DEtonation gas delivery unit

Patent · Tue Dec 04 04:00:00 EST 1984

OSTI ID:5952279

Emmett, G C

The detonation gas for gas-detonatable blasting charges used in surface mining and the like is supplied by a portable self-contained delivery unit connected to the blasting charges by a network of small flexible tubing, which unit blends pressurized fuel and oxidizing gases from separate supply sources in predetermined proportions and regulates the separate flows of such gases in response to the backpressure imposed by the tubing network to maintain such proportions in the gas blend delivered to the tubing network. The separate gas flows are controlled by servo-actuated flow control valves actuated by a control gas pressure which is applied or released in response to such backpressure. Preferably, the control gas pressure is regulated by a pair of pilot valves, one normally open and the other normally closed, connected in parallel between the servo actuators of such flow control valves and the control gas source and the atmosphere, respectively, the state of the pilot valves being reversed in response to the occurrence of a backpressure exceeding a predetermined maximum to disconnect the control gas from and release the existing gas pressure on the flow control valve servo actuators. A preferred safety feature assures complete filling of the tubing network before the gas therein can be ignited to initiate detonation of the explosive charges.

• Assignee: HL and AG Balsinger Inc.
• Patent Number(s): US 4485739
• OSTI ID: 5952279
• Country of Publication: United States
• Language: English

Related Subjects

45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
450100* -- Military Technology
Weaponry
& National Defense-- Chemical Explosions & Explosives
CHEMICAL EXPLOSIVES
COMMINUTION
CONTROL
CONTROL EQUIPMENT
DETONATIONS
DETONATORS
EQUIPMENT
EXPLOSIVE FRACTURING
EXPLOSIVES
FLOW REGULATORS
FLUID FLOW
FLUIDS
FRACTURING
FUELS
GAS FLOW
MINING
PORTABLE EQUIPMENT
PRESSURE CONTROL
PRESSURE EFFECTS
SERVOMECHANISMS
SURFACE MINING
VALVES
WORKING FLUIDS