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|  MIL-D-16196E(SH)
Heaters shall consist of tubular type
heaters is not required.
electric heating elements in accordance with MIL-H-22577, secured
The
to cast bronze flanges by brazing or compression fittings.
heating element sheath material shall be seamless and fabricated
from Inconel 625 or Incology 800. Watt density shall not exceed
70 watts per square inch. The heater shall provide for minimum
The terminal box
service life of 10,000 hours and 50,000 cycles.
The
shall be class 1, drip proof, in accordance with MIL-E-2036.
ends of the element shall be hermetically sealed by ceramic to
metal seals.
Each heating unit shall be provided with an
The heaters shall
identification plate giving connection data.
be provided with temperature controllers to cycle the heater as
needed.
3,3.1.2 Dielectric voltage.
Heating units shall withstand, for a period of
1 minute, a dielectric test voltage of twice the rated voltage plus 1000 volts
between the heating elements and ground, applied continuously for a period of not
less than 60 seconds.
The frequency shall be not less than 60 hertz (Hz) and the
voltage wave shall approximate a sine wave.
3.3.1.3 Insulation resistance.
The insulation resistance of each heating
unit , when at normal operating temperatures shall be not less than 2.0 megohms.
The insulation resistance at 80 5 degrees Fahrenheit(F) shall be not less than
4,0 megohms.
3.3,2 Flow control valves.
The regulating flow control valve as specified
in 3.3(k) shall be of the type which regulates the flow rate of feedwater to that
required by the evaporator regardless of the initial pressure of the feedwater.
Flow control valves shall be in accordance with MIL-V-2042.
3.3.3 Rotameters.
Rotameters shall be of the type in which the float is
guided by flutes in the tube.
Meters shall be provided with metal casings with
safety glass windows.
Float tube packing gland followers, bolts, and nuts shall
be nonferrous.
The inlet and outlet shall be flanged.
3.3.4 F1OW meters.
Flow meters shall be provided for each distillation
unit.
Meters for flow of feed or brine shall not be readily affected by scale
formation.
In particular, meters equipped with a guide rod on which the float
rides , or with an indicating rod mounted on the float and extending through a
guide or packing gland are not acceptable.
If method of feed is such that the
ratio of feed and distillate must be controlled, feed and distillate flow meters
shall be provided; otherwise, only a feed flow meter will be required.
3.3.5 Totalizing meters.
A distillate totalizing meter shall be provided
with each unit.
The meter shall conform to MIL-F-1183 and MIL-F-1183/10 with
magnetically driven totalizing register and with union connections (with
retaining ring and O-ring seal).
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