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25-09-2010, 04:06 PM
Auxiliary ventilation.ppt (Size: 1.36 MB / Downloads: 70) This article is presented by:
Dr. P. S. Paul
Dept. of Mining Engineering
Indian School of Mines University, Dhanbad
Tunnels or drifts are essentially blind headings till they are connected to shafts or adits thus posing a real challenge to ventilation engineers.
The work place environment in tunnels is greatly influenced by the ventilation method, selection of proper fan and duct apart from cost of ventilation
This is simply a sheet or sheets of canvas commonly made out of treated hessian cloth nailed on to props placed at 1 to 1.5 interval along the heading to prevent the short circuit of air from intake to return, so causing the ventilation air to reach the faces. It may be used:
As a screen across an airway to prevent or reduce the flow of air along it.
As a partition along the roadway to devide it into two parts intake an return.
Condition of using Line Brattice:
1. Brattice Cloth coated with P.V.C. is impermeable to airflow, and is more suitable for line brattice to ventilate a heading.
2.This can be used only for a short distance (not more than 20m long) into the heading due to heavy air leakage
3.The intake side of a brattice should be kept wider than its return side. The wider intake will help to circulate adequate quantity of fresh and cool air for the miners at face as well as will faciate easy movement of the men and machineries through it.