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Diode cutoff and safe packaging method for textile detonating cord

a technology of detonating cord and cutoff point, which is applied in the direction of transportation and packaging, packaging goods type, containers, etc., can solve the problems of high labor intensity in the packaging of detonating cord using this method, the material and labor costs of the resultant product are high, and the regulations governing the air shipment of explosives are quite stringen

Inactive Publication Date: 2005-02-24
DETOTEC NORTH AMERICA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The invention relates to a method for packaging detonating cord to allow for commercial air shipment. The method avoids the need for a separate severing means and instead relies on the detonation properties of the cord to sever itself. The detonating cord is packaged in a way that prevents detonation in one container and allows for a safe distance between detonation events. The invention also includes an explosive diode that restricts the propagation of detonation to one direction only."

Problems solved by technology

However the regulations governing the shipment of explosives by air are quite stringent.
Packaging of detonating cord using this method is quite laborious and involves inserting severing means around the cord and cable ties to anchor the cord in position.
Also since no separate severing means is required, there will be a resultant material and labor costs.

Method used

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  • Diode cutoff and safe packaging method for textile detonating cord
  • Diode cutoff and safe packaging method for textile detonating cord
  • Diode cutoff and safe packaging method for textile detonating cord

Examples

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Embodiment Construction

[0017] A diode cutoff block is shown in FIG. 1. In this drawing, the diode cutoff block (10) is shown. The block has two through holes 16, 16 for detonating cord and a channel through the block for focusing the air blast of the detonating cord. Detonating cord (12) passes through the diode block (10) and then forms a loop (14) before the cord passes through the diode block in the opposite direction. The diode block functions by focusing the air blast of the detonating cord through the block and severing the adjacent detonating cord section. The length of the loop (14) must be selected to allow the air blast to sever the adjacent detonating cord before the detonation wave can travel around the loop and pass through the block again.

[0018] The block can be made out of a variety of materials such as metal, wood, or plastic. From a cost and weight standpoint, the preferred material is usually plastic. The dimensions of the block are determined by the quantity of explosive loading in the...

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PUM

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Abstract

A block molded from a polymeric material has a through passageway to contain a percussive shock wave. Angularly related channels communicate with the containment passageway for receiving arcuate segments of detonation cord. Alignment of a plurality of blocks provides a convenient packaging setup for the cord. A percussive signal traveling along the cord can be short-circuited in the packaging setup. A diode version of the block can react to the signal in a given direction of travel.

Description

FIELD OF THE INVENTION [0001] The invention relates to the transporting of textile sheathed detonating cord and more particularly to methods used in the packaging of textile detonating cord to achieve a shipping classification allowing shipment of the detonating cord by commercial aircraft. Also the invention relates to the design of an explosive diode to restrict detonation transfer to one direction only. BACKGROUND OF THE INVENTION [0002] Detonating cords typically contain a secondary high explosive core encased in an outer textile sheath and plastic jacket. Typical explosive materials used are PETN, RDX, HMX, HNS, and PYX. These textile wrapped detonating cords are used extensively in the petroleum exploration and production industry to initiate other explosive components used in various downhole tools. The textile wrapping provides a highly flexible structure that can be easily threaded through perforating guns. Some examples of components that textile detonating cords are used ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F42B39/14F42B39/30
CPCF42B39/14H01L2924/01006H01L2924/01005F42B39/30F42D1/042
Inventor O'BRIEN, JOHN P.O'BRIEN, TIMOTHY J.
Owner DETOTEC NORTH AMERICA
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