PVC drain pipe size question

[RTcat]

Ready to start putting in the drain pipe and stub for the two floor drains before concrete starts.

This detached work shop has no running water to it...and likely never will. Only reason I'm putting in floor drains is if I have to park a snow packed vehicle and want it to melt off over night before working on it and to drain the compressor. the 32 x 50 shop will have infloor radiant heat. The drain pipe will run to an outside trench drain of some sort. I will be putting traps on the two floor drains. Because of the low volume of water that will see this system:

Is 2" drain pipe sufficeint, or should I go with 3"?

TIA

 

[Frank The Plumber]

Many places have a code that states 4" minimum for under ground. Pvc is so inexpensive that I would opt for the larger pipe size just so that if debris gets into it you can use the larger and more powerful rod machine and cables to flush the debris out.
For the most part that is why some places require the 4', properly installed you would have a tough time plugging 4 and not being able to punch a jet or a cutter head through the blockage.

 

[kbs2244]

4 inch heavy wall.

You do not need traps.
They are to prevent sewer gas from backing up into the building.
But if you are not attaching to a sewer you don't need them.

I would use the large radius "sweeps" for your bends.
Even if you have to lay them a bit sideways because you don't want to dig that deep.
Low flow can invite grit to clog and the sweeps make it easy to run a hose through the pipe to rinse it out.

 

[Frank The Plumber]

P traps may keep out a lot of critters, mice, squirrels, chipmunks, cats.

Not rats, they go right through them.

 

[VHF]

I have 3" PVC for my three floor drains. The drains themselves are the bell-trap design. Each spring I open them and clean out the acummulated salt from the winter.

 

[70redbee]

If this is getting inspected you might inquire if you need an oil seperator. Just trying to keep you out of trouble

 

[RTcat]

Thanks everyone for your thoughts. Zoned ag so no plumbing inspection.

Frank the Plumber: Sioux Chief is good stuff, correct?

 

[Frank The Plumber]

For the most part it is decent product, every line has a few things that are not so good now days what product you looking at?

 

[RTcat]

For the most part it is decent product, every line has a few things that are not so good now days what product you looking at?

Their "quad drain". They will be positioned where the wheel of a vehicle can't be driven over them. http://www.siouxchief.com/Drainage/ResidentialDrainage/FloorDrain/Quad-Drain.IBQ91

I have their fat max drains in my garage which work great for washing cars, but they would be overkill for my shop. As I mentioned, just need to handle emergency snow melt and draining the air compressor.

 

[Frank The Plumber]

As long as you don't roll over them should be fine. Sort of fancy, I would just use the chrome pop in grates, if they get trashed you just pop a new one on. If this gets trashed you'll have a tough time putting a cover on it.

 

[55chevr]

Check local code. Here you cannot bury PVC.