15---Tuesday---Ventilation Flashcards
How much air is required in a production panel with an auxillary fan? Answer what is required in the regs.
List the quantities required for the following fans?
A 21m3 fan
B 22m3 fan
C 23m3 fan
D 18m3 fan
The minimum quantity of air flowing in any panel with an operating air fan at the mine must be the sum of:
The open circuit capacity of each air fan in operation in the panel; and
30% of the open circuit capacity of the largest fan in operation in the panel
A 21m3 fan 27.3m3
B 22m3 fan 28.6m3
C 23m3 fan 29.9m3
D 18m3 fan 24.4m3
When can a person interfere with an auxillary fan?
3 things.
A person must not deal with a fan ventilating a place below ground at an underground mine unless the person:
Is the ERZ Controller for the place; or
Is authorised by the Ventilation Officer to interfere with the fan; or
Has been directed to interfere with the fan by the ERZ Controller for the place
What happens to the crews if the ventilation stops?
In the event of an air fan stoppage, all personnel working in the area being ventilated by the air fan are to evacuate to an area that is ventilated with primary ventilation (normally the last open cut-through), Flood ventilation
Prior to starting the air fan, the ERZ Controller is to?
list 4 Things
Notify each person likely to be affected.
The ERZ Controller is to inspect, with a PGD, the area that the air fan will be ventilating, taking note of the gas levels, vent tube run/end cap and vent tube rubbers. Adjust the vent tube run/end cap if required and fix vent tube rubbers.
NOTE: Monitor the PGD at all times while inspecting the area to be ventilated by the air fan. Do not enter an area with gas levels exceeding the statutory limits.
The ERZ Controller is to inspect the general body ventilation within 20 metres on both sides of the fan with a PGD to ensure less than 1.25% CH4.
Open up the degassing box
The ERZ Controller is to ensure that stone dusting arrangements are set-up at the fan if required.
What are the general alarm levels for gasses at cook colliery on the safegas system for ?
A–Conveyor Belt
B–4 tree sensors
Belt 6 ppm
It all depends on the ventilation quantities and where the belt is. Trunk / gatebelt
Air split Panels CO--4 - 8 ppm CO2-0.5%--1% CH4- 1.0 - 1.25% O2--19% 21.5%
Safe gas is high high preset value High preset value Normal level preset value Low preset value Low low preset value
What does TWA and STEL?
Time waited average
Short term exposure limit
What are the types of rescuers at Cook?
MSA 30 -100
30 mins walk
100 mins rest
SCSR 90
How do we convert ppm to %?
1% = 10,000 PPM
What are the consequences of bagging a fan off too tightly?
You can alter the ventilation elsewhere in the mine if its bagged off too tightly
You can knock down the bag stopping at the last cut through in the panel causing a short circuit.
What determines the size of the face wash zone?
Geology Extraction rates Gas volume Air quantity / pressure Velocity of ventilation
How do you test a kestrel?
You could be asked this in an oral
How to change kestrel readings?
Pick one up and gently blow into it
Explain how to do a spot reading.
What does a scrubber fan do, list one hazard?
It is controlled recirculation to remove dust.
It cleans the air and removes the dust from the air using water.
One of the hazards is it puts water onto the floor
How do you know if a crack is getting worse?
Push a wedge in by hand if it fall out later on in shift then its getting worse.
You are to shut down the district for 6 days what do you do?
Pull miner back to the last CT so it's in flood ventilation Bag off the fan 3/4 not to tight Check butterfly's on vent tubes Isolate the DCB Isolate the tranny--depends?? Document everything Account for all people in the district District board sign it Turn off the water conveyor shutdown inspection.
What are the gasses and the maximum levels we bump test the Drager XAM 5000 at cook?
CO. 40 ppm
CO2. 1.25%
CH4. 2.5%
O2. 21% sometimes we use 17 span gas
