General Specifications for
NRG COMPANY, INCORPORATED
Rectangular Clarification Equipment
Part 2 - Products
2.10 Drive Unit
A.

Drive unit shall consist of an electric motor and speed reducer mounted on a common baseplate. Drives shall be configured as is shown on the plans and indicated herein. Drive units shall be sized for continuous 24 hour operation, AGMA rated, with a service factor of 1.5. The Reducer shall be sized for the required service and shall be of the helical, cycloidal, or worm gear type. Reducer shall be totally enclosed, running in oil or grease with anti-friction bearings throughout.  

B. Motor shall be totally enclosed, fan cooled, three phase, 60 Hz., 208-230/460 volt, 1.15 service factor severe duty style motors with a minimum of ½ horsepower moter. The motor shall be connected to the reducer by means of a flexible coupling and shall be sized to transmit the torque required.   
C. The Drive Shaft shall contain key ways with fitted keys which are properly sized. The Drive Sprocket shall consist of a UHMW or Nylon-6 sprocket tooth section bolted to a oil filled nylon shear pin hub fitted with necked-down steel shear pins sized to protect against overload. Drive units which drive more than one mechanism shall have jaw clutch and handwheel assemblies on each drive shaft to permit disengagement of one or more mechanisms. Jaw clutch and handwheel shall be oil filled nylon. Jaw is to be special spiral engagement type or pin clutch design to cause disengagement upon reversing the drive shaft.   
D. The Driven Sprocket shall consist of a UHMW-PE segmental rim mounted on a cast iron hub or Nylon teeth on a Nylon hub. The Driven Sprocket shall have 40 teeth with a minimum pitch diameter of 33.25". The sprocket shall be of the split hub design and shall be offset to allow for flight clearance.
E. The chain tightener shall consist of an Oil Filled Nylon slotted bracket with 8" adjustment and non-metallic shaft with a H78 UHMW-PE or Nylon-6 8T idler sprocket. The sprocket shall be secured by means of a non-metallic set collar. Bracket shall mount on an adjustable angle support.