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(2) Chambers in which orifices are installed for injection of feed into the evaporating
section. (Dislodged scale or debris may accumulate and clog the orifices.)
3.14.1 Type I. A type I distillation unit shall consist of one or more evaporating effects
composed of a shell or shells in which horizontal, straight or U-bent tube bundles are submerged
in the salt water to be evaporated and supplied with heating steam or vapor inside the tubes, a
distiller condenser, distillate cooler if necessary, air ejectors and after-condenser, vapor feed heaters
if necessary, integral piping, valves and fittings, thermometers, gauges, flash tank drain regulators,
meters, pumps, motors, controllers, and salinity indicating equipment.
3.14.2 Type II. A type II distillation unit shall consist of one or more evaporating stages in
a single or multiple shell, a salt water feed heater, distillate cooler if necessary, air ejectors, after
condenser, integral piping, valves and fittings, thermometers, gauges, drain regulators, meters,
pumps, motors, controllers, and salinity indicating equipment. Each stage shall be equipped with
a feed inlet with means for introducing the feed into the evaporator shell in proper form for most
effective flashing of part of the water into vapor, necessary baffles and a vapor separator to
prevent carry over of salt water, and a stage condenser to condense the vapor so flashed.
3.143 Type III. A type III distillation unit shall consist of one or more evaporating effects,
each composed of a vertical, corrugated basket or multiple baskets surrounded by a shell, in which
the salt water to be evaporated is contained between the shell and basket corrugations and the
heating steam or vapor is contained inside the corrugated basket, a distiller condenser, distillate
cooler if necessary, air ejector and after condenser, vapor feed heaters if necessary, integral piping,
valves and fittings, thermometers, gauges, flash tank drain regulators, meters,, pumps, motors,
controllers, and salinity indicating equipment.
3.14.4 Type IV. A type IV distillation unit shall consist of one or more evaporating stages in
a single or in multiple shells, a salt water feed heater for transferring heat from the hot fresh water
to the sea water, distillate cooler if necessary, air ejector, after condenser or vacuum pump (see
6.2), integral piping, valves and fittings, thermometers, gauges, drain regulators, meters, pumps,
motors, controllers, and salinity indicating equipment. Each stage shall be equipped with a feed
inlet with means for introducing the feed into the evaporator shell in proper form for most
effective flashing of part of the water into vapor, necessary baffles and a vapor separator to
prevent carry-over of salt water, and a stage condenser to condense the vapor so flashed.
3.14.5 Type V. A type V distillation unit shall consist of one or more evaporating effects
comprised of an evaporator shell or shells in which a tube bundle is submerged in the salt water
to be evaporated and the hot fresh water is circulated through the tubes. The remaining com-
ponents shall consist of a mesh vapor separator, a distiller condenser, air, sea water, brine and
distillate pumps or eductors, distillate coder if necessary; valves, fittings, thermometers, gauges,
drain regulators, meters, pump motors and controllers, and salinity indicating equipment.
3.14.6 Supports. Supporting feet or brackets shall secure the unit, its components or
accessories adequately against high impact shock or when the ship is listed, pitching, or rolling
(see 3.13.1). Components shall not be supported by plates or brackets in such manner that the
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