WorksheetsBLASTING ACCESORIES
Total questions: 8
Worksheet time: 8mins
A long, thin core of specially prepared gunpowder wrapped in textile fabric, coated with varnish, waxes, and waterproof materials. Ignites gunpowder in a blasthole without needing a detonator; must be used with a plain detonator for high explosives. Burning rate: 100 seconds per meter. Not permitted in underground coal mines
(a)
The most common device for initiating an explosive charge. Contains a base charge of Pentaerythritol Tetranitrate (P.E.T.N) and a priming charge of A.S.A (lead azide, lead styphnate, and aluminium) in an aluminum or copper tube. Activated by heat or electric spark. Copper tube detonators are mandatory in underground coal mines
(a)
Useful when electric initiation is prohibited due to the risk of uncontrolled detonation from extraneous electricity. A tube partially filled with primary explosive, allowing insertion of a safety fuse. The safety fuse ignites the primary explosive, secured by crimping the mouth of the detonator.
(a)
It is identical to plain detonators but include a fuse head with a flashing composition. Tube made of aluminum or copper. Ignited by an electric current, initiating the priming and base charges almost instantaneously.
(a)
Provides sequential detonation of charges in a blasting round. Uses delay action detonation, with individual charges energized simultaneously but initiated with a delay. Metal tube filled with a chemical composition that burns at a uniform rate, determining the delay duration.
(a)
A flexible but strong continuous detonator that can be several hundred meters long. Provides simultaneous detonation of several interconnected blasthole charges. Ensures continuous initiation of the full length of explosive charge in a blasthole.
(a)
Used when electric firing is prohibited but accurate detonation is required. Special plastic tubing with an inner surface coated with reactive powder. Acts as both a detonator and a cord, but requires an external device to start.
(a)
Devices used to initiate electric detonators. Types vary depending on the number of electric detonators in the circuit (common ranges: 1, 6, 12, 30, 100). Must be of an approved type and intrinsically safe for underground use.
(a)
