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Old 05-03-2019, 08:39 PM   #1
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What is the best way to prevent water from flowing inside a conduit? This is for underground feeders going into the basement. It’s a commercial building.
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Old 05-03-2019, 08:54 PM   #2
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Spray foam topped off with hydraulic cement.
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Old 05-03-2019, 08:55 PM   #3
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Polywater sealant is what you're looking for.

https://www.polywater.com/product/po...-duct-sealant/

Most standard duct seal products are labeled "not for outdoor use".

Truth is though whatever you use , it's mostly for looks, water always finds a way.
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Old 05-03-2019, 10:39 PM   #4
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Tell the plumbers to run their own pipe and stop trying to hijack yours
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Old 05-03-2019, 11:03 PM   #5
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Spray foam topped off with hydraulic cement.
Hard to type while I'm still laughing
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Old 05-03-2019, 11:19 PM   #6
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Coincidentally, I'm dealing with a similar issue, three 4" conduits coming into a swbd in a basement below the ground water level.

I just bought a 4 pack case of that Polywater spray foam linked to above to meet minimum order quantity. Never used it before.

I need to make up the wiring we pulled in those 4 inchers on Monday, so I'll try that Polywater out after I finish. I'll bet I'll have 3 cans left over....

I paid about $325 for a case of 4 cans. Not cheap. But it's better than having water issues in a basement.
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Old 05-04-2019, 05:47 AM   #7
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Quote:
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What is the best way to prevent water from flowing inside a conduit? This is for underground feeders going into the basement. It’s a commercial building.
The feed from a transformer pad? Transformer sits on a 3 foot pit. Our conduits can act as a drain (we can bring them up only 6 inches thus as much as 2 feet of water on top of them).

I asked the utility to foam the conduits in the pit. They tell me do my end. I tell them it's a hundred foot run and I can't stop it at the end. They did foam one transformer pad for me. Helped a bit.

I put a really nice garden hose drain in another building. stopped water from entering a 1200 switch in one building and a 400 amp switch where I installed the drain hose. Both buildings fed by the same transformer.

I'll show you one day if you want.
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Old 05-04-2019, 07:03 AM   #8
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Ductolox 431. This product will work for a conduit that is already leaking, or as a preventative method should water ever enter a conduit sometime in the future.

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Old 05-04-2019, 07:08 AM   #9
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Old 05-04-2019, 07:09 AM   #10
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Old 05-04-2019, 09:12 AM   #11
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American Polywater's various goops and icks have never let me down. That Ductlox product looks good, like a modernized oakum.
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Old 05-04-2019, 09:27 AM   #12
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In August of 2018 I was exchanging email with the rep from Polywater regarding CSA approvals, etc.

Seemed like a very good product and if I was in the situation where I needed something like that I would consider their product. They have been selling the FST in Canada for over 20 years according to the rep.

Cheers
John
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Old 05-04-2019, 07:07 PM   #13
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Ductolox 431. This product will work for a conduit that is already leaking, or as a preventative method should water ever enter a conduit sometime in the future.

https://youtu.be/ZxvQR1YQhYQ
"Due to the adhesive properties of Ductolox 431, your hands have now become affixed to the conduit. After approximately 1 1/2 to 2 minutes, have an assistant sever you hands at the wrist with the included bone saw. The repair is now complete."
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Old 05-05-2019, 10:11 AM   #14
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"Due to the adhesive properties of Ductolox 431, your hands have now become affixed to the conduit. After approximately 1 1/2 to 2 minutes, have an assistant sever you hands at the wrist with the included bone saw. The repair is now complete."
I was going to recommend this but then I saw a bad review for it.

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Old 05-06-2019, 11:40 AM   #15
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Have used the polywater on a 1500A service and have not heard back of any issues. Then again, it was for a restaurant in Chinatown, so they might not want to draw any attention to the sweat-shop in the basement...
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Old 05-06-2019, 05:25 PM   #16
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Have used the polywater on a 1500A service and have not heard back of any issues. Then again, it was for a restaurant in Chinatown, so they might not want to draw any attention to the sweat-shop in the basement...
You get all the glory jobs.

How long did it take you?
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Old 05-06-2019, 09:01 PM   #17
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Just squirted the purple Polywater foam into our three 4" conduits.

It's as easy as using regular expanding foam.

We cut a 12" chunk off the plumbers 4" pipe laying on the ground and squirted foam into it, after about 4-5 minutes it was pretty well set up. We poured some water in one end and got no drips coming out the other. Works for me. After that test, we did our conduits. One can did four 4" pipes and still had some leftover. It sets up in about 2-3 minutes, any longer than that if you dink around when foaming conduits and you are going to be replacing the straw on the can due to it plugging.

Tomorrow we will hide the evidence from the plumber...

I tell ya, if you have a plumber you don't like, one little 1/4" hole in the side of one of their DWV pipes will make an adequate filler hole for some purple polywater foam....
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Old 05-07-2019, 11:14 AM   #18
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Quote:
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You get all the glory jobs.

How long did it take you?
Minutes I think, didn't really stick in my memory, so it must've gone smooth. What took a long time was finding the right product.
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Old 05-07-2019, 12:31 PM   #19
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Quote:
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Just squirted the purple Polywater foam into our three 4" conduits.

It's as easy as using regular expanding foam.
How much water are you holding back? 10, 20, 50, 100 feet?
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Old 05-07-2019, 07:45 PM   #20
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Quote:
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How much water are you holding back? 10, 20, 50, 100 feet?

3-4 feet of groundwater we figure.
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