PDF GB/T 17259-2024 English (GB 17259-2009: Older version)
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Liquefied petroleum gas steel cylinders for vehicles
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[GB/T 17259-2009] Steel cylinders for the liquefied petroleum gas for vehicles
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Steel cylinders for the liquefied petroleum gas for vehicles [including MODIFICATION 1]
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GB/T 17259-2024: PDF in English (GBT 17259-2024) GB/T 17259-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.020.30
CCS J 74
Replacing GB/T 17259-2009
Liquefied petroleum gas steel cylinders for vehicles
ISSUED ON. APRIL 25, 2024
IMPLEMENTED ON. NOVEMBER 01, 2024
Issued by. State Administration for Market Regulation;
National Standardization Administration.
Table of Contents
Foreword... 3
1 Scope... 6
2 Normative references... 6
3 Terms and definitions... 7
4 Symbols... 7
5 Type... 8
6 Materials... 10
7 Design... 11
8 Manufacturing... 17
9 Test methods and inspection rules... 21
10 Marking, coating, packaging, storage and transportation, exit-factory documents 32
11 Design service life of vehicle cylinders... 34
Appendix A (Normative) Stamped marking of liquefied petroleum gas cylinders for
motor vehicles... 35
Appendix B (Informative) Safety tips for vehicle cylinders... 36
Appendix C (Informative) Product certificate format for vehicle cylinders... 37
Appendix D (Informative) Format of vehicle cylinder batch quality certificate... 39
References... 42
Liquefied petroleum gas steel cylinders for vehicles
1 Scope
This document specifies the type, material, design, manufacturing, test methods and
inspection rules, marking, packaging, coating, storage and transportation, design
service life and exit-factory documents of liquefied petroleum gas cylinders for motor
vehicles (hereinafter referred to as vehicle cylinders).
This document is applicable to LPG cylinders for road motor vehicles and LPG
cylinders for on-site motor vehicles, which are designed and manufactured for use at
ambient temperature (-40 °C ~ 60 °C), at a nominal working pressure of 2.2 MPa, a
nominal volume of 20 L ~ 240 L, can be repeatedly filled in accordance with GB 19159.
2 Normative references
The contents of the following documents constitute the essential terms of this document
through normative references in the text. Among them, for dated references, only the
version corresponding to that date applies to this document; for undated references, the
latest version (including all amendments) applies to this document.
GB/T 150.3 Pressure vessels - Part 3.Design
GB/T 222 Permissible tolerances for chemical composition of steel products
GB/T 228.1 Metallic materials - Tensile testing - Part 1.Method of test at room
temperature
GB/T 1804 General tolerances - Tolerances for linear and angular dimensions
without individual tolerance indications
GB/T 2651 Destructive tests on welds in metallic materials - Transverse tensile test
GB/T 2653 Bend test methods on welded joints
GB/T 7144 Colored cylinder mark for gases
GB/T 9251 Methods for hydrostatic test of gas cylinders
GB/T 9252 Method for pressure cycling test of gas cylinders
GB/T 12137 Methods for leakage test of gas cylinders
shall be carried out in accordance with the equal area method of GB/T 150.3 or by finite
element analysis. The reinforcement material shall be compatible with the welding
performance of the cylinder body material.
7.3.3 The diameter of the circular opening shall not exceed 40% of the outer diameter
of the cylinder body. The distance between the edge of the hole and the outer
circumference of the end cap, which is measured in the vertical direction of the axis of
the end cap, should not be less than 10% of the outer diameter of the cylinder body.
7.3.4 When openings with non-circular cross-sections or circular openings with a
diameter exceeding 40% of the outer diameter of the cylinder body are made, finite
element analysis and pressure cycle test verification shall be carried out.
7.3.5 The welding of all openings and connectors of the cylinder body shall ensure full
penetration; the protruding parts after welding, including valve seats and pipe joints,
shall not be greater than 35 mm from the outer surface of the cylinder body.
7.4 Welded joints
7.4.1 The welded joints of the main welds shall adopt the full penetration butt joint form.
7.4.2 There shall be no permanent pads for longitudinal welds; permanent pads are
allowed for circumferential welds, or integral pads with stepped shapes on one side of
the joints.
7.5 Accessories
7.5.1 The integrated valves in accordance with GB/T 18299 shall be used for vehicle
cylinders. The integrated valves shall generally include a filling device, an 80% filling
limit device, a safety valve, a stop valve, and a liquid level display device. The safety
valve can also be separately set at the gas phase position of the vehicle cylinder near
the integrated valve, meanwhile a safety protection device shall be set. The selected
model shall be within the coverage of the integrated valve type test certificate. The
safety valve on the integrated valve shall also be set at the gas phase position of the
vehicle cylinder. The opening pressure of the safety valve shall be 2.5 MPa ± 0.2 MPa;
the return pressure shall not be less than 2.2 MPa; the discharge volume shall not be
less than the calculated value of formula (4) at 2.64 MPa.
Where.
Q - The discharge volume of air under standard conditions (absolute pressure 0.1
MPa, 15 °C), in cubic meters per minute (m3/min);
Ao - The outer surface area of the shell of the vehicle cylinder, in square meters (m2).
8.4.2.2 The butt weld of the cylinder body and the fillet weld of the valve seat shall be
welded by automatic welding method; the qualified welding process shall be followed.
8.4.2.3 The shape and size of the welding groove shall comply with the requirements
of the drawing. The groove surface shall be clean and smooth; it shall not have defects
such as cracks, delamination and slag inclusions and other residual substances.
8.4.2.4 Welding (including welding repair) shall be carried out indoors; the indoor
relative humidity shall not be greater than 90%; otherwise, effective measures shall be
taken. When the temperature of the welded part is lower than 0 °C, it shall be preheated
at the welding place; the preheating temperature shall not be lower than 15 °C.
8.4.2.5 When welding, the arc shall not be struck at non-welding places. The
longitudinal weld shall have an arc-starting plate and an arc-extinguishing plate; the
plate length shall not be less than 100 mm. When removing the arc-starting plate and
the arc-extinguishing plate, the cutting method shall be adopted; the knocking method
shall not be used; the cut-off place shall be polished.
8.4.3 Welds
8.4.3.1 The butt weld of the cylinder body and the fillet weld of the valve seat shall be
a full penetration structure.
8.4.3.2 The appearance of the weld surface shall meet the following requirements.
a) The weld and heat-affected zone shall not have defects such as cracks, pores, arc
pits, slag inclusions, non-fusion, etc.;
b) The weld of the cylinder body is not allowed to undercut; the weld of the cylinder
body accessories is not allowed to undercut on the cylinder body side;
c) The weld surface shall not have depressions or irregular sudden changes;
d) The spatter on both sides of the weld shall be cleaned;
e) The residual height of the cylinder body butt weld is 0 mm ~ 3.5 mm; the
difference between the widest and narrowest parts of the same weld shall not be
greater than 4 mm;
f) Where there is no requirement in the drawing, the weld leg height of the fillet weld
shall not be less than the thickness of the thinner one of the welded parts; its
geometric shape shall smoothly transition to the surface of the parent material.
8.4.4 Repair of welds
8.4.4.1 Repair of welds shall have a repair process that has been evaluated and qualified.
8.4.4.2 The repaired parts of longitudinal and circumferential welds shall be re-
inspected for appearance and radiography and qualified; the qualified level shall
comply with the provisions of 9.1.4.
8.4.4.3 The same part of the weld is only allowed to be repaired once.
8.4.4.4 The repaired part shall be recorded in the product production inspection record.
8.5 Heat treatment
8.5.1 After all welding is completed, the vehicle cylinder shall be subjected to overall
stress relief heat treatment. The heat treatment device shall have automatic temperature
control and real-time recording functions. The temperature of the effective heating zone
shall not exceed the set temperature ±25 °C. There shall be no less than 3 temperature
measurement points in the furnace used for actual production; it shall be able to reflect
the temperature change trend of the temperature field of the entire effective heating
zone. The repaired cylinder shall be re-heat treated after the repair is completed.
8.5.2 The heat treatment of the vehicle cylinder shall be evaluated for the heat treatment
process. For vehicle steel cylinders with a nominal volume not exceeding 150 L, the
heat treatment process's assessment verification test shall include mechanical property
test and water pressure burst test; for vehicle steel cylinders with a nominal volume
greater than 150 L, the heat treatment process's assessment verification test shall only
conduct mechanical property test on the test plate.
8.5.3 When the main material designation or plate thickness specification, vehicle steel
cylinder structure type, heat treatment equipment, and heat treatment method are
changed, the heat treatment process assessment shall be re-performed. For vehicle steel
cylinders with the same size, structure and plate thickness specifications, the same
welding and the same heat treatment specifications, after the heat treatment process
assessment is qualified, no assessment is required in the subsequent production process.
9 Test methods and inspection rules
9.1 Weld seam radiographic and magnetic particle inspection
9.1.1 Weld seam radiographic inspection shall be carried out in accordance with the
provisions of NB/T 47013.2 or GB/T 17925; magnetic particle inspection of the fillet
weld of the valve seat of the cylinder body shall be carried out in accordance with the
provisions of NB/T 47013.4.
9.1.2 For vehicle cylinders with only one circumferential weld, one cylinder shall be
randomly selected for every 50 cylinders in the production order (one cylinder shall
also be selected if there are less than 50 cylinders), to perform 100% radiographic
inspection on the circumferential weld. If unqualified, two more cylinders shall be
selected for inspection. If one cylinder is still unqualified, each cylinder shall be
inspected one by one.
9.1.3 The radiographic inspection of the longitudinal and circumferential welds of the
vehicle cylinder shall be conducted in accordance with NB/T 47013.2 or GB/T 17925.
When it is designed with weld coefficient Ф = 1.0, 100% radiographic inspection shall
be conducted on the longitudinal and circumferential welds one by one. When it is
designed with weld coefficient Φ = 0.9, the longitudinal and circumferential welds shall
be inspected one by one for not less than 20% of the total length of each weld. For
vehicle cylinders with longitudinal and circumferential welds, the radiographic area
shall include the intersection of the longitudinal and circumferential welds and extend
from the intersection to both sides of the circumferential weld by no less than 25 mm,
the longitudinal weld shall extend by no less than 100 mm. If defects exceeding the
requirements of this document are found, the length of the weld shall be extended by
20% at both ends of the defect for radiographic inspection. If the length of one end is
insufficient, it shall be supplemented at the other end. If there are still defects exceeding
the requirements of this document, the weld shall be 100% radiographically inspected.
For vehicle cylinders with a nominal volume greater than 150 L and with product
welded test plates, 100% radiographic inspection shall also be carried out on the welds
of the welded test plates.
9.1.4 After the weld is radiographically inspected, it shall be evaluated in accordance
with NB/T 47013.2.The quality of the radiographic film or image quality is grade AB;
if the weld defect grade is not less than grade II, it is qualified. After the magnetic
particle inspection of the fillet weld of the valve seat of the cylinder body, it shall be
evaluated in accordance with NB/T 47013.4.There shall be no cracks; if the weld defect
grade shall not be lower than grade I, it is qualified. If cracks, lack of fusion and other
excessive defects are found, grinding or repair welding shall be carried out; the part
shall be inspected according to the original non-destructive testing method; records
shall be kept at any time.
9.2 Inspection one-by-one
9.2.1 General inspection
9.2.1.1 The appearance of the weld shall comply with the provisions of 8.4.3.2; the weld
misalignment and edge height shall comply with the provisions of 8.3.2.
9.2.1.2 The surface of the vehicle cylinder shall be smooth; there shall be no cracks,
double skin, slag inclusions, pits with a depth of more than 0.5 mm, scratches, corrosion
and defects with a depth of more than 0.3 mm.
9.2.1.3 The accessories of the vehicle cylinder shall comply with the provisions of 7.5.
9.2.1.4 The inside of the vehicle cylinder shall be dry and clean.
9.2.2 Weight and volume
9.2.2.1 The measured volume of vehicle cylinders shall not be less than their nominal
volume. For vehicle cylinders with a nominal volume greater than 150 L, the measured
9.2.5.1 If leakage or seepage is found on the weld of the cylinder body during the water
pressure test or air tightness test, it shall be repaired in accordance with the requirements
of 8.4.4; if there is leakage in the parent material of the cylinder body, it shall be
scrapped.
9.2.5.2 After the weld of the vehicle cylinder is repaired, the vehicle cylinder shall be
reheat treated; the water pressure test and air tightness test shall be re-performed in
accordance with the provisions of 9.2.3 and 9.2.4.
9.3 Batch inspection
9.3.1 Group-batching
The vehicle cylinders produced continuously with the same design, the same
designation of main material, the same welding process, the same heat treatment
process are considered as a batch.
For vehicle cylinders with a nominal volume of not more than 150 L, no more than 500
pcs are considered as a batch (excluding cylinders for destructive tests); for vehicle
cylinders with a nominal volume of more than 150 L, no more than 50 pcs are
considered as a batch.
9.3.2 Test cylinders
One cylinder for water pressure burst test is extracted from each batch of vehicle
cylinders.
For vehicle cylinders with a nominal volume of no more than 150 L, one sample
cylinder shall be drawn per batch for mechanical properties test and valve seat weld
dissection inspection; the sample cylinder shall be qualified by radiographic detection
and one-by-one inspection. For vehicle cylinders with a nominal volume of more than
150 L, product welding test plates may be prepared in batches for mechanical properties
test.
If it cannot be produced continuously. For vehicle cylinders with a nominal volume of
no more than 150 L, at least one cylinder for mechanical properties test and one cylinder
for hydraulic burst test shall be taken per shift; for vehicle cylinders with a nominal
volume of more than 150 L, product welding test plates shall be prepared per shift for
mechanical properties test.
9.3.3 Mechanical properties
9.3.3.1 Sampling shall meet the following requirements.
a) For vehicle cylinders with only one circumferential weld, a base material tensile
test specimen shall be cut from the straight edge of the vehicle cylinder end cap.
If the straight edge is not long enough, it can be cut from the curved surface of
use water or oil as the test medium; the upper limit pressure of the cycle is 3.3 MPa, the
lower limit pressure of the cycle is 0.3 MPa; at a frequency not exceeding 15 times/min.
after 12000 pressure cycles, the vehicle cylinder shall be leak-free.
9.5 Vibration test
Fill the vehicle cylinder with the maximum filling amount of water + nitrogen or air at
the nominal working pressure, to reach the rated filling amount. The test is carried out
at room temperature. The test shall be loaded along the three orthogonal axes of the
tested vehicle cylinder. The test is carried out on a sinusoidal vibration table, with a
constant acceleration of 1.5 g and a frequency range of 5 Hz ~ 200 Hz. The test shall
be carried out for 30 minutes in each of the three orthogonal axes. Each axis shall
include two test processes of 5 Hz ~ 200 Hz ~ 5 Hz; each test process shall be carried
out for 15 minutes.
After the vibration test, the vehicle cylinder is inspected. There shall be no leakage in
any part; the valves and accessories shall not be damaged.
9.6 Fire test
9.6.1 The test vehicle cylinder shall be filled with liquefied petroleum gas to the rated
filling amount. The vehicle cylinder shall be horizontally erected or hoisted and fixed;
the safety accessories shall face upward; the flame shall not directly burn the safety
accessories; metal plates are allowed to be used as protective covers for valves. A
thermocouple for temperature measurement is fixed symmetrically at the center of the
outer side of the cylinder of the vehicle cylinder. The temperature measuring instrument,
meter line, pressure gauge shall be safely led into the concealed body or protective
barrier, to protect the safety of the test personnel and ensure that the temperature and
pressure changes can be measured normally during the test.
9.6.2 The test uses 20# diesel, LPG or CNG as fuel. An oil pan (trough) or combustion
row is placed at the bottom of the vehicle cylinder. The lowest point of the vehicle
cylinder is 120 mm ~ 130 mm above the fire source; the size of the oil pan (trough) or
combustion row shall be sufficient to place the edge of the vehicle cylinder completely
in the flame. The length and width of the oil pan (trough) or combustion row shall be
at least 200 mm longer than the length and width of the vehicle cylinder, which is
projected on the horizontal plane, but not more than 400 mm; the height of the oil pan
is calculated from the oil surface, the surrounding height is no more than 50 mm above
the oil surface; the fuel shall be sufficient to ensure sufficient combustion for 10 minutes,
or sufficient to completely discharge the liquefied petroleum gas in the vehicle cylinder.
9.6.3 The test site shall be far away from tall buildings, densely populated areas and
forests; necessary safety and fire prevention measures shall be taken. The wind speed
at the test site shall not exceed 2.2 m/s.
9.6.4 Record the layout of the fire test, the pressure in the vehicle cylinder, the time
from ignition to the opening of the safety valve, the time from the opening of the safety
valve to the pressure in the cylinder dropping to 0.1 MPa. During the test, the time
interval between recording the thermocouple temperature and the pressure in the
vehicle cylinder shall not exceed 10 s.
9.6.5 When the pressure in the vehicle cylinder reaches the opening pressure, the safety
valve shall open and return to the seat normally, at least once; the cylinder body is
qualified if there is no rupture or explosion during the test.
9.7 Explosion shock test
Fill the test vehicle cylinder with liquefied petroleum gas to the rated filling volume.
The cylinder is fixed horizontally on the cement floor; 50 g of nitramine equivalent
explosives are piled on the upper surface of the middle part of the cylinder; then
detonated. The cylinder is qualified if it is not damaged after the explosion.
9.8 Repeated test
9.8.1 If the items tested one by one are unqualified, they can be tested again after
processing or repair. If they still fail, they will be scrapped.
9.8.2 In the batch test items, if there is evidence that there is an operational error or
measurement error, a second test shall be conducted on the same cylinder or another
cylinder in the same batch of cylinders or on the original product welding test plate. If
the second test is qualified, the first test can be ignored.
9.8.3 For vehicle cylinders with a nominal volume of not more than 150 L, if the
mechanical properties test fails, 4 more test cylinders shall be taken from the same batch
of vehicle cylinders, 2 of which are subjected to mechanical properties test and 2 to
hydraulic pressure burst test; if the hydraulic pressure burst test fails, 5 more test
cylinders shall be taken from the same batch of cylinders, 1 of which is subjected to
mechanical properties test and 4 to hydraulic pressure burst test.
9.8.4 If there are still unqualified results after re-testing, the batch of vehicle cylinders
will be judged as unqualified. However, it is allowed to reheat treat this batch of vehicle
cylinders, or reheat treat them after repair, then retest them as a new batch.
9.9 Type test
9.9.1 Type test shall be carried out for any of the following conditions.
a) New products developed;
b) Changes to the original design;
c) For the same type of vehicle cylinders manufactured by the same manufacturing
process, the manufacturing is interrupted for 12 months and then resumed;
exit-factory documents
10.1 Marking
10.1.1 The content of the steel stamping mark on the vehicle cylinder shall comply with
the provisions of TSG 23.
10.1.2 The content and arrangement of the steel stamping mark printed on the shield of
the in-field motor vehicle cylinder and the steel stamping sign plate welded on the
cylinder of the road motor vehicle cylinder shall be in accordance with Appendix A.
The height of the steel stamping font shall be 6 mm ~ 20 mm, the depth shall be 0.5
mm, the font shall be obvious and clear.
10.1.3 The unique cylinder number of each vehicle cylinder. For in-field motor vehicle
cylinders, it is engraved on the shield; for road motor vehicle cylinders, it is printed on
the steel stamping sign plate and the corresponding electronic reading mark is pasted
nearby. For the cylinder numbers engraved in a conspicuous position on the motor
vehicle cylinder shield on site, the cylinder numbers stamped on the steel stamped sign
of the motor vehicle cylinder on the road, as well as the electronic readable marks
affixed, a welded ceramic QR code shall be used and ensured not to fall off or be
damaged; meanwhile the electronic readable marks that can effectively trace the quality
information of the vehicle cylinder products within the designed service life. The
manufacturer shall establish a public website for the quality and safety traceability of
vehicle cylinders. The public information of each qualified vehicle cylinder shipped out
of the factory (including product certificates, batch quality certificates, inspection
certificates, type test certificates, etc.) shall be entered into the public website platform
for public display and for user query.
10.1.4 Vehicle cylinders shall be affixed with safety tips according to user needs, see
Appendix B for details. Safety tips are printed on self-adhesive paper and affixed to the
inner wall of the vehicle cylinder shield or a part that is not easily damaged or detached,
due to collision or friction.
10.2 Coating
10.2.1 The surface of vehicle cylinders shall be coated with YR05 brown, in accordance
with the provisions of GB/T 7144.
10.2.2 Before coating, the surface of vehicle cylinders shall be cleaned of oil, rust and
other debris; the coating shall be carried out under dry conditions. The coating shall be
uniform and firm; there shall be no defects such as bubbles, flow marks, cracks, peeling.
10.2.3 The surface of the cylinder shall be printed with "Liquefied petroleum gas" in
white long Fangsong Chinese characters, with a height of 60 mm ~ 80 mm; the name
of the manufacturer shall be printed in Chinese characters below.
10.3 Packaging, storage and transportation
10.3.1 The vehicle cylinders shipped out of the factory are packed in fabric woven bags
or other forms of packaging; they can be packaged separately according to the user's
requirements.
10.3.2 Vehicle cylinders shall be protected from collision and damage during
transportation, loading, unloading.
10.3.3 Vehicle cylinders shall be stored in a place without corrosive gas, ventilated, dry,
not exposed to sunlight.
10.4 Exit-factory documents
10.4.1 Each vehicle cylinder shall have a product certificate (paper or electronic
certificate) when it leaves the factory. The format of the product certificate is shown in
Appendix C. The content recorded in the product certificate shall be consistent with the
production inspection records kept by the manufacturer.
10.4.2 Each batch of vehicle cylinders shipped out of the factory shall have a batch
quality certificate. The format is shown in Appendix D. Where there are more than one
user of this batch of vehicle cylinders, a copy of the batch quality certificate with the
manufacturer's special inspection seal can be provided to the user.
10.4.3 Product certificates and batch quality certificates shall be signed or stamped by
the responsible inspection engineer of the manufacturer.
11 Design service life of vehicle cylinders
11.1 Design service life
The design service life of vehicle cylinders manufactured in accordance with this
document shall be no less than 15 years.
11.2 Printing of service life
The design service life of vehicle cylinders shall be stamped on the shield of the vehicle
cylinders (see Appendix A).
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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