The mixture percentages,flow capacities, etc. Upon investigation, it was determined that a large bulk tank supplying/distributing welder gas had gone empty but was not discovered until the next day. The majority of the tanks, built during one particular day, had multiple pinhole leaks. The ASME Mfr's customer was QUITE upset when he started getting complaints of tank leaks from his own customers. The sandblasting, performed after the hydrotest, but before painting cleaned all the slag/pinholes up and was not apparent to the painter. The reason it passed hydrotest was because the slag was contained in the weld. This was not discovered at hydrotest but after shipping to the customer. As an AI, I have seen a case in a large "multiple duplicate" UG-90(c)(2) ASME manufacturing facility where inadequate mixing in a bulk mixing/distibution setup for shop gas caused excessive slag/porosity buildup in the weld joints.
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