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#88729 - 07/13/04 01:41 PM Outside diesel tank  
ayrton  Offline
Joined: Dec 2001
Posts: 201
I have a customer w/a outdoor diesel tank which has a pump. (purpose to fill trucks)
It is not a pump like a gas station. Just a big cylindrical tank with a pump motor.
Need to run 115 cir from adjacent building.
All conduit to be surface mounted on interior wall, through to outside and pump location. Question is is this a Class 1 Div 1 area? diesel is not a gas, but has a flashpoint of 160F to 180F. I am mounting a disconnect w/in eysight of the pump behind the tank (about 12') Does it have to be explosion proof? Are EYS seals required. Customer wants keyswitch to turn on pump when filling. Assume I need EYS fitting there too. (never done explosion proof before). Will conduit in building have to be rigid? Would like to run EMT in building out to disconnect than rigid to pump. Acceptable??
Do not see "diesel" mentioned in 500 section of NEC.
Called inspection agency and they said treat diesel same as gas.

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#88730 - 07/13/04 05:27 PM Re: Outside diesel tank  
Tom  Offline
Joined: Jan 2001
Posts: 1,044
Shinnston, WV USA
I don't believe that a diesal fuel dispenser is a hazardous location that would require seals, threaded pipe etc.

Take a look at 514.3(A)


Few things are harder to put up with than the annoyance of a good example.

#88731 - 07/13/04 06:06 PM Re: Outside diesel tank  
ayrton  Offline
Joined: Dec 2001
Posts: 201
It seems to me a tank outside cannot be a Class I area.

#88732 - 07/13/04 08:25 PM Re: Outside diesel tank  
resqcapt19  Offline
Joined: Nov 2000
Posts: 2,148
Lots of outside areas are Class 1 locations. Some are even Class 1 Division 1.


#88733 - 07/14/04 04:35 PM Re: Outside diesel tank  
ayrton  Offline
Joined: Dec 2001
Posts: 201
I still cannot determine from 500 sec of NEC whether or not this falls under a classified area. Is it up to me to determine or an engineer?

#88734 - 07/14/04 04:42 PM Re: Outside diesel tank  
ayrton  Offline
Joined: Dec 2001
Posts: 201
Diesel has a flashpoint of 160 deg F to 180 deg F. According to International fire Code Flammable liquid is anything under 100 deg F. So that tells me it is not a "flammable liquid", so it doesnt fall into a classification in Sec 500- of the NEC

#88735 - 07/14/04 06:12 PM Re: Outside diesel tank  
Ryan_J  Offline
Joined: Aug 2003
Posts: 1,374
West Jordan, Utah, USA
Diesel fuel does not fall into article 500.

Not classified. [Linked Image]

Ryan Jackson,
Salt Lake City

#88736 - 07/16/04 03:52 PM Re: Outside diesel tank  
walrus  Offline
Joined: Jul 2002
Posts: 680
Bangor Me. USA
Seal Tite would be what I have used many times on Diesel, Kero, or 2 oil. Unless gasoline is on the same island.

#88737 - 08/09/04 05:11 PM Re: Outside diesel tank  
dgillespie  Offline
Junior Member
Joined: Dec 2003
Posts: 1
New Braunfels, Tx USA
I have the same situation here, and this is what I on...

Diesel fuel is considered combustible, not flammable. Therefore, a diesel dispensing area is unclassified, and associated electrical equipment and wiring need not comply with the requirements of Chapter 5. But it's common to wire diesel fuel dispensers adjacent to gasoline dispensers. If conduit for the diesel dispenser passes through the Class I, Div. 1 or 2 areas around the gasoline dispenser, the wiring methods and sealing requirements in Art. 501 apply.
I found this at

Hopes this helps.

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