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This standard is drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 5100-2011 Welded Steel Gas Cylinders in whole.
In addition to a number of editorial changes, the following main technical changes have been made with respect to the GB/T 5100-2011:
— the application scope of the standard is expanded;
— the requirements for materials are modified;
— the design method and wall thickness design formula are modified;
— the requirements and calculation methods of opening reinforcement are clarified.
This standard has been redrafted and modified adoption of International Standard ISO 4706:2008 Gas Cylinders — Refillable Welded Steel Cylinder —Test Pressure 60 bar and Below, but is not equivalent to ISO 4706:2008.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.
This standard was proposed by and is under the jurisdiction of the National Technical Committee 31 on Cylinder of Standardization Administration of China (SAC/TC 31).
The previous editions of this standard are as follows:
— GB 5100-1985, GB 5100-1994, GB/T 5100-2011.
Welded Steel Gas Cylinders
1 Scope
This standard specifies basic parameters, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of welded steel gas cylinders (hereinafter referred to as "cylinders").
This standard is applicable to refillable cylinders that can be filled with low-pressure liquefied gas and cylinders with porous fillers and filled with acetylene gas, which of a test pressure not greater than 12 MPa (gauge pressure), and of water capacities from 0.5 L up to and including 1000 L exposed to normal ambient temperatures (-40°C to 60°C).
This standard also applicable to cylinders filled with low pressure liquefied gases and mixtures of compressed gases for fire fighting.
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 232 Metallic Materials — Bend Test
GB/T 1804 General Tolerances — Tolerances for Linear and Angular Dimensions without Individual Tolerance Indications
GB/T 7144 Coloured Cylinder Mark for Gases
GB/T 8335 Special Threads for Gas Cylinders
GB/T 9251 Methods for hydrostatic test of gas cylinders
GB/T 9252 Method for pressure cycling test of gas cylinders
GB/T 12137 Method for leakage test of gas cylinders
GB/T 13005 Terminology of gas cylinders
GB/T 14193 Rules for Filling of Liquefied Gas Cylinders
GB/T 15383 Connection Types and Dimensions for Gas Cylinder Valve Outlets
GB/T 15385 Method for Hydraulic Burst Test of Gas Cylinder
GB/T 17925 Standard Practice for X-ray Digital Radioscopic Examination of Cylinder Weld
GB/T 33209 Welding Procedure Qualification for Welded Gas Cylinders
NB/T 47013 (all parts) Nondestructive Testing of Pressure Equipment
NB/T 47018 (all parts) Technical Permission of Welding Materials for Pressure Equipment
JJG 14 Verification Regulation of Nonself-indicating Weighing Instrument
3 Terms, Definitions and Symbols
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 13005 and the following apply.
3.1.1
batch
quantity of cylinders made consecutively to the same design, size and material specifications using the same type of welding machines, welding procedures and to the same heat treatment conditions
3.1.2
main body of the cylinder
the part of cylinder composed of head and barrel or two heads
3.1.3
effective thickness
nominal wall thickness of cylinder (or nozzles) minus corrosion margin and negative deviation of material thickness
3.2 Symbol
For the purposes of this document, the following symbols apply.
a — the clearance between the curved surface at the cylinder head and the template, mm;
A — elongation after fracture of the specimen, %;
b — misalignment of welds, mm;
c — concave-convex amount of cylinder head surface, mm;
d — bending axis diameter in bending test, mm;
D — nominal diameter of cylinder, mm;
Di — inside diameter of the cylinder, mm;
Do — outside diameter of the cylinder, mm;
e — difference between the maximum and minimum diameter of the same section of the cylindrical shell, mm;
E — corner height of butt weld, mm;
h — height of straight side of cylinder head, mm;
Hi — height of the internal convex side of cylinder head, mm;
K — shape factor of cylinder head;
KV2 — absorbed energy of impact, J;
l — length of the template, mm;
L — length of main body of the cylinder, mm;
N — the maximum opening diameter, mm;
n — ratio of bending axis diameter to specimen thickness;
P — nominal working pressure, MPa;
Pb — actually measured burst pressure of the cylinder, MPa;
Ph — actual test pressure applied to the cylinder, MPa;
r — inside knuckle radius of the cylinder head, mm;
ReL — yield strength or the yield point of material under normal temperature, MPa;
Ri — inside radius of hemispheric part for the cylinder head, mm;
Rn — tensile strength determined by standards, MPa;
Rna — actually measured tensile strength, MPa;
S — design wall thickness of main body of the cylinder, mm
S1 — design wall thickness of cylindrical shell, mm;
S2 — design wall thickness of the cylinder head, mm;
SC — thickness to be reinforced at the opening, mm;
Sh — thickness of the specimen, mm;
Sk — weld width of tensile specimen, mm;
Sn — nominal wall thickness of main body of the cylinder, that is, nominal wall thickness of the cylindrical shell, mm;
V — nominal capacity, L;
ΔHi — inner height tolerance (Hi + h) of the cylinder head, mm;
φ — weld joint factor;
πΔDi — tolerance of inner circumference, mm.
4 Basic Parameters
4.1 Nominal volume and diameter
The recommended values of nominal volume (V) of and nominal diameter (D) of the cylinder shall be in accordance with those specified in Table 1.
Table 1 Recommended values of nominal volume (V) of and nominal diameter (D) of the cylinder
Nominal volume (V)
L 1 to 10 >10 to 25 >25 to 50 >50 to 100 >100 to 150 >150 to 200 >200 to 600 >600 to 1 000
Nominal diameter (D)
mm 70, 100, 150 200, 217, 230 250, 300, 314 300, 314, 350 350, 400 400, 500 600, 700 800, 900
4.2 Nominal working pressure and actual test pressure
4.2.1 Nominal working pressure
The determination of nominal working pressure of cylinders shall follow the following principles:
a) For cylinders containing a mixture of low pressure liquefied and compressed gases, the nominal working pressure shall be the gas pressure in the cylinder when specified upper limit of ambient temperature is reached;
b) The nominal working pressure of cylinders containing low pressure liquefied gases shall not be less than the saturated vapor pressure of the medium containing the cylinders at 60°C;
c) The nominal working pressure selected for cylinders containing toxic and highly toxic liquefied gases shall be appropriately increased;
d) The saturated vapor pressure of low pressure liquefied gases at 60°C shall be specified according to GB/T 14193 or the corresponding gas standard.
4.2.2 Actual test pressure
For cylinders containing liquefied gases or a mixture of liquefied gases and compressed gases, the actual test pressure shall not be less than 1.5 times the nominal working pressure, and the actual test pressure of a cylinder containing acetylene gas is 5.2 MPa.
Foreword II
1 Scope
2 Normative References
3 Terms, Definitions and Symbols
4 Basic Parameters
5 Technical Requirements
6 Test Methods
7 Inspection Rules
8 Marking, Packaging, Transportation and Storage
9 Documentation
Annex A (Normative) Special Requirements of Cylinders for Containing Liquefied Propylene and Propane
Annex B (Informative) Product Certificate
Annex C (Informative) Quality Certificate of Batch Inspection
