Area Classification for Diesel Fire Pump Building

[edienberg]

We are building a new combined cycle plant in Ontario and have a 12' by 18' pre-engineered vendor supplied diesel fire pump building. I am no expert on Area Classification, but assume the interior of the building shoul be Cl. I, Div. 2, Grp, ?. Neither the NEC or OESC speaks to diesel fuel. Is Diesel fuel/vapor grouped. Is it even explosive?

Any help would be great

 

[DRWeig]

edienberg,

Check with your local fire authority. Most places, an adequately ventilated room with just a day tank full of diesel is not classified (flash point of diesel can vary from 100F to 200F, with most being above 125F). We often see open-type relays on top of day tanks that start and stop the pump.

However, there are exceptions in some localities... It's best to be sure.

Let us know what you find out!

Good on ya,

Goober Dave

 

[rbulsara]

Refer to NFPA 37 and NFPA 30, upon which most legal requirements about fuel storage for diesel (and also gasoline) engines are based in the USA. (I know you are in Canada but this may provide some reference). Some requirements vary by local codes and zoning regulations. A web search on the topic throws up some good links for general information.

Speaking of the USA, typically diesel is not considered flammable or explosive. For above grade storage and up to 660 gallons there are no special rules, except may be for having a UL listed tank. Anything more than that requires extra measures up to some limit, like 3 hr rated fire enclosure and such.

Much more stringent rules and restrictions are there for underground storage of course, for any quantity.

There may be other applicable codes beside NFPA and depending upon the location EPA requirements need be met.

In the end, you need to conform to the local laws.



Rafiq Bulsara

http://www.srengineersct.com

 

[dpc]

Last time I looked into this even the inside of a diesel storage tank is not considered a hazardous location.

David Castor

http://www.cvoes.com

 

[rbulsara]

Yes, that 660 gal limit is for inside the buildings. There is no quantity restriction on above grade outdoor tanks, except for double containment and physical protection.

Again verify all this with mechanical engineer and/or tank mfrs.

Rafiq Bulsara

http://www.srengineersct.com