17-02-2014, 12:27 PM
We had them for dipping ocean-side oil tanks - with a bit of skill, it was possible to check the sludge/water and water/oil interface and, with a set of tables, known as strapping tables, work out the volume of oil in the tank. Now done with automatic gauges that work it all out for you. At least ours didn't need batteries or other power!
Colin
Colin
