NATIONAL ALUMINIUM COMPANY LIMITED - Rites

12.4 DATA SHEET: DRIVE EQUIPMENT
GENERAL
12.4.1 Continuous Motor Rating (Name Plate Rating) at 50 Degree Centigrade Ambient temp. for
Electric Motors
a) For conveyors of belt conveyor systems and belt for In line magnetic separator:
*120% 120% of actual power at drive motor output shaft at specified design capacity
b) WT, SAC, apron feeders: *110% 110% of actual power requirement at drive motor output
shaft at guaranteed (rated) capacity.
c) Mono-rail rail hoists (travel and hoisting), various pumps of DS systems, service water
systems, cooling water system, potable water system and sump pumps: *110% of
actual power requirement at drive motor output shaft at guaranteed (rated)
capacity.
d) Ventilation Fans: *110% 110% of actual power requirement at drive motor output shaft at
guaranteed (rated) capacity. In case of belt drive, the efficiency of transmission shall
be considered as 95%.
*The The actual power at drive motor output shaf shaft t shall be calculated after considering all the
losses of down the line equipment’s of the drive train.
1.0 Drive Equipment Rating
a) For Conveyors : 120% of actual design requirement
b) Other Equipment 1 x 100 % duty: 120% of actual design requirement
c) ) Other Equipment 2 x 50 % duty: 110 % of actual design requirement
2.0 DESIGN & CONSTRUCTION REQUIREMENT
2.1.0 Gear Box
2.1.1 Type
(a) Below 40 KW: Helical, worm, bevel as per requirement without cooling coil
(b) Above 40 KW: Helical / bevel helical wwithout
cooling coil
2.1.2 Service Factor: As per accepted engineering practice / manufacturer's
recommendations
2.1.3 Ambient temperature for Thermal rating: 50
2.1.4 Mounting: On Machined/Ground Surfaces
2.1.5 Output Rating:
a) For belt conveyor systems
requirement at drive pulley shaft at design capacity}
b) For other equipment
of the driven equipment }
@ Service factor shall include all the components considered by the supplier and should be
clearly indicated in manufacturer’s gear box selection catalogues.
o 2.1.2 Service Factor: As per accepted engineering practice / manufacturer's
C Minimum
2.1.4 Mounting: On Machined/Ground Surfaces
a) For belt conveyor systems @ Service factor X {1.2 times the actual power
requirement at drive pulley shaft at design capacity}
b) For other equipment @ Service factor X {1.2 times the actual power requirement
of the driven equipment }
shall include all the components considered by the supplier and should be
clearly indicated in manufacturer’s gear box selection catalogues.
2.1.6 Duty: 24 Hrs. Continuous
2.2.0 Flexible Couplings:
2.2.1 Type: Geared capacity.
2.2.2 Rating: Not less than han motor rating.
Technical Specification:Sec-4,System System Parameters, Operation & Control Philosophy
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