GB/T 33215-2025 (GB/T 33215-2016) PDF English
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GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.020.30
J 74
GB/T 33215-2016
Pressure relief devices for gas cylinders
Issued on. DECEMBER 13, 2016
Implemented on. JULY 01, 2017
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms, definitions, and symbols... 4
4 Types and structural types of pressure relief devices... 6
5 Principles for setting up pressure relief devices for gas cylinders... 6
6 Principles for selection of pressure relief devices... 7
7 Basic requirements for pressure relief devices... 8
8 Minimum flow capacity for safety of gas cylinders and certified capacity of pressure
relief devices... 9
9 Principles for determining the operating pressure or temperature of pressure relief
devices... 10
10 Installation and maintenance of pressure relief devices... 11
Annex A (informative) Calculation methods for compressibility coefficient of high-
pressure gases... 12
Bibliography... 15
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
Attention is drawn to the possibility that some of the elements of this document may be
the subject of patent rights. The issuing authority of this document shall not be held
responsible for identifying any or all such patent rights.
This Standard was proposed by and shall be under the jurisdiction of National Technical
Committee on Gas Cylinders of Standardization Administration of China (SAC/TC 31).
Drafting organizations of this Standard. Ningbo Sanan Valve Co., Ltd., Jinhua Yonghui
Precision Machinery Co., Ltd., Beijing Tianhai Industry Co., Ltd., China Special
Equipment Inspection and Research Institute, Shanghai Special Equipment Supervision
and Inspection Technology Research Institute, Dalian Boiler and Pressure Vessel
Inspection Institute.
Main drafters of this Standard. Wu Yueshen, Huang Qianghua, Zhang Baoguo, Hu Jun,
Weng Guodong, Shi Lei, Shao Yongqing, Sun Li, Wang Yanhui.
Pressure relief devices for gas cylinders
1 Scope
This Standard specifies the type, structural type, setting principles, selection principles,
basic requirements, calculation of minimum flow capacity for safety and certified
capacity of pressure relief devices, principles for determining operating pressure or
temperature, installation and maintenance, etc. of pressure relief devices for gas
cylinders.
This Standard applies to gas cylinders of various structural types and containing various
types of 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 13005 Terminology of gas cylinders
GB/T 16163 Classification of gases filled in cylinder
3 Terms, definitions, and symbols
3.1 Terms and definitions
For the purpose of this document, the terms and definitions defined in GB/T 13005 and
the following apply.
3.2 Symbols
For the purpose of this document, the following symbols apply.
4 Types and structural types of pressure relief devices
4.1 Fusible plug device
It is composed of a fusible plug and a plug boss. The plug boss is connected to the
cylinder shell or valve body. When the temperature reaches a predetermined value, the
fusible alloy melts and the gas is discharged.
4.3 Safety valve
A pressure control device that can be opened and closed repeatedly, composed of a
valve boss, a valve disc, and a spring.
4.4 Bursting disc - fusible plug composite device
A safety pressure relief device composed of a bursting disc and a fusible plug connected
in series.
4.5 Bursting disc - safety valve composite device
A pressure relief device composed 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 breaks first, and the discharged gas causes the safety valve to open, and the high-
pressure gas is automatically discharged.
5 Principles for setting up pressure relief devices for gas cylinders
5.1 The following gas cylinders shall be equipped with pressure relief devices.
5.2 Gas cylinders containing highly toxic gases (the second digit of the FTSC code in
GB/T 16163 is “3”) and self-igniting gases are prohibited from installing pressure relief
devices. Liquid chlorine cylinders do not need to be equipped with pressure relief
devices.
5.3 Non-industrial liquefied petroleum gas cylinders are not equipped with pressure
relief devices.
6 Principles for 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 a safety valve separately; gas cylinders
containing low-pressure toxic gases may be equipped with a fusible plug device;
6.3 Gas cylinders containing flammable gases that are prone to decomposition or
polymerization (the first digit of the FTSC code in GB/T 16163 is “5”) should be
equipped with a fusible plug device.
6.4 Welded insulated gas cylinders containing cryogenic liquefied gases shall be
7 Basic requirements for pressure relief devices
7.1 Requirements for design and structure of pressure relief devices
7.1.1 The structure of devices shall be suitable for the use environment and conditions.
7.2 Requirements for materials of pressure relief devices
7.2.1 For materials from which parts are made, the chemical composition and physical
properties shall be uniform.
7.2.2 For components or parts that may come into contact with the medium in the
cylinder, the materials and media shall have good compatibility and corrosion resistance.
7.2.3 Bursting discs shall be made of pure metal sheets (nickel, copper) or alloy sheets
(such as nickel-chromium stainless steel, brass, bronze, etc.) with uniform texture.
7.3 Requirements for installation locations of pressure relief devices
7.3.1 The pressure relief device of seamless gas cylinders shall be installed on the
cylinder valve.
7.3.2 The pressure relief device of welded gas cylinders can be installed on the cylinder
valve, or can be installed separately on the valve boss or head of the gas cylinder.
8 Minimum flow capacity for safety of gas cylinders and certified capacity of pressure relief devices
8.1 The minimum flow capacity for safety of a gas cylinder is calculated based on its
structural type and the properties of the medium it contains according to the following
formula.
8.1.3 For welded insulated gas cylinders containing cryogenic liquefied gas, the
minimum flow capacity of the gas cylinder is determined by the corresponding gas
cylinder product standards.
8.2 The certified capacity of pressure relief devices is calculated according to formula
(3).
8.3 The certified capacity, Wr, of the pressure relief device installed on the gas cylinder
shall not be less than the minimum flow capacity for safety, Ws, of the gas cylinder. For
a gas cylinder that are specified to be equipped with pressure relief devices on the seals
at both ends, the certified capacity at either end shall not be less than 50 % of the
minimum flow capacity for safety, Ws, of the gas cylinder.
9 Principles for determining the operating pressure or temperature of pressure relief devices
9.1 The operating pressure of bursting disc devices shall meet the following requirements.
9.1.1 The design burst pressure of bursting disc devices is the hydraulic test pressure of
gas cylinders.
9.2 The requirements for safety valves shall meet the following requirements.
9.2.1 The set pressure (opening pressure) of safety valves shall not be less than 75 % of
the hydraulic test pressure of the gas cylinder, nor shall it be greater than 100 % of the
hydraulic test pressure; if there are other provisions in the gas cylinder product
standards, those provisions shall prevail.
9.3 For fusible plugs or fusible alloy used in bursting disc - fusible plug composite
devices, the operating temperature is specified by the gas cylinder product standards.
10 Installation and maintenance of pressure relief devices
10.1 There must be no stop valve installed between the gas cylinder pressure relief
device and the gas cylinder, nor on the outlet side of the device, nor any other parts that
may hinder the normal operation of the device.
10.2 When using gas cylinders, the pressure relief device shall be kept in good condition.
It shall prevent the device from being corroded or blocked by sand, paint, or dirt,
causing it to malfunction.
10.4 Safety valves on gas cylinders shall be cleaned, inspected, and calibrated regularly.
Bursting disc devices (or bursting discs) shall be replaced regularly. The service life of
bursting discs is determined by the manufacturer, but it shall not exceed the periodic
inspection cycle of the gas cylinder.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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