NATIONAL ALUMINIUM COMPANY LIMITED - Rites

supports, pumps, tanks, etc. as required for the satisfactory operation of dust control,
service water & potable water systems shall be furnished by the Contractor.
16.4 Codes and Standards
The design, manufacture, inspection and testing of Dust Co Control ntrol & Miscellaneous Systems
shall comply with all the currently applicable statutes, regulations and safety codes in the
locality where the equipment is to be installed. The Dust Control & Miscellaneous Systems
shall conform to the latest edition of the following standards and codes. Other
internationally acceptable standards/codes, which ensure equal or higher performance than
those specified, shall also be accepted. Nothing in this specification shall be construed to
relieve the contractor of the requir required ed statutory responsibility. In case of any conflict in the
standard and this specification, the decision of the Owner Owner/RITES shall be final and binding.
• IS:778 : Gun Metal gate, globe & check valves for general purpose.
• IS:780 :Sluice valves for water work works purposes (50 to 300 mm)
• IS:1239 : Mild Steel tubes & fittings.
• IS:2379 :Colour for the identification of pipe line.
• IS:2906 :Sluice valves for water work purposes.
• IS:3589 :Electrically welded steel pipes for water, gas & sewage (200 to 2000 mm)
• IS:5312 : Swing check type reflux (non return) valves.
• IS:1520 : Horizontal centrifugal pump for clean, cold fresh water.
• IS:5120 :Centrifugal pump for clean, cold & fresh water.
• ANSI B 31.1:Code for pressure piping.
• Hydraulic institute Standards of U.S.A.
16.5 DESIGN REQUIREMENT
Plain Water Dust Suppression
16.5.1 At specified locations dust suppression system shall be provided which comprises spray
nozzles discharging plain water in a fine spray to capture air borne dust particles and direct
them into the main in coal flow. Water shall be discharged via a pipe work system through
spray heads at the dust suppression zones.
16.5.2 Water shall be drawn from the water storage tank by 2x100% electric motor driven pumps
and discharged into tank from where 2x100% dut duty y electric motor driven pumps shall
discharge the water via a pipe network system through spray heads at the dust suppression
zones. Solenoid valves shall be provided for open/close control of water line to each spray
head. Each spray head shall consist of minimum 4 nos. nozzles. Spray heads shall be
provided at coal loading and receipt zone. Pressure at inlet to spray head shall not be less
than 2.5 Kg/sq.cm(g).
16.5.3 The dust suppression system over the WT hopper shall have a canopy on which fogging
nozzles zzles are fixed at specified distance. Each nozzle header shall be provided with adequate
number of spray nozzles spaced at 500 mm interval so that the entire length & width of the
wagon tippler hopper are covered by a grid of nozzles. Further, the water s sspray
shall be of
Technical Specification:Sec-4,System System Parameters, Operation & Control Philosophy
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