We receive "requests for temporary approval" from various ships who weld pipe patches on various piping systems with through-wall leaks. We disposition each request on a case by case basis. We do not know of any industry standard for pipe patch geometry, weld joint design (I am referring to simple lap patch), or special NDT requirements. Does anyone know if such a standard exists? We would like to provide the fleet with some info on how to properly affix such welded patches before they come to us with requests to approve patches that are too small, incorrect geometry, improperly NDT'd, etc.
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