Testing and Inspection of Old Tanks

there is visible permanent deformation.The test pressure shall be applied for not less than 15 minutes. Pressure decay shallnot exceed 0.1kPa per minute.Any evidence of leakage or loss of pressure shall be investigated, identified andrecorded.7.6.3.8 Alternatives to hydraulic testingNOTE:RID / ADR Chapters 6.8.2.4.2 requires a hydraulic pressure test to be carried atperiodic examinations but this is qualified by a footnote which states:“In special cases and with the agreement of the expert approved by the competentauthority, the hydraulic pressure test may be replaced by a pressure test usinganother liquid or gas, where such an operation does not present any danger.”The hydraulic pressure test may be replaced by an equivalent method based on Non-Invasive Inspection (NII) accredited by UKASNon Invasive Inspection (NII) is an assessment regime that may use a combination ofNon-Destructive Testing (NDT) techniques such as ultrasonics, acoustic emission,radiography, dye penetrant, magnetic particle, electromagnetic, leaking testing or othersuitable non-destructive test method.Suitable methods may be found in Table 9 below:Table 9 - Standards for NDTStandardApplicationEN 444EN 1435EN 1714EN 1290radiographic techniquesradiographic techniquesultrasonic techniquesmagnetic particle techniquesWhere an inspection body intends to undertake a pressure test with a substance otherthan water then the following shall apply: a detailed procedure, based on theprocedure with water above, including a risk assessment taking account that it will notpresent any danger shall be prepared the procedure shall be accredited by UKAS andincluded in the schedule of the inspection body.The requirements of EN12972 Annex C shall be complied with if pressure testing withgas. The procedure and supporting training shall take account of the differingconditions found at the site.20