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Address:No.28 Liaohe Road Economic Development Zone, Liaocheng, Shangdong, China

Contact: Pengpeng Li




CNG Cylinder

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Seamless Steel Gas Cylinder

Seamless Steel Gas Cylinder

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

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.

Material reinspection

making mark recording according to the year and sequence of the materials accepted by the stock-keeper

Marking must be made in paints on the rim of both ends of blank tube for any tubes   

Material reinspection

Outer surface inspection

Acceptance certificate that confirmed by quality control department of manufacturer of the material must be attached with incoming materials.

The deviation of wall thickness of tube should not exceed 25% of the min. Wall thickness.

The reinspection of compositions of the tubes

About 20g sample for chemical analysis should be made by mechnical cutting without oil contamination and other foreign matters.

For the purposes of this International Standard the following definitions apply.

 yield stress

value corresponding to the 0,2 % proof stress, Rp 0,2


hardening heat treatment in which a tube, which has been heated to a uniform temperature above the upper critical point Ac3 of the steel, is cooled rapidly in a suitable medium


Evaluation of conformity is required to be performed in accordance with the relevant regulations of the country (ies) where the tubes are to be used. In order to ensure that tubes are in compliance with this International Standard they shall be subject to inspection in accordance with clauses 9 and 10 by an authorized inspection body  (hereafter referred to as “the inspector ”) recognized in the countries of use. The inspector shall be competent for inspection of tubes.

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