GB 41317-2024 (GB/T 41317-2022) PDF English
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GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 91.140
CCS P 45
Stainless steel corrugated tubes for the connection of gas
appliances
Issued on: MARCH 09, 2022
Implemented on: OCTOBER 01, 2022
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 and definitions... 5
4 Classification, specifications and models... 7
5 Requirements... 8
6 Test methods... 12
7 Inspection rules... 26
8 Marking, packaging, transportation and storage... 29
References... 30
Stainless steel corrugated tubes for the connection of gas
appliances
1 Scope
This document specifies the classification, specifications and models, requirements,
test methods, inspection rules, as well as marking, packaging, transportation and
storage of stainless steel corrugated tubes for the connection of gas appliances
specified in GB/T 13611.
This document applies to stainless steel corrugated tubes for the connection of gas
burning appliances or gas equipment, of which the nominal dimension is not greater
than DN32 and the maximum working pressure is 0.01 MPa.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this
document and are indispensable for its application. For dated references, only the
version corresponding to that date is applicable to this document; for undated
references, the latest version (including all amendments) is applicable to this
document.
GB/T 191, Packaging - Pictorial marking for handling of goods
GB/T 196, General purpose metric screw threads - Basic dimensions
GB/T 1220, Stainless steel bars
GB/T 2828.1, Sampling procedures for inspection by attributes - Part 1.Sampling
schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection
GB/T 3280, Cold rolled stainless steel plate, sheet and strip
GB/T 4226, Cold finished stainless steel bar
GB/T 4240, Stainless steel wires
GB/T 4423, Copper and copper alloy cold-drawn rod and bar
GB/T 5231, Designation and chemical composition of wrought copper and copper
alloys
GB/T 7306.1, Pipe threads with 55 degree thread angle where pressure-tight joints
are made on the threads - Part 1.Parallel internal and taper external threads
GB/T 7306.2, Pipe threads with 55 degree thread angle where pressure-tight joints
are made on the threads - Part 2.Taper internal and external threads
GB/T 7307, Pipe threads with 55 degree thread angle where pressure-tight joints
are not made on the threads
GB/T 8815, Plasticized polyvinyl chloride (PVC) compounds for wire and cable
GB/T 9576, Rubber and plastics hoses and hose assemblies - Guidelines for
selection, storage, use and maintenance
GB/T 9577, Rubber and plastics hoses and hose assemblies - Rules for marking,
package and transportation
GB/T 10125, Corrosion tests in artificial atmospheres - Salt spray tests
GB/T 13657, Bisphenol-A epoxy resin
GB/T 14525, General specification for corrugated metal hose assemblies
GB/T 15065, Black polyethylene compounds for wire and cable
GB/T 16411, Universal test methods of gas burning appliances for domestic use
GB/T 20878, Stainless and heat-resisting steels - Designation and chemical
composition
GB/T 23658, Elastomeric seals - Material requirement for seals used in pipes and
fittings carrying gaseous fuels and hydrocarbon fluid
YS/T 649, Extruded rod and bar of copper and copper alloys
3 Terms and definitions
Terms and definitions determined by GB/T 14525 and the following ones are
applicable to this document.
3.1
Stainless steel corrugated tubes for the connection of gas appliances
The stainless steel corrugated tubes with a fixed length and a protecting coat, both
ends of which are provided with threaded joints for the connection of gas burning
appliances or gas equipment and pipelines.
4 Classification, specifications and models
4.1 Classification
4.1.1 Hose assemblies are classified – in terms of connection characteristics – as
follows.
a) Ordinary hose assembly. hoses only connected to stationary gas burning
appliances or gas equipment, coded RLB;
b) Super flexible hose assembly. hoses that can be connected to mobile or
stationary gas burning appliances or gas equipment, coded CRLB.
4.1.2 Hose assemblies are classified – in terms of use – as follows.
a) Hose for the connection of gas cooker. coded Z;
b) Hose for the connection of gas meter. coded B;
c) Hose for the connection of gas water heater. coded R;
d) Hose for the connection of other gas appliances. coded Q.
4.1.3 Hose assemblies are classified – in terms of corrugated shape – as follows.
a) helically corrugated tube. helically corrugation, coded L;
b) annularly corrugated tube. annularly corrugation, coded H.
4.2 Specifications
4.2.1 Hose assemblies are divided into DN10, DN15, DN20, DN25 and DN32 in
terms of nominal dimension.
4.2.2 The length of hose for the connection of gas cooker should be 500 mm, 800
mm, 1 000 mm, 1 500 mm and 2 000 mm; the length of hose for the connection of
gas meter and gas water heater should be 200 mm, 300 mm, 500 mm and 800 mm.
4.3 Models
The model compilation rules are as follows.
5.2.1 The surface of the hose assembly shall be bright and clean; there shall be no
obvious scratches and imprints; there shall be no obvious stains in the nozzle.
5.2.2 The wall thickness of the protecting coat shall be uniform; the corrugated part
of the tube shall be completely covered; there shall be a clear yellow mark; there
shall be no obvious impurities, scars, discolorations and cracks; the surface marking
shall be clear.
5.2.3 There shall be no cracks, sandish holes and other defects affecting performance
on the inner and outer surfaces of the joint.
5.2.4 The appearance of the sealing gasket shall be regular, without cracks, defects or
flash; the color shall be uniform.
5.3 Structure and size
5.3.1 Requirements for the nominal wall thickness of tubular blank.
a) The nominal wall thickness of ordinary tubular blanks shall not be less than
0.20 mm;
b) The nominal wall thickness of super flexible tubular blanks shall not be less
than 0.12 mm.
5.3.2 Requirements for the wall thickness of joint.
a) The wall thickness of copper joint shall not be less than 1.5 mm;
b) The wall thickness of stainless steel joint shall not be less than 1.0 mm.
5.3.3 Requirements for the screw threads of joint.
a) The connection of gas cooker, gas water heater or gas meter shall be sealed
with a sealing gasket; the thread of the hose joint connected to the gas cooker
or the gas water heater shall comply with the provisions of GB/T 7307; the
thread of the hose joint connected to the gas meter shall comply with the
provisions of GB/T 196;
b) When connected to gas pipelines or pipeline accessories, the thread used for
sealing shall comply with the provisions of GB/T 7306.1 or GB/T 7306.2; the
gasket used for sealing shall comply with the provisions of GB/T 7307.
5.3.4 The hose length deviation shall meet the requirements in Table 2.
Description of indexing numbers.
1 – inlet pressure regulator;
2 – thermometer;
3 – flow meter;
4 – inlet pressure gauge;
5 – outlet pressure gauge;
6 – differential pressure gauge;
7 – hose assembly;
8 – control valve;
a – 4 holes with a diameter of 1.5 mm;
A – pressure tapping point of the pressure pipe.
Note. D = d ~ 1.1d, where d is the connection size of the hose.
Figure 2 – Schematic diagram of flow test
6.5.4 Tensile resistance test
Connect the connecting joints at both ends of the hose sample whose length is not
less than 300 mm to the tensile test device. Gradually stretch to the tensile load
specified in Table 8 under the air with a pressure of 20 kPa; maintain the tensile load
for 5 minutes, and carry out the air tightness test according to the provisions of 6.5.2;
check whether the test results conform to the provisions of No. 4 in Table 4.
6.5.5 Heat resistance test
Place the hose sample in a constant temperature box at 120 °C ± 2 °C for 30 minutes;
then, take it out; after cooling to room temperature, carry out the air tightness test
according to the provisions of 6.5.2; check whether the test results meet the
provisions of No. 5 in Table 4.
6.5.6 Torsion test
6.5.13 Stress corrosion resistance test
Peel off the protecting coat of the hose sample and close both ends; bend the hose
sample 180° according to the bending mandrel specified in Table 11; then, soak it in
the solutions prepared in mass fractions. 20% sodium chloride, 1% sodium nitrite
and 79% distilled water respectively; heat the solution to boiling; reflux for 14 hours,
then, take out the sample; then, bend the sample 180° in the reverse direction
according to the bending mandrel specified in Table 11; carry out the air tightness
test according to the regulations in 6.5.2; check whether the test results meet the
requirements of No. 13 in Table 4.
6.6 Hose joint performance test
6.6.1 Impact resistance test
As shown in Figure 8, fasten the joints at both ends of the hose sample according to
their structure; apply the impact energy specified in Table 13; impact the center of
the joint. After the impact test, carry out the air tightness test according to the
regulations in 6.5.2, and check whether the test results meet the requirements of No.
14 in Table 4.
The impact energy is the calculated value of Formula (2).
Where.
E – impact energy, in Joules (J), 1 J = 0.102 kgf·m;
M – mass of heavy hammer, in kilograms (kg);
L – the distance from the center of the rotary axis of the heavy hammer to the center
of gravity, in meters (m);
g – gravitational acceleration, in meters per second squared (m/s2);
α – upward angle of the heavy hammer, in degrees (°).
6.6.3 Corrosion resistance test
The corrosion resistance tests of different joints are as follows.
a) Stainless steel, electroplated and other surface-treated joints
Stainless steel, electroplated and other surface-treated joints shall be subjected
to a salt spray test. Carry out the 96h test according to the salt spray test
equipment, neutral salt spray reagent and test method determined in GB/T
10125, and check whether the test results meet the requirements of No. 16 in
Table 4.
b) Copper joint
Hang the copper joint in a sealed container (volume of 18 L) containing 250
mL of ammonia water (28% by mass fraction) and 250 mL of distilled water.
The copper joint shall not be in contact with the solution. After 2 hours of
ammonia fumigation test at room temperature, check whether the test results
meet the requirements of No. 16 in Table 4.
6.7 Hose protecting coat performance test
6.7.1 Flame retardance test
As shown in Figure 9, use a Bunsen burner with an inner diameter of 10 mm to make
the flame length reach 40 mm; place the hose sample with the protecting coat
horizontally on the outer flame about 10 mm away from the upper end of the inner
flame (the flame temperature is about 800 °C); turn off the Bunsen burner after
holding for 5 s; test the continuous burning time of the hose sample; take the
arithmetic mean of 3 hose samples as the continuous burning time of the hose; check
whether the test results meet the requirements of No. 17 in Table 4.
7.1.2.2 When all the inspection items meet the requirements, judge it as qualified.
7.1.3 Sampling inspection
7.1.3.1 Sampling inspection shall be carried out batch by batch. The inspection batch
shall consist of products of the same material, produced by the same process, and of
the same specification and model, and the batch shall be the one-time delivery
quantity.
7.1.3.2 The sampling plan shall be carried out according to GB/T 2828.1, or be
determined by the manufacturer.
7.1.3.3 The inspection items shall be carried out according to Table 16.
7.1.3.4 When the inspection items meet the requirements, judge it as qualified.
7.2 Type inspection
7.2.1 Inspection conditions
In any of the following situations, type inspection shall be carried out.
a) when a new product, or an old product produced by a transfer factory, is
identified and finalized and put into mass production;
b) when the product is significantly changed in material, process, structure, etc.,
which is enough to affect the performance of the product, after formal
production;
c) when production is resumed after more than 1 year of production suspension;
d) at least once a year during normal production;
e) when there is significant difference between the exit-factory inspection results
and the last type inspection results.
7.2.2 Inspection items
The inspection items are in accordance with Table 16.
7.2.3 Determination rules
When all the inspection items meet the requirements, judge it as qualified.
7.3 Non-conformity classification of inspection items
See Table 16 for the non-conformity classification of inspection items.
8 Marking, packaging, transportation and storage
8.1 Marking
The protecting coat of the hose shall have clear and difficult-to-alter trademark,
model, standard number, hose name, corrugated tube stainless steel material
designation, manufacturer's name and production batch number; the hose joint shall
have the trademark, material designation and joint connection size (such as G1 2ൗ,
etc.).
8.2 Packaging
8.2.1 The single package of the hose shall be marked with the name of the
manufacturer, the production site, the name of the hose, and the trademark, and shall
be accompanied by a certificate of conformity and installation and use instructions.
8.2.2 The installation and use instructions shall include the hose standard number,
hose structure, usage conditions, usage methods of fasteners, installation
requirements and precautions.
8.2.3 Each set of hoses shall be packaged separately, to ensure that there is no
collision between the packaged products. The outer packaging can be fully enclosed
carton or wooden box, and the marking of the packaging box shall comply with the
regulations in GB/T 191.
8.3 Transportation
The transportation of the hose shall comply with the regulations in GB/T 9577.
8.4 Storage
The storage of the hose shall comply with the regulations in GB/T 9576.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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