GB/T 33215-2025 Pressure relief devices for gas cylinders English, Anglais, Englisch, Inglés, えいご
Pressure relief devices for gas cylinders
1 Scope
This document specifies the types, structural types, setting requirements, selection requirements, basic requirements, calculation of minimum flow capacity for safety and rated capacity, determination requirements of operating pressure or operating temperature, as well as marking, installation and maintenance of pressure relief devices for gas cylinders.
This document is applicable to gas cylinders of various structural types and those containing various gases.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (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
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 13005 and the following apply.
3.1.1
pressure relief device
pressure relief device installed on a gas cylinder to enable rapid automatic venting and pressure relief under unexpected high-temperature conditions, thereby protecting the shell from bursting
Note: It includes pressure relief devices activated by temperature or pressure.
3.1.2
minimum flow capacity for safety
minimum flow required to be relieved to prevent the gas pressure in a cylinder from continuing to rise after reaching the allowable pressure of the cylinder under unexpected high-temperature conditions
3.1.3
rated capacity
mass of gas that can be discharged by a pressure relief device per unit time under set relief conditions
3.1.4
thermally activated pressure relief device; TPRD
pressure relief device activated by temperature
Note: It includes fusible plug device, fusible alloy activated device and glass bulb activated device.
3.1.5
vent area
geometric flow area of the minimum cross section of a pressure relief device used for discharging the medium
3.2 Symbols
For the purposes of this document, the following symbols apply.
A the vent area of the pressure relief device, mm2;
A0 the external surface area of the gas cylinder shell, m2;
C the characteristic coefficient of gas;
K the relief coefficient of the pressure relief device;
k the adiabatic index of the gas;
M the molar mass of the medium contained in the cylinder, kg/kmol;
P the relief pressure (absolute pressure), MPa;
Note: For bursting disc devices, it is the design burst pressure; for TPRD, when the medium in the cylinder is liquefied gas, it is the saturated vapor pressure of the medium at the operating temperature; for safety valves, it is rated relief pressure.
Contents
Foreword i
1 Scope
2 Normative references
3 Terms, definitions and symbols
4 Types and structural types of pressure relief devices
5 Setting requirements of pressure relief devices
6 Selection requirements of pressure relief devices
7 Basic requirements for pressure relief devices
8 Minimum flow capacity for safety and rated capacity of pressure relief devices
9 Requirements for determining the operating pressure and operating temperature of pressure relief device
10 Marking, installation and maintenance of pressure relief device
Annex A (Informative) Compression coefficient of gases
Bibliography
GB/T 33215-2025 Pressure relief devices for gas cylinders English, Anglais, Englisch, Inglés, えいご
Pressure relief devices for gas cylinders
1 Scope
This document specifies the types, structural types, setting requirements, selection requirements, basic requirements, calculation of minimum flow capacity for safety and rated capacity, determination requirements of operating pressure or operating temperature, as well as marking, installation and maintenance of pressure relief devices for gas cylinders.
This document is applicable to gas cylinders of various structural types and those containing various gases.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (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
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 13005 and the following apply.
3.1.1
pressure relief device
pressure relief device installed on a gas cylinder to enable rapid automatic venting and pressure relief under unexpected high-temperature conditions, thereby protecting the shell from bursting
Note: It includes pressure relief devices activated by temperature or pressure.
3.1.2
minimum flow capacity for safety
minimum flow required to be relieved to prevent the gas pressure in a cylinder from continuing to rise after reaching the allowable pressure of the cylinder under unexpected high-temperature conditions
3.1.3
rated capacity
mass of gas that can be discharged by a pressure relief device per unit time under set relief conditions
3.1.4
thermally activated pressure relief device; TPRD
pressure relief device activated by temperature
Note: It includes fusible plug device, fusible alloy activated device and glass bulb activated device.
3.1.5
vent area
geometric flow area of the minimum cross section of a pressure relief device used for discharging the medium
3.2 Symbols
For the purposes of this document, the following symbols apply.
A the vent area of the pressure relief device, mm2;
A0 the external surface area of the gas cylinder shell, m2;
C the characteristic coefficient of gas;
K the relief coefficient of the pressure relief device;
k the adiabatic index of the gas;
M the molar mass of the medium contained in the cylinder, kg/kmol;
P the relief pressure (absolute pressure), MPa;
Note: For bursting disc devices, it is the design burst pressure; for TPRD, when the medium in the cylinder is liquefied gas, it is the saturated vapor pressure of the medium at the operating temperature; for safety valves, it is rated relief pressure.
Contents of GB/T 33215-2025
Contents
Foreword i
1 Scope
2 Normative references
3 Terms, definitions and symbols
4 Types and structural types of pressure relief devices
5 Setting requirements of pressure relief devices
6 Selection requirements of pressure relief devices
7 Basic requirements for pressure relief devices
8 Minimum flow capacity for safety and rated capacity of pressure relief devices
9 Requirements for determining the operating pressure and operating temperature of pressure relief device
10 Marking, installation and maintenance of pressure relief device
Annex A (Informative) Compression coefficient of gases
Bibliography
