Molten sulphur has to be carried at the temperature within the ranges of 120°C and 155°C – normally about 140°C – which places very heavy demands on the cargo equipment, also the heating, insulation of the tanks and pipework, as well as associated valves and pumps. Deepwell-type cargo pumps powered by deck-mounted electric motors are used. They are manufactured from mild steel but with bearings of special carbon material. The pumps have a heating jacket on the pipestack and shaft seal and cooling arrangements on the main bearings. Sulphur tanks are of the insulated, self-supporting type, resting on multiple supports in the hull. They are secured against rolling and pitching movements, but allowed to expand or contract with different cargo temperatures.
See also Sulphur tanker SULPHUR ENTERPRISE.