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Page Title:
Vapor feed heaters for types I and III. |
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|  MIL-D-18641F(SH)
3.20.2 Cooling surface The distillate cooler shall have sufficient surface to cool the distillate
drained from the distiller condenser flash chamber or the last stage condenser to the specified
temperature when supplied with seawater at 85 "F when the distillation unit is operating at rated
capacity.
3.21 Vapor feed heaters for types I and III.
3.21.1 Vapor line A straight or U-bent tube type feed heater shall be provided in the vapor
line from each effect evaporator except the last; the heating agent shall be the vapor from the
evaporator shell which shall pass over the tubes with the feed passing through the tubes.
3.21.2 Feed heater. Each vapor feed heater shall be provided with the following connections
and fittings.
a.
Water boxes:
(1)
Feed inlet connection
(2)
Feed outlet connection
(3)
Air vent
(4)
Drain connection.
b. Shells:
(1)
Vapor inlet connection
Vapor outlet connection
(2)
(3)
Drain connection
(4)
Attachments for foundation, if separate shell is furnished.
3.21.3 Heater construction. The vapor feed heaters may be built into the shell of the
evaporator effect from which the vapor for heating is obtained, or may be furnished in a separate
shell, as best fits the overall arrangement of the distillation unit. The tube nest shall, in either case,
be removable from the shell.
3.22 Tube nest drain regulator for types I and III and salt water feed beater drain regulator
for type II.
3.22.1 Drain regulator. A drain regulator shall consist of a cage and rover enclosing a
balanced cage valve operated by a ball float or by a diaphragm and air pilot operated control. A
drain regulator may also be built into the hotwell or sump of a salt water feed heater, thereby
eliminating the east cage and equalizing connections.
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