tank, keel, test manometer

[Stuarth44]

Probable somewhere there is a thread on this, sorry if so, but it cropped up elsewhere where people were asking how they could fix leaking welded box keels with, poured in ballast

Building under survey, we had to demonstrate to the surveyors that the tanks were indeed tight
We used a manometer
leaving the tank for a few hours without the water dropping in the test rig, one is assured of a tight tank
However EXPECT the level to actually rise in heat of the day once the leaks are fixed, as the tanks warms up, so sensitive to pressure this test
I should add, you can let air in at any pressure or volume as long as the looped hose is open, you are aiming for 8ft head water, which is 2psi
obviously if the tank is huge need a big volume in to get it up to this pressure