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| MIL-D-18641F(SH)
d. The distilling unit manufacturer shall furnish pumps of adequate capacity for the
various services, with discharge pumping heads as determined by the shipbuilder
(see 6.2), and with adequate motor horsepower as determined by these conditions.
e.
Feed for types I and III distilling units shall be furnished normally under sufficient
pressure from the distiller condenser circulating system by means of a back pressure
valve in the overboard discharge line, the valve to be furnished by the shipbuilder. In
the case of multi-effect units, in which this would require excessive circulating pump
power, a separate feed pump shall be furnished (see 6.2).
f. Feed and circulating pumps shall be in accordance with MIL-P-17840 or MIL-P-17639
where these pumps are not covered in the rating charts of MIL-P-17840. Distillate,
brine, and condensate pumps shall be in accordance with MIL-P-18472, except that the
brine pump shall have mechanical seals in accordance with MIL-P-17639. The distillate
and condensate pumps shall be furnished with stuffing box packing. Sealing water shall
be supplied from the discharge piping except for the brine overboard pump which shall
be supplied from the feed or circulating pump discharge. Individual motor driven pump
units are required (double ended motor pump units are not permitted). Salinity
indicating equipment shall be in accordance with MIL-S-5103. Steam pressure reducing
valve shall be in accordance with MIL-V-18030. Each steam pressure regulating valve
shall be supplied with isolation valves and by-pass the throttling valve, Y-strainer and
supply and discharge pressure gauges. When specified (see 6.2), a water operated
eductor shall be provided in lieu of a brine overboard pump.
A drain regulator (see 3.22) or other type of automatic level controller shall be
g.
furnished for any component of the distillation unit fresh water system wherein a
specific water level must be maintained to permit operation of the unit.
h. When necessary (such as in submarine installation in which the seawater temperature
varies rapidly when the depth of submergence changes), a thermostatically controlled
valve shall be provided either in the outlet circulating water line from the distiller
condenser or to bleed air into the condenser, so as to prevent sudden changes in
vacuum and consequent unbalanced operation which will result in carry-over of salt
water from the evaporator to the distiller condenser.
i.
Cleanout openings or flanges shall be provided as required to enable manual cleaning
out of accumulated scale, mud or sand from any location in which such accumulation,
after any length of time, will interfere with the proper operation of the unit. Examples
are:
(1) Seal pipes between effects or stages which may become clogged with flakes of scale
or with mud or sand which may accumulate.
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