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|  MIL-D-18641F(SH)
3.15.14 Vapor separator. Each evaporator effect shall be provided with a mesh type vapor
separator, so constructed as to remove all entrained salt water from the vapor generated before
the vapor passes into the vapor feed heater or the distiller condenser. The vapor separators shall
be removable from the evaporator shells without other component disassembly.
3.16 Evaporator and stage condensers for types II and IV.
3.l6.l Tubes. Tubes of the stage condensers may be straight and expended into tube sheets
at each end or may be U-bent and expanded into an inlet-outlet tube sheet.
3.162 Baffles. Baffles for suppression of swash and for moisture separation shall be fitted as
necessary to meet the requirements of 3.13.1.
3.163 Shell. The shell of each evaporator stage shall be fitted with a sight glass. Minimum
thickness for evaporator and stage condenser shell material shall be 0.120 inch.
3.16.4 Connection and fittings. The following connections and fittings shall be provided as
required for the evaporators and the condensers:
a. Feed inlet connection
b. Feed outlet connection
c. Brine outlet connection
d. Distillate inlet from interstate drain regulator of preceding stage
e. Distillate outlet
f. Vent
g. Foundation fittings and necessary attachments for anti-rolling braces, iif required
h. Sight glasses
i. Vent connections from distillate and brine overbroad pumps
j. Thermometers and gauges
k. Lifting and handling eyebolts or lugs
1. Drain connections and loop seals
m. Access openings for cleaning evaporator feed compartments (see 3.14i.)
n. Access openings for cleaning seal pipes between stages (see 3.14i.).
3.16.5 Vapor separator. Each evaporator stage shall be provided with a mesh type vapor
separator, so constructed as to remove all entrained salt water from the vapor flashed before the
vapor passes into the condenser of that stage. The vapor separators shall be removable from the
evaporator shells\without other component disassembly.
3.17 Evaporators for type III.
3.17.1 Inspection. The evaporator shall be so arranged that the corrugated baskets will be
readily removable and easily accessible for inspection.
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