Ammunition and explosives – Igniting devices and systems
Patent
1977-09-26
1979-07-17
Pendegrass, Verlin R.
Ammunition and explosives
Igniting devices and systems
102 24R, 149 43, 149 46, 149112, C06B 3128, C06B 3304, F42D 100, F42D 300
Patent
active
041611420
ABSTRACT:
A blasting booster comprises a rigid tube filled with a mixture, by weight, of about: 60% to 80% ammonium nitrate prills ground through a 1/16" screen; 12% to 35% whole ammonium nitrate prills and 3% to 8% diesel oil. Preferably the mixture includes about 0.4% to 10% aluminum fuel and the weight ratio of ground to whole prills is about 4 to 1. In use the booster tube is plastic lined and is placed in the bottom of a bore hole which is filled with AN-FO or an appropriate blasting agent. A one-pound cast primer on top of the booster is detonated to initiate the booster and the AN-FO, whereby detonation velocities and pressures in excess of non-boosted AN-FO, for example, are achieved in the critical bottom three feet of the bore hole. Bore hole patterns, where the booster is used, are expanded over tighter patterns required for non-boosted AN-FO alone, and drilling costs are significantly reduced.
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patent: 3046888 (1962-07-01), Gordon
patent: 3111437 (1963-11-01), Hino et al.
patent: 3305414 (1967-02-01), Hodgson
patent: 3394038 (1968-07-01), Minnick et al.
patent: 3534685 (1970-10-01), Romocki et al.
patent: 3760728 (1973-09-01), McKee et al.
patent: 3781180 (1973-12-01), Harrison et al.
Edwards Donald W.
Wells, Jr. Luther R.
Pendegrass Verlin R.
Southern Explosives Corporation
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