GB/T 33145-2023 PDF English
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GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.020.30
CCS J 74
Replacing GB/T 33145-2016
Large Capacity Seamless Steel Gas Cylinders
(ISO 11120.2015, Gas cylinders - Refillable seamless steel tubes of water
capacity between 150 L and 3,000 L - Design, construction and testing, NEQ)
Issued on. MAY 23, 2023
Implemented on. DECEMBER 1, 2023
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative References... 4
3 Terms, Definitions and Symbols... 6
4 Type, Parameters and Model... 9
5 Technical Requirements... 10
6 Test Methods... 18
7 Inspection Rules... 24
8 Marking, Coating, Packaging, Transportation and Storage... 29
9 Product Certificate, Instruction Manual and Batch Inspection Quality Certificate.. 32
Appendix A (Normative) Chemical Composition of Commonly Used Cylinder Body
Materials... 34
Appendix B (Informative) Calculation Method of Shear Stress Safety Factor for
Straight Threads... 35
Appendix C (Normative) Ultrasonic Testing... 36
Appendix D (Normative) Magnetic Particle Testing... 40
Appendix E (Informative) Hardness - Tensile Strength Correspondence Diagram... 43
Bibliography... 45
Foreword
This document was drafted in accordance with the rules provided in GB/T 1.1-2020 Directives
for Standardization - Part 1.Rules for the Structure and Drafting of Standardizing Documents.
This document serves as a replacement GB/T 33145-2016 Large Capacity Seamless Steel Gas
Cylinders. In comparison with GB/T 33145-2016, apart from structural adjustments and
editorial modifications, the main technical changes are as follows.
a) The upper limit of the nominal operating pressure in the Scope of this document is
modified from 30 MPa into 35 MPa. “Steel cylinders with a nominal capacity greater
than 3,000 L, and less than or equal to 4,200 L may take the relevant stipulations of
this document as a reference” is added to the Scope of this document (see Chapter 1;
Chapter 1 of Version 2016);
b) The upper limit of the nominal diameter of steel cylinders is modified (see Table 1;
Table 1 of Version 2016);
c) The nominal bursting pressure of the bursting disc of the safety relief device is
adjusted to 1.5 times the nominal operating pressure p of gas cylinders (see 5.2.5.2;
5.2.5.2 of Version 2016).
This document was drafted with reference to ISO 11120.2015 Gas cylinders - Refillable
seamless steel tubes of water capacity between 150 L and 3,000 L - Design, construction and
testing. The degree of consistency with ISO 11120.2015 is non-equivalent.
Please be noted that certain content of this document may involve patents. The institution
issuing this document does not undertake the responsibility of identifying these patents.
This document was proposed by and shall be under the jurisdiction of National Technical
Committee 31 on Gas Cylinders of Standardization Administration of China (SAC/TC 31).
The drafting organizations of this document. Shijiazhuang Enric Gas Equipment Co., Ltd.;
China Special Equipment Inspection & Research Institute; Xinxing Energy Equipment Co.,
Ltd.; Beijing Tianhai Industry Co., Ltd.; Zhejiang REIN Gas Equipment Co., Ltd.; Zhejiang
Jindun Pressure Vessel Co., Ltd.
The main drafters of this document. Wang Hongxia, Huang Qianghua, Yang Minggao, Zhang
Baoguo, Bo Ke, Wu Changsheng, Zhang Junpeng, Yang Baoying, Chen Fan, Ma Xiakang.
This document was firstly issued in 2016.This is the first revision.
Large Capacity Seamless Steel Gas Cylinders
1 Scope
This document specifies the type and parameters, technical requirements, test methods,
inspection rules, marking, coating, packaging, transportation and storage of large capacity
seamless steel gas cylinders (hereinafter referred to as the “gas cylinders”).
This document is applicable to mobile gas cylinders that can be refilled with compressed gas
or liquefied gas, which are used under a normal ambient temperature of 40 C ~ +60 C, and
with a nominal operating pressure of 10 MPa ~ 35 MPa, and a nominal water capacity greater
than 150 L, and less than or equal to 3,000 L.
Steel cylinders with a nominal capacity greater than 3,000 L, and less than or equal to 4,200 L
may take the relevant stipulations of this document as a reference.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in the text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 196 General Purpose Metric Screw Threads - Basic Dimensions (GB/T 196-2003, ISO
724.1993, MOD)
GB/T 222-2006 Permissible Tolerances for Chemical Composition of Steel Products
GB/T 223 (all parts) Methods for Chemical Analysis of Iron, Steel and Alloy
GB/T 224 Determination of the Depth of Decarburization of Steels (GB/T 224-2019, ISO
3887.2017, MOD)
GB/T 226 Test Method for Macrostructure and Defect of Steel by Etching
GB/T 228.1 Metallic Materials - Tensile Testing - Part 1.Method of Test at Room Temperature
(GB/T 228.1-2021, ISO 6892-1.2019, MOD)
GB/T 229 Metallic Materials - Charpy Pendulum Impact Test Method (GB/T 229-2020, ISO
148-1.2016, MOD)
GB/T 231.1 Metallic Materials - Brinell Hardness Test - Part 1.Test Method (GB/T 231.1-2018,
ISO 6506-1.2014, MOD)
3 Terms, Definitions and Symbols
3.1 Terms and Definitions
What is defined in GB/T 13005, and the following terms and definitions are applicable to this
document.
3.2 Symbols
The following symbols are applicable to this document.
A compression area of internal thread opening, (mm2);
An shear area of internal thread profile, (mm2);
Aw shear area of external thread profile, (mm2);
4 Type, Parameters and Model
4.1 Type
Generally, the structural type of the cylinder body is shown in Figure 1.
Figure 1 -- Structural Type of Cylinder Body
4.2 Parameters
Generally, the nominal water capacity and nominal diameter of the gas cylinders shall comply
with the stipulations of Table 1.
4.3 Model
The model of the gas cylinder is composed of the following parts.
5 Technical Requirements
5.1 Materials
5.1.1 Cylinder body
5.1.1.1 The materials used to manufacture the cylinder body shall be non-aging killed steel that
is subject to off-furnace refining by electric arc furnace and vacuum refining treatment, or off-
furnace refining by an oxygen converter and vacuum refining treatment.
5.1.1.2 The selection of the cylinder body materials shall be compatible with the medium that
it contains.
5.1.1.6 The manufacturing organization of seamless steel pipes shall provide a quality
certificate for seamless steel pipes and steel billets, or a quality certificate of seamless steel
pipes with quality certification information of steel billets.
5.1.2 Screw plug
5.2 Design
5.2.1 General stipulations
5.2.1.1 The steel cylinders are only allowed to contain compressed gas or liquefied gas that is
compatible with the cylinder material and complies with the corresponding standards; when the
steel cylinders contain compressed natural gas or hydrogen, the compressed natural gas as
vehicle fuel shall comply with the stipulations of GB 18047, and the compressed natural gas
for civilian use shall comply with the stipulations of Class I and Class II natural gas in GB
17820-2018; the hydrogen shall comply with the stipulations of GB/T 3634.1 or GB/T 3634.2
or GB/T 37244.
5.2.2 Calculation of cylinder body wall thickness
The minimum design wall thickness a of the cylinder body shall be calculated in accordance
with Formula (1).
5.2.4 Bottlenecks
5.2.4.1 The bottlenecks at both ends of the steel cylinder shall be connected with threads that
comply with the corresponding standards. The following threads can be adopted.
5.2.5 Safety relief device
5.2.6 Screw plug
The screw plugs at both ends of the steel cylinder shall be made of forgings and shall comply
with the stipulations of Class III forgings in NB/T 47008-2017 and NB/T 47010-2017.
5.3 Manufacturing
5.3.1 General requirements
5.3.1.1 The manufacturing of the steel cylinders shall comply with the stipulations of this
document, and the stipulations of product drawings and relevant technical documents.
5.3.6 Hardness test
The cylinder body and test rings heat-treated in the same batch with the same furnace shall be
tested for hardness one by one after heat treatment.
5.3.7 Hydrostatic test
After the bottleneck of the cylinder body is subject to thread machining, the external hydrostatic
test shall be carried out one by one.
5.3.8 Non-destructive testing
The cylinder body shall undergo online 100% ultrasonic testing and 100% magnetic particle
testing one by one.
6 Test Methods
6.1 Wall Thickness and Manufacturing Tolerances
The cylinder body shall be subject to full coverage ultrasonic thickness measurement on
ultrasonic testing equipment in accordance with GB/T 11344.
6.2 Interior and Exterior
Conduct visual inspection on the internal and external surfaces. The inner surface can be
inspected with the aid of an endoscopic light or endoscope.
6.3 Bottleneck Thread
The bottleneck thread shall be inspected for thread dimensions and tolerances using the
corresponding thread gauge. In accordance with the methods specified in NB/T 47013.4-2015
or NB/T 47013.5-2015, conduct magnetic particle testing or penetrant testing on the thread
surface.
6.4 Determination of Various Performance Indicators after Heat Treatment of
Cylinder Body
6.4.1 Sampling
6.4.2 Tensile test
6.4.2.1 The determination items of the test include tensile strength, yield strength and
elongation after break.
6.4.2.2 The test adopts full-wall thickness longitudinal arc-shaped specimens. The shape and
dimensions of the specimens shall comply with the stipulations of Figure 3.Except at the
clamped ends, the specimens shall not be flattened.
6.4.3 Impact test
6.4.3.1 Specimens shall be taken close to the inner wall.
6.4.4 Metallographic examination
6.4.4.1 The preparation and test methods of the specimens shall comply with GB/T 13298.
6.4.4.2 The microstructure shall be evaluated in accordance with GB/T 13320.
6.4.4.3 The grain size shall be evaluated in accordance with GB/T 6394-2017.
6.4.4.4 The depth of the decarburized layer shall be determined in accordance with GB/T 224.
6.4.5 Flattening test
6.4.6 Cold bending test
6.4.6.1 After repeated heat treatment, when the remaining length of the test ring is not enough
for the cutting of the flattening test sample ring, it is allowed to adopt the cold bending test
instead of the flattening test.
6.4.6.2 From the symmetrical part of the test ring, along the circumferential direction, take two
bending specimens with an arc length of 300 mm and a width of 80 mm. The arc surface on the
specimen representing the inner and outer walls of the cylinder bottle is not machined.
6.4.6.3 The cold bending test shall be carried out in accordance with GB/T 232.The bending
center diameter equals to twice the measured average thickness of the cold bending specimens,
and the bending angle is 180. The schematic diagram of the cold bending test is shown in
Figure 5.
7 Inspection Rules
7.1 Judgment Bases of Tests and Inspections
7.1.1 Wall thickness and manufacturing tolerances
7.1.1.1 The wall thickness shall not be lower than the minimum design wall thickness, and the
wall thickness deviation of the cylinder body shall not exceed +20%.
7.1.2.2 There shall be no visible shrinkage cavities, wrinkles, protrusions and oxide scales on
the inner and outer surfaces of the ends. The end defects are allowed to be removed by
mechanical processing methods, but the design wall thickness of the ends shall be ensured.
7.1.2.3 There shall be a smooth transition between the end and the cylinder body, and no groove
marks are allowed on the shoulder part.
7.1.3 Bottleneck thread
7.1.3.1 The thread profile, dimensions and tolerances shall comply with the stipulations of
relevant standards.
7.1.4 Determination of various performance indicators after heat treatment of cylinder
body
7.2 Inspection One by One
Each steel cylinder manufactured in the same batch shall be inspected one by one. The
inspection items shall comply with the stipulations of Table 6.
7.3 Batch Test
Before exiting the factory, the steel cylinders shall be subject to batch inspection. The inspection
items shall comply with the stipulations of Table 6.
7.4 Type Test
7.4.1 Under one of the following circumstances, the steel cylinders shall undergo type test.
7.4.2 Type test shall be carried out in accordance with the items specified in Table 6.If the
product fails the type test, it shall not be put into mass production or put into use.
8 Marking, Coating, Packaging, Transportation and Storage
8.1 Marking
8.1.1 Steel seal mark
8.1.2 Colored mark
Comply with GB/T 7144.
8.1.3 Electronic identification mark of steel cylinder
8.2 Coating
8.2.1 Before coating, the surface of the steel cylinder shall be treated, so as to remove rust,
oxide scales, greasy dirt and other impurities. The surface quality shall reach Level Sa2.5
specified in GB/T 8923.1-2011, and coating can be performed under dry conditions.
8.3 Packaging
8.3.1 When exiting the factory, the steel cylinder usually includes the cylinder body, screw plugs
at both ends and other accessories. Protective measures shall be taken for all accessories and
the threads at both ends of the cylinder body, so as to prevent collision damage.
8.4 Transportation
8.4.1 The transportation of the steel cylinders shall comply with the relevant stipulations on
road transportation.
8.4.2 During transportation, loading and unloading of the steel cylinders, they shall be protected
from collision, moisture and damage to accessories.
8.5 Storage
9 Product Certificate, Instruction Manual and Batch Inspection Quality Certificate
9.1 Product Certificate
9.1.1 Each steel cylinder exiting the factory shall be accompanied by a product certificate, and
a product instruction manual shall be provided to users.
9.1.2 The product certificate of exiting-factory product shall at least include the following
contents.
9.2 Product Instruction Manual
It shall at least include the following contents.
9.3 Batch Inspection Quality Certificate
9.3.1 The content of the batch inspection quality certificate shall include the batch inspection
items specified in this document.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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