2.1.8
Couplings
Fittings, flanges, bolts, nuts and washers shall be the same material as
the piping unless otherwise indicated. Sleeve type couplings for ozone
service shall be of stainless steel conforming with ASTM A 312/A 312M,
Grade TP316L with ozone resistant gaskets. Couplings for non-ozone ferrous
metal piping shall be ASTM A 53/A 53M, Grade B.
2.1.9
Insulating Joints
Insulating joints shall be provided when ferrous metal piping is joined
with non-ferrous metal piping, fitting or valve materials. Insulating
flanges shall be installed and have insulating flange gaskets, insulating
sleeves for studs, and insulating washers for both sides of flanges. Steel
washers shall be installed between the insulating washers and nuts.
Couplings shall be of the same pressure rating as the pipe installed.
2.1.10
In Pipeline Static Mixers
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NOTE: Static mixers are generally recommended to
ensure complete mixing when peroxide is used.
Static mixers may also be needed in other processes
in the treatment train; if so, coordinate and list
those requirements separately or coordinate them
with other specification sections to ensure there is
no duplication.
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In pipeline static mixers shall be installed [at the locations indicated]
[upstream of the reaction chamber]. Mixers shall be [installed in a
flanged section of piping] [with removable mixing sections] [inserted into
the pipeline], have a pressure rating equal to that of the piping
installed, have a maximum headloss of [_____] mm inches of water, [at
[_____] L/s gpm] while inducing completely turbulent mixing conditions in
the pipeline installed. Mixers [and housing] shall be constructed of
[Grade 316 stainless steel] [_____] and be compatible with [hydrogen
peroxide] [_____]. [The static mixer shall be ported for direct
application of the applied chemical.]
2.1.11
Bolts, Nuts, Anchors and Fasteners
Bolts, nuts, anchors and fasteners shall be stainless steel in conformance
with ASTM F 593.
2.2
MANUFACTURED UNITS
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NOTE: Edit the following paragraphs to reflect the
type of ozone generator feed gas (air or oxygen)
that is included in the design package. A cost
comparison should be performed prior to selecting
the feed gas. Typically, oxygen in a liquid form or
generated onsite from ambient air will be used. Air
feed ozone generators typically produce ozone
concentrations of approximately 2 percent in air,
while oxygen feed systems typically produce ozone
concentrations of 6 percent or greater in oxygen.
SECTION 11377
Page 18
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