Ventalation for a switchgear room

[dithomas]

I need to keep a switchgear room clean in the middle of the coal handling yard of a coke plant.

Any ideas on a positive preasure system?

The room is 20ft x 40ft with one 1500kva dry type transformer as part of a 4160/480 single ended unit substation.

Dan

 

[itsmoked]

You can seal up the space and air condition it. This is the sure bet. But of course has a fairly high operating cost.

Can you seal the room well then provide dry plant air with pressure control like those used in clean rooms to keep the rooms a few millimeters above the atmospheric pressure.

What are you thinking?

Keith Cress
Flamin Systems, Inc.-

http://www.flaminsystems.com

 

[dithomas]

I am thinking of a supply fan with an automatic roll type filter element and a smaller lovered exhaust vent set to maintain a positive pressure. The switchgear buildings are free standing and outside air would drawn in. The other idea I have is to seal the room and install ceiling fans to circulate air.

The coal dust is almost like talcum powder and had built up on horizontal surfaces and transformer bracing. We cleaned and tested the equipment after it had been in service for about 18 monthes and there was an inch of dust on all surfaces. Had the primary voltage been 13kV rather than 4160 volts there would have been a flash over.

No matter what is installed there will be constant maintenance of the filter elements.

We used a similar rolling filter system in the steel mill for filtering large motor cooling air.

The best solution would have been the owner not putting the switchgear next to the rail car loading conveyor!!!!


Dan

 

[arcflash99]

If you do choose to close up the switchgear room, I would suggest air conditioning the building. As well as maintaining a positive pressure.

 

[Skogsgurra]

The lowest operating cost (depending on where in the World you are) and also the best way of keeping dust out is to maintain a slight overpressure, circulate air in the room and make air pass radiators with cool water circulating in them so that water transports heat out of the room. This, of course, only if cool water is available at low cost. Sealing the room so air doesn't get out easily makes need for filter maintenance lower.

Gunnar Englund

http://www.gke.org

--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...

 

[dithomas]

Thanks to all for your replies.

We are located in Ohio, USA

I am searching for a manufacturer of rolling filter material since the trick seems to be put the room under a positive preasure with CLEAN air.