constructed of 6 mm 1/4 inch steel plate, with necessary angle iron on top
edges and having not less than 200 mm 8 inch flanged inlet and 200 mm 8 inch
flanged outlet. The chamber shall be fitted with diversion slide gate(s),
comminutor inlet and discharge, anchor bolts, inclined or vertical bar
screen, and contain a stop gate of steel or aluminum to stop flow to
comminutor when it is out of service.
3.8
SCREENING BASKET
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NOTE: Delete the paragraph when comminutor is
required for plant. For plants of 1.09 L/s 25,000
GPD capacity and below, the comminutor and bar
screen unit may be omitted, and in lieu thereof, a
screening basket provided in the aeration tank. For
installations in which all sewage has passed through
a comminutor and bar screen upstream of the plant, a
comminutor and bar screen unit need not be provided
as a part of the plant equipment.
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There shall be furnished and installed at the plant influent, a readily
removable, fabricated steel screening basket, sized for maximum flow, which
shall be located so that the total volume of incoming raw sewage will be
screened before it enters the plant. The basket shall be fabricated from 5
mm 3/16 inch diameter 302 stainless steel wire or 10 mm 8 inch hot-rolled
steel bars with 25 mm one inch space between bars.
3.9
INSTALLATION
3.9.1
General
Installation work shall include construction of the concrete support
slab(s); setting and anchoring of the treatment plant; construction of
concrete pads for equipment not mounted on the plant; field installation of
plant equipment, accessories, and appurtenances shipped unmounted to the
project site; installation of piping from blowers to air header, piping
connections to plant inlet and outlet, and installation of water service
line; and installation of electrical wiring from electrical control system
enclosure to motors and installation of electrical service to the
electrical control system enclosure. The installation work covered by this
section also includes earthwork operations as interrelated to plant
installation. Except as modified or amplified herein, sewage treatment
plant shall be installed in accordance with the recommendations of the
manufacturer of the plant.
3.9.2
Manufacturer's Representative
The Contractor shall procure the services of an engineer representative of
the manufacturer of the major portion of the treatment plant who is also
familiar with the other equipment furnished. The representative shall
inspect the equipment after erection, make adjustments in placing the
equipment in operation, and shall be present during final inspection,
start-up, and acceptance test.
3.9.3
Sequence of Operations
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NOTE: Insert appropriate Section number and title
SECTION 11375N
Page 115
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