Luxi New Energy Equipment Group Co.,Ltd
Address:No.28 Liaohe Road Economic Development Zone, Liaocheng, Shangdong, China
Contact: Pengpeng Li
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Gas cylinders —Refillable seamless steel tubes for compressed gas transport, of water capacity between 150 land 3000 l — Design, construction and testing
The test shall be carried out in accordance with ISO 6892 on a cylindrical proportional test piece taken longitudinally (along the axis of the ring) in the ring wall and machined. The gauge length of the test piece L0 shall be equal to 5,65 The results of the tensile test shall be at least equal to the minimum guaranteed values of the properties, and in all cases:
— Rm shall not exceed 1 100 MPa;
— the elongation after fracture shall be not less than 14 %;
— the ratio Rea/Rm shall be not more than 0,95.
NOTE Additional requirements related to tubes for use with embrittling gases are given in clause 11.
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.
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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