GB/T 34539-2017 English PDF (GBT34539-2017)

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GB/T 34539-2017: Safety requirements on hydrogen-oxygen generator
GB/T 34539-2017
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 27.180
F 19
Safety requirements on hydrogen-oxygen generator
ISSUED ON: OCTOBER 14, 2017
IMPLEMENTED ON: MAY 01, 2018
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions... 5 
4 Basic requirements ... 6 
5 Environmental safety requirements for hydrogen-oxygen generator ... 7 
6 Safety requirements for gas supply system ... 9 
7 Electrical installations ... 11 
8 Safety guards ... 12 
9 Test run, operation, maintenance ... 13 
10 Emergency treatment ... 15 
Appendix A (Informative) Wet flame arrester ... 17 
Safety requirements on hydrogen-oxygen generator
1 Scope
This standard specifies the basic safety requirements for hydrogen-oxygen generators,
the environmental safety requirements for places where hydrogen-oxygen generators
are installed, gas supply systems, electrical devices, safety protection devices, test run,
operation and maintenance, emergency treatment, etc.
This standard is applicable to hydrogen-oxygen generators and their hydrogen-oxygen
mixed-gas gas supply pipelines, which have a working pressure ≤ 0.2 MPa and PV ≤
8.0 MPa·L.
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) is
applicable to this standard.
GB 2894 Safety signs and guideline for the use
GB/T 4830 Industrial process measurement and control instruments - Pressure range
and quality of air supply
GB 4962 Technical safety regulation for gaseous hydrogen use
GB 9448 Safety in welding and cutting
GB/T 19001 Quality management systems - Requirements
GB/T 24499 Technology glossary for gaseous hydrogen, hydrogen energy and
hydrogen energy system
GB/T 29411-2012 Technical specification of hydrogen-oxygen generator with water
electrolyte
GB/T 29729-2013 Essential requirements for the safety of hydrogen systems
GB 50058 Code for design of electrical installations in explosive atmospheres
GB 50177 Design code for hydrogen station
4 Basic requirements
4.1 Risk factors
4.1.1 The hydrogen concentration in the hydrogen-oxygen mixed gas is within its
explosion limit, which is an explosive mixed gas. In a confined space, it is easy to be
ignited or even explode, in case of open flame, high temperature, static electricity, etc.
4.1.2 Hydrogen-oxygen mixed gas may leak, through porous materials, mounting
surfaces or sealing surfaces. The hydrogen-oxygen mixed gas will spread rapidly after
leakage, resulting in the continuous expansion of flammable and explosive areas,
meanwhile the diffusion process is invisible to the naked eye. The main factors, that
affect the leakage and diffusion of hydrogen-oxygen mixed gas, include leakage port
area, leakage pressure, leakage location, ambient temperature, ambient wind speed,
obstacles.
4.1.3 Backfire may occur when the hydrogen-oxygen generator, that uses an open flame
at the end, is used. Backfire may cause the hydrogen-oxygen mixed gas to burn and
explode, in its pipeline AND in the hydrogen-oxygen generator.
4.2 Risk control
4.2.1 When using the hydrogen-oxygen generator, it shall be used immediately after
production; it is forbidden to store and compress the hydrogen-oxygen mixed gas.
4.2.2 Under the premise of meeting the demand, control the usage of hydrogen-oxygen
mixed gas.
4.2.3 The maximum working pressure of the hydrogen-oxygen generator should not be
greater than 0.2 MPa. Under the conditions that meet the requirements of use, the
working pressure of the equipment should be less than 0.1 MPa.
4.2.4 Where the hydrogen-oxygen generator is used, the accumulation of hydrogen-
oxygen mixed gas in a confined space is not allowed.
4.2.5 The hydrogen-oxygen generator and its main pipeline shall be provided with
safety devices, such as overpressure relief devices and flame arresters.
4.2.6 The place, where the hydrogen-oxygen generator is used, shall be equipped with
fire extinguishing equipment, such as carbon dioxide fire extinguisher or dry powder
fire extinguisher.
4.3 Safety level
4.3.1 Hydrogen-oxygen generators shall be classified into safety levels, according to
working pressure and PV, as shown in Table 1.
installed, shall be fortified according to Zone 2, meanwhile it shall comply with the
relevant provisions of GB 50058.
5.1.3 The water pressure of cooling water should be 0.2 MPa ~ 0.4 MPa.
5.1.4 The gas source pressure of the compressed air, for instruments or pneumatics,
shall be determined according to relevant requirements; its quality shall comply with
the provisions of GB/T 4830.
5.2 Installation site of hydrogen-oxygen generator
5.2.1 The setting location of the hydrogen-oxygen generator shall be determined,
according to the gas supply scale and the use characteristics of the hydrogen-oxygen
mixed gas. Hydrogen-oxygen generators, which have a safety level 1 and 2, should be
arranged near the outer wall in the building (workshop).
5.2.2 There shall be no sundries, in the place where the hydrogen-oxygen generator is
installed; the passage shall be kept unobstructed.
5.2.3 The partition wall of the special room for the hydrogen-oxygen generator shall be
a solid wall of non-combustible body; it shall be provided with a fire door, which opens
to the outside. The roof shall be flat; the roof shall be made of lightweight roof, which
shall comply with the relevant provisions of GB 50177.
5.2.4 The place, where the hydrogen-oxygen generator is installed, shall be set up with
natural ventilation and mechanical ventilation. During natural ventilation, the number
of air changes shall not be less than 3 times per hour. The number of air changes for
mechanical ventilation shall not be less than 12 per hour. The air outlet shall be located
at a higher place on the roof or partition wall.
5.2.5 The upper part of the place, where the hydrogen-oxygen generator is installed,
shall be equipped with a hydrogen concentration alarm, which shall be interlocked with
the mechanical exhaust fan.
5.2.6 It is strictly forbidden to use an open flame for heating, in the place where the
hydrogen-oxygen generator is installed.
5.2.7 The floor of the room, where the hydrogen-oxygen generator is installed, shall be
flat, wear-resistant, anti-static. The doors and windows shall be made of materials, that
do not spark when impacted.
5.3 Operating environment requirements
5.3.1 The ambient temperature is 5 °C ~ 40 °C.
5.3.2 The place of use shall be free of gas, steam, chemical deposits, dust and other
explosive and corrosive media, that seriously affect the use of the hydrogen-oxygen
generator; there shall be no severe vibration and turbulence; it shall comply with the
relevant provisions of GB 4962 and GB 9448.
6 Safety requirements for gas supply system
6.1 General requirements
6.1.1 The gas supply system includes hydrogen and oxygen generators, pipes,
accessories.
6.1.2 The hydrogen-oxygen mixed gas shall not be discharged indoors; the discharge
pipe shall be led out of the room AND shall be more than 2.0 m above the roof. A wet
flame arrester shall be installed, on...