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Mine Exploration Forum

Author Air / Water Seals in Adits
christwigg

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Joined: 20/02/2008
Location: Cleveland / North Yorkshire

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Air / Water Seals in Adits
Posted: 07/12/2012 11:48:57
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Has anyone got any experience on this sort of scenario ?

An apparent air seal has been found in a local drainage level, with a pipe through the base of it.

Its perhaps 50m into the level and it seems a fairly safe bet its to stop air coming in/out and breaking the circuit on the mine ventilation.

However, someone has put forward a theory that there was a dam in front of the drainage level to sump it, theres an exagerated diagram here.


(click image to open full size image in new window)



I've never come across this sort of scenario elsewhere and i'm not totally convinced, although with the level drained and the pipe exposed the air would be able to get in, so is the theory right ?

Has anyone come across anything like this elsewhere ? We're probably talking late 1800's
IP: 145.8.104.65 Edited: 07/12/2012 11:50:47 by christwigg
staffordshirechina

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Joined: 15/11/2009
Location: North Staffordshire

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Air / Water Seals in Adits
Posted: 07/12/2012 12:27:21
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I can't think of anywhere where there is a water seal but air walls with a drainpipe are common.
Even our main fan outlet chamber has a drainpipe through the bottom of the wall to let water out. More blow it out actually, but it works!
The majority of our air walls have a couple of blocks missing from the footing course to allow seepage.
In ventilation terms the drains do not really matter but if water built up it would be a problem.

Les
IP: 95.144.207.11
Morlock

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Joined: 31/07/2008

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Air / Water Seals in Adits
Posted: 07/12/2012 18:41:59
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Only similar I've come across is an adit that drains the old mines at Rheola, drainage water is then pumped to reed bed filter plant. High/low water marks appear to be pump level switch operating range and, when not sumped, noxious and explosive gases whistle out.


IP: 86.29.126.222
simonrail

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Joined: 23/07/2008
Location: Cleveland

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Air / Water Seals in Adits
Posted: 07/12/2012 21:48:47
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In the location in question the pipe is accessible along the adit which seems to be level and not inclined as per the diagram. The question of a dam should be determined when access is possible through the pipe into the further reaches of the adit.

This mine was ventilated by either furnace or natural so if air came into the workings through the water level then that shouldn't have been a problem.

There is a similar water level at another local mine 800 feet long and that is level without a dam or any obstruction (apart from the ladders that Dave destroyed!!)



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Yes, I'll have it - what is it?
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RJV

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Joined: 16/03/2008
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Air / Water Seals in Adits
Posted: 07/12/2012 22:04:46
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simonrail wrote:

(apart from the ladders that Dave destroyed!!)



Luckily it was only his head they landed on, nothing that could be damaged. Wink
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Roy Morton

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Location: Redruth Cornwall

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Air / Water Seals in Adits
Posted: 08/12/2012 01:05:02
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There was a similar set-up used at a mine near near Zennor here in Cornwall. An adit on the coast was being worked by a couple of guys (father and son team?) and they deliberately dammed the entrance so the sea would enter it at high tide blocking it off. At low tide the entrance had to be pumped out and they would carry a small petrol powered pump to empty the sump. It kept people out when they were not working in the mine. Cheap and effective security.

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'Bid me discourse, I will enchant thine ear'
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andy@cakesandcaves.co.uk

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Air / Water Seals in Adits
Posted: 08/12/2012 22:19:30
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It appears I was right and wrong about the water seal. I looks like the wall was used as a dam as we found a sealing plate for the pipe in the wall. A smaller diameter pipe passed through the wall and out to a valve.

Therefore they did flood the water level. But higher up from the seal. The water had a purpose.

The wall is only located where it is because of a fault in the geology.
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Trewillan

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Air / Water Seals in Adits
Posted: 09/12/2012 00:15:11
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Roy Morton wrote:

There was a similar set-up used at a mine near near Zennor here in Cornwall. An adit on the coast was being worked by a couple of guys (father and son team?) and they deliberately dammed the entrance so the sea would enter it at high tide blocking it off. At low tide the entrance had to be pumped out and they would carry a small petrol powered pump to empty the sump. It kept people out when they were not working in the mine. Cheap and effective security.


Cheap and effective, requiring an expensive pump and a lot of effort. There may be some logic there, but I have missed it.
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Buckhill

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Air / Water Seals in Adits
Posted: 09/12/2012 17:46:14
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Only example of air/water seal I know is in the separation of Haig & Wellington, but this was in inclined drifts rather than levels. Up until the closure of Harrington 10 & William in 1968, and stoppage of their pumps and fans, the Wellington main road was used as the 4th return for Haig. With all four pits interconnected the water and gas flow was going to be to Haig (deepest of the four). Four ventilation seals were put in the connecting drifts to Wellington with U-bend pipes through them. This drained the water to a new pump lodge in Haig but the gases were kept back and were vented from Wellington No3 shaft to the old boiler chimney (Candlestick). IP: 86.152.110.93
christwigg

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Joined: 20/02/2008
Location: Cleveland / North Yorkshire

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Air / Water Seals in Adits
Posted: 10/12/2012 11:47:20
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simonrail wrote:

In the location in question the pipe is accessible along the adit which seems to be level and not inclined as per the diagram. The question of a dam should be determined when access is possible through the pipe into the further reaches of the adit.

This mine was ventilated by either furnace or natural so if air came into the workings through the water level then that shouldn't have been a problem.



The diagram is exagerated, theres 100m between the entrance and the stopping, so there must be some gain in height or it wouldn't be a very good water level.

Further discoveries at the weekend indicate a pretty good air seal was in place, with just a six inch hole remaining in the pipe.
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Jimbo

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Location: Ooop North

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Air / Water Seals in Adits
Posted: 10/12/2012 22:17:45
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Just seen this, where is it Chris, PM me if you wish, intrigued Smile

Jim
IP: 31.74.255.142
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