Keel cooling
R.W. Fernstrum & Company
Menominee, Michigan maker of GRIDCOOLER keel coolers since 1945; also builds WEKA Boxcoolers in the US and supplies OMEGA Laser Plates.
Box coolers
5 companies
Tube-bundle coolers installed inside a sea chest in the hull; sea water flows through by natural convection and ship speed.
Filter companies: Box coolers
Box coolers
Blokland Non-Ferro
Family-owned Sliedrecht (NL) maker of box coolers, bottom-type coolers and shell-and-tube oil coolers, plus propulsion components, since 1962.
Shaft bearings
Duramax Marine
US maker of Johnson Cutless water-lubricated shaft bearings and DuraBlue composite stern tube bearings and rudder bushings.
Box coolers
Kelvion
Herne-based heat exchanger group (ex-GEA Heat Exchangers) with marine box coolers, plate and shell-and-tube HEX and charge air coolers.
Box coolers
WEKA Marine
Dutch box cooler specialist (since 1957) making CuNi, aluminium-brass and steel coolers; sister company of Fernstrum, whose keel coolers it sells.