2.13.1.5
Finish
The exterior finish on exposed pipe, pipe fittings, valves, gauge cases,
and trim shall be polished nickel or chromium plating, except on stainless
steel. The finish of other components not fabricated of stainless steel
may be manufacturer's standard finish.
2.13.2
Cabinet-Type Water Distillation Unit
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NOTE: A condensate feedback assembly can be an
excellent source of purified supplemental feed water
to improve distillate quality and reduce the
frequency of cleaning (descaling) a water still;
however, a condensate feedback assembly should never
be specified if corrosion-inhibiting compounds are
used, or contemplated for use in the central steam
generating plant, or if the distillate will be used
for production of surgical fluids. Distillation of
the condensate would not remove compounds such as
filming amines (octadecylamines) and/or soluble
amines (morphine) which could be harmful to patients.
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Cabinet-type water distillation unit shall be designed to produce its rated
capacity at 276 kPa 40 psig steam pressure and 207 kPa 30 psig water
pressure. The still with [condensate feedback purifier and] distillate
cooler shall produce pyrogen-free water with a pH value of 6.5 to 7.2,
total solids of 0.05 to 0.2 ppm, and with an electrical resistance of
1,000,000 to 3,000,000 ohms/cm at 25 degrees C 77 degrees F.
2.13.2.1
Storage Tank
Storage tank shall be made of stainless steel or tin-coated copper or
copper alloy sheets. The storage tank shall be supplied with an immersion
type ultraviolet lamp replaceable without exposing the tank interior to
atmospheric contamination. Tank shall have a water level sight gauge and a
tin-coated, self-closing draw-off faucet.
2.13.2.2
Controls
Automatic controls and accessories shall start the still when distilled
water in the storage tank falls to a preset level and shall stop the still
when the storage tank is full. The controls shall include a tank level
control, automatic water and steam valves, and a manually-operated drain
valve. A steam trap pressure gauge, automatic cooling water temperature
regulator, steam and water pressure reducing valves, and effluent purity
meter shall be provided. The purity meter shall be a direct-reading
continuous-measurement type having a range of 0-18 megohms. Meter may have
multiple scales and shall have an accuracy of not less than 2 percent of
full scale. All gauges, switches, and signal lights shall be mounted on an
instrument panel in the cabinet. All interconnecting piping shall be
provided.
2.13.2.3
Condensate Feedback Purifier
The feedback device shall prepurify steam condensate before distillation to
eliminate scale build-up inside the still's evaporator. Prepurification
equipment shall include condensate cooler with demineralizing and
SECTION 11710
Page 24
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