Borehole stemming with a column of liquefiable and/or vaporizabl

Details Borehole stemming with a column of liquefiable and/or vaporizabl Borehole stemming with a column of liquefiable and/or vaporizabl

1984-09-20

1986-05-06

Nelson, Peter A.

Ammunition and explosives

Blasting

Borehole loading

102312, 102333, 86 20C, 299 13, 166302, F42B 300

Patent

active

045864381

ABSTRACT:
To prevent the rapid escape of high-pressure explosion gases when an explosive charge is initiated in a borehole, the hole is stemmed with chunks of readily liquefiable and/or vaporizable solid material, preferably chunks of ice and/or chunks of dry ice, piled up one upon the other so as to form a columnar bed of pre-solidified stemming material. The column remains in place during the explosion, and thereafter disappears by melting and/or subliming on absorbing heat from the surrounding formation. A preferred stemming column comprises a combination of ice chunks and chunks of dry ice, e.g., wherein the ratio of dry ice to ice in the column decreases with distance from the explosive charge.

REFERENCES:
patent: 2707436 (1955-05-01), McCool
patent: 3952655 (1976-04-01), Kusakabe et al.
patent: 3978921 (1976-09-01), Ross
patent: 4010810 (1977-03-01), Ross
patent: 4071099 (1978-01-01), Hensel, Jr.
patent: 4241592 (1980-12-01), Tapphorn
patent: 4295760 (1981-10-01), Warner

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