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Chemical tanks for continuous injection feedwater treatment chemicals |
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|  MIL-D-16196E(SH)
3.4.2.3 Chemical tanks for continuous injection feedwater treatment
chemicals,
Tanks used for continuous injection feedwater treatment chemicals and
acid shall be of sufficient size and access opening to allow mixing of chemicals
inside the tank.
Size of the access opening shall be approved by the design
approval activity.
A means shall be provided to determine the liquid level in
the tank.
This device shall be graduated in 1/2 gallon increments,
Tanks and
measuring devices shall meet section 3 requirements of this specification.
The
lid cover with quick release/latching device shall be watertight.
The tanks
shall be provided with a bottom drain valve.
The tanks shall be made of the
specified copper-nickel alloy.
Tanks shall have a standpipe in the center of the
tank and at a height to preclude sucking air during ship motion.
3.4.3 Distillate quality.
(a) Submarine or nuclear propelled surface ships. Salinity content of
distillate produced shall not exceed 0,0325 equivalents per
million (epm), 1.15 (p/m).
(b) Non-nuclear surface ships.
Salinity content of distillate pro-
duced shall not exceed 0.065 epm, 2.32 p\m chlorides or 0.250
grams per gallon of sea salts.
3.4.4 Starting operation.
The unit shall produce distillate meeting
requirements as specified in 3.4.3 and 3.4.1 within 4 hours of start up for type
I distillers and within 2 hours for type II distillers over a range of seawater
temperatures of 28 to 85F.
3.4.5 Clean tube operation.
(a) With clean heat transfer surfaces, class A units shall produce at
least 110 percent of rated capacity and class B units shall
produce 120 percent of rated capacity.
(b) Clean tube capacity in units using the continuous injection feed
treatment system shall be achievable by on-line citric acid
cleaning,
The total time to start and complete an on-line acid
cleaning cycle shall not exceed 2 hours.
3,4.6 Plugged tube operation.
The unit shall produce rated capacity of
distillate when 10 percent of the evaporator tubes are plugged,
3,5 Power.
Distilling plant power requirements shall be tested as speci-
fied in 4.6.1.
3.6 Shock resistance, sound and vibration.
3.6.1 Shock.
Unless otherwise specified (see 6,2), the assembled unit
shall conform to grade A shock requirements in accordance with MIL-S-901.
Shock
tests of complete distillation units or of separately mounted components thereof
weighing less than 15,000 pounds are required.
Shock test extension will be
considered for units if they are of similar design, construction, weight and
materials to units which have successfully passed shock test in accordance with
MIL-S-901.
Shock test extension requests shall be prepared in accordance with
MIL-S-901.
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