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
Shock Tube: Avoiding unplanned energy release on the stope face
30 September 2014
WealthUnearthed
Agenda
What is unplanned energy release?
Unintentional detonation: Blast incidents
Non detonation
Incorrect timing
Product compatibility
Where does the Uni-delay come from?
Finally
Finally
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
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
Impact Tests
Questions, Myths and Comments.
At what impact will shock tube detonate?
What is snap and shoot?
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
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?
Reverse propagation Test
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
Significant difference
Vivid
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
Shock Tube is too fast and damages my hanging wall.
200ms out-hole delay (Time between shots)
Timing?
Reverse Timing
Blast model to be put in here
FOG`s in South African Mines
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
Explosives related fires in the mining industry
Questions posed up front
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
Shock Tube: Avoiding unplanned Energy Release in the Stope Face30 September 2014
Thank You