Originally Posted by AndyJ
Rogue/Dodgy workmen would just as easily knock up a dodgy certificate as easily as a dodgy part IMO.
But if it is handed over to a customer, and if at a later date the cylinder failed due to bad engineering injuring that customer or a 3rd party, then this could be used legally against who carried out the modification. Just the same principle as when I calibrate say a pressure transmitter that protects a vessel from overpressurisation i will issue a calibration cert on that instrument outlining its performance during that test. Yes it is a test only on that day of testing but if something was to happen and it is found that a/ I issued the cert without performing the test or b/ carried out that test incorrectly or somewhere my method was flawed then that cert would be used as evidence against me legally, I could be in very hot water! This was my thinking about certificates being issued.