GB/T 33215-2025 PDF English
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| GB/T 33215-2025 | English | 335 |
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Pressure relief devices for gas cylinders
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| GB/T 33215-2016 | English | 270 |
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GB/T 33215-2025: Pressure relief devices for gas cylinders---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT33215-2025
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.020.30
CCS J 74
GB/T 33215-2025
Replacing GB/T 33215-2025
Pressure relief devices for gas cylinders
Issued on: AUGUST 29, 2025
Implemented on: MARCH 01, 2026
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms, definitions, and symbols... 5
4 Types and structural types of pressure relief devices... 7
5 Requirements for the installation of pressure relief devices... 8
6 Requirements for the selection of pressure relief devices... 9
7 Basic requirements for pressure relief devices... 10
8 Minimum flow capacity for safety and rated capacity of pressure relief devices... 12
9 Requirements for the determination of operating pressure and operating temperature
of pressure relief devices... 14
10 Marking, installation, and maintenance of pressure relief devices... 15
Annex A (informative) Compressibility coefficients of gases... 16
Bibliography... 23
Pressure relief devices for gas cylinders
1 Scope
This document specifies the types and structural types, installation requirements,
selection requirements, basic requirements, calculation of minimum flow capacity for
safety and rated capacity, requirements for the determination of operating pressure or
operating temperature, as well as marking, installation, and maintenance of pressure
relief devices for gas cylinders.
This document applies to gas cylinders of various structures and types containing
various gases.
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 of the referenced document (including any amendments) applies.
GB/T 8337 Fusible plug device for gas cylinders
GB/T 13005 Terminology of gas cylinders
GB/T 16918 Bursting disc safety devices for gas cylinders
GB/T 17268 Non-refillable steel welded cylinders for industrial use
GB 18428 Glass bulbs used for automatic fire extinguishing systems
GB/T 42536 Assembly valve on high pressure hydrogen storage cylinder for
vehicles
3 Terms, definitions, and symbols
For the purpose of this document, the terms and definitions defined in GB/T 13005 and
the following apply.
3.1 Terms and definitions
3.1.1
pressure relief device
M. the molar mass of the medium contained in the cylinder, in kilograms per kilomole
(kg/kmol);
P. the discharge pressure (absolute pressure), in megapascals (MPa);
NOTE. For bursting disc devices, this is the design bursting pressure; for TPRDs, when the medium
in the cylinder is liquefied gas, this is the saturated vapor pressure of the medium contained at its
operating temperature; when the medium in the cylinder is compressed gas, this is the ideal pressure
at its operating temperature; for safety valves, this is the rated discharge pressure.
Pc. the critical pressure (absolute pressure), in megapascals (Mpa);
q. the latent heat of vaporization of the medium contained in the cylinder at the
discharge pressure, in kilojoules per kilogram (kJ/kg);
T. the temperature of the medium at the discharge pressure (absolute temperature), in
Kelvin (K);
Tc. the critical temperature (absolute temperature), in Kelvin (K);
V. the nominal volume of the gas cylinder, in liters (L);
Wr. the rated capacity of the pressure relief device, in kilograms per hour (kg/h);
Ws. the minimum flow capacity for safety of the gas cylinder, in kilograms per hour
(kg/h);
Z. the compressibility coefficient of the gas at absolute pressure P and absolute
temperature T.
4 Types and structural types of pressure relief devices
4.1 Fusible plug device
It is composed of a fusible alloy and a plug seat. The plug seat is directly connected to
the shell or valve body. When the temperature reaches a predetermined value, the
fusible alloy melts and release the gas within the cylinder directly. Fusible plug devices
shall comply with the requirements of GB/T 8337.
4.2 Fusible alloy activated device
It is composed of a fusible alloy and an actuator. The actuator is connected to the valve
body. When the temperature reaches a predetermined value, the fusible alloy melts,
triggering the actuator to activate and release the gas within the cylinder.
4.3 Glass bulb activated device
It is composed of a glass bulb (also called a glass ball), a support, and an actuator. The
actuator is connected to the valve body. When the temperature reaches a predetermined
value, the glass bulb shatters, triggering the actuator to activate and release the gas
within the cylinder.
4.4 Bursting disc device
It is composed of a bursting disc, a clamping ring, and fasteners (for non-refillable steel
welded cylinders, the disc can be welded directly to the opening in the shell). When the
gas pressure in the cylinder reaches a predetermined value, the disc ruptures, releasing
the gas within the cylinder. The bursting disc device shall comply with the requirements
of GB/T 16918.
4.5 Safety valve
A reversible pressure control device consisting of a valve boss, a valve disc, and a spring.
When the gas pressure in the cylinder reaches a predetermined value, the valve disc,
compressed by the spring, moves away from the valve boss, releasing the gas within
the cylinder. When the pressure drops to a predetermined value, the valve disc recloses.
4.6 Bursting disc-fusible plug composite device
A pressure relief device consisting of a bursting disc and a fusible plug connected in
series. The fusible plug is positioned on the discharge side of the bursting disc. When
the temperature reaches a predetermined value, the gas pressure in the cylinder also
reaches a predetermined value, the fusible alloy melts and the bursting disc ruptures,
releasing the gas within the cylinder.
4.7 Bursting disc-safety valve composite device
A pressure relief device consisting of a bursting disc and a safety valve connected in
series. When the gas pressure in the cylinder reaches a predetermined value, the bursting
disc ruptures first, and the released gas opens the safety valve, releasing the gas within
the cylinder.
5 Requirements for the installation of pressure relief devices
5.1 The following gas cylinders shall be equipped with pressure relief devices.
a) cylinders for on-board storage of fuel for automotive vehicle;
b) cylinders for metal hydride reversible hydrogen storage and release systems;
c) fiber-wound gas cylinders containing compressed gases and high-pressure
liquefied gases;
d) acetylene cylinders;
e) welded insulated gas cylinders;
f) bundles containing liquefied gases;
g) large-volume gas cylinders for tube trailers and tube bundle containers;
h) non-refillable steel welded cylinders.
5.2 Gas cylinders containing pyrophoric gases (the first digit of the FTSC code in GB/T
16163 is “3”) or highly toxic gases (the second digit of the FTSC code in GB/T 16163
is “3”) shall not be equipped with pressure relief devices.
5.3 Gas cylinders containing acidic corrosive gases that form hydrohalic acids (the
fourth digit of the FTSC code in GB/T 16163 is “3”) may not be equipped with pressure
relief devices.
5.4 Civilian liquefied petroleum gas cylinders and civilian liquefied dimethyl ether
cylinders shall not be equipped with pressure relief devices.
5.5 Nitrogen, inert gas, and oxygen cylinders (excluding fiber-wound gas cylinders) are
generally not equipped with pressure relief devices.
5.6 Whether or not to install pressure relief devices on gas cylinders other than those
specified above shall be proposed by the user unit and determined through consultation
between the gas cylinder manufacturer and the safety accessory manufacturer.
6 Requirements for the selection of pressure relief devices
6.1 Gas cylinders containing toxic gases (the second digit of the FTSC code in GB/T
16163 is “2”) shall not be equipped with separate safety valves; gas cylinders containing
low-pressure toxic gases may be equipped with fusible plug devices; gas cylinders
containing high-pressure toxic gases shall use bursting disc-fusible plug composite
devices.
6.2 Gas cylinders containing flammable and combustible low-pressure liquefied gases
(the first digit of the FTSC code in GB/T 16163 is “2”) should be equipped with safety
valves or composite devices with a safety valve.
6.3 Gas cylinders containing combustible gases that are easily decomposed or
polymerized (the first digit of the FTSC code in GB/T 16163 is “5”) shall be equipped
with fusible plug devices.
6.4 Cryogenic insulated gas cylinders containing liquefied natural gas and other
flammable gases shall be equipped with at least two parallel safety valves; welded
insulated cylinders containing other cryogenic liquefied gases shall be equipped with
parallel bursting disc devices and safety valves. The bursting disc device is used to
prevent the shell (liner) from bursting due to pressure buildup caused by high
temperatures in a fire environment; the safety valve is used to prevent explosion caused
by pressure buildup due to complete failure of the gas cylinder’s insulation.
6.5 Liquefied petroleum gas cylinders for vehicles and liquefied dimethyl ether
cylinders for vehicles shall be equipped with a combination valve with a safety valve
or a separate safety valve.
6.6 Compressed natural gas cylinders for vehicles with seamless steel structures and
metal liner fiber-wound structures shall be equipped with bursting disc-fusible plug
composite devices.
6.7 Compressed hydrogen cylinders for vehicles shall be equipped with TPRDs.
6.8 Non-refillable steel welded cylinders shall be equipped with bursting discs.
6.9 Fiber-wound gas cylinders for breathing apparatus shall be equipped with bursting
discs.
6.10 Seamless steel gas cylinder bundles containing liquefied gases shall be equipped
with safety valves.
6.11 Other gas cylinders shall be equipped with appropriate pressure relief devices in
accordance with relevant product standards.
7 Basic requirements for pressure relief devices
7.1 Design requirements
7.1.1 The structure of the device shall be appropriate for the operating environment and
conditions.
7.1.2 The installation of the device shall not hinder the normal use and handling of the
gas cylinder.
7.1.3 The exhaust reaction force generated when the device is opened shall not
adversely affect the gas cylinder.
7.1.4 For gas cylinders containing flammable gases, the structure and installation of the
device shall ensure that the exhausted gas is discharged directly into the atmosphere,
minimizing unnecessary obstruction or impact on other equipment.
7.1.5 The device shall have good sealing performance under normal operating
conditions.
7.1.6 The TPRD installed in compressed hydrogen cylinders for vehicles shall comply
with the requirements of GB/T 42536, and the glass bulb shall use the products
manufactured in accordance with GB 18428.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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