NATIONAL ALUMINIUM COMPANY LIMITED - Rites

Nos (Total 4 Nos in the Crane ffor
or Long Travel motion) The Wheel shall be of forged steel
having composition as Cr 55 Mn 75 (EN 9) hardened to 300 300-350 350 BHN with minimum depth
10mm confirming SAE 1055 / IS 1570 & shall be fitted with roller bearings with dust proof
seals. For lubrication, Grease nipples shall be provided at convenient points.
Twin drive system to be adopted for Long Travel of E. O. T. in the bay.
One wheel in each carriage is to be driven by forged steel gears through a motor mounted
on or adjacent to the carriage.
Long travel mechanism shall be provided with, a thruster brake on each individual drive of
the track wheels. These brakes shall be such that it can be operated from both the control
desk as well as remote control. The brakes shall be of post type with hing hinged shoes, lined
with good quality reinforced bonded brake lining and suitable for easy of adjustment of the
wear on lining.
An independent additional mech. / electrical operating brake are to be provided with LT
motion to stop the crane immediately in ca case of power failure.
13.3 DATA SHEET
13.3.0 CAPACITY AND LEADING DIMENSION
13.3.1 Safe Working Load: Main Hoist - 25T
13.3.2 Safe Working Load: Aux. Hoist - 5T
13.3.3 Duty as per I.S.3177 (Latest Amendment)
13.3.4 SPEED OF MECHANISMS:
(a) Main hoist Hoisting / Lowering - 6 M/Min
(b) Aux. Hoist Hoisting / Lowering - 8 M/Min
(c) Cross Traverse (CT) Forward/ reverse - 10 M/Min
(d) Long Travel (LT) Left / Right - 30 M/Min
13.3.5 (a) Normal Span: Actual span & other dimensions as required as per structural steel
shed of wagon tippler shall be evaluated by the bidder and confirmed in the bid.
13.3.6 (b) RailCenter to Center: Bidder to confirm
13.3.7 Gantry Rail heights above floor level: Bidder to confirm
13.3.8 Hook lift above flo floor or level to be provided: Bidder to confirm depending upon actual
site condition
13.3.9 Type of Hook - Shank type
13.3.10 Available head height above rail top: to be confirmed by Bidder
13.3.11 Available side clearance from gantry rail center: Bidder to confirm
13.3.12 Location
Wagon tippler shed, Bay Length & Width: Bidder to confirm
13.3.13 Electric power supply - 415 Volt, 3 Phase, 50 HZ A.C. Supply
13.3.14 Gantry rail size - Bidder to confirm.
Technical Specification:Sec-4,System System Parameters, Operation & Control Philosophy
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