2.5.4
Lagoon Aeration Diffuser Tubing
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NOTE: Delete inapplicable types of diffusers and
materials of construction.
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Diffuser tubing shall be [13] [_____] mm [1/2] [_____] inch inside diameter
flexible polyethylene tubing containing small, precise, orifices or slots
in the lower side of the tubing at [38] [_____] mm [1-1/2] [_____] inch
maximum spacing. The orifice shall be small enough to prevent particulate
matter from flowing through the orifice during negative diffuser pressure.
The tubing shall be preweighted by a continuous lead strip in the bottom of
the tube and encapsulated in polyethylene.
2.5.5
Spare Diffusers
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NOTE: The percentage of replacements required will
be inserted. A sound policy would require
sufficient media to enable the operator to replace
all media in any one aeration tank.
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Not less than [_____] percent of the installed quantity of diffusers shall
be furnished as replacements. Diffusers shall be complete with all parts
required for installation.
2.6
HOIST
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NOTE: Coordinate with type of air distribution
system specified. Delete steering attachment where
not required.
**************************************************************************
Portable hoist designed to raise and lower the [removable] [rotary or
swing] air distribution system shall be provided. Hoist shall be furnished
by the aeration system manufacturer. The hoist shall be on wheels or
casters [and shall have a suitable steering attachment]. The unit shall be
powered by [hand] [hand pump] [battery operated motor] [air operated motor]
[electric motor] [gasoline engine]. Means shall be provided to hook the
hoist in place during the hoisting operation. The lifting arm shall have a
quick latching arrangement to securely grip the air diffusion unit without
the use of tools. The hoist shall be of sufficient capacity for the
required service.
2.7
METERING AND INSTRUMENTATION
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NOTE: Insert section number and title or delete
sentence and insert metering and instrumentation
requirements.
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Metering and instrumentation shall be as specified in Section [_____].
SECTION 11375A
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