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Title: Bonfire-safe low-voltage detonator

Abstract

A column of explosive in a low-voltage detonator which makes it bonfire-safe includes a first layer of an explosive charge of CP, or a primary explosive, and a second layer of a secondary organic explosive charge, such as PETN, which has a degradation temperature lower than the autoignition temperature of the CP or primary explosives. The first layer is composed of a pair of increments disposed in a bore of a housing of the detonator in an ignition region of the explosive column and adjacent to and in contact with an electrical ignition device at one end of the bore. The second layer is composed of a plurality of increments disposed in the housing bore in a transition region of the explosive column next to and in contact with the first layer on a side opposite from the ignition device. The first layer is loaded under a sufficient high pressure, 25 to 40 kpsi, to achieve ignition, whereas the second layer is loaded under a sufficient low pressure, about 10 kpsi, to allow occurrence of DDT. Each increment of the first and second layers has an axial length-to-diameter ratio of one-half.

Inventors:
 [1]
  1. (Albuquerque, NM)
Issue Date:
Research Org.:
AT & T CORP
OSTI Identifier:
867293
Patent Number(s):
4907509
Assignee:
United States of America as represented by United States (Washington, DC) SNL
DOE Contract Number:  
AC04-76DP00789
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
bonfire-safe; low-voltage; detonator; column; explosive; makes; layer; charge; cp; primary; secondary; organic; petn; degradation; temperature; autoignition; explosives; composed; pair; increments; disposed; bore; housing; ignition; region; adjacent; contact; electrical; device; plurality; transition; opposite; loaded; sufficient; pressure; 25; 40; kpsi; achieve; 10; allow; occurrence; ddt; increment; layers; axial; length-to-diameter; ratio; one-half; axial length; ignition temperature; explosive charge; ignition device; transition region; diameter ratio; electrical ignition; ignition region; low-voltage detonator; degradation temperature; organic explosive; /102/

Citation Formats

Lieberman, Morton L. Bonfire-safe low-voltage detonator. United States: N. p., 1990. Web.
Lieberman, Morton L. Bonfire-safe low-voltage detonator. United States.
Lieberman, Morton L. Mon . "Bonfire-safe low-voltage detonator". United States. https://www.osti.gov/servlets/purl/867293.
@article{osti_867293,
title = {Bonfire-safe low-voltage detonator},
author = {Lieberman, Morton L.},
abstractNote = {A column of explosive in a low-voltage detonator which makes it bonfire-safe includes a first layer of an explosive charge of CP, or a primary explosive, and a second layer of a secondary organic explosive charge, such as PETN, which has a degradation temperature lower than the autoignition temperature of the CP or primary explosives. The first layer is composed of a pair of increments disposed in a bore of a housing of the detonator in an ignition region of the explosive column and adjacent to and in contact with an electrical ignition device at one end of the bore. The second layer is composed of a plurality of increments disposed in the housing bore in a transition region of the explosive column next to and in contact with the first layer on a side opposite from the ignition device. The first layer is loaded under a sufficient high pressure, 25 to 40 kpsi, to achieve ignition, whereas the second layer is loaded under a sufficient low pressure, about 10 kpsi, to allow occurrence of DDT. Each increment of the first and second layers has an axial length-to-diameter ratio of one-half.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1990},
month = {1}
}

Patent:

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