GB/T 33215-2016 English PDF (GBT33215-2016)

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GB/T 33215-2016: Pressure relief devices for gas cylinders
GB/T 33215-2016
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
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.
3.1.1
pressure relief device; PRD
General name for the pressure relief device installed on the cylinder, to enable the gas
cylinder to discharge gas and release pressure quickly and automatically under
unexpected high temperature conditions, to protect the cylinder shell from explosion.
3.1.2
minimum flow capacity for safety
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.
4.2 Bursting disc device
It is composed of a bursting diaphragm, a clamping ring, and fasteners (for non-
refillable welded cylinders, the diaphragm can be directly welded to the opening of the
cylinder shell). When the gas pressure in the cylinder reaches a predetermined value,
the diaphragm ruptures and the gas in the cylinder is discharged automatically.
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. When the gas pressure in the cylinder reaches a
predetermined value, the valve disc pressed by the spring leaves the valve boss and the
gas in the cylinder is discharged. After the pressure drops to a predetermined value, the
valve disc closes again.
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. The fusible plug is set on the discharge side of the bursting disc. When the
bursting disc pressure reaches the predetermined burst pressure and the ambient
temperature also reaches the predetermined value, the composite device discharges gas
and releases pressure.
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:
a) cylinders for on-board storage of fuel for automotive vehicle;
b) gas cylinders for fire extinguishers;
c) gas cylinders for respirators;
d) dissolve acetylene cylinders;
e) industrial combustible gas cylinders;
f) welded insulated gas cylinders containing cryogenic liquefied gases;
g) cluster gas cylinder groups containing liquefied gas;
h) large-capacity gas cylinders for long-tube trailers and tube-type containers.
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.
5.4 Whether gas cylinders other than those specified in 5.1, 5.2, and 5.3 shall be
equipped with pressure relief devices shall be agreed upon between the user and
manufacturer of the gas cylinder.
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; gas
cylinders containing high-pressure toxic gases should not be equipped with a fusible
plug device separately, but a bursting disc - fusible plug composite device shall be used.
6.2 Gas cylinders containing flammable and combustible gases (the first digit of the
FTSC code in GB/T 16163 is “2”) should be equipped with a safety valve or a
composite device with a safety valve.
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
equipped with two pressure relief devices. The bursting disc is used to prevent the
cylinder shell (liner) from bursting due to the pressure increase caused by high
temperature in a fire environment; and the safety valve is used to prevent the pressure
increase explosion caused by the complete failure of the thermal insulation performance
of the gas cylinder.
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.
7.1.2 The setting of devices shall not hinder the normal use and transportation of gas
cylinders.
7.1.3 The gas discharging reaction force during the operation of devices will not cause
adverse effects.
7.1.4 For gas cylinders containing flammable gases, the structure and installation of
devices shall be such that the exhausted gas i...