3.7.2.2
Cutting Elements
All cutting elements, including combs, teeth and bars, shall be of
stellite, Type 316 hardened stainless steel, or high-carbon chrome steel.
Elements shall be completely adjustable to allow them to be readjusted to
compensate for wear. Elements shall be removable for sharpening or
replacement.
3.7.2.3
Bearings
All bearings shall be of the antifriction type having a rated-life
expectancy (L-10) of 100,000 hours based on ABMA SBRB Standards when
operating continuously at the rated full load wattage horsepower and speed.
3.7.2.4
Lubrication
Bearings shall be either oil or grease lubricated. Gear reduction unit
shall be oil or grease lubricated. Oil lubricated bearings and reduction
units shall have sight glass or other positive means of determining oil
level. All grease-lubrication pressure-line fittings and all oil fill and
drain lines shall be easily accessible when comminutor is in place.
3.7.2.5
Anchorage
Comminutor shall be furnished complete with Type 316 stainless steel anchor
bolts and cast iron soleplate or suitable support bracket for installation
within the box channel or trough.
3.7.3
Bar Screen
The bar screen shall be constructed of 6 mm 1/4 inch by 50 mm2 inch flat
steel bars, with the 50 mm 2 inch faces parallel with sewage flow, or 13 mm
1/2 inch diameter steel bars hot-dipped after fabrication, with 25 mm one
inch space between bars.
3.7.4
Comminutor Chamber
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NOTE: Delete "or concrete" when steel plant only is
required. This specification is structured for
steel plant only, concrete plant only, or steel or
concrete plant at the Contractor's option. Among
the factors to be considered are initial cost,
maintenance costs, life expectancy, and possible
need for relocation during period of useful life.
Steel plant is generally more economical in first
cost than concrete plant; however, maintenance costs
may be higher. Concrete plant would have a higher
life expectancy in highly corrosive soils. Small
steel plants are suitable for relocation. Concrete
plant is considered as plant having outer walls of
concrete regardless of material used for interior
walls or partitions. Steel plants are considered as
plants having outer walls of steel and bottom of
steel or concrete (except that all-steel would be
needed for relocatable plants).
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Chamber shall be of steel [or concrete].
Steel chamber shall be
SECTION 11375N
Page 114
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