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

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

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GB/T 34510-2017: Liquefied natural gas cylinders for vehicles

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.
GB/T 34510-2017
NATIONAL STANDARD OF THE
PEOPLE 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 saturated vapor pressure and opening pressure of the safety valve shall be indicated in the design drawings and technical documents provided to the user. 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
7.2.1 Welding procedure qualification shall be carried out separately for longitudinal or circumferential welded joints. When the wall thickness of the material is less than 6mm, each wall thickness needs to be evaluated. When the wall thickness is the same, the evaluation results of small-diameter gas cylinders can be substituted for large-diameter gas cylinders. When the cylinder manufacturer changes the inner containment vessel material, welding material, welding process and welding equipment, welding procedure qualification shall be carried out before production. In addition to the requirements of this Standard, the welding procedure qualification shall comply with the requirements of GB/T 33209.
7.2.2 Welding procedure qualification for longitudinal welded joints can be carried out 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. The welded joints for procedure qualification shall be able to represent the main welded joints (longitudinal, annular and corner welded joints) of the inner containment vessel. 7.2.3 The test piece for welding procedure qualification shall be free from defects such as undercuts, cracks, surface pores, welding slag, pits, welding flashes. The welded joints of the test plate are tested by 100% radiography. The testing results shall meet the requirements for level II of NB/T 47013.2.
7.2.4 The number of welded joint specimens for welding procedure qualification is specified as follows: 2 tensile test specimens, 4 transverse bending specimens (2 pieces each for face bending and back bending), 6 low temperature impact specimens (3 for welded joints and 3 for heat affected zones) at the lowest operating temperature of the inner containment vessel material.
7.2.5 When the measured thickness of the inner containment vessel material for welding procedure qualification is not enough to prepare a low temperature impact specimen with a thickness of 2.5mm, specimens with a thickness of 2.5mm shall be prepared from welded test panels not exceeding 3.2mm in thickness as specified in 5.1, 5.2 and 5.3 of this Standard. The carbon content of the test plate material shall not be less than 0.05%. metal.
7.8.3 Welded joints and heat-affected zone surfaces on gas cylinders are not allowed to have defects such as undercut, incomplete penetration, cracks, pores, depressions and irregular sudden changes. Spatter on both sides of the welded joint shall be removed. 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. 7.9.2 Carry out 100% radiographic testing for the longitudinal and ring welded joints of inner containment vessel. Welded joint defect level evaluation shall be carried out according to NB/T 47013.2. The defect level is not lower than level II. The radiographic inspection technology level is not lower than level AB. For the part that can perform radiographic testing, ultrasonic testing can be used instead.
7.9.3 Digital imaging method can be used for nondestructive testing. When it is used, it shall meet the requirements of GB/T 17925.
7.10 Solder joint repair
7.10.1 Weld joint repair shall be carried out according to the repair process. It shall be performed by a person with the qualifications specified in 7.7.1. The repaired parts shall be subject to appearance testing and nondestructive testing according to 7.8 and 7.9. 7.10.2 The number of repairs on the same part of the welded joint of inner containment vessel shall not exceed two times. If it exceeds, it shall be approved by the technical chief of the manufacturer before repairing.
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
7.11.1 The inner and outer surfaces of the inner containment vessel and the outer shell shall be smooth. There shall be no cracks, heavy skin, scratches and other defects, otherwise it shall be repaired. The grinding shall be smooth and clean. The wall thickness of the inner containment vessel shall meet the requirements of 6.2. The wall thickness of the outer shell shall meet the requirements of 6.3.
7.11.2 The inner and outer surfaces of the inner containment vessel and all parts in contact with the medium shall be degreased, in line with the relevant regulations of JB/T 6896 and have good protection measures.
7.11.3 All surfaces and parts under vacuum shall be clean and dry. There must be no oil and dust.
7.12 Volume and weight
7.12.1 The measured water volume of the gas cylinder liner shall not be less than its nominal volume. The measured volume can be replaced by theoretical calculation, but there shall be no negative deviation.
7.12.2 After the cylinders are manufactured, the net weight shall be measured one by one.
7.13 Pressure test
7.13.1 The inner containment vessel of the gas cylinder shall be subjected to a pressure test one by one after passing the radiographic test. The pressure test uses water pressure or air pressure test. The test pressure shall be as specified in 4.2.4. The hydrostatic test medium is clean water. The chloride ion content shall not exceed 25mg/L. The air pressure test shall use dry oil-free air or nitrogen.
7.13.2 Safety precautions shall be taken in the air pressure test.
7.13.3 The holding pressure shall not be less than 30s under the test pressure. The inner containment vessel must not have macroscopic deformation, leakage and abnormal sound. The pressure gauge range is 2.0 to 3.0 times the test pressure. The accuracy is not less than level 1.6.
7.13.4 After the hydraulic test, the water in the inner containment vessel and the connecting pipe shall be drained in time. Make them dry.
7.13.5 If a leak is found in the welded joint during the pressure test, it shall be repaired as specified in 7.10. After the repair is accepted, the pressure test shall be carried out again as required.
7.14 Mechanical properties test of welded joint of inner containment vessel 7.14.1 Each batch of inner containment vessels shall be tested for mechanical properties of welded joints. It can take samples from the inner containment vessel or product welding test plate. When the specimens are taken from the welded test plate, only the mechanical properties test of the longitudinal welded joint is carried out. 7.14.2 The welding test plate of the product shall be loaded and unloaded on the same steel plate (or the same batch of steel plates) with the test inner containment vessel. As an extension of the longitudinal welded joint of the test inner containment vessel, it is welded together with the longitudinal seam. The test plate shall be marked with the code of the test inner containment vessel and welder. Welded joints on test plates shall be subject to external inspection and 100% radiographic inspection, in accordance with the provisions in 7.8 and 7.9. The size of the welded test plate and the sampling location of the mechanical property specimen are as shown in Figure 6.
7.15.1 The selection of thermal insulation materials and adsorption materials shall comply with the provisions of 5.1.7 and drawings.
7.15.2 The insulation layer shall be tightly wrapped. Collapse shall not occur. 7.16 Vacuum leak detection
7.16.1 The cylinders shall be vacuum leak-tested one by one. The leak rate shall meet the requirements of 4.2.3.
7.16.2 If a leak is found in the welded joint during the vacuum leak test, it may be repaired in accordance with the provisions of 7.10. After the repair is accepted, carry out the pressure test again according to the requirements of 7.13. After passing the test, conduct a vacuum leak test as required.
7.17 Vacuum
After the gas cylinder is filled with liquid nitrogen, the vacuum degree of the interlayer shall not be lower than 2??10-2Pa.
7.18 Pipeline air tightness test
After the valve and safety accessories of the gas cylinder are assembled, the air tightness test of the pipeline shall be carried out with dry and oil-free clean air or nitrogen. The test pressure is the nominal working pressure. The hold time is not less than 1min. Valves, joints and safety accessories must not leak.
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 8.2.1 According to the requirements of 7.2.2, when cutting the blank from the welding procedure qualification test plate (refer to Figure 6 for dimensions), the part discarded from the two ends of the test plate is not less than 50mm. The sample blank is generally cut by machining method. When thermal cutting is used, the heat affected zone shall be removed. When cutting the sample blank from the inner containment vessel by thermal cutting (refer to Figure 7 for the cutting position), no heat-affected zone shall be left on the specimen.
8.2.2 The number of welded joint specimens for welding procedure qualification shall be as specified in 7.2.4.
as possible. The low temperature impact test method is carried out according to GB/T 229. The cooling temperature of the specimen is -196???. The time from the time the specimen is taken out to the completion of the impact test shall not be greater than 5s.
8.3 Nondestructive testing of welded joints
The radiographic inspection of the longitudinal and annular welded joints of the inner containment vessel is carried out in accordance with NB/T 47013.2. It may use digital imaging methods for X-ray inspection. When it is used, it shall meet the requirements of GB/T 17925. Carry out the ultrasonic testing in accordance with NB/T 47013.3. 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.
8.4.2 Take welded joint specimens from the product welding test plate: 1 tensile test specimen, 1 transverse face bend specimen and 1 back bend specimen, 3 impact specimens (the notch is located in the center of the welded joint). The intercepted part of the sample blank is shown in Figure 6.
8.4.3 The method of cutting the sample blank from the inner containment vessel of the gas cylinder or the welding test plate of the product shall comply with the provisions of 8.2.1.
8.4.4 The fabr...

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