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Section 7-2 Copper and Copper Alloy Tubes
711. Application
The requirements in this Section apply to the tests and inspection for the approval of manufacturing process of copper and copper alloy tubes as specified in Pt 2, Ch 1, 701. of the Rules.
712. Data to be submitted
The following reference data in addition to those specified in 102. are to be submitted to the Society.
(1) Kind of copper and copper alloy tubes (each material grade)
(2) General description on the manufacturing facilities of raw materials (including the capacity of moulding, melting, casting facilities and furnace, etc.) and the reference data by which it can be assured how the material is produced.
(3) Method of manufacture (reheating of billet, heat treatment, finishing, etc)
(4) General description on the testing and inspection facilities (various testing and inspection equip- ments and installations)
(5) Repair and NDT procedures (if any)
713. Approval tests
1. Selection of test samples
(1) The test samples used for the approval test are to be selected, in the presence of the Surveyor,
as a rule, from the copper and copper alloy facturing process, fabrication method of tubes
(2) As a rule, the dimensions of the test sample
tubes with the same conditions of material manu- and heat treatment method.
are standardized according to the maximum manu-
factured outer diameter and 1/2 of this value. Furthermore, the number of test pieces is to be as deemed appropriate by the Society.
2. Approval tests
(1) Approval tests specified in Table 2.7.2 are to be carried out, in the presence of the Surveyor unless otherwise specified by the Society.
(2) Testing method and acceptance criteria are to be in accordance with the Table 2.7.3. Where it
is difficult to comply with test methods and evaluation criteria specified in this Section, the de- cision may apply to standards authorized by the Society. (officially recognized establishment).
32 Guidance for Approval of Manufacturing Process and Type Approval, Etc. 2015
Ch 2 Approval of Manufacturing Process Ch 2, Sec 7-2
Table 2.7.2 Approval Test Items for copper and copper alloy tubes
Grade | Approval test items | |||||||||
Chemical analysis | Tensile test | Elongation | Hardness test | Grain size | Flairing test(1) | Flattening test(2) | NDT(3) | Hydrogen embrittle ment test | Season cracking | |
C1201 | O | O | O | O | O | O | O | O | O | |
C1220 | O | O | O | O | O | O | O | O | ||
C2600 | O | O | O | O | O | O | O | O(4) | O | |
C2700 | O | O | O | O | O | O | O | O(4) | O | |
C2800 | O | O | O | O | O | O(4) | O | |||
C4430 | O | O | O | O | O | O | O(4) | O | ||
C6870 | O | O | O | O | O | O | O(4) | O | ||
C6871 | O | O | O | O | O | O | O(4) | O | ||
C6872 | O | O | O | O | O | O | O(4) | O | ||
C7060 | O | O | O | O | O | O | O(4) | |||
C7100 | O | O | O | O | O | O | O(4) | |||
C7150 | O | O | O | O | O | O | O(4) | |||
Notes: 1. In case where not more than 100mm in outside diameter. 2. In case where more than 100mm in outside diameter. 3. Eddy current test is to be applied. However, hydrostatic or pneumatic test can be applied if agreed by the Surveyor. 4. In case where not more than 50mm in outside diameter. |
Guidance for Approval of Manufacturing Process and Type Approval, Etc. 2015 33
Ch 2 Approval of Manufacturing Process Ch 2, Sec 7-2
Grade | Outside diameter of tube end | |
D ≤ 20mm | 20 < D ≤ 100mm | |
C1201, C1220 | 1.4 × D | 1.3 × D |
C2600, C2700, C2800 | 1.2 × D | 1.15 × D |
C4430, C6870, C6871, C6872, C7060, C7100, C7150 | 1.25 × D |
Table 2.7.3 Approval Testing Method and Acceptance Criteria for copper and copper alloy tubes
Approval test items | Approval testing method | Acceptance criteria |
Chemical analysis | Chemical analysis is to be carried out in accordance with the standards authorized by the Society (officially recognized es- tablishment). | To meet the requirements in KS D 5301 or equivalent |
Tensile test | In accordance with Pt 2, Ch 1 of the Rules. | To meet the requirements in Pt 2, Ch 1, Sec 7 of the Rules. |
Elongation | In accordance with Pt 2, Ch 1 of the Rules. | To meet the requirements in Pt 2, Ch 1, Sec 7 of the Rules. |
Hardness test | In accordance with KS B 0806 or equivalent. Hardness to be measured on the inner face of tube. | To meet the requirements in KS D 5301 or equivalent |
grain size | In accordance with KS D 0202 or equivalent. Grain size to be measured on the longitudinal section of tube. | To meet the requirements in KS D 5301 or equivalent |
Flaring test | In accordance with Pt 2, Ch 1, 401. of the Rules. The outside diameter of tube end after flaring is to comply with the re- quirement specified in bellow table. | To be free of surface crack. |
Flattening test | In accordance with Pt 2, Ch 1, 401. Distance between flat- tening plates is to be 3 times of tube thickness. | To be free of surface crack. |
Eddy current test | In accordance with KS D 0214 or equivalent. Test can be performed prior to heat treatment. Dimension of reference de- fect (diameter of drilled hole) is to comply with the require- ments in KS D 5301 or equivalent. | To be free of harmful defects. |
hydrostatic test | In accordance with Pt 2, Ch 1, 401. Permissible pressure of material, S is to comply with the requirement specified in bel- low table. | To be free of leakages. |
Approval test items | Approval Testing method | acceptance criteria |
pneumatic test | Pneumatic test is to be carried out with the air pressure of 0.4 MPa, maintained in the water for 5sec. | To be free of leakages. |
Hydrogen embrittlem ent test | In accordance with KS D ISO 2626. Heat the test piece in a furnace with an hydrogen atmosphere, maintained at a temper- ature 850±25℃ for a period of 30 min. Polish the section, etch if desired, and examine under a microscope at magnifica- tion of 75~200 X. | There is no evidence of gassing or open grain structure characteristic of embrittlement. |
season cracking | In accordance with KS D 5301 or equivalent. | To be free of surface crack. |
Grade | S (N mm ) |
C1201, C1220 | 41 |
C2600, C2700, C2800, C4430, C6870, C6871, C6872, C7060, C7100, C7150 | 48 |
34 Guidance for Approval of Manufacturing Process and Type Approval, Etc. 2015
Ch 2 Approval of Manufacturing Process Ch 2, Sec 7-2
714. Dealings after approval
Copper and copper alloy tubes which conform to the requirements in this Section are to be dealt
with as [in approval case] in the requirements in erwise specified by the Society.
Pt 2, Ch 1, 201. 3 (2) of the Rules, unless oth-
Guidance for Approval of Manufacturing Process and Type Approval, Etc. 2015 35
Ch 2 Approval of Manufacturing Process Ch 2, Sec 8