1.0 General Specifications

There shall be furnished one (1) one only Grind Hog™ Model 24ASX T/S Comminutor as manufactured by G.E.T. Industries Inc. Rotation shall be in a clockwise direction.

1.1 Design Criteria

The comminutor shall be designed to handle the flows indicated below, within the head loss noted.

• a) hydraulic capacity 10 MGD (37,800m³/day)
• b) satisfactory operation shall occur under conditions of zero flow
• c) head loss at peak flow shall not exceed 20 inches (508 mm)
• d) design shall be such that the flow enters the size reduction and screening device horizontally and exits vertically downward to facilitate the flushing of solids

1.2 Cover Plate

Shall be:

• a) of heavy-duty construction and of high quality cast iron
• b) fitted with 4 position lock down arrangement, and 2 alignment holes for repositioning following service
• c) located on, and positioned by wall mounted supports allowing for ease of removal for inspection and maintenance.

1.3 Rotating Drum Screen

• a) heavy-duty Cast Ductile Iron ASTM 536, grade 60-45-18

1.4 Cutting Elements

• a) replaceable shear bars constructed of high-quality A2 tool-steel shall be attached to the rotating drum. Each shear bar shall be machined from solid bar stock, surface ground to establish exact tolerances
• b) stationary cutting bar shall be of high-quality 01 tool steel hardened to a minimum of 56 Rockwell C, and shall be reversible, allowing for four (4) sets of cutting edges prior to sharpening or replacement
• c) all submerged fasteners shall be of stainless steel

1.5 Motor

Submersible, Explosion-proof 1.5 Hp. (1.12 kw), 1750 RPM ______ volt, 3 phase, 60 HZ, rated for continuous-in-air or submerged in sewage service. Power control cable of 25 ft (7.6 m) included. Class 1, Group C and D, Division 1 Hazardous locations. The motor shall feature:

1.6 Drive Arrangement

• a) the motor shall be close-coupled to a speed reducer drive, a heavy duty planetary gear of the totally enclosed non-vented type suitable for total submergence during emergencies
• b) double seals on the output shaft shall ensure flood-proof operation through a reduction ratio of 59:1
• c) the cycloidal reducer shall be capable of withstanding shock loads to 500% of its mechanical rating of 11.1 Hp. and be warranted for two (2) years
• d) the drive shall have a minimum full load efficiency of 90% and be pre-lubricated with grease, requiring routine maintenance every 500 to 1,000 hours

1.7 “Toilet Seat” Channel Mounting System

Shall consist of a box style structure fabricated of 304 stainless steel dimensioned to suit the existing channel and supported from above for ease of installation