ground to fit chain. Sprockets shall be split construction
assembled with cadmium plated nuts and bolts. Sprockets on the
head shaft shall be key seated.
(3) Tracks or Rails: Monorail type beam or supporting track for
the guidance of the collector assembly shall be provided. The
track may be in the form of an up-turned channel or otherwise have
vertical guides to prevent lateral movement unless the supporting
element or carriage has built-in means of preventing lateral
movement. Rail or track shall be of sufficient size to support
the entire collector mechanism and limit deflection to 1/240 of
the span.
(4) Collector Drive Support: The collector drive shall be
rigidly supported by structural steel members of sufficient size.
Mounting plates for setting the units in place shall be provided.
d.
Collector Assembly: Collector assembly shall include carriage or
supporting element, scrapers and scraper supports and vertical
connecting members, and air supply hose (if used). Carriage or
supporting element of the collector assembly shall be firmly
attached to the collector drive through a suitable connection.
(1) Carriage or Supporting Element: Rollers for carriage or
supporting element shall be of heat-treated cast-iron, or heat
treated wrought steel with a Brinell hardness of 100 to 120. Axles
shall be mounted on roller bearing or ball bearing assemblies.
Bearings shall have a rated-life expectancy (L-10) of 40,000 hours
based on the ABMA SBRB Standards when operating under the normal
continuous operating load. Flush ball-check grease fittings shall
be provided for all points needing grease lubrication. Where rail
or track does not have means of preventing lateral movement such
beams shall be incorporated into the carriage or supporting
element through horizontal rollers or other suitable method.
(2) Scrapers and Scraper Supports: Adjustable scraper blades
shall be provided and shall be designed to continuously scrape the
surfaces of the settling tank as the collector assembly traverses
the length of the tank. The blades shall be of chloroprene
rubber. Cross bracing or other suitable members shall be provided
to properly support the scraper blades.
(3) Vertical connecting member shall be of sufficient size to
support the scrapers and scraper supports. Where the traveling
reciprocating type collector is designed to continuously collect
settled sludge the air lift pump shall be an integral part of the
sludge collector assembly and the assembly shall be designed
specifically for this purpose. Where air lift discharge piping
exerts leverage on the collector assembly, a counterweight shall
be provided to keep the entire assembly vertically aligned.
(4) Air Supply Hose: Air for air lift shall be supplied by a
suitable hose of sufficient length and diameter. Placement of
hose shall be such that there will be no interference between the
hose and any other element in the tank.
2.9.3.3
Rotating Type Sludge Collectors
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SECTION 11375N
Page 52
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