Gas line in concrete pad
#1
01-04-23, 07:35 PM
Gas line in concrete pad
A friend is relocating a gas grille/fire place (city gas) in the backyard. The gas line needs to be buried in part in the concrete slab. What kind of pipe can I use? He is considering flexible gas pipe (yellow MDPE) cased in a larger PVC. Can MDPE be pulled/pushed through the gray PVC conduit just like an electrical wire? It will be tied to the existing, above-ground IPS. Thank you.
#3
01-05-23, 08:33 AM
Group Moderator
Yes, CSST gas tubing can be pulled through conduit. Keep in mind the size of the gas line and the how easily it bends. You need LARGE radius bends in the conduit. The big sweep 90's used for electrical are a good option especially if you use a large size. Do not pick a conduit just big enough for the gas line. If running 1/2 or 3/4" gas line I'd like to see 1 1/2" or 2" conduit to make it easier to pull the gas line. Still, 90 degree bends are tough. I would only attempt to pull through one.
A safer bet is to run the gas line through the PVC before gluing any sections together. That way you can manage the bends on their own and when you can easily get your hands right on it. This can allow you to pull the gas line through multiple bends if needed. Then after all the gas line is pulled glue the PVC together. Just make sure to seal the ends of the conduit AND gas line to keep them clean and protected when the concrete is poured.
A safer bet is to run the gas line through the PVC before gluing any sections together. That way you can manage the bends on their own and when you can easily get your hands right on it. This can allow you to pull the gas line through multiple bends if needed. Then after all the gas line is pulled glue the PVC together. Just make sure to seal the ends of the conduit AND gas line to keep them clean and protected when the concrete is poured.
#4
01-06-23, 09:44 AM
Beelzebub,
I don't think my friend checked the local code. May I assume what is commonly practiced in the gas industry will pass inspection?
Pilot,
Our plan is to install 2" electrical conduit with 90 degree ends before pouring concrete. There will be 2 short runs, each about 10' long. Eventually 1/2" or 3/4" CSST will be pulled. We will probably call a contractor to finish the connection afterwards. Thank you for confirming it is doable.
By the way, can the yellow polyethylene gas pipe be pulled through 2" conduit? Is PE pipe not pliable enough?
I don't think my friend checked the local code. May I assume what is commonly practiced in the gas industry will pass inspection?
Pilot,
Our plan is to install 2" electrical conduit with 90 degree ends before pouring concrete. There will be 2 short runs, each about 10' long. Eventually 1/2" or 3/4" CSST will be pulled. We will probably call a contractor to finish the connection afterwards. Thank you for confirming it is doable.
By the way, can the yellow polyethylene gas pipe be pulled through 2" conduit? Is PE pipe not pliable enough?
#5
01-06-23, 11:57 AM
Group Moderator
Don't assume anything. Check your code requirements before planning your job.
You need to see if PE pipe may be used in your application or if you need CSST or something else. Again, check your code requirements at the beginning of the project.
Keep in mind that temperature can have a impact on plastic. HDPE is affected by temperature more than CSST or soft copper. And, smaller pipe will be easier to pull than larger. Before pouring concrete I'd get a piece of the gas pipe and try shoving/pulling it through some conduit and a bend or two so you know what you're getting into. Having a proper setup can make a big difference like a good way to attach a strong rope to the tubing for pulling. You can also lubricate the tubing and even have a helper to push on one end while you pull from the other.
You need to see if PE pipe may be used in your application or if you need CSST or something else. Again, check your code requirements at the beginning of the project.
Keep in mind that temperature can have a impact on plastic. HDPE is affected by temperature more than CSST or soft copper. And, smaller pipe will be easier to pull than larger. Before pouring concrete I'd get a piece of the gas pipe and try shoving/pulling it through some conduit and a bend or two so you know what you're getting into. Having a proper setup can make a big difference like a good way to attach a strong rope to the tubing for pulling. You can also lubricate the tubing and even have a helper to push on one end while you pull from the other.
