Shock Tube: Avoiding unplanned energy release on the stope face - Handjies
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Transcript of Shock Tube: Avoiding unplanned energy release on the stope face - Handjies
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Shock Tube: Avoiding unplanned energy release on the stope face
30 September 2014
WealthUnearthed
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Agenda
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What is unplanned energy release?
Unintentional detonation: Blast incidents
Non detonation
Incorrect timing
Product compatibility
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Where does the Uni-delay come from?
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Finally
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Finally
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Questions, Myths and Comments.
At what impact will shock tube detonate?
What is snap and shoot?
Can I detonate an In hole detonator by detonating the Out hole detonator?
It is difficult to detect misfired Shock Tube
Shock Tube is too fast and damages my hanging wall
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Questions, Myths and Comments.
At what impact will shock tube detonate?
40 Joules for a typical shock tube detonator under the perfect impact conditions
Fall Hammer Test
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Impact Tests
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Questions, Myths and Comments.
At what impact will shock tube detonate?
What is snap and shoot?
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Myth:
Snap and shoot does NOT exist
What really happens………
AEL`s experience:
• In the field – Not ever experienced
• In the factory – coiling during extrusion
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Questions, Myths and Comments.
At what impact will shock tube detonate?
What is snap and shoot?
Can I detonate an In hole detonator by detonating the Out hole detonator?
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Reverse propagation Test
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Questions, Myths and Comments.
At what impact will shock tube detonate?
What is snap and shoot?
Can I detonate an In hole detonator by detonating the Out hole detonator?
It is difficult to detect misfired Shock Tube
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Significant difference
Vivid
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Questions, Myths and Comments.
At what impact will shock tube detonate?
What is snap and shoot?
Can I detonate an In hole detonator by detonating the Out hole detonator?
It is difficult to detect misfired Shock Tube
Shock Tube is too fast and damages my hanging wall
![Page 17: Shock Tube: Avoiding unplanned energy release on the stope face - Handjies](https://reader034.fdocuments.net/reader034/viewer/2022051112/5594287a1a28abf5408b4644/html5/thumbnails/17.jpg)
Shock Tube is too fast and damages my hanging wall.
200ms out-hole delay (Time between shots)
Timing?
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Reverse Timing
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Blast model to be put in here
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FOG`s in South African Mines
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Falls of Ground vs Shock Tube growth
1092
950
779
833
720
655621
526
86 7656 64 48 39 25 32
0
200
400
600
800
1000
1200
0
20000000
40000000
60000000
80000000
100000000
120000000
140000000
160000000
180000000
2006 2007 2008 2009 2010 2011 2012 2013
Shock tube units Injuries Fataities
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Explosives related fires in the mining industry
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Questions posed up front
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References and acknowledgements
Derek Nel – Product Manager AEL Shock Tube Products
DMR – Annual Reports
Christo de Klerk – RTS
Simon Tose – AEL
Sandy Etchells - AEL
Mauritz Kotze - AEL
Andries Botha – AEL
My Team in the Free State
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Shock Tube: Avoiding unplanned Energy Release in the Stope Face30 September 2014
Thank You
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