Transformer area calculation
Transformer area calculation
(OP)
Im designing a deluge system for a 230 kV transformer in a electrical power station, at the moment of calculate area of transformer NFPA 15 suggest the following: "The water shall be applied al a net rate not less than 0.25 gpm/ft2 of the proyected area of a rectangular prism envelope for the transformer and its appurtenances,..." so I most consider ONE big rectangular prism that contains body transformer, radiators and oil conservator tank, in this case its include a non-existent surface area but I guess its a like a security margin. Im doing it fine?





RE: Transformer area calculation
RE: Transformer area calculation
RE: Transformer area calculation
dont try, do it!
RE: Transformer area calculation
RE: Transformer area calculation
http://www.sinclairfire.com.au/uploads/52/37/08082...
http://www.diamondelectricals.com/images/protectow...
RE: Transformer area calculation
http://www.eng-tips.com/viewthread.cfm?qid=327639
http://www.sfpe.org/LinkClick.aspx?fileticket=XKjV...
RE: Transformer area calculation
If you look at power plants you will see a ton of deluge systems protecting transformers along with fire walls on either side of the transformer.
RE: Transformer area calculation
RE: Transformer area calculation
It depends upon the area and the AHJ. Most of the transformer here in Qatar is protected by deluge water spray system and it's a requirement from the AHJ.
RE: Transformer area calculation
Your assumptions are correct but remember that this is only "theoretical", minimum demand required. When you are using the actual spray nozzle, it tends that the demand of the system is more compared to the theoretical value.
RE: Transformer area calculation
Georgemech is right, in qatar a lot of deluge system was done for an outdoor transformer.
RE: Transformer area calculation
dont try, do it!
RE: Transformer area calculation
RE: Transformer area calculation
Wether you supose a prism or take on account all oil cointainig exposed parts. At the end the hyd. calculatins will tell you if you are using enough water for a range of pressure conditions. Depending of the geometry you shall also include areas underneath radiators, big spaces between tank and radiators,etc. So you can do and aprox calcution based on prsim but when you locste all the nozzles and define diameters yo shall check enough water is cooling all required surfaces at least with 0.25gpm or so.