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GB/T 41494-2022 (GB/T41494-2022)

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GB/T 41494-2022: PDF in English (GBT 41494-2022)

GB/T 41494-2022
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 91.140
CCS P 42
Aluminum Alloy Lining Plastics Pipes and Fittings
ISSUED ON: APRIL 15, 2022
IMPLEMENTED ON: NOVEMBER 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, Definitions, Symbols and Abbreviations ... 5
4 Materials and Construction ... 7
5 Classification of Products ... 10
6 Service Conditions ... 11
7 Requirements ... 11
8 Test Methods ... 19
9 Inspection Rules ... 21
10 Marking, Packaging, Transportation and Storage ... 24
Aluminum Alloy Lining Plastics Pipes and Fittings
1 Scope
This Document specifies the material and structure, product classification, service conditions,
requirements, test methods, inspection rules, marking, packaging, transportation and storage of
aluminum alloy lining plastics pipes and fittings.
This Document is applicable to aluminum alloy lining plastics piping systems for drinking
water, domestic hot water, heating hot water, and air-conditioning circulating water; aluminum
alloy lining plastics piping systems for indoor gas transportation. Considering under the
conditions of the chemical resistance and heat resistance of the materials, it can be used for
aluminum alloy lining plastics piping system for various chemical fluid and gas transportation.
2 Normative References
The provisions in following documents become the essential provisions of this Document
through reference in this Document. For the dated documents, only the versions with the dates
indicated are applicable to this Document; for the undated documents, only the latest version
(including all the amendments) is applicable to this Document.
GB/T 2828.1-2012 Sampling Procedures for Inspection by Attribute - Part1: Sampling
Schemes Indexed by Acceptance Quality Limit (AQL) For Lot-by-Lot Inspection
GB/T 2918 Plastics - Standard Atmospheres for Conditioning and Testing
GB/T 3190 Wrought aluminum and aluminum alloy - Chemical composition
GB/T 3682.1 Plastics – Determination of the Melt Mass-Flow Rate (MFR) and Melt
Volume-Flow Rate (MVR) of Thermoplastics - Part 1: Standard Method
GB/T 4436 Wrought Aluminum and Aluminum Alloy Tubes― Dimensions and
Deviations
GB/T 4437.1 Aluminum and Aluminum Alloy Extruded Tubes― Part 1: Seamless Tubes
GB/T 6111 Thermoplastics Piping Systems for the Conveyance of Fluids—Determination
of the Resistance to Internal Pressure
GB/T 7307 Pipe Threads with 55 Degree Thread Angle where Pressure-Tight Joints are
not Made on the Threads
GB/T 8013.1 Anodic Oxide Coatings and Organic Polymer Coatings on Aluminum and its
Alloys - Part 1: Anodic Oxide Coatings
GB/T 8806 Plastics Piping Systems - Plastics Components – Determination of Dimensions
GB/T 10798 Table of Universal Wall Thickness of Thermoplastics Pipe
GB/T 15558.1 Buried Polyethylene (PE) Piping Systems for the Supply of Gaseous Fuels
- Part 1: Pipes
GB/T 17219 Standard for Hygienic Safety Evaluation of Equipment and Protective
Materials in Drinking Water
GB/T 18742.2 Polypropylene (PP) Piping Systems for Hot and Cold Water Installations -
Part 2: Pipes
GB/T 18991 Thermoplastics Pipes and Fittings for Hot and Cold Water Systems
GB/T 19466.6 Plastics - Differential Scanning Calorimetry (DSC) - Part 6: Determination
of Oxidation Induction Time (isothermal OIT) and Oxidation Induction Temperature
(Dynamic OIT)
GB/T 19473.2 Polybutene (PB) Piping Systems for Hot and Cold Water Installations - Part
2: Pipes
GB/T 28799.2 Polyethylene of Raised Temperature Resistance (PE-RT) Piping Systems
for Hot and Cold Water Installations - Part 2: Pipes
3 Terms, Definitions, Symbols and Abbreviations
3.1 Terms and Definitions
For the purposes of this Document, the following terms and definitions apply.
3.1.1 Aluminum alloy lining plastic pipe
The pipe with the outside pipe of an aluminum alloy tube, and the inside pipe of a thermoplastic
(PP-R, PB, PE-RT, PE) pipe, and is prestressed and compounded to form a two-layer structure.
3.1.2 Outside pipe
The outer structure of the aluminum alloy lining plastic pipe, which is a seamless aluminum
alloy round-pipe formed by hot extrusion.
3.1.3 Inside pipe
L1: Minimum socket depth of hot-melt socket fitting;
L2: Minimum insertion depth of hot-melt socket fitting;
L3: Tubular length of the fusing section of the hot-melt butt fitting socket;
L4: The cutback length of the fusing section of the hot-melt butt fitting socket;
L5: The socket depth of electrofusion connection fitting;
L6: The length of the fusing zone of the electrofusion connection fitting;
S: Pipe series;
TD: Design temperature;
Tmal: Malfunction temperature;
Tmax: Maximum design temperature.
3.2.2 Abbreviations
MFR: Melt Mass-Flow Rate;
PB: Polybutylene;
PE: Polyethylene;
PE-RT: Polyethylene of Raised Temperature Resistance;
PP-R: Polypropylene Random Copolymer;
SDR: Standard Dimension Ratio.
4 Materials and Construction
4.1 Material of pipe
4.1.1 Take the wrought aluminum alloy as the material of outside pipe; its chemical composition
shall comply with the provisions of GB/T 3190; and its mechanical properties shall comply
with the provisions of GB/T 4437.1.
4.1.2 When the inside pipe is a polypropylene random copolymer (PP-R) pipe, the material
properties of the inside pipe raw material shall comply with the provisions of GB/T 18742.2.
4.1.3 When the inside pipe is a polybutene (PB) pipe, the material properties of the inside pipe
raw material shall comply with the provisions of GB/T 19473.2.
8.3.1.4 Thickness of anodic oxide film and outer plastic coating
The thickness of the anodic oxide film is measured in accordance with the provisions of GB/T
8013.1; and the thickness of the outer plastic coating is measured by a measuring tool with an
accuracy of no less than 0.02mm.
8.3.2 Fitting
8.3.2.1 Minimum diameter
Measure in accordance with the provisions of GB/T 8806.
8.3.2.2 Wall thickness
Measure in accordance with the provisions of GB/T 8806.
8.3.2.3 Depth of fusing socket of fitting
According to the provisions of GB/T 8806, use a measuring tool with an accuracy of no less
than 0.02mm to measure.
8.3.2.4 Average inner diameter
Measure in accordance with the provisions of GB/T 8806.
8.3.2.5 Average outer diameter
Measure in accordance with the provisions of GB/T 8806.
8.3.2.6 Tubular length and cutback length of butt fitting
In accordance with the provisions of GB/T 8806, use a measuring tool with an accuracy of no
less than 1mm to measure.
8.3.2.7 Non-roundness
Measure in accordance with the provisions of GB/T 8806.
8.4 Hydrostatic test
Carry out the test in accordance with the provisions of GB/T 6111, use the A-typed head.
8.5 Thermal stability test under hydrostatic state
8.5.1 Test conditions
Test according to the provisions of Tables 7, 8 and 9 respectively, and the allowable temperature
deviation is 110+4 -2 °C. Test medium: water inside and air outside.
8.5.2 Test method
Carry out the test in accordance with the provisions of GB/T 6111, using the A-type head.
8.6 Melt mass flow rate
Carry out the test in accordance with the provisions of GB/T 3682.1.
8.7 Oxidation induction time
Carry out the test in accordance with the provisions of GB/T 19466.6.
8.8 Hygienic performance test
Carry out the test in accordance with the provisions of GB/T 17219.
8.9 Internal pressure test
Carry out the test in accordance with the provisions of GB/T 6111.
8.10 Hot and cold cycle test
Carry out the test in accordance with the provisions of GB/T 18991.
9 Inspection Rules
9.1 Inspection classification
Inspection is divided into stereotype inspection, exit-factory inspection and type inspection.
9.2 Batching and grouping
9.2.1 Pipe
The same batch of raw materials and pipes continuously produced with the same specification
shall be regarded as a batch; and the quantity of each batch shall not exceed 150t. When the
production of 7d is less than 150t, the output of 7d is regarded as a batch.
9.2.2 Fitting
Fittings that are produced continuously with the same batch of raw materials, the same
production process and the same specification are regarded as a batch. The quantity of each
batch shall not exceed 10,000 pieces; when the production of 7d is still insufficient for a batch,
the production of 7d shall be regarded as a batch.
9.2.3 Grouping
9.6 Judgment rules
Appearance and dimensions in Clause 7 are determined according to Table 15. If there is one
unqualified hygienic requirement, it shall be judged as unqualified batch (or product). If one of
the other requirements fails to comply with the provisions, double quantities of samples shall
be randomly selected for reinspection. If it is still unqualified, it shall be judged as an
unqualified batch (or product).
10 Marking, Packaging, Transportation and Storage
10.1 Marking
10.1.1 Marking of pipe
There shall be a complete and permanent marking on each pipe, and the distance between the
markings shall be no greater than 2m. The pipe marking shall contain at least the following:
a) Trademark or manufacturer's name;
b) Product name and specification;
c) This document number;
d) Production date or production batch number.
For pipeline systems for gas transmission, the words "Ranqi (Pinyin)" and "GAS" shall be
marked.
10.1.2 Marking of fitting
There shall be complete and permanent marking on each fitting. The fitting markings shall at
least contain the following:
a) Trademarks;
b) Name of raw material;
c) Product specification, indicate the pipe series (S).
For pipeline systems used for gas transmission, the name and grade of raw materials shall be
marked.
10.2 Packaging
10.2.1 The pipes shall be packed, bundled and sealed according to the same specifications, and
can also be negotiated according to user requirements. The pipe packaging shall at least contain
......
 
(Above excerpt was released on 2022-08-21, modified on 2022-08-21, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT41494-2022