Required Water Quality for DELUGE System for Oil Transformers

[imanou]

Hi to all!
I am wondering about the needed quality of the water which is used on outdoor oil-transformers fire fighting deluge systems. Just poor potable water is good enough or is needed something special like demi water with low conductivity or something else?

Thanks in advance!

 

[stookeyfpe]

The water does not need to be treated. Potable or nonpotable water will work.

 

[pipedream]

traeted water is not needed but it should not contain debris or sediments as this could possibly clog a pipe or spray nozzle. where is your supply coming from?

G3

 

[imanou]

Thank you very much for the reply.
My worry is, if for any reason the transformer deluge system is beginning to operate without to disconnect timely the power from the transformer and the possible flashover risk. (the transformer prime voltage is 150kV).
For this reason, I am wondering if is worthy to use demineralizated water (with lower conductivity) instead of the normal water?

 

[DavidCR]

I suppose you have considered the table in NFPA 15 where safety clearances from uninsulated live parts are given.