GB/T 34347-2017 PDF in English
GB/T 34347-2017 (GB/T34347-2017, GBT 34347-2017, GBT34347-2017)
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Periodic inspection and evaluation of cryogenic insulated cylinders
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GB/T 34347-2017: PDF in English (GBT 34347-2017) GB/T 34347-2017
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.020.30
J 74
Periodic inspection and evaluation of cryogenic insulated
cylinders
ISSUED ON. OCTOBER 14, 2017
IMPLEMENTED ON. APRIL 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 Inspection agencies... 5
4 Inspection of welded insulated gas cylinders... 5
5 Inspection of gas cylinder for automobile... 10
6 Other work... 13
Appendix A (Informative) Daily inspection record of cryogenic insulated cylinders 14
Appendix B (Informative) Method for measuring the depression size of the shell of
cryogenic insulated cylinders... 15
Appendix C (Informative) Periodic inspection report of welded insulated cylinder.. 17
Appendix D (Informative) Periodic inspection report of LNG cylinders for automobiles
... 21
Periodic inspection and evaluation of cryogenic insulated
cylinders
1 Scope
This standard specifies the basic methods and technical requirements, for periodic
inspection and evaluation of in-use cryogenic insulated cylinders (including welded
thermal insulation gas cylinders and automotive liquefied natural gas cylinders).
This standard is applicable to the periodic inspection and evaluation of the refillable
welded insulated gas cylinders -- which are used under normal ambient temperature (-
40 °C ~ 60 °C), whose medium is liquid oxygen, liquid nitrogen, liquid argon, liquid
carbon dioxide, liquid nitrous oxide, liquefied natural gas and other cryogenic liquids,
whose design temperature is not higher than -196 °C, whose nominal working pressure
is 0.2 MPa ~ 3.5 MPa. This standard is also applicable to the periodic inspection and
evaluation of the refillable welded insulated gas cylinders for automobile use -- which
is used at normal ambient temperature (-40 °C ~ 60 °C), whose medium is liquefied
natural gas, which is used as an automobile fuel tank, whose design temperature is not
higher than -196 °C, whose nominal working pressure is 0.6 MPa ~ 3.5 MPa.
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/T 3864 Industrial nitrogen
GB/T 12135 Technological specification for inspection agency of gas cylinders
GB/T 12137 Methods for leakage test of gas cylinders
GB/T 16918 Bursting disc safety devices for gas cylinders
GB/T 18443.5 Testing method of performance for vacuum insulation cryogenic
equipment - Part 5.Static evaporation rate measurement
JB/T 6896 Surface clearness of air separation plant
TSG R0006-2014 Supervision regulation on safety technology for gas cylinder
4.3.1 Review of technical archives
4.3.1.1 During the first inspection, review the exit-factory documents of gas cylinders
(including product qualification certificates, quality certificates, gas cylinder
manufacturing supervision and inspection certificates, etc.), operating instructions, etc.
4.3.1.2 If it is not the first inspection, review the previous inspection reports and the
daily inspection records in the latest inspection cycle (refer to Appendix A, for the daily
inspection records).
4.3.1.3 For the repaired gas cylinders, it shall also review the certification documents
for the qualified repair of the gas cylinders.
4.3.2 Record
4.3.2.1 Check and record the manufacturing marks and inspection marks, on the
nameplate of the gas cylinders one by one. The records include the country of
manufacture, the cylinder manufacturing license number, the name of the manufacturer,
the cylinder number, the product standard number, the standard name, the year and
month of manufacture, the nominal working pressure, the test pressure of the liner, the
medium contained, the nominal volume, the maximum filling volume, the net weight
of gas cylinder, the date of last inspection.
4.3.2.2 For the gas cylinders, which are produced by the manufacturing enterprises, that
have not obtained the special equipment manufacturing license, the gas cylinders whose
manufacturing marks are ambiguous or the items are incomplete and undocumented,
the gas cylinders which are not allowed to be reused as stipulated by the special
equipment safety supervision and management authority, they shall be registered and
invalidated.
4.3.2.3 When the gas cylinder has the following problems, it shall be sent to the original
manufacturer OR the organization as entrusted by the original manufacturer, for
disposal.
a) The medium on the nameplate of the gas cylinder is not unique;
b) The thread direction of the gas outlet of the cylinder valve, which is installed on
the gas cylinder, does not meet the requirements;
c) For gas cylinders containing liquid oxygen, liquid nitrous oxide, liquefied natural
gas, the head on the shell has neither pressed the prominently raised medium
symbols, such as "O2", "N2O", "LNG", nor pasted the medium label in the
obvious position.
4.3.3 Disposal of in-cylinder medium
4.3.3.1 Appropriate methods shall be taken, to discharge the medium in the cylinder and
properly handle it, under the conditions of ensuring safety, hygiene, non-polluting the
environment.
4.3.3.2 For gas cylinders with unknown medium, valves that cannot be opened, safety
accessories that fail, they shall be stored separately and properly disposed of.
4.3.4 Surface cleaning and accessory removal
4.3.4.1 Use an appropriate method, that does not damage the metal of the cylinder, to
remove the dirt, contamination and other debris on the surface of the gas cylinder, that
hinder the surface inspection.
4.3.4.2 After confirming that the medium in the cylinder is empty, remove the safety
valve, pressure gauge, liquid level gauge and other detachable accessories; the metal of
the cylinder body shall not be damaged, during the removal process.
4.4 External inspection
Visual inspection or use a magnifying glass of 5X ~ 10X, to inspect the cylinders one
by one. It shall be judged as unqualified, if the following defects are found.
a) There are defects, such as cracks, that affect the performance of the welded joints;
b) The shell of the gas cylinder has serious deformation, mechanical damage, etc.,
which may affect the thermal insulation performance of the interspace; the depth
of the shell depression is greater than or equal to 12 mm, AND the depression
length is greater than or equal to 13% of the circumference of the shell (see
Appendix B for the measurement method of the shell depression size);
c) The protective ring of the gas cylinder, the support of the protective ring, the
distribution head are deformed, cracked or have other mechanical damage and
lose their function;
d) The base of the gas cylinder is deformed, the components are damaged, there is
abnormal inclinations after the base is connected to the cylinder body;
e) There are abnormal phenomena, such as frosting and dew condensation, after the
outer shell of the gas cylinder reaches the thermal equilibrium state when it is
filled with low-temperature liquid (check it during the static evaporation rate test).
4.5 Inspection of safety accessories, valve, pipeline
4.5.1 Inspection of safety accessories
4.5.1.1 The safety accessories of the gas cylinder include. pressure gauge, safety valve,
bursting disc, level gauge. Safety accessories shall meet the relevant requirements of
TSG RF001, TSG ZF003, GB/T 16918, national standards or industry standards. It shall
select the products produced by manufacturing enterprises, that have obtained
b) For gas cylinders containing liquid oxygen and nitrous oxide, the pressure gauge
does not use an oil-free pressure gauge;
c) The casing of the pressure gauge is damaged, the dial glass is broken, the scale
indication value is unclear, the pointer is twisted and broken, the pointer does not
return to zero after pressure relief, the lead seal is damaged;
d) There are cracks or crack defects, in the thread of the pressure gauge and its
connection to the gas cylinder.
4.5.2 Valve and pipeline inspection
4.5.2.1 Visually inspect OR check the cylinder valves one by one by a magnifying glass
of 5X ~ 10X. It shall be judged as unqualified, if finding the following defects.
a) The valve body is seriously deformed;
b) There are cracks or cracking defects in the valve threads.
4.5.2.2 When the globe valve is leaking AND has other abnormal conditions, it is
allowed to replace the valve core assembly, which is provided by the original valve
manufacturer. When the pressure regulating valve has other abnormal conditions, such
as leaking or unstable pressure, it is allowed to replace the diaphragm assembly, which
is provided by the original valve manufacturer.
4.5.2.3 Visually inspect OR use a magnifying glass of 5X ~ 10X, to inspect the pipelines
within the scope of gas cylinders. If the gas cylinders have defects, such as cracks and
damages in pipelines, pipeline joints, welds, etc., it shall be judged as unqualified.
4.5.3 Assembly of safety accessories and valves
4.5.3.1 After all the accessories, which are removed from the cylinder body, are
inspected and qualified, the surface shall be treated accordingly, according to the special
requirements of the medium contained; the assembly shall be carried out, according to
the requirements of the instruction manual. The seals used in the assembly shall not
have chemical reaction with the contained medium.
4.5.3.2 Use a safe light source, to check whether there are foreign objects, such as the
liquid level gauge fixing ring, inside the vertical gas cylinder. If there are foreign objects,
they shall be taken out. If there are pollutants in the gas cylinder, they shall be properly
disposed of. For gas cylinders, which contain liquid oxygen and liquid nitrous oxide,
check whether the cylinder inside is contaminated with grease. If any grease
contamination is found, degrease shall be carried out. The disassembly and assembly
interfaces of safety accessories and valves shall be degreased and de-oiled. It shall be
ensured that the gas cylinder is not polluted by grease AND meets the relevant
provisions of JB/T 6896 during the inspection. When using white, clean, dry filter paper
to wipe the degreasing surface, there shall be no grease and dirt on the paper. It can be
c) The gas cylinder is burnt by an open flame.
5.2 Inspection items
The inspection items of gas cylinders include external inspection, safety accessories
inspection, valve and pipeline inspection (limited to the pipeline system within the gas
cylinder product range), fixture inspection, air tightness test, static evaporation rate
detection.
5.3 Preparation for inspection
5.3.1 See 4.3.1 for the review content of technical archives; see 4.3.2 for the record
content. It shall also record the license plate number of the vehicle, where the gas
cylinder is located.
5.3.2 See 4.3.3.1 and 4.3.4 for the treatment of the medium in the cylinder, the cleaning
of the surface of the cylinder, the disassembly of accessories.
5.4 External inspection
Carry out visual inspection OR use a magnifying glass of 5X ~ 10X to inspect the outer
surface of the gas cylinders one by one. It shall be judged as unqualified, if there are
following defects.
a) Cylinders whose nameplates are not fixed by welding;
b) Cylinders without protective rings;
c) There are situations a), b), c), e) in 4.4.
5.5 Inspection of safety accessories, valves, piping (limited to piping systems within
the scope of gas cylinder products)
5.5.1 Inspection of safety accessories
5.5.1.1 The safety accessories of the gas cylinder include. pressure gauge and safety
valve. Safety accessories shall meet the relevant requirements of TSG RF001, national
standards or industry standards. It shall select the products, which are produced by
manufacturing enterprises that have obtained corresponding manufacturing licenses,
according to regulations. Their models, specifications, technical parameters shall be
definite and clear.
5.5.1.2 The safety accessories of gas cylinders shall be regularly calibrated or verified,
in accordance with relevant provisions. See 4.5.1.3 and 4.5.1.6, for inspection of safety
valves and pressure gauges.
5.5.2 Valve and piping inspection (limited to piping systems within the scope of gas
cylinder products)
See 4.5.2 for valve and piping inspection.
5.5.3 Assembly of safety accessories and valves
All accessories, which are removed from the cylinder, shall be assembled, according to
the requirements of the instruction manual, after passing the inspection, respectively.
The seals, which are used during assembly, must not react chemically with LNG.
5.6 Fixture inspection
For the inspection of fixtures, it shall be judged as unqualified, if the following defects
are found.
a) There are defects, such as cracking, deformation, damage in the welding seam of
the gas cylinder's saddle or bracket;
b) The fixing bolts of the gas cylinder's straps are loose;
c) The fixing bolts of the gas cylinder's saddle or bracket are loose;
d) The rubber gasket of the gas cylinder's saddle is falling off, aged, broken.
5.7 Air tightness test
5.7.1 The assembled gas cylinders shall be tested for air tightness one by one.
5.7.2 The test medium shall be nitrogen or natural gas, which complies with GB/T 3864.
Test methods and safety measures shall comply with the provisions of GB/T 12137.
5.7.3 The test pressure shall be the nominal working pressure of the gas cylinder. The
pressure shall be maintained for 1 minute. Use a grease-free inspection fluid, to check
the safety accessories, pipelines, valves, sealing surfaces. If there is no leakage, it is
qualified.
5.7.4 If there is leakage, due to improper assembly of accessories and valves, the vehicle
gas cylinder shall be tested, after reassembly.
5.8 Detection of static evaporation rate
Gas cylinders shall be tested for static evaporation rate one by one. The detection
method shall be the gas mass flow meter method or the weighing method. The test
method shall refer to the requirements of GB/T 18443.5.The test medium can be liquid
nitrogen or liquefied natural gas. The static evaporation rate value of the gas cylinder
shall meet the requirements in Table 2; otherwise, it will be judged as unqualified. If
other testing methods are used, to test the low temperature thermal insulation
performance of gas cylinders, it shall be carried out, in accordance with the provisions
of 1.6 in TSG R0006-2014.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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