Ammunition and explosives – Blasting – Borehole loading
Patent
1991-06-13
1992-03-31
Lechert, Jr., Stephen J.
Ammunition and explosives
Blasting
Borehole loading
86 2015, 149 2, 149 21, F42G 300
Patent
active
050997637
ABSTRACT:
A blasting agent is disclosed for use in a borehole having a pressure resistant closure. The blasting agent is used in combination with a primary initiating system comprised of a detonator and an initiator for the detonator. The blasting agent is preferably a semi-fluid explosive material having a predetermined sensitivity. The sensitivity is related to the borehole diameter and the initiating system's strength, wherein the blasting agent upon initiation is transformed into explosive products by means of reaction front which consumes substantially all the blasting agent as the reaction front passes through the blasting agent. The reaction front has an average velocity of propagation of beween 200 meters/second and 1,000 meters/second for at least 30% of the total length of blasting agent located in the borehole. Another aspect of the invention is a method of blasting wherein the average velocity of propagation of the explosive front in the blasting agent is in a range of between 200 m/sec and 1,000 m/sec.
REFERENCES:
patent: 4757764 (1988-07-01), Thureson et al.
patent: 4864933 (1989-09-01), Kusov et al.
Coursen David L.
Flinchum Rufus E.
ETI Explosive Technologies International
Lechert Jr. Stephen J.
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