NATIONAL ALUMINIUM COMPANY LIMITED - Rites

(i) Forces due to difference in frictional resistance of top and return idle rollers of
conveyor.
(ii) Forces due to inertia of rollers at the time of starting of conveyor belt.
(iii) Break down load caused by snapping of bbelt
elt (in case of multiple conveyors,
snapping of one belt at a time) shall be considered.
(iv) Special loads if any
f) Gallery girders and floor shall be designed for the following live loads,inclusive of
spillage loads on floors.
i) Walkway/Supporting beams for floor - 4.0 KN/m²
ii Under the conveyor belt - 0.75 KN/m²
iii) Gallery girder, for floor load of - 3.0 KN/m²
g) Dust load on roof of junction house and conveyor galleries shall be considered as
follows:
i. For building and structures located at a distance of 300m from the dust
producing units - 0.5 KN/m²
ii. At a distance of 300 m to 800 m from the dust producing unit - 0.25 KN/m²
h) As per technological requirements, provision of supporting the following, and load
arising thereof shall be considered in the design of conveyor gallery.
i) Ventilation duct.
ii) Electrical cables/cable racks.
iii) Fire Fighting equipment.
i) Junction house floors shall be designed for the following loads:
i) Live load on floor - 5.0 KN/m²
ii) Tension from conveyor belt
ii) Load due e to equipment located on floor.
iv) Load due to jamming of chutes.
v) Erection loads anywhere on the floor.
j) Combination of loads
The various loads specified shall be combined in accordance with clause 8.0 of IS: 875
(Part-5)-1987 1987 to give the most severe loading condition for design of structures.
k) Stress enhancements
Permissible limits of stress may be increased, wherever permissible, in accordance with
IS:800-1984.
18.5 Limiting deflection
a. The deflection shall be limited in various elements of structures in accordance with
clause 3.13 IS: 800-1984. 1984.
b. In addition following limitation in deflection shall be observed in design:
Technical Specification:Sec-4,System System Parameters, Operation & Control Philosophy
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