Bad Air, Bottom of Dig.

[Peter Burgess]

Pumping air down into a pit full of CO2 is about as useful as blowing bubbles into water to help a diver. Sucking out from the bottom and discharging well away form the dig will allow fresh air to replace the removed foul air. That is more like pumping out the water to help a diver.

 

[ah147]

All this talk of pumping the CO2 away....that's heading straight for me...I'm coming for you Tommy


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[bograt]

I am thinking of ventura's at 100 PSI.

 

[Speleokitty1]

Blowing is actually quite effective and generally easier than trying to suck out the CO2 as the latter requires rigid ducting. If its near the surface then a leaf blower and layflat plastic tubing will sort out the problem. If further underground then you need to think about electric or manually powered blower. What you do need is volume.

One dig at a mine in Derbyshire used layflat tubing and a blower powered by a small waterwheel for ventilation during the 1980's.

 

[maxf]

Recently some divers decompressing in habitats have been using small fan driven co2 scrubbers.

Basicly a tube filled with sofnolime (co2 absorbent) granules with a fan at one end drawing the gas through.

This could be a good solution in remote dig sites.

Towards the end of this video...
https://vimeo.com/152183752

 

[Over the Hill]

and remember to place any generator well away for any shaft. 

That was a close call once for the old lags of the NCC. 

 

[ah147]

That's actually not a bad idea max...could be knocked up pretty simply...even by me!


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[Cartwright26]

we use a pump that pumps up blow up matresses attached to a hose pipe thats enough to ventilate/circulate air around but our dig is a small tight horizontal dig.