Stainless steel corrugated tubes for the connection of gas appliances
1 Scope
This document specifies the classification, specifications and models, materials, appearance, structure and dimensions, performance requirements, test methods, inspection rules, marking and installation instructions, packaging, transportation and storage of stainless steel corrugated tubes for the connection of gas appliances.
This document is applicable to stainless steel corrugated tubes for the connection of gas appliances or gas equipment and whose conveying medium is town gas, nominal dimension is not greater than DN32, maximum working pressure is 0.01 MPa.
This document is not applicable to stainless steel corrugated tubes for the connection of gas appliances with dimethyl ether in the conveying medium.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions 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 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 4240 Stainless steel wires
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 15065 Black polyethylene compounds for wire and cable
GB/T 23658 Elastomeric seals - Material requirement for seals used in pipes and fittings carrying gaseous fuels and hydricarbon fluid
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
stainless steel corrugated tubes for the connection of gas appliances
stainless steel corrugated tubes with connectors at both ends and of fixed length and protecting coat
Note: Referred to as "corrugated tubes".
3.2
tubular blank
a longitudinally welded or seamless stainless steel tube for making corrugated tube
3.3
corrugated tube
tubular shell with bus bar is corrugated
3.4
protecting coat
coat for protecting stainless steel corrugated tube
4 Classification, specification and model
4.1 Classification
4.1.1 According to the connection characteristics, the corrugated tubes are classified as follows:
a) Ordinary corrugated tubes: used only to connect gas pipelines to stationary gas appliances or gas equipment, code RLB;
b) Ultra-flexible corrugated tubes: can be used to connect gas pipelines or bottled LPG regulators to gas appliances or gas equipment, code CRLB.
4.1.2 According to the purposes, the corrugated tubes are classified as follows:
a) Corrugated tubes for gas meter connection: code B;
b) Corrugated tubes for the connection of gas appliances or gas equipment other than gas meters: code A.
4.1.3 According to the corrugated shape, the corrugated tubes are classified as follows:
a) Spiral corrugated tubes: the corrugated shape is spiral, code L;
b) Annular corrugated tubes: the corrugated shape is closed circular ring, code H.
Contents
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Classification, specification and model
4.1 Classification
4.2 Specification
4.3 Model
5 Materials, appearance, structure and dimensions
5.1 Materials
5.2 Appearance
5.3 Structure and dimensions
6 Performance requirements
7 Test methods
7.1 Test conditions
7.2 Test apparatus
7.3 Performance test of corrugated tube
7.4 Performance test of protecting coat
7.5 Performance test of joint
7.6 Gas resistance test of sealing gasket
8 Inspection rules
8.1 Delivery inspection
8.2 Type inspection
9 Marking and installation instructions
9.1 Marking
9.2 Installation instructions
10 Packaging, transportation and storage
10.1 Packaging
10.2 Transportation
10.3 Storage
