ISO 9809-1:2019 pdf free
ISO 9809-1:2019 pdf free.Gas cylinders一Design, construction and testing of refillable seamless steel gas cylinders and tubes
In the event of failure to meet the test requirements, retesting or reheat treatment and retesting shall be carried out as follows to the satisfaction of the inspector.
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 cylinders implicated by the failure to only one further heat treatment, e.g. if the failure is in a test representing the prototype or batch cylinders. Test failure shall require reheat treatment of all the represented cylinders prior to retesting.
This reheat treatment shall consist of either re-tempering or complete reheat treatment.Whenever cylinders are reheat treated, the minimum guaranteed wall thickness shall be maintained.
Only the relevant prototype or 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 cylinders of the batch shall be rejected.
2) If the failure is due to a cause other than the heat treatment applied, all cylinders with imperfections shall be either rejected or repaired such that the repaired cylinders pass the test(s) required for the repair. They shall then be re-instated as part of the original batch.
Where there is no risk of hydrogen embritlement, the maximum value of the tensile strength is limited by the ability of the steel to meet the requirements of Clauses 9 and 10, but the maximum actual tensile strength, Rma, shall always be less than 1100 MPa for chrome-molybdenum steels and in no case exceed 1 030 MPa for carbon manganese steels.ISO 9809-1 pdf free download.
