NATIONAL ALUMINIUM COMPANY LIMITED - Rites

impregnated tar felt. The lap joint of the felt shall be generally touched with heavy duty
bitumastic paint.
16.7 DATA SHEET : DUST CONTROL & MISCELLANEOUS SYSTEM
1.0 GENERAL
1.1 Dust Control: Plain water dust suppression
1.2 Miscellaneous systems: Service water system, Potable water system, Cooling water
system & Sump pumps.
2.0 DESIGN REQUIREMENT
2.1 Dust Suppression
2.1.1 Operation: ration: Water sprayed through nozzles.
2.1.2 Pumps: 2x100% for water
2.1.3 Spray Head
(i) Minimum No. of nozzles per spray head: 4 (Four)
(ii) Pressure at inlet: Minimum 2.5 kg/sq. cm
2.2.0 Plain Water Dust Suppression
2.2.1 Pumps: 2x100% electric motor driven
2.2.2 Minimum Pressure at inlet of spray nozzles: 2.5 kg/sq. cm
2.2.3 Nozzle spacing on WT Top: 500 mm
2.2.4 Nozzles: Fogging type
2.2.5 Flow from each nozzle: 2.0 Lpm
2.3.0 Sumps Pumps
(i) Type: 2x100% electric motor driven
(ii) Capacity: 50 cub.m/hr minimum with 10% margin
(iii) Head: 20% margin on computed head
2.3.1 Drain Pits: Minimum 2x2x2.5 mts. and 1 No. settling pit for slurry & high/low level
switches in drain pit.
2.3.2 Piping: To nearest plant drain
2.4.0 Service ice Water System
2.4.1 Water connections
(a) Conveyor Galleries and tunnels: every 50 m
(b) Transfer points: Min. 1 no. at every floor
2.4.2 Connection details: 1 No. 32 NB globe valve & quick coupling
2.4.3 Hose pipes with hose reel: One in each building of 25 mtr. Length with nozzle
Technical Specification:Sec-4,System System Parameters, Operation & Control Philosophy
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