Specifications

Enquiry Specification for Wagon Tippler with Side Arm Charger and Associated works

NRO/CON/WT/533

EPI – New Delhi Volume-2B, Rev.0 Page 11 of 63

4.0 DUST SUPPRESSION SYSTEM

The scope of work of dust suppression system includes:

(a) Plain water dust suppression (DS) system of wagon tippler hopper, track

hopper & stock piles.

(b) Plain water dust suppression system for plough feeders of track hoppers.

The dust suppression system shall be integral part of the plough feeders

and shall be captive unit of these mobile equipment.

Separate set pump (1W+1S) & water tank shall be provided for dust

suppression system of each plough feeder.

different junction houses, hoppers/bunker/bin buildings and other dust

areas.

(A) Applicable Codes And Standards

The execution of the work covered under this specification shall conform to the

latest Indian Standards specification where the same are available or the

reputed standards acceptable to the owner / consultant. In case such

specifications are not available, the work shall be according to good engineering

practice and norms acceptable to owner / consultant.

(B) Design Criteria

(1) Work zone dust concentration shall be less than 5 mg/Nm3 (at 5m to 7 m

distance from source) above ambient level .

(2) Water line velocity shall be maintained less than 1.5 m/sec. Water pipe line

shall be supported at regular interval. Make-up water, quick fill, drains and

overflow connection shall be included at pump station tank. Duplex strainer

shall be included at inlet to dust suppression system pumps. IS-1239 heavy

class, ERW, G.I pipe line ( for size up to 150 NB) shall be used in the water line.

The pipes above 150 NB shall be MS, spirally welded, 6 mm thick & conforming

to IS:3589. Water pipe line shall be preferably be laid over ground along

conveyor gallery. In case of non-availability of same suitable supporting

scheme shall be provided to suit site. Underground pipeline (wherever

provided) shall have wrapping and coating as per IS – 10221 (preferably

wrapping coating shall be coal tar based). Hume pipe protection shall be laid at

road crossing area.

(3) IS-1239 heavy class, ERW, G.I pipe line shall be used in the compressed air

line. Compressed air pipeline network over ground laying shall be preferred

with a minimum slope of 10 mm in 1m (1: 100) along flow and moisture trap

with drain provision at regular interval. Compressed air pipeline shall be

preferably laid along conveyor gallery or can be supported from building

supporting structure. In case of non-availability of same suitable supporting

scheme to be developed by the Bidder to suit site.

(4) In wagon tippler , spray nozzles shall be arranged in three rows, at both side of

hopper and top of hopper to cover the entire hopper. Water spray in each group

of nozzles shall be through solenoid valve. The operation (open/ close) of