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GB/T 18442.6-2019 English PDF (GBT18442.6-2019)
GB/T 18442.6-2019 English PDF (GBT18442.6-2019)
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GB/T 18442.6-2019: Static vacuum insulated cryogenic pressure vessel -- Part 6: Safety device requirements
GB/T 18442.6-2019
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.020.40
J 76
Replacing GB/T 18442.6-2011
Static vacuum insulated cryogenic pressure vessels -
Part 6: Safety protection
ISSUED ON: DECEMBER 31, 2019
IMPLEMENTED ON: DECEMBER 31, 2019
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 6
3 Terms and definitions ... 6
4 Safety accessories, instruments and handling accessories ... 6
Appendix A (Normative) Calculation of safe discharge volume of tank and
discharge capacity of overpressure relief device ... 18
References ... 31
Static vacuum insulated cryogenic pressure vessels -
Part 6: Safety protection
1 Scope
This part of GB/T 18442 specifies the selection principles and setting
requirements of safety accessories, gauges, handling accessories used in
static vacuum insulated cryogenic pressure vessels (hereinafter referred to as
"cryogenic vessels"), as well as the calculation of the safety discharge volume
of tank, the calculation of the discharge capacity of the overpressure relief
device.
This part applies to cryogenic vessels that meet the following conditions at the
same time:
a) The working pressure of the inner vessel is not less than 0.1 MPa;
b) The geometric volume is not less than 1 m3;
c) The insulation method is vacuum powder insulation, vacuum composite
insulation or high vacuum multilayer insulation;
d) The storage medium is a refrigerated liquefied gas with a standard boiling
point not lower than -196 °C.
This part does not apply to cryogenic vessels in the following ranges:
a) The inner vessel and outer shell materials are non-ferrous or non-metallic;
b) Spherical structure;
c) Stacked and insulated;
d) Mobile;
e) Store frozen liquefied gas medium with standard boiling point lower than
-196 °C;
f) The storage medium is a toxic gas according to GB 12268;
g) Special requirements for national defense and military equipment.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB/T 150 (all parts) Pressure vessel
GB/T 567.1 Bursting disc safety device - Part 1: Basic requirements
GB/T 567.2 Bursting disc safety device - Part 2: Application, selection and
installation
GB/T 567.3 Bursting disc safety device - Part 3: Classification and
installation dimensions
GB/T 567.4 Bursting disc safety device - Part 4: Type test
GB/T 18442.1 Stationary vacuum thermal-insulating cryogenic pressure
vessel - Part 1: Rule
GB/T 18442.3 Stationary vacuum thermal-insulating cryogenic pressure
vessel - Part 3: Design
GB/T 18442.5 Stationary vacuum thermal-insulating cryogenic pressure
vessel - Part 5: Inspection and test
GB/T 24918 Cryogenic emergency shutoff valve
GB/T 29026 Spring loaded safety valve for cryogenic service
JB/T 6804 Shock-resistant pressure gauge
TSG 21 Supervision regulation on safety technology for stationary pressure
vessel
3 Terms and definitions
The terms and definitions as defined in GB/T 150, GB/T 18442.1, GB/T 18442.3,
GB/T 18442.5 apply to this document.
4 Safety accessories, instruments and handling
a) The safety valve shall be installed vertically when installing;
b) A shut-off valve should not be installed between the overpressure relief
device and the tank. In order to facilitate the verification, maintenance,
replacement of the overpressure relief device, the shut-off valve can be
installed between the overpressure relief device. Shut-off valve can only
be installed between the overpressure relief device and the tank after
approval by the person in charge of the pressure vessel safety technology
of the user unit and taking reliable preventive measures. During the
normal use and operation of the cryogenic vessel, the shut-off valve shall
be in a fully open state (lead sealed or locked); meanwhile its structure
and diameter shall not affect the safe discharge of the overpressure relief
device.
4.2.1.5 The overpressure relief device of the inner vessel shall be clearly and
permanently marked; the marking content shall include at least:
a) The operating pressure of the overpressure relief device;
b) Rated exhaust capacity or minimum discharge area;
c) Manufacturing license number and mark;
d) The name or marking trademark of the manufacturer.
4.2.2 Safety discharge volume of inner vessel
4.2.2.1 The discharge capacity of the inner vessel’s overpressure relief device
shall not be less than the safe discharge volume required by the inner vessel.
The calculation method for the safe discharge volume of the inner vessel and
the discharge capacity of the overpressure relief device shall be in accordance
with the provisions in Appendix A.
4.2.2.2 When calculating the safety discharge volume required for inner
packaging, at least the following working conditions and possible combinations
shall be considered:
a) The structure of the insulation system is intact and in a normal vacuum
state, the outside is the ambient temperature, the temperature of the inner
vessel is the saturation temperature of the stored medium under the relief
pressure;
b) The structure of the insulation system is intact and in a normal vacuum
state, the outside is the ambient temperature, the temperature of the inner
vessel is the saturation temperature of the stored medium under the relief
pressure, meanwhile the booster system is in a fully open working state;
4.3.1.3 The explosion-proof device shall be able to prevent the blockage of the
insulation material. The explosion-proof device shall be located at the top of the
enclosure as much as possible.
4.3.1.4 The explosion-proof device of the enclosure may adopt a self-tightening
explosion-proof device or a welded bursting disc device. The cover plate of the
self-tightening explosion-proof device shall have corresponding protection
measures. When using a welded rupture disc device, the connection with the
enclosure shall also be welded; there shall be protection measures such as rain
and dust.
4.3.2 The discharge area of enclosure explosion-proof device
The discharge area of the enclosure explosion-proof device is generally not less
than the product of the geometric volume of the inner vessel (m3) and 340
mm2/m3, but it does not have to exceed 5000 mm2.
4.4 Emergency cut-off device
4.4.1 Requirements for setting of emergency shut-off devices
4.4.1.1 Cryogenic vessels storing flammable and explosive media shall be
equipped with emergency shut-off devices as follows, except when it is
confirmed that emergency shut-off devices or other similar emergency shut-off
devices that can prevent a large amount of leakage have been installed in the
engineering system :
a) An emergency shut-off device shall be installed as close as possible to the
tank on the liquid phase inlet and outlet pipelines.
b) The emergency shut-off device generally consists of an emergency shut-
off valve, a remote-control system, a fusible alloy plug. The emergency
cut-off device shall be flexible in action, reliable in performance, easy to
overhaul; meanwhile it shall not be used for othe...
Get QUOTATION in 1-minute: Click GB/T 18442.6-2019
Historical versions: GB/T 18442.6-2019
Preview True-PDF (Reload/Scroll if blank)
GB/T 18442.6-2019: Static vacuum insulated cryogenic pressure vessel -- Part 6: Safety device requirements
GB/T 18442.6-2019
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.020.40
J 76
Replacing GB/T 18442.6-2011
Static vacuum insulated cryogenic pressure vessels -
Part 6: Safety protection
ISSUED ON: DECEMBER 31, 2019
IMPLEMENTED ON: DECEMBER 31, 2019
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 6
3 Terms and definitions ... 6
4 Safety accessories, instruments and handling accessories ... 6
Appendix A (Normative) Calculation of safe discharge volume of tank and
discharge capacity of overpressure relief device ... 18
References ... 31
Static vacuum insulated cryogenic pressure vessels -
Part 6: Safety protection
1 Scope
This part of GB/T 18442 specifies the selection principles and setting
requirements of safety accessories, gauges, handling accessories used in
static vacuum insulated cryogenic pressure vessels (hereinafter referred to as
"cryogenic vessels"), as well as the calculation of the safety discharge volume
of tank, the calculation of the discharge capacity of the overpressure relief
device.
This part applies to cryogenic vessels that meet the following conditions at the
same time:
a) The working pressure of the inner vessel is not less than 0.1 MPa;
b) The geometric volume is not less than 1 m3;
c) The insulation method is vacuum powder insulation, vacuum composite
insulation or high vacuum multilayer insulation;
d) The storage medium is a refrigerated liquefied gas with a standard boiling
point not lower than -196 °C.
This part does not apply to cryogenic vessels in the following ranges:
a) The inner vessel and outer shell materials are non-ferrous or non-metallic;
b) Spherical structure;
c) Stacked and insulated;
d) Mobile;
e) Store frozen liquefied gas medium with standard boiling point lower than
-196 °C;
f) The storage medium is a toxic gas according to GB 12268;
g) Special requirements for national defense and military equipment.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB/T 150 (all parts) Pressure vessel
GB/T 567.1 Bursting disc safety device - Part 1: Basic requirements
GB/T 567.2 Bursting disc safety device - Part 2: Application, selection and
installation
GB/T 567.3 Bursting disc safety device - Part 3: Classification and
installation dimensions
GB/T 567.4 Bursting disc safety device - Part 4: Type test
GB/T 18442.1 Stationary vacuum thermal-insulating cryogenic pressure
vessel - Part 1: Rule
GB/T 18442.3 Stationary vacuum thermal-insulating cryogenic pressure
vessel - Part 3: Design
GB/T 18442.5 Stationary vacuum thermal-insulating cryogenic pressure
vessel - Part 5: Inspection and test
GB/T 24918 Cryogenic emergency shutoff valve
GB/T 29026 Spring loaded safety valve for cryogenic service
JB/T 6804 Shock-resistant pressure gauge
TSG 21 Supervision regulation on safety technology for stationary pressure
vessel
3 Terms and definitions
The terms and definitions as defined in GB/T 150, GB/T 18442.1, GB/T 18442.3,
GB/T 18442.5 apply to this document.
4 Safety accessories, instruments and handling
a) The safety valve shall be installed vertically when installing;
b) A shut-off valve should not be installed between the overpressure relief
device and the tank. In order to facilitate the verification, maintenance,
replacement of the overpressure relief device, the shut-off valve can be
installed between the overpressure relief device. Shut-off valve can only
be installed between the overpressure relief device and the tank after
approval by the person in charge of the pressure vessel safety technology
of the user unit and taking reliable preventive measures. During the
normal use and operation of the cryogenic vessel, the shut-off valve shall
be in a fully open state (lead sealed or locked); meanwhile its structure
and diameter shall not affect the safe discharge of the overpressure relief
device.
4.2.1.5 The overpressure relief device of the inner vessel shall be clearly and
permanently marked; the marking content shall include at least:
a) The operating pressure of the overpressure relief device;
b) Rated exhaust capacity or minimum discharge area;
c) Manufacturing license number and mark;
d) The name or marking trademark of the manufacturer.
4.2.2 Safety discharge volume of inner vessel
4.2.2.1 The discharge capacity of the inner vessel’s overpressure relief device
shall not be less than the safe discharge volume required by the inner vessel.
The calculation method for the safe discharge volume of the inner vessel and
the discharge capacity of the overpressure relief device shall be in accordance
with the provisions in Appendix A.
4.2.2.2 When calculating the safety discharge volume required for inner
packaging, at least the following working conditions and possible combinations
shall be considered:
a) The structure of the insulation system is intact and in a normal vacuum
state, the outside is the ambient temperature, the temperature of the inner
vessel is the saturation temperature of the stored medium under the relief
pressure;
b) The structure of the insulation system is intact and in a normal vacuum
state, the outside is the ambient temperature, the temperature of the inner
vessel is the saturation temperature of the stored medium under the relief
pressure, meanwhile the booster system is in a fully open working state;
4.3.1.3 The explosion-proof device shall be able to prevent the blockage of the
insulation material. The explosion-proof device shall be located at the top of the
enclosure as much as possible.
4.3.1.4 The explosion-proof device of the enclosure may adopt a self-tightening
explosion-proof device or a welded bursting disc device. The cover plate of the
self-tightening explosion-proof device shall have corresponding protection
measures. When using a welded rupture disc device, the connection with the
enclosure shall also be welded; there shall be protection measures such as rain
and dust.
4.3.2 The discharge area of enclosure explosion-proof device
The discharge area of the enclosure explosion-proof device is generally not less
than the product of the geometric volume of the inner vessel (m3) and 340
mm2/m3, but it does not have to exceed 5000 mm2.
4.4 Emergency cut-off device
4.4.1 Requirements for setting of emergency shut-off devices
4.4.1.1 Cryogenic vessels storing flammable and explosive media shall be
equipped with emergency shut-off devices as follows, except when it is
confirmed that emergency shut-off devices or other similar emergency shut-off
devices that can prevent a large amount of leakage have been installed in the
engineering system :
a) An emergency shut-off device shall be installed as close as possible to the
tank on the liquid phase inlet and outlet pipelines.
b) The emergency shut-off device generally consists of an emergency shut-
off valve, a remote-control system, a fusible alloy plug. The emergency
cut-off device shall be flexible in action, reliable in performance, easy to
overhaul; meanwhile it shall not be used for othe...
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