atmosphere
3.14
test pressure
pressure used for testing the valve
Note: Unless otherwise specified, test pressure is the rated pressure specified at the test temperature and the shell material of a test valve in the relevant standards.
3.15
test temperature
fluid temperature selected for the test as measured inside the test valve
Note: The test temperature is given in Table 5.
3.16
thermal cycle
change of the temperature from the room temperature to the specified test temperature and return to room temperature
3.17
total leakage
collection of leakage of the test fluid at the leak source using an encapsulation method
3.18
type test
test conducted to establish the performance class of a valve
3.19
static test
test conducted under the specified temperature and test pressure to test the sealing performance of the valve stem without operating the valve
3.20
mechanical cycle test
test conducted under the specified temperature and test pressure to test the sealing performance of the valve stem by completing a specified number of switching (or adjustment) operations on the valve
4 Abbreviations
For the purposes of this document, the following abbreviations apply.
AH: fugitive emission Class A with Helium.
AM: fugitive emission Class A with Methane.
BH: fugitive emission Class B with Helium.
BM: fugitive emission Class B with Methane.
CC: mechanical-cycle classes for control valves.
CH: fugitive emission Class C with Helium.
CM: fugitive emission Class C with Methane.
CO: mechanical-cycle classes for isolating valves.
FE: fugitive emission.
GB: National Standard of the People's Republic of China.
RT: room temperature.
SSA: stem seal adjustment.
tRT(100°C): test temperature is 100°C, the valve is qualified at tRT.
Contents of GB/T 40079-2021
Foreword i
1 Scope
2 Normative references
3 Terms and Definitions
4 Abbreviations
5 Type tests
5.1 Test conditions
5.2 Test procedure
6 Performance classes
6.1 Classification criteria
6.2 Tightness classes
6.3 Endurance classes
6.4 Temperature classes
6.5 Examples of class designation
6.6 Examples of marking
7 Reporting
8 Extension of qualification to untested valves
Annex A (Normative) Total leak rate measurement
Annex B (Normative) Sniffing method
Annex C (Informative) Leak rate conversion (helium)
