permanent ballast

These are used with compact fluorescent tubes that plug into a light fixture that has a permanent ballast.

The refit involved the addition of 20 tonnes of permanent ballast in the hull in order to give extra stability.

This included fitting anti-submarine rocket launchers (RBU-2500) new radar and adding permanent ballast for improved stability.

The first twenty ships were so far advanced in construction that it was necessary to remove the 'X' 4 inch mount and add 50 tons of permanent ballast.

Limping into the Falklands with damaged steering, rigging and deck fittings, she ran onto Uranie Rock and would have sunk were it not for 200 tons of concrete she was carrying as permanent ballast.

The stability effect of this modification was analyzed by FaAA, and it found that stability improved due to conversion of the No. 3 center tank to permanent ballast as part of the top drive modification.

The vessel is complete and ready for service in every respect, including permanent ballast, spare parts, lubricating oil, and working stores but is without fuel, cargo, drinking or washing water, officers, crew, passengers, their effects, or any other variable load.

The ships carried a great deal of water, but if possible it was used only for cooking, and much of it occupied the 'ground tier' of casks in the bottom of the hold, which was part of the permanent ballast and only started in emergency.