ch.4 safety in drilling & blasting

7/29/2019 Ch.4 Safety in Drilling & Blasting

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DRILLING & BLASTING Rock blasting is the controlled use of explosives and

other methods to excavate, break down or remove rockIt is practiced most often in mining, quarrying andcivil engineering such as dam, tunnel or roadconstruction.


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TRANSPORTATION OF EXPLOSIVES Important considerations:

Mode of transport

Handling for transportation

Traffic on road & road conditions


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PRECAUTIONS:

TRANSPORTATION OF EXPLOSIVES To be transported in specially designed vehicle. Special sign on vehicle DANGER EXPLOSIVE.

Vehicle should be in good working condition.

Non Sparking metal floor e.g. copper & brass.

Fully insulated electrical wire in the vehicle.

At least two fire extinguisher of carbon tetrachloride.

No metal except approved metal truck bodies shouldbe allowed to come in contact of explosives.

Metal, flammable & corrosive substances shall not betransported with explosives.


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PRECAUTIONS:

TRANSPORTATION OF EXPLOSIVES Smoking should be prohibited in the vehicle.

No unauthorized person.

Loading & unloading by trained staff only &supervised by qualified personal.

Traffic to be regulated while carrying explosives.

Speed of explosive van.

Safe distance with other vehicles.

If explosives are not properly placed on the vehicles,speed breakers & bad roads may be proved danger.


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HANDLING OF EXPLOSIVES Dynamite may cause headaches, & severity is more

with unwrapped dynamite.

Person handling dynamite should not smoke. He also should not carry any match box.

Safety instruction by manufacturer comes with supplyof dynamite, same should be followed.


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STORAGE OF EXPLOSIVES Storage of explosives is regulated by

INDIAN EXPLOSIVE ACT, 1884

Accidental detonation during storage of explosive maybe caused due to following reasons:

Use of unsuitable rooms.

Unsystematic control of wiring systems, fire alarm

systems, store closing devices & stay currents. Careless handling, unwrapping & distribution of

explosives.


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STORAGE OF EXPLOSIVES Explosives should be placed in dried & intermediate

layers, well ventilated and protected from the water.

Minimum distance of 100 M fro shafts & 20 M from

electrical/Mechanical devices.Area surrounding to be free from inflammable debris.

Separate compartment for detonators.

Boxes with explosive should never be stored in a storebut at least 15 M away from it.

Entry of store should be restricted.

Only authorized workers should work in the store.


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HAZARDS WITH USE OF EXPLOSIVE Causes of accident:

Faulty Loading of blast holes.

Failure to withdraw fast enough from the blast area. Returning to blasting points too soon after firing.

Presence of strangers near blasting point.

Premature detonation or misfire.


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PRECAUTIONS AT BLASTING SITE Basic Precautions Blasting Sites.

Drilling & Blasting. Shot Firing.

Electrical circuit.

Safety fuse.

Precautions before and after firing


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DISPOSAL OF EXPLOSIVES Due to wrong estimation, quantity procured may be in

excess of the requirement.

Excess quantity can not be diverted to any otherproject.

Excess explosive should be destroyed strictly accordingto approved methods in consultation with supplier or

manufacturer or appropriate authority. Explosives, empty cartridges, boxes and other material

used in packing of explosives should not be left lyingaround.


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DISPOSAL OF EXPLOSIVES It should be destroyed and burnt at an isolated

location in the open,

No person will be allowed to near to location ofburning, once burning starts. Minimum distance is33 M.


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DOS & DONTS FOE EXPLOSIVES Transportation of explosives. Storing Explosives. Using Explosives.

Preparing the Primer. Drilling & Loading. Shooting Electrically. Shooting with Fuse. Underground work. Before & After Firing. Explosive disposal. Applicable to seismic prospecting.


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ch.4 safety in drilling & blasting

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