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| MIL-D-l8641F(SH)
3.22.2 Regulator equipment. Each regulator shall be provided with the following fittings and
connections:
a.
Drain inlet connection
b.
Discharge connection
c.
External bypass suitably valved (May be omitted if valve can be jacked open manually)
d.
Air vent
e.
Equalizing pipe to the part being drained
f.
Water gauge glass, protected
g.
External gear for hand operation (see item c).
3223 Regulator control. A drain regulator shall be provided for the control of the discharge
of the tube nest drain pump or salt water feed heater drain pump so as to maintain adequate
submergence. The regulator shall be so located as to drain adequately the first effect steam chest
or the salt water feed heater shell. The regulator shall be provided with equalizer connections to
the steam chest of the evaporator or the shell of the salt water feed heater.
3.22.3.1 Pressure differences. In cases where pressure differences between stages are too large
for use of loop seals, the regulator specified in 3.22.1 may be used as an interstate drain regulator.
3.22.3.2 Heat exchanger component. A drain regulator shall be provided for any heat
exchanger component of a distillation unit, the design of which requires that a definite liquid level
be maintained. The drain regulator shall be in accordance with 3.22.1.
.
3.22.4 Compensation of pressure difference In case the first effect steam chest or the salt
water feed heater shell is to be drained into a main or auxiliary condenser instead of a steam
chest drain pump or a salt water feed heater drain pump being used, means shall be provided by
the shipbuilder for compensation of the difference in pressure between the steam chest or salt
water feed heater and the condenser into which they are drained.
3.23 Fittings.
3.23.1 Gauge glasses. Gauge glasses shall be provided for the different components as
required. They shall be protected and mounted in fittings in accordance with MIL-I-20037 and of
the indirect type.
3.232 Relief valve Type I distillation units shall be provided with a relief valve on each
evaporator steam chest and shell. Types II and IV distillation units shall be provided with a relief
valve of sufficient size to protect the evaporator shell should the brine overboard valve be closed
when the feed pump is in operation or a suitable rupture disc shall be provided. Type II salt water
feed heater shell shall also be provided with a relief valve. Type III distillation units shall be
provided with relief valves of sufficient size to protect the baskets from internal over-pressuring.
Relief valves shall conform to type A-1, class C of MIL-V-20065.
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