ISO 6406:2005 pdf free.Gas cylinders一Seamless steel gas cylinders一Periodic inspection and testing.
It is recommended that the procedures a) to l) be performed in the sequence listed. In particular, the check of internal condition [d)] should be carried out before the pressure test or before the ultrasonic examination [g)].
Cylinders that fail an inspection or test shall be rejected (see Clause 16). Where a cylinder passes the abovelisted procedures but the condition of the cylinder remains in doubt, additional tests shall be performed to confirm its suitability for continued service (see Clause 9) or the cylinder shall be rendered unserviceable.
Depending on the reason for rejection, some cylinders may be recovered (see Annex B).
The inspections and tests shall be carried out only by persons who are competent in the subject and
authorized under the relevant regulations.
Mechanical properties of steel cylinders may be affected by heat exposure. Therefore, the maximum
temperature for any operation shall be limited in accordance with the manufacturer’s recommendation.
Before any work is carried out, the relevant cylinder data and its contents and ownership shall be identified (e.g. from the labelling and stamping, see ISO 13769). Cylinders with incorrect or illegible markings or unknown gas contents shall be set aside for special handling.
If the contents are identified as hydrogen or other embritling gas, only those cylinders manufactured or qualified as hydrogen cylinders shall be used for that service. It shall be checked that the cylinder is compatible for hydrogen service, i.e. with respect to the maximum tensile strength and internal surface condition. Cylinders in accordance with ISO 13769 are stamped“H”.
AIlI other cylinders shall be withdrawn from hydrogen service and their suitability for their new, intended service checked (see ISo 11621).
When necessary, the cylinder shall be cleaned and have all loose coatings, corrosion products, tar, oil or other foreign matter removed from its external surface by a suitable method, e.g. by brushing, shot-blasting (under closely controlled conditions), water jet abrasive cleaning, chemical cleaning or other suitable methods. The method used to clean the cylinder shall be a validated, controlled process. Care shall be taken at all times to avoid damaging the cylinder or removing excess amounts of cylinder wall (see Annex B).
If fused nylon, polyethylene or a similar coating has been applied and the coating is seen to be damaged or it prevents proper inspection, then the coating shall be stripped. If the coating has been removed by the application of heat, in no case shall the temperature of the cylinder have exceeded 300 °C.Precautions shall be taken to ensure that the method of ilumination presents no risks to the tester while performing the operation. Any internal liner or coating that may obstruct optimum internal visual inspection shall be removed. Any cylinder showing presence of foreign matter or signs of more than light surface corrosion shall be cleaned internally under closely controlled conditions by shot-blasting, water jet abrasive cleaning, flailing, steam jet, hot water jet, rumbling, chemical cleaning or other suitable method. The method used to clean the cylinder shall be a validated, controlled process. Care shall be taken at all times to avoid damaging the cylinder or removing excess amounts of cylinder wall (see Annex B). If cleaning is required, the cylinder shall be re-inspected after the cleaning operation.ISO 6406 pdf download.