should be required.
15. Wind load and ice load for rotating sludge
collector.
16. Organic loading (5-day BOD) if other than that
given in the text.
17. Total suspended solids if other than given in
the text.
18. Size of hypochlorite mixing tank if larger
capacity than 113.4 L 30 gallons is needed.
19. Size of hypochlorite solution tank if larger
capacity than 208 L 55 gallons is needed.
20. Whether, for extended aeration type plant,
eventual conversion to step aeration type is
anticipated.
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(1) Motor: Motor shall be constant speed, totally enclosed,
horizontal type, suitable for outdoor service, and conforming to
NEMA MG 1. The motor shall be of adequate wattage horsepower to
drive the equipment continuously at the maximum load encountered
under any operating condition without overloading or exceeding the
nameplate rating of the motor. Motor shall be suitable for
operation on [_____] volt, [_____] phase, [_____] Hertz service.
Motor shall be protected against overload, low voltage, and
unbalanced voltage. Motor shall be directly connected to the
speed reducer through a flexible coupling.
(2) Speed Reducer: Speed reducer shall be either a helical gear
reduction unit or a worm gear reduction unit fully enclosed in a
cast iron or fabricated steel case provided with dust and oil
seals with all gears running in oil and with anti-friction
bearings throughout. Drive motor shall be close-coupled to or on
the input shaft of the gear reduction unit, except that roller
chain drives or V-belt drives may be used between the drive motor
and the gear reduction unit. Gears used in speed reducer shall
conform to applicable requirements of the following AGMA
Standards. Speed reducer shall be designed with a minimum AGMA
service factor of 2.0 and shall also have an AGMA Service
Classification II.
Spur gearing and helical gearing: AGMA 908, AGMA 2001, AGMA 2004,
AGMA 6010, AGMA 6019, AGMA 6034, ASTM A 48M ASTM A 48, ASTM A 536,
Worm gearing:
AGMA 6019, AGMA 6034, ASTM A 536
(3) Bearings: Bearings incorporated within the drive assembly
shall be of the antifriction type and conform to the following
minimum schedule of rated-life expectancy (L-10) based on the ABMA
SBRB Standards when operating at the normal continuous torque
rating of the mechanism:
Worm gearbox bearings:
L10-100,000 hours
SECTION 11375N
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