GB/T 34510-2017 PDF English
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GB/T 34510-2017: Liquefied natural gas cylinders for vehicles---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT34510-2017
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
Foreword
This document 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 shall not be held responsible for
identifying any or all such patent rights.
This document was proposed by and shall be under the jurisdiction of National
Technical Committee on Gas Cylinders of Standardization Administration of China
(SAC/TC 31).
The drafting organizations of this document. Chart Cryogenic Engineering System
(Changzhou) Co., Ltd., Beijing Tianhai Industry Co., Ltd., Zhangjiagang Furui Special
Equipment Co., Ltd., Zhangjiagang CIMC Shengdai Cryogenic Equipment Co., Ltd.,
Dalian Boiler and Pressure Vessel Inspection Institute, China Special Equipment
Testing and Research Institute, Sichuan Air Separation Equipment (Group) Co., Ltd.
Main drafters of this document. Xu Huixin, Li Zhaoting, Zhang Baoguo, Gu Haibo, Yi
Xilang, Pan Huajun, Yin Jinsong, Cai Hao, Huang Qianghua, Han Bing, Wang Yanhui,
Chen Zuzhi, Wang Lian, Yao Xin, Zheng Renzhong, Liu Shouzheng.
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
GB/T 17925, Standard practice for X-ray digital radioscopic examination of
cylinder weld
3 Terms and definitions, symbols
3.1 Terms and definitions
The terms and definitions defined in GB/T 13005 and the following apply to this
document.
3.1.1 batch
It includes batch of inner containment vessels and batch of cylinders.
3.1.2 inner containment vessel
The inner layer pressure-bearing element for filling LNG medium.
3.1.3 outer shell
The outer casing that forms and protects the insulating space of the gas cylinder.
3.1.4 static evaporation rate
The static evaporation rate refers to the percentage of the mass of the cryogenic liquid
lost by natural evaporation within 24h and the mass of the cryogenic liquid under the
effective volume of the cylinder, converted to the evaporation rate value under the
standard environment (20℃, 1atm), after the gas cylinder is left to stand for 48h after
filling to the maximum allowable volume of cryogenic liquid.
3.1.5 net weight
The actual weight of the cylinder and its non-removable connections (including piping).
3.1.6 effective volume
The maximum liquid volume allowed by the inner containment vessel.
3.1.7 vacuum interspace leak rate
The amount of gas leaking into the vacuum interlayer per unit time.
3.2 Symbols
The following symbols apply to this document.
4 Types and basic parameters
4.1 Type and product model
4.1.1 The structure of the gas cylinder is horizontal, as shown in Figure 1.
4.1.2 The product model of the gas cylinder is named according to GB/T 15384.The
representation method is as follows.
4.2 Basic parameters
4.2.1 The nominal volume V and the recommended nominal diameter DN of the gas
Modification serial number, represented by Roman
4.2.2 The static evaporation rate of the gas cylinder with a nominal working pressure
of 1.0MPa~1.6MPa is as specified in Table 2.The static evaporation rate of other
cylinders with nominal working pressure shall be specified according to the design
drawings.
5 Materials
5.1 General provisions for materials
5.1.1 The material of the gas cylinder inner containment vessel shall be austenitic
stainless steel. It shall also meet the requirements of GB/T 24511 and other material
standards. The chemical composition and mechanical properties shall not be lower than
those specified in Table 3 and Table 4.If foreign designation materials are used, they
shall comply with the provisions of 2.2 in TSG R0006-2014.
5.1.5 The inner containment vessel body and head material shall be subjected to the
reinspection of chemical composition according to the furnace tank number and
reinspection of mechanical properties according to the batch number. Materials that
have passed the reinspection shall be marked with a chlorine-free and sulfur-free marker.
5.1.6 The outer shell material shall be austenitic stainless steel.
5.2 Chemical composition
The chemical composition and allowable deviation of the main material of the inner
containment vessel are as specified in Table 3.
5.3 Mechanical properties
The mechanical properties of the main material of the inner containment vessel are
Chemical composition
6 Design
6.1 General provisions
6.1.1 The gas cylinder is composed of an inner containment vessel, an outer shell, a
thermal insulation layer and a valve piping system in the interlayer.
6.2 Inner containment vessel
6.3 Outer shell
6.3.1 General requirements
The design of the wall thickness of the outer shell cylinder body and head shall meet
the requirement that the allowable external pressure is not less than 0.21MPa.
6.3.2 Wall thickness of outer shell cylinder body
The wall thickness of the outer shell cylinder body is verified according to formula (2).
6.4 Welded joint
6.4.1 Longitudinal and annular welded joints shall be of full penetration butt type.
6.5 Piping system
6.5.1 General requirements
The piping system shall be set up with basic functions such as liquid filling, liquid outlet,
automatic and manual pressure relief, overspeed discharge flow restriction, pressure
display and liquid level display. The valve of the piping system shall be marked with
the flow direction of the medium. Stop valves shall be marked with opening and closing
directions.
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.
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.
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.
6.7 Automatic safe-space insurance function
The gas cylinder shall have the function of automatic charging limit. When refilling
with any residual amount of LNG in the cylinder, ensure that the actual safety space in
the cylinder is consistent with the design value. See Annex D for the test method of the
automatic safe-space insurance function.
6.8 Hold time
The hold time of the cylinder shall not be less than 5 days.
7 Manufacturing
7.1 Batching
Gas cylinders are manufactured in batches of inner containment vessel. That is, a
cylinder product batch generally contains only the inner containment vessels of the
same batch. However, one inner containment vessel batch is allowed to be divided into
several cylinder product batches.
7.2 Welding procedure qualification
on welded test panels. The welding procedure qualification of the circumferential
welded joint shall be carried out on the simulated cylindrical test piece, or it can be
carried out directly on the inner containment vessel cylinder body.
7.3 Cylinder body
7.3.1 When the cylinder body is welded by steel plate, the rolling direction of the steel
plate shall be consistent with the circumferential direction of the cylinder body.
7.3.2 The difference e between the maximum and minimum diameters of the same cross
section of the cylinder body is not greater than 0.01Di.
7.3.3 The amount of misalignment b of the longitudinal welded joint of the cylinder
body shall not be greater than 0.1Sn, see Figure 2.
7.4 Head
7.4.1 The head steel plate is not allowed to be spliced.
7.4.2 The minimum thickness of the inner containment vessel head shall not be less
7.7 General provisions for inner containment vessel welding
7.7.1 The welding work for eligible items of gas cylinders within the validity period
shall be carried out by the person who passes the examination and obtains the "Special
equipment operator certificate" for the corresponding project in accordance with the
relevant safety technical specifications. After welding, the welded joints shall have
traceable identification and records.
7.8 Appearance of welded joints
7.8.1 The excess height of the inner containment vessel butt welded joint is
0mm~2.5mm. The difference between the widest and narrowest parts of the same
welded joint is not more than 3mm.
7.9 Nondestructive testing
7.9.1 After passing the visual inspection, the longitudinal and annular welded joints of
the inner containment vessel shall be subjected to nondestructive testing one by one.
Personnel engaged in nondestructive testing of gas cylinders shall hold a valid
qualification certificate for nondestructive testing of special equipment.
7.10 Solder joint repair
7.10.3 The number of repairs and the repaired parts shall be recorded in the production
inspection record of the product.
7.11 Surface quality and cleanliness
8 Test methods
8.1 Material reinspection
For the reinspection of the chemical composition and mechanical properties of the
stainless-steel material of the gas cylinder, sampling, analysis and testing shall be
carried out according to the method specified in the material standard.
8.2 Mechanical properties test for welding procedure evaluation test plate
8.4 Mechanical properties test of welded joints
8.4.1 Take welded joint specimens from the inner containment vessel. Respectively take
1 tensile force specimen, 1 transverse face bend specimen and 1 back bend specimen,
3 low temperature impact specimens (notch is located in the center of the welded joint)
from longitudinal and circumferential welded joints. The intercepted parts of the test
plate and the sample blank are shown in Figure 7.
8.5 Pressure test of inner containment vessel
8.5.1 When the hydraulic test is used, it shall be carried out in accordance with the
provisions of GB/T 9251.
8.7 Determination of weight and volume
8.7.1 Use weighing method to determine the net weight of the gas cylinder. The unit of
weight is kilograms (kg).
8.7.2 Weighing shall use a weighing instrument with a maximum weight of 1.5 to 3.0
times the actual weight. Its accuracy shall meet the requirements of minimum weighing
error.
8.8 Determination of wall thickness
Use an ultrasonic thickness gauge to measure the wall thickness.
8.9 Visual inspection
8.9.1 Visually inspect the surface of the inner containment vessel and outer shell,
appearance of welded joints, and safety accessories.
8.9.2 Wipe the degreased surface with a white, clean, dry filter paper. The paper shall
be free of traces of grease and dirt. The surface in contact with the medium shall be
checked according to the requirements of JB/T 6896.
The test method for leak and outgassing rate shall be carried out according to the
provisions of GB/T 18443.4.
8.14 Static evaporation rate test
The test of static evaporation rate shall be carried out according to the provisions of
GB/T 18443.5.
8.15 Hold time test
The hold time shall be carried out in accordance with the provisions of GB/T 18443.7.
9 Inspection rules
9.1 Material inspection
9.1.1 The gas cylinder manufacturer shall conduct chemical composition verification
analysis on the material of inner containment vessel according to the method specified
in 8.1 and the furnace tank number. Conduct the mechanical properties verification test
according to the batch number.
9.2 Exit-factory inspection
9.2.1 Inspection one by one
The one-by-one gas cylinder inspection shall be carried out according to the items
specified in Table 8.
9.2.2 Batch inspection
9.2.2.1 Batching and sampling rules
9.3 Type test
9.3.1 Before the first batch of newly designed gas cylinders is put into production or
the first batch of gas cylinders put into production after more than six months of
production suspension, the type test shall be carried out in accordance with the
requirements of 9.3.2.
9.3.2 Submit the same specifications of gas cylinders and inner containment vessels
that meet the quantity requirements. Carry out the type test according to the items
specified in Table 8.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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