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|  MIL-D-16196E(SH)
Distillate boiler section may be provided below the
3.7.2 Boiler section.
salt water feed and recirculation section or may be a separate component. It
shall be provided with connections for insertion of the electric heating
elements , distillate supply from the evaporator distillate collection space,
vapor offtake connection to the evaporator section, a filling connection for
start-up, and as necessary for operation, sight window assemblies and level
indicators as specified in 3.7.3 and 3.7.4.
Sight window assemblies using glass in
3.7,3 Sight window assemblies.
accordance with MIL-G-2860 shall be composed of a metal flanged frame to be
bolted to a boss or flange on the evaporator shell.
The frame shall contain
the sight window.
The window shall be secured with its gaskets by means of a
ring screwed into the frame to obtain even pressure on the window so that
the pressure on the window is not changed when the sight window frame assembly
is removed from the evaporator shell.
Jack screws shall be provided in the
flange of the frame.
3.7.3.1 Sight window assemblies using heat resistant, plastic acrylic
sheet in accordance with MIL-P-5425, in lieu of glass, shall be composed of
a single flange bolted to a boss or flange on the evaporator shell and con-
This shall not be used in
fining the plastic sheet between resilient gaskets.
applications above 185F.
Jack screws shall be provided in the flange.
3.7.4 Level indicators.
Evaporators shall have indicators of the indirect
type in accordance with MIL-I-20037 to indicate water levels in the evaporator
and boiler sections.
3.8 Feed heat exchang ers . Unless otherwise specified (see 6.2), the feed
For
heat exchangers shall be of the plate and frame type for class B units.
class A units, the feed heat exchanger shall be either shell and tube or plate
and frame.
It shall be a three stream design with the incoming feedwater heated
by the exiting brine and distilled water.
Plate and flame heat exchangers shall
consist of corrugated gasketed plates compressed between a fixed end plate and a
Shell and tube units shall conform to MIL-C-1573G.
movable compression plate.
Materials shall be specified in table I.
Plate and frame heat exchangers shall
be designed such that two men can disassemble, service, and assemble it in place.
When tubes are expanded into
3.9 Tubes and tube sheets for evaporator.
tube sheets or headers, the expansion shall be accomplished by means of an auto-
matic tube expander control, using a tube expander in accordance with
MIL-E-15809.
The expander shall be adjusted so that the expansion is stopped
Holes for copper-
not closer than 1/8 inch to the inner face of the tube sheet.
nickel tubes in the tube sheets or headers shall be drilled 0.002 inch larger
than the nominal outside diameter of the tubes with plus 0.005 inch tolerance.
Minimum tube sheet
Minimum ligament between holes for tubes shall be 3/16 inch.
thickness shall be 3/4 inch.
Tube hole drilling requirements for titanium tubes
shall be approved by the drawing review activity.
3.10 Compressor.
Unless otherwise specified, the compressor shall be of
Materials shall be bronze, copper-nickel
the single stage centrifugal type.
Compressor
alloy, titanium, or other material suitable for the purpose intended.
design and materials shall be approved by the contracting activity or Government
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