GB/T 41317-2022 English PDF (GBT41317-2022)

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GB/T 41317-2022: Stainless steel corrugated tubes for the connection of gas appliances
GB/T 41317-2022
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 ...