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|  MIL-D-l864IF(SH)
3.5.10 Level controls. Adjustable or fixed weir type level controls shall be provided for
maintaining a constant level of brine in each effect.
3.15.11 Evaporator.
The following connections and fittings shall be provided for each
evaporator:
a.
Evaporator shells: (minimum thickness 0.120 inch)
(1)
Feed inlet connection
Brine outlet connection
(2)
(3)
Compound pressure and vacuum gauge, 4-1/2 inch diameter
(4)
Water gauge glass, with mark showing top of the tubes. When weir level
controls are provided, gauge glasses shall be located thereon.
(5)
Relief valve (first effect only)
Vapor discharge connection
(6)
(7)
Sump with removal plate for cleaning
Foundation fittings and necessary attachments for anti-rolling braces, where fitted
(8)
(9)
Drain from vapor separator if external separator is provided
Sight glasses
(l0)
(11)
Air vent from brine pump in last effect shell only.
b. Evaporator steam heads
(1)
Steam supply connections
(2)
Drain connection
(3)
Air vent connections
(4)
Relief valve (first effect only)
(5)
Gauge glass; except when drain regulators are provided, the gauge glass shall
be located thereon
(6)
Compound pressure and vacuum gauge, 4-1/2 inch diameter
(7)
Thermometer
(8)
Lifting and handling eyebolts or lugs.
3.15.12 Orifice plate One orifice plate with proper size orifice shall be provided with the
type I distillation unit for the steam supply to the fret-effect steam chest to limit the steam flow
to that specified for rated capacity. Orifice plate shall be provided with a tab for pulling and shall
be stamped with the orifice size and manufacturer's part number.
3.15.13 Desuperheater. A desuperheater shall be provided in the steam supply piping
furnished with the distillation unit, if required for proper performance of the unit (type I).
Desuperheater shall be supplied with a strainer and isolation valve.
35
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