Iranian Classification Society Rules

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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

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Ch 2 Approval of Manufacturing Process Ch 2, Sec 7-2

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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

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Ch 2 Approval of Manufacturing Process Ch 2, Sec 7-2

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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

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Ch 2 Approval of Manufacturing Process Ch 2, Sec 7-2

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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-


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Ch 2 Approval of Manufacturing Process Ch 2, Sec 8

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