16---Wednesday---Oral Questions 2---updated 1st Feb 2016 Flashcards
How can you tell weight is coming on the roof?
List 4 identifiers
Guttering along the rib side on the roof Ribs
fretting
Roof cracking
Stone and or dust falling from the roof
Roof washers plates bending
Tell tales indicating
A miner is having problems with long tails on bolts only on his side? What could be the problems?
Check pressures on bolter is it just this bolter is it under pressure cracks shear pin at 7 tonne Swap over operators to see if the long tails goes with operator on the other side of the machine Check the drill steel make sure the are no extensions fitted Chemicals out of date Blunt tip on steel Wrong size tip Partings in the roof Right bolts Right chemicals Sunny side up Spin and hold times Drill rig chain guide rail not adjusted correctly
How do fans work tell me about barometric pressures with seals and why they are important
Fans create a low pressure at the fan and this causes a pressure differential and air moves from high pressure to low pressure Barometric pressure is similar air will move from high pressure to low pressure, this affects goafs as pressure rises goafs breath in and as the pressure fall the goaf breaths out.
With respect to a long wall describe the term uni di and bi di
Uni di - shears the coal face and cuts leaving a bench takes 2 runs to shear the coal face Bi di - shears the coal face in one go
What are the minimum and maximum water pressures for the mine to operate?
1750 Kpa 250 psi 480 Kpa 69psi
What are the ventilation requirements required for the two fans to operate in a panel as per the regulations.
18m3
22m3
- 18 m3—23.4m3
- 22 m3— 28.6m3
List the parts of the sop for explosives?
Storing use transport handling disposal
Scrubber fans how often are they cleaned?
Once a shift or as required
On the joy miner list the type of drill system?
HfX
Signs of outburst list 5 of them
Increased gas make Coal spitting from the face Change in cleat direction fault coming up Change in composition Mylonite
What do you do at the end of the shift?
Turn off the water to the panel.
What is a permit to mine, and what do you expect to see on it?
- A section of the mine before mining
- Geological Features faults throws
- Structures
- dykes
- bore holes sealed or open or cemented
- Bin notice issued with it
- outburst threshold
- mining sequence
- scale
- survey control coment
- Signatures geologist survey mine manager ventilation officer
- other seam workings ghousted cook have caster 14m to 22 above argo
- support codes roof and rib
- *
What is the difference of draining CH4 and Draining CO2?
CO2 is is bigger module so it is harder to Drain.
A- Draw Ellicots diagram and name the quadrants.?
B- If you didnt have inertisation where would a seal trend for a high CH4 mine?
C- Where would it trend if we had inertisation?
Draw the Fire Ladder and list the temperatures as the gasses are produced?
Draw the evolution of gasses Chart to be able to explain spontaneous combustion?
