GB/T 34510-2017 English PDF (GBT34510-2017)

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GB/T 34510-2017: Liquefied natural gas cylinders for vehicles
GB/T 34510-2017
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.020.30
J 74
Liquefied natural gas cylinders for vehicles
ISSUED ON: OCTOBER 14, 2017
IMPLEMENTED ON: MAY 01, 2018
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 and definitions, symbols ... 6 
4 Types and basic parameters ... 10 
5 Materials ... 11 
6 Design ... 13 
7 Manufacturing ... 18 
8 Test methods ... 26 
9 Inspection rules ... 30 
10 Marks, packaging, transportation, storage ... 34 
11 Product certificate, product instruction manual and batch inspection quality
certificate ... 36 
12 Terms of use ... 37 
Annex A (normative) Safety performance test ... 38 
Annex B (normative) Calculation of safe discharge capacity of gas cylinder and
discharge capacity of safety valve ... 44 
Annex C (informative) Design calculation of safe space ... 47 
Annex D (normative) Test method for automatic safe-space insurance function ... 48 
Annex E (informative) Product certification ... 50 
Annex F (informative) Batch inspection quality certificate ... 52 
Bibliography... 54 
Liquefied natural gas cylinders for vehicles
1 Scope
This Standard specifies the terms and definitions, symbols, types, basic parameters,
materials, design, manufacture, test methods, inspection rules, marks, packaging,
transportation, storage, product qualification certificates, product instruction manuals,
batch inspection quality certificates and usage regulations for liquefied natural gas
(LNG) cylinders for vehicles (hereinafter referred to as the cylinders).
This Standard is applicable to the insulated cylinders that are used under normal
ambient temperature (-40℃~60℃), that the storage medium is LNG, the design
temperature is not higher than -196℃, the nominal volume is 150L~500L, and the
nominal working pressure is 0.8MPa~3.5MPa, that are used for refillable welding for
automotive fuel tanks.
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 228.1, Metallic materials - Tensile testing - Part 1: Method of test at room
temperature
GB/T 229, Metallic materials - Charpy pendulum impact test method
GB/T 1804, General tolerances - Tolerances for linear and angular dimensions
without individual tolerance indications
GB/T 2653, Bend test methods on welded joints
GB/T 7144, Coloured cylinder mark for gases
GB/T 9251, Methods for hydrostatic test of gas cylinders
GB/T 12137, Methods for leakage test of gas cylinders
GB/T 13005, Terminology of gas cylinders
GB/T 13550, Molecular sieve 5A and its determination
GB/T 15384, Designation for gas cylinders
device shall not affect the maintenance or replacement of valves, piping and vacuuming
connections.
6.5.4 Liquid-filling pipeline
A dedicated liquid-filling joint shall be provided on the liquid-filling pipeline. The
liquid-filling joint shall have a non-return function for the medium in the gas cylinder
to flow to the outside. It shall have a dust cover. If no special liquid-filling joint is
provided, a stop valve, a threaded plug, or a flange and other sealing structure shall be
provided. Ensure that the medium does not leak after filling and during use.
6.5.5 Liquid outlet pipeline
The liquid outlet pipeline and the joints on the pipeline, the diameter of the valve, the
installation position and the installation method shall be able to meet the requirements
of the discharge capacity.
The liquid outlet pipeline shall be provided with stop valve and excess-flow unit.
The excess-flow unit is installed between the liquid side end of the liquid outlet pipeline
and the front end of the vaporizer. It can automatically cut off the pipeline in the event
of a large amount of leakage, rupture, or rupture of the fuel supply pipeline at the rear.
For structural gas cylinders equipped with an external vaporization supercharger, a
check valve (or check valve) shall be installed at the joint of the gas cylinder return pipe.
Prevent the gas in the cylinder from leaking out.
6.5.6 Pressure relief pipe
The pressure relief pipeline shall be in direct communication with the gas phase space
of the gas cylinder inner containment vessel. The diameter of the pipeline shall meet
the requirements for safe discharge.
The pressure relief pipeline is divided into automatic pressure relief (the safety valve is
opened to release pressure) and manual pressure relief.
When the gas cylinder is installed on the vehicle, the outlet of the pressure relief
pipeline shall be connected to a safe location for discharge. When the vehicle is parked,
the pressure relief pipe shall also meet the requirements of 10.8c).
If it is necessary to release the pressure during filling, it is strictly forbidden to directly
discharge it to the atmosphere. It can be discharged into the LNG storage container of
the filling station.
6.5.7 Safety valve
The inner containment vessel shall be provided with at least two safety valves. The inlet
pipes of the safety valve shall be directly connected to the gas-phase space of the inner
containment vessel. The discharge capacity of each safety valve shall be able to
independently meet the requirements for safe discharge. Safety valve can be installed
in any orientation. However, a stop valve shall not be installed before the safety valve.
The outlet of the main safety valve of the gas cylinder shall meet the requirements of
6.5.5.
The gas cylinders shall not be fitted with bursting discs.
See Annex B for the calculation of the safety relief volume and the discharge capacity
of the safety valve. The opening pressure of the main safety valve is not more than 1.2
times the nominal working pressure. The opening pressure of the auxiliary safety valve
is not more than 1.8 times the nominal working pressure.
6.5.8 Pressure gauge
The pressure gauge range is 1.5 times to 3.0 times the nominal working pressure. The
precision is not less than level 2.5. The inlet pipeline of the pressure gauge shall be
directly connected with the gas phase space of the inner containment vessel.
6.5.9 Level gauge
Each gas cylinder shall be provided with a liquid level gauge capable of transmitting
the liquid level signal to the cab of the vehicle. It has a warning function when the
remaining fuel in the cylinder is 5% of the maximum filling amount.
6.6 Safety space
There shall be enough safety space in the cylinder. When filling LNG with a saturated
vapor pressure of 0.8MPa (gauge pressure, the same below), and the opening pressure
of the safety valve is 1.6MPa, the safety space shall be at least 10% of the total volume
of the inner containment vessel. When the saturated steam is filled with other pressures,
or the safety valve adopts LNG cylinders with other opening pressures, then the volume
of the safety space shall be calculated according to the density difference of LNG under
the filling pressure and the opening pressure of the safety valve. See Annex C for the
calculation method of the safety space. The safety space of the gas cylinder and the
corresponding satu...