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Luxi New Energy Equipment Group Co.,Ltd

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

Contact: Pengpeng Li

Tel:86-635-8510990

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Email:lipengpeng@lxhg.com

CNG Cylinder

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Long Tube Cylinder

Long Tube 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

 quenching

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

 tempering


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.


TESTING

The hydraulic pressure in the tube shall be increased at a controlled rate until the test pressure, ph, is reached with a tolerance of %. The test is normally carried out using water. All necessary precautions shall be taken to guarantee the safety of persons and property. The tube test pressure shall be held for a sufficiently long period (at least 2 min) to ascertain that there is no tendency for the pressure to decrease or for permanent visible deformation and that the tube does not leak. The test mounting shall be so designed and arranged as to permit easy checking of the tube tightness. It shall be fitted with calibrated pressure gauge(s). Any internal pressure applied to the tube after heat treatment and before the official pressure test shall not exceed 90 % of the test pressure, ph. After testing the interior of the tube shall be dried to avoid oxidation


Volumetric expansion test

The hydraulic pressure in the tube shall be increased at a controlled rate until the test pressure, ph, is reached with a tolerance of %. The test is normally carried out using water. The tube test pressure shall be held for a sufficiently long period to ensure complete expansion of the tube, and in no case shall the pressure be held for less than 2 min. The total volumetric expansion shall be measured. The pressure shall then be released and the volumetric expansion remeasured. The tube shall be rejected if it shows permanent expansion (i.e. volumetric expansion after the pressure has been released) in excess of 10 % of the total volumetric expansion measured at the test pressure, ph. The total and permanent expansion reading shall be recorded, together with the corresponding serial number of the tube tested so that the elastic expansion (i.e. total expansion minus permanent expansion), can be established for each tube. The test apparatus shall be fitted with at least two calibrated pressure gauges arranged in a parallel configuration to check the accuracy of the pressure applied to the tube. Any internal pressure applied to the tube after heat treatment and before the official pressure test shall not exceed 90 % of the test pressure, ph. After testing, the interior of the tube shall be dried to avoid oxidation.



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