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CNG Cylinder

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A Very Long Conducting Tube Hollow Cylinder

A Very Long Conducting Tube Hollow Cylinder

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Product Details


 

Gas cylinders —Refillable seamless steel tubes for compressed gas transport, of water capacity between 150 land 3000 l — Design, construction and testing

 

Members of ISO and IEC maintain registers of currently valid International Standards.

ISO 148, Steel — Charpy impact test (V-notch).

ISO 6506, Metallic materials — Hardness test — Brinell test.

ISO 6892, Metallic materials — Tensile testing at ambient temperature.

ISO 11114-1, Transportable gas cylinders — Compatibility of cylinder and valve materials with gas contents — Part 1: Metallic materials.

ISO 11484, Steel tubes for pressure purposes — Qualification and certification of non-destructive testing (NDT) personnel.

 

Materials

 The tempering temperature shall be defined within ± 30 °C of the temperature for guaranteeing specified mechanical properties but shall not be less than 540 °C.

 

Failure to meet test requirements

In the event of failure to meet test requirements, retesting or reheat treatment and retesting shall be carried out as follows:

a) If there is evidence of a fault in carrying out a test, or an error of measurement, a further test shall be performed. If the result of this test is satisfactory, the first test shall be ignored.

b) If the test has been carried out in a satisfactory manner, the cause of test failure shall be identified.

1) If the failure is considered to be due to the heat treatment applied, the manufacturer may subject all the tubes of the batch to a further heat treatment.

2) If the failure is not due to the heat treatment applied, all the identified defective tubes shall be rejected or repaired by an approved method. The non-rejected and repaired tubes are then considered as a new batch. In both cases the new batch shall be tested by the inspector. All the relevant batch tests needed to prove the acceptability of the new batch shall be performed again. If one or more tests prove even partially unsatisfactory, all the tubes of the batch shall be rejected.

 Where reheat-treatment is required, the tubes shall be retempered or requenched and tempered. A maximum of two reaustenitizing treatments is permitted. Whenever tubes are reheat-treated the wall thickness can be affected by scale formation, therefore the minimum design wall thickness shall be checked in the finished tube

 

Impact testing

Except for the requirements set out below, the test shall be carried out in accordance with ISO 148.

The test shall be carried out on three test pieces taken longitudinally from the sample ring wall. The notch shall be perpendicular to the face of the sample ring wall. The test pieces shall be machined on all six faces. If the wall thickness does not permit a final test piece width of 10 mm, the width shall be as near as practicable to the nominal thickness of the tube wall. If the wall thickness is greater than 10 mm, the test pieces shall be taken as near as practicable to the inner surface of the sample ring and their thickness limited to 10 mm.

 

Batch tests

The impact test shall be conducted at a temperature of – 20 °C and the impact test values shall meet the following requirements:

— individual values W 40 J/cm2;

— mean value W 50 J/cm2.

If agreed between the manufacturer and purchaser, impact tests at lower temperatures may be carried out according to the condition of use provided that the foregoing test requirements are also satisfied.

 


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