When a valve is newly manufactured I can understand why it needs a full pressure test to ensure the integrity of the casting or forging and to proove the pressure containment ability. If that valve develops a leak because of a bad bonnet gasket or stem seal and the gasket or seal is replaced in...
We have a titanium air cooler on top of an electric motor. The tubes, tubesheet and heads are titanium and the head is clamped onto the tubesheet by way of tapped holes in the tubesheet. Everything was previously bolted together using carbon steel bolts which were found to be moderately rusted...
