provided.
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Bulk LOX storage tanks shall be [_____] kg pound double walled vertical
tanks constructed in conformance with [ASME BPVC SEC VIII D1] [_____],
rated for a maximum operating pressure of [1.2] [_____] MPa [175] [_____]
psi and design temperature between minus 212 and plus 65 degrees C minus
350 and plus 150 degrees F, and seismic parameters defined in previous
paragraph. The inner wall shall be constructed of [Grade 304 stainless
steel] [9 percent nickel steel] [_____], the outer shell shall be
constructed of carbon steel with a minimum outer shell thickness of [10]
[_____] mm [0.375] [_____] inches. Annular area between the inner and
outer walls shall be insulated to limit oxygen boil off rate to less than
[0.25] [_____] percent of the tank capacity per day at the maximum ambient
conditions. Piping shall be copper or 316 stainless steel. Fittings shall
be bronze or 316 stainless steel.
2.2.2.2
Vaporizers
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NOTE: Vaporizers should be designed for the
anticipated flow rate to the ozone generator. If
vaporizers are oversized, gas temperatures will
reach outside ambient temperatures, resulting in
higher oxygen gas temperatures during the summer
months being fed to the ozone generator, reducing
its efficiency. Normal operating pressure for an
ozone generator is approximately 103 kPa (15 psi).
Resulting pressure at the diffusers is approximately
103 kPa (15 psi) less system losses.
In cold climates, heaters may be required to warm
the oxygen gas feed to the ozone generator. The
actual heating requirements should be coordinated
with the ozone generator manufacturer. In cases
where ambient temperatures fall below freezing for
extended periods, supplementary heating may be
necessary.
LOX systems may require a small quantity of nitrogen
gas be added to the feed stream to facilitate ozone
gas flow through the generator. This may be
accomplished by adding a small volume of dried
ambient air (about 2 percent).
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Vaporization equipment shall consist of a minimum of [2] [3] ambient air
vaporizers and [single] [double] regulator system complete with automatic
switching and a manual bypass. Each vaporizer shall be rated for 100
percent capacity, under continuous operation at a [_____] cubic meters per
second SCFM withdrawal rate and also capable of supplying a peak withdrawal
rate of [_____] cubic meters per second scfm. The vaporization equipment
shall be designed for an inlet pressure of [_____] kPa psi, and a maximum
headloss between the tank and ozone generator of [_____] kPa psi. The
vaporizer extrusions shall have extra wide spacings between the individual
extrusions with a minimum area per extrusion of [1.65] [_____] square
meters/meter [5] [_____] sf/ft. [Heaters shall be provided to
automatically warm the oxygen feed gas to the ozone generator when the
oxygen feed temperature falls to less than [_____] degrees C F. Heaters
SECTION 11377
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