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.
Engine cooling
8 companies
Closed-circuit cooling of propulsion and auxiliary engines: keel coolers, box coolers, plate and shell-and-tube heat exchangers, central coolers and charge air coolers.
Filter companies: Engine cooling
Fuel gas supply systems
Alfa Laval
Swedish maker of marine fuel supply systems for LNG, methanol and ammonia, gas combustion units and OceanGlide air lubrication.
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.
Shell-and-tube heat exchangers & charge air coolers
E.J. Bowman (Birmingham) Ltd
Birmingham, UK maker of shell-and-tube heat exchangers, charge air coolers, header tanks and oil coolers for marine engines and e-propulsion.
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.
Shell-and-tube heat exchangers & charge air coolers
Sen-Dure Products
Fort Lauderdale maker (since 1935) of copper and CuNi shell-and-tube heat exchangers and oil coolers for marine engines from 10 to 2,000+ hp.
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.