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Blasting cap

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Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2012, May 28–30, 2012
Paper Number: ISRM-EUROCK-2012-039
... University of Technology, Luleå, Sweden Daniel Johansson Luleå University of Technology, Luleå, Sweden Abstract: Using blasting caps with electronic delay units, it has become possible to employ wave superposition in rock blasting. This paper presents computer simulations to investigate the hypothesis...
Proceedings Papers

Paper presented at the 20th U.S. Symposium on Rock Mechanics (USRMS), June 4–6, 1979
Paper Number: ARMA-79-0461
... of success predicted by the model potentially affect vibration and air blast control. INTRODUCTION From the time fuse-type delay blasting caps were introduced by Smith in 1895 (1), explosives users have realized that better fragmentation could be attained by using delay initiation instead...
Proceedings Papers

Paper presented at the ASSE Professional Development Conference and Exposition, June 25–28, 2000
Paper Number: ASSE-00-005
... detonators (electric blasting caps, non-electric blasting caps for use with safety fuse, and non-electric delay caps for use with detonating cord), detonating cords, detonating cord delay units, MS connectors, and devices for assembling and lighting “cap and fuse” units. All initiating devices are made...
Journal Articles
SPE J. 2 (03): 207–210.
Paper Number: SPE-324-PA
Published: 01 September 1962
.../2 and 1 1/8 in. in diameter, ended by a truncated cone, with the cone angles ranging from 45 degrees to 130 degrees. Upper cone face diameters were 1/2, 3/4, or 1 in. A small plastic-covered electric blasting cap detonated on the axis of the specimen produced the spherical shock wave. The detonators...
Proceedings Papers

Paper presented at the SPE Drilling and Rock Mechanics Conference, January 22–23, 1973
Paper Number: SPE-4245-MS
... in the United States and England as the Monroe effect. The lined cavity effect was discovered by accident in 1936 by R. W. Woods at the Physics Dept. of John Hopkins University. During the investigation of an accidental death caused by a blasting cap, Woods found that the dimple in the base of the cap extruded...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 2–5, 1994
Paper Number: OTC-7602-MS
... are covered to familiarize the reader with this technology, followed by a discussion of a complete EPI based initiation system. - - Wireline EFI Initiation System 5. The Inherent Sensitivity of Primary Explosives (i.e.: blasting caps) to heat, shock, & ESD. OTC7602 System Overview EPI Theory-of-Operation...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 4–7, 1992
Paper Number: SPE-24574-MS
... into two types: gravity and positive displacement. Figure 1 schematically shows these two types. Gravity bailers dump their contents by using an explosive blasting cap to shatter a frangible nose at the bottom of the bailer. The material then dumps by gravity, provided the density of the plugging material...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, September 23–26, 1990
Paper Number: SPE-20635-MS
... PERFORATING Introduction Wireline perforating guns are initiated by conventional heat-type electro-explosive devices (EED) which are usually electrical bridge wire-type detonators, commonly known as blasting caps. They are fired by electric current transmitted through the wireline, from the surface control...
Journal Articles
SPE J. 15 (03): 234–246.
Paper Number: SPE-5147-A
Published: 01 June 1975
...L.Z. Shuck; K-H Frohne; G.E. Rennick; D.M. Evans Experimental conditions, theoretical considerations, and results of adirectional acoustic-velocity survey in the plane of formation of an oilreservoir in Pennsylvania are given. More than 60 blasting-cap acoustic sourceswere discharged opposite...
Journal Articles
Trans. 210 (01): 11–18.
Paper Number: SPE-680-G
Published: 01 December 1957
... an accidental death resulting from an electric blasting cap. 1 12 1957 1 12 1957 1957. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired. specification mechanism velocity gradient jet specification order detonation...
Proceedings Papers

Paper presented at the The 4th U.S. Symposium on Rock Mechanics (USRMS), March 30–April 1, 1961
Paper Number: ARMA-61-137
... A & A A Fig. 2. Geometry of drop tests and tests with blasting caps for short beams. I I I I I 1 (A) O0 04 08 004 OO2 000 -0.02 00 04 08 I (o) -- 004 0 02 ooo -0.02 N = 563 -- O0 04 08 TIME (Milliseconds) Fig. 3. Effect of repeated drops N of small boll on beam (1 in.) response below breaking strain, w...
Images
Rotated P-Wave Arrival (Top) and Rotated S-Wave Arrival (Bottom) From 2 Fee...
Published: 03 October 1999
Figure 6 Rotated P-Wave Arrival (Top) and Rotated S-Wave Arrival (Bottom) From 2 Feet of Detonating Cord Set Off in an Offset Well a Distance of 800 Feet Away. Results from this noise study indicate that events with energy less than that of a blasting cap could be detected in the fractured gas cap... More
Proceedings Papers

Paper presented at the Offshore Technology Conference, April 30–May 2, 1972
Paper Number: OTC-1623-MS
... cords. The housing is latched around the tubular member and the elastic cords are stretched around the member to be cut and then connected to the housing. The detonating cord is then connected to the charge boosters (See Figure No.2). After the diver (or divers) is out of the water the blasting cap...
Proceedings Papers

Paper presented at the 1993 SEG Annual Meeting, September 26–30, 1993
Paper Number: SEG-1993-0507
... of high explosive detonated with a seismic blasting cap at the bottom of the shot hole filled with water. Data were collected by a 24 channel BISON GeoPro 8024 seismograph set with a 0.2 ms sampling rate, 192 ms record length, 75-1000 Hz bandpass and fixed gain settings. A total of 26 single-ended...
Proceedings Papers

Paper presented at the ISRM International Symposium - 5th Asian Rock Mechanics Symposium, November 24–26, 2008
Paper Number: ISRM-ARMS5-2008-114
... by penetration of energy concentration efflux (3) Communication of cracks caused by the action of stress wave Fig.2 Crack generated by the simultaneous initiation of several charges cord is initiated by two microsecond blasting caps, by which the central initiation is caused. The test results show that large...
Proceedings Papers

Paper presented at the ISRM International Symposium - 8th Asian Rock Mechanics Symposium, October 14–16, 2014
Paper Number: ISRM-ARMS8-2014-304
... and time Blasting conditions Measurement conditions Noise level (dB) Vibration velocity (kine) Vibration level (dB) Dominant frequency band(Hz) 16:40, October 2, 2013 DS Blasting cap 10-stage Max. simultaneous blasting amount 15.6kg Inside 52.9 0.063 48.8 160 Outside 48.9 0.015 37.6 100 14:03, October 3...
Proceedings Papers

Paper presented at the The 1st U.S. Symposium on Rock Mechanics (USRMS), April 23–25, 1956
Paper Number: ARMA-56-0213
... CUTT N P' I 12 MEASURING ROD SECTION END FmURZ 3. Measuring block details. MEASURING BLOCK SWEEP OSCILLOSCOPE START I IOOk. OHMS VERTICAL INPUT :470 ,OHMS STARTING k BLASTING CAP LEAD WIRES FmUR . 4. Schematic diagram. 218 QUARTERLY OF THE COLORADO SCHOOL OF MINES FIGURE 5. Typical record...
Journal Articles
J Pet Technol 35 (10): 1915–1922.
Paper Number: SPE-10997-PA
Published: 01 October 1983
... testing to identify and eliminate blasting uncertainties associated with ex- plosive products, blasting caps, initiating systems, and any other material or operational aspects of such a large- scale field operation. The blasting program was divided into three tasks to meet the three objectives. Task 1...
Journal Articles
J Pet Technol 19 (11): 1431–1436.
Paper Number: SPE-1715-PA
Published: 01 November 1967
.... 3,260 m/ second in a 2- X 3-ft triangle and 1,550 and 1,280 m/sec- ond in I- X 8-ft rectangular reservoirs. Failures experienced during this series of tests were at- tributed to electric blasting caps producing insufficient shock to initiate a detonation, According to ~oofc low- inierrsity shocks often...
Proceedings Papers

Paper presented at the ISRM International Symposium - 8th Asian Rock Mechanics Symposium, October 14–16, 2014
Paper Number: ISRM-ARMS8-2014-118
... method using an EDD blasting cap was applied to the section where the vibration velocity exceeded 0.25 kine when only DS blasting caps were used for the general blasting pattern. The mechanical excavation method was employed in the section where the vibration velocity exceeded 0.25 kine even...

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