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Old 09-05-2012, 11:11 PM   #1
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Default Fuel dispensing questions

If I understand 514.8 exception 2 right, I only need to go underground with rmc or imc for the first 24 inches and then can change to pvc. I've been told by 2 different fuel dispenser installers that it needs to be 10 feet.

Do I need seal offs where I enter the building if its 25 feet from the dispensers? I will have seal offs at the dispensers.

Is there a way to protect the rmc or imc from rusting where it enters the ground, like sleeve it in pvc? Probably a dumb question!
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Old 09-05-2012, 11:20 PM   #2
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Quote:
Originally Posted by Landmark View Post
If I understand 514.8 exception 2 right, I only need to go underground with rmc or imc for the first 24 inches and then can change to pvc. I've been told by 2 different fuel dispenser installers that it needs to be 10 feet.
You're right. Exception #2 allows that.

Quote:
Do I need seal offs where I enter the building if its 25 feet from the dispensers? I will have seal offs at the dispensers.
514.9 Sealing.
...
(B) At Boundary. Additional seals shall be provided in
accordance with 501.15. Sections 501.15(A)(4) and (B)(2)
shall apply to horizontal as well as to vertical boundaries of
the defined Class I locations.


501.15 basically says you need a seal-off within 10 of the boundary. Exception #2 says you can put it where it emerges from grade as long as you bury the conduit per 300.5 and don't put any fittings before the seal-off. So yes you need one at the building.

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Is there a way to protect the rmc or imc from rusting where it enters the ground, like sleeve it in pvc? Probably a dumb question!
Use Robroy (PVC coated rigid) for your stub-ups and convert to PVC once you're 24" down. I don't believe you need concrete encasement of the PVC but I'm not sure.
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Old 09-06-2012, 05:40 AM   #3
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Up here you can use Tec Cable with Explosion proof conector.
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Old 09-06-2012, 10:01 AM   #4
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I've been told by 2 different fuel dispenser installers that it needs to be 10 feet.
I've had that discussion with many "fuel installers". It is usually more cost effective to install the 10' length rather than take the time to cut and thread a piece of conduit. Since they have always seen it done that way, they think it's required. It's not.

Ask them for a code reference and you get some weird answers.
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Old 09-06-2012, 10:25 AM   #5
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RobRoy / Ocal is nice, but I've done just fine with simple pipe-wrap tape. It's amazing how well a simple layer of tape stops corrosion.

I'd chcek local practices, though. Different soils act differently.
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Old 09-06-2012, 11:27 AM   #6
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Originally Posted by Landmark View Post
If I understand 514.8 exception 2 right, I only need to go underground with rmc or imc for the first 24 inches and then can change to pvc.
Just to be clear, I believe it says 2' of steel prior to turning up, so you would go down, turn the 90, then 2' before PVC.

Edit: In case you don't read any farther, this is incorrect as pointed out by eric
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Last edited by hardworkingstiff; 09-06-2012 at 01:34 PM.
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Old 09-06-2012, 11:34 AM   #7
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Just to be clear, I believe it says 2' of steel prior to turning up, so you would go down, turn the 90, then 2' before PVC.
It says 24" before emerging from grade.
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Old 09-06-2012, 01:34 PM   #8
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It says 24" before emerging from grade.
So it does, I stand corrected. Thank you.
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Old 09-06-2012, 07:35 PM   #9
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Thanks everyone! I'll probably just start with a 10' stick of rmc from the seal and go underground and then change to pvc. I'll post more questions as I do this job if I have any.
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