GB/T 17791-2017 English PDF (GBT17791-2017)

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GB/T 17791-2017: Seamless copper and copper alloys tube for air conditioner and refrigeration equipment
GB/T 17791-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS77.150.30
H 62
Replacing GB/T 17791-2007
Seamless copper and copper alloys tube for air
conditioner and refrigeration equipment
ISSUED ON: JULY 12, 2017
IMPLEMENTED ON: FEBRUARY 01, 2018
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Requirements ... 5 
4 Test method ... 10 
5 Inspection rules ... 11 
6 Marking, packaging, transportation, storage and quality certificate ... 14 
7 The content of the purchase order (or contract) ... 15 
Appendix A (Normative) Method for determination of residue (total) on the inner
surface of copper tube ... 17 
Appendix B (Informative) Determination method of oil content on inner surface
of copper tube ... 20 
Appendix C (Informative) Method for determination of inner surface moisture of
copper tube ... 22 
Appendix D (Informative) Determination method of chloride ion (Cl-) on the inner
surface of copper tube ... 24 
Appendix E (Informative) Analysis method of paraffin wax on inner surface of
copper tube ... 26 
Seamless copper and copper alloys tube for air
conditioner and refrigeration equipment
1 Scope
This standard specifies the requirements, test methods, inspection rules,
packaging, marking, transportation, storage, quality certificates and purchase
orders (or contracts) of seamless copper and copper alloys tube for air
conditioner and refrigeration equipment.
This standard applies to seamless copper and copper alloys tube (hereinafter
referred to as tubes) for household air conditioners, refrigerators (freezers),
small and medium-sized central air conditioners, refrigeration equipment.
2 Normative references
The following documents are essential to the application of 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) are applicable to this standard.
GB/T 228.1-2010 Metallic materials - Tensile testing - Part 1: Method of test
at room temperature
GB/T 242 Metal materials - Tube - Drift-expending test
GB/T 246 Metal materials - Tube - Flattening test
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 5121 (all parts) Copper and copper alloy - Chemical analysis methods
GB/T 5231 Designation and chemical composition of wrought copper and
copper alloys
GB/T 5248-2016 Electromagnetic (eddy-current) examination of copper and
copper alloy seamless tube
GB/T 8888 Wrought heavy non-ferrous metal products - Packing, marking,
transportation, storing and certificate of quality
GB/T 23606 Copper - Hydrogen embrittlement test method
The flattening test of the tube is carried out according to the requirements of
GB/T 246.
4.6 Eddy current flaw testing
The eddy current flaw testing of the tube shall be carried out in accordance with
the provisions of GB/T 5248.
4.7 Grain size
The grain size inspection of the tube shall be carried out according to the
requirements of YS/T 347.
4.8 Hydrogen embrittlement test
The hydrogen embrittlement test of the tube is carried out according to the
closed bending method in GB/T 23606. The repeated bending method in GB/T
23606 is used for arbitration; the number of bending is at least 6 times.
4.9 Cleanliness
The inspection of internal surface residues (total) of tubes with an outer
diameter of ≤ 30 mm shall be carried out in accordance with Appendix A. The
test method for internal surface residues (total) of tubes with an outer diameter
of > 30 mm shall be carried out by the method agreed between the supplier and
the buyer. The inspection of oil, moisture, chloride ion (Cl-), paraffin can be
carried out according to the provisions of Appendix B, Appendix C, Appendix D,
Appendix E, or according to the test method agreed by the supplier and the
buyer.
4.10 Surface quality
Visually inspect the surface quality of the tube.
5 Inspection rules
5.1 Inspection and acceptance
5.1.1 The product shall be inspected by the supplier, to ensure that the product
quality meets the requirements of this standard and the purchase order (or
contract). Meanwhile it shall fill in the quality certificate.
5.1.2 The purchaser shall inspect the products received in accordance with the
provisions of this standard. When the inspection result is inconsistent with the
provisions of this standard and the purchase order (or contract), it shall be
submitted to the supplier in written form; the supplier and the buyer shall
negotiate and resolve. Objections related to surface quality and dimensional
h) Net weight;
i) Copper tubes for refrigerators (if they are copper tubes for refrigerators,
they must be marked);
j) Implemented standards;
k) Production license number and QS identifier;
l) Others.
6.1.2 Packaging box marking
The packaging box mark of the tube shall comply with the requirements of GB/T
8888.
6.2 Packaging
6.2.1 The packaging of tubes shall meet the requirements of GB/T 8888. The
coil shall be sealed after being filled with protective gas.
6.2.2 When there are special requirements for packaging, the supplier and the
buyer shall negotiate and determine it.
6.3 Transport, storage and quality certificate
The transport, storage and quality certificate of the tube shall meet the
requirements of GB/T 8888.
7 The content of the purchase order (or contract)
The purchase order (or contract) of the materials listed in this standard shall
include the following:
a) Material name;
b) Alloy designation;
c) Status;
d) Size (diameter, wall thickness or other size requirements of the tube);
e) Delivery shape;
f) Weight;
g) Flattening test (when required);
Appendix A
(Normative)
Method for determination of residue (total) on the inner surface of
copper tube
A.1 Scope
This Appendix specifies the determination method for the internal surface
residue (total) of copper tubes.
This Appendix is applicable to the determination of non-volatile oil and solid
residues remaining on the inner surface of copper tubes which have an outer
diameter ≤ 30 mm.
A.2 Method summary
Clean the inner surface of the copper tube by the use of organic solvents such
as carbon tetrachloride; extract the residue on the inner surface of the tube into
the solvent. After the organic solvent is heated and evaporated in the beaker,
the increase in the mass of the beaker is the residue in the tube.
A.3 Instruments and reagents
A.3.1 Ultrasonic oscillator: The power is not less than 2 kW; effective volume is
not less than 70 L.
A.3.2 Analytical balance (graduation value 0.1 mg).
A.3.3 Solvent (analytical pure carbon tetrachloride or trichloroethylene).
A.4 Test procedure
A.4.1 Clean the beaker. Dry it in an oven at 105 °C ± 5 °C for 60 minutes. Take
it out and put it in a desiccator. Weigh it for use after 60 minutes.
A.4.2 Cut the specimen: When the inner diameter of the tube is ≥ 5 mm, the
length of the sample is 1.5 m. When the inner diameter of the tube is less than
5 mm, the length of the sample is 2 m. Use a tube cutter for cutting to avoid
copper chip...