Multi sink drain plumbing?

[DieselPills]

I good a good deal on some big utility sinks, I'm going to install three of them side by side in my shop. That way I can have one full of junk that needs to be cleaned and another full of stuff soaking while I still have one to use.

With that in mind, do I need a P trap under each sink, or can I just tee them all together and have one P trap at the end?

 

[dbabicky]

I have a 3 tub kitchen sink and only have 1 trap. Never any problems. No need for a trap on every sink. Just need 1 on the final run out.

 

[James-W]

I am not a plumber but I would think you would want a trap on every sink.

 

[mires]

As long as they are all tied together, you only need one trap. Are you dumping into a floor drain or tying into a stack?

 

[DieselPills]

As long as they are all tied together, you only need one trap. Are you dumping into a floor drain or tying into a stack?

It will be tied into the 2" drain that is under the sink in my bathroom on the other side of the wall. Then into septic.

 

[Norcal]

Multi compartment sinks are usually plumbed into a floor sink, but never have seen more then 2 compartments on 1 trap, with a floor sink no traps on the sink are needed, but in food service establishments where 3 compartment sinks are required, they want a indirect waste connection with a air gap between the end of the drain & the flood rim of the floor sink.

 

[79firebird]

Yes ive seen it done befor with one of these ABS Double Tee-Wye. Might not be up to code but can be done.

 

[SJR033]

Well, my "double" kitchen sink only has 1 trap. And the point behind the p-trap is to prevent sewer gasses from coming up & out the sink. So, I would think that 1 trap is all that you would need IF they are all tied together. If separate drain lines are used then separate p-traps. If they are tied together, 1 trap should provide you the gas block.

 

[James-W]

Well, my "double" kitchen sink only has 1 trap. And the point behind the p-trap is to prevent sewer gasses from coming up & out the sink. So, I would think that 1 trap is all that you would need IF they are all tied together. If separate drain lines are used then separate p-traps. If they are tied together, 1 trap should provide you the gas block.

Yes, most people have a double kitchen sink. But if you read the opening post again, he said he bought 3 separate sinks. He wants to set all 3 sinks up in his garage and use them. I would think that with 3 separate sinks you would want a trap for each one. But aside from that, we aren't talking major dollars here, traps are quite inexpensive so necessary to meet code or not, the cost of putting them in would be very minor.

 

[sberry]

You only need one for this.

 

[sberry]

Ha, just cleaned one from a triple, was at the Lions club where they have pancake breakfast. Air gap all clogged with batter.

 

[kbs2244]

There are 3 bowl kitchen sinks that are plumbed into one trap all the time.
I do not know what the code would think about 3 separate sinks in series.

 

[ddawg16]

I would do a trap at each one....makes it easier to retrieve that dropped item when it goes down the drain.

 

[mygarageone]

You should really be using a safe waste set up and it should not drain into the septic system unless you run everything through a grease interceptor .
The worse thing you can do is put stuff that's not supposed to go into a septic tank!
But I am sure your going to hear from some one on this site who thinks it's ok .

 

[ddawg16]

You should really be using a safe waste set up and it should not drain into the septic system unless you run everything through a grease interceptor .
The worse thing you can do is put stuff that's not supposed to go into a septic tank!
But I am sure your going to hear from some one on this site who thinks it's ok .

Along with PVC for air lines......

 

[rburke65]

Oh ya and don't for get no fire insurance if ya have a wood burner!

 

[rburke65]

No experience.....not a plumber but I'd vote for one trap.

 

[DieselPills]

I would do a trap at each one....makes it easier to retrieve that dropped item when it goes down the drain.

I would normally keep a screen over the drain to catch parts, and chunks, and I've been thinking of putting a 1.5" PVC ball valve on the drain output, that way I can plug/unplug it without reaching into a sink full of dirty water. And I don't have to remove the screen for a drain plug.

You should really be using a safe waste set up and it should not drain into the septic system unless you run everything through a grease interceptor.

Sink water (grey water) goes into septic tanks. I'm assuming this is code, Where else would I dump it? I agree some kind of grease trap wouldn't be a horrible idea, but I'm careful about what goes down there.

I'm going to setup a 4th, plumbed into a recirculating pump not a drain, as a parts washer for the really dirty stuff.

 

[sberry]

How did you come up with the vision of needing all these sinks? I do about everything you can do in a shop and cant recall a single time i wish i had this.

 

[DieselPills]

How did you come up with the vision of needing all these sinks? I do about everything you can do in a shop and cant recall a single time i wish i had this.

See post #1. I also paid exactly $18 each for brand new sinks. And I happen to already have two faucets laying around, new in box. Another one is less than $20.

Don't tell me you've never seen a triple bowl utility sink before?? Those are hundreds of dollars...I made one for $54.

 

[Doublet74]

Every multi bay sink I have ever hooked up ( for a mechanical \ industrial use) has been to pipe in an indirect waste. You pipe all three sinks to either a mainline or individually and have them dump into a collection with a trap. That way traps on each are not necessary. It also allows you to collect anything that falls down the drain at the dump. Most economical way to do it. And if your using it as a parts wash\ soaking sink you don't have to worry about losing anything. And also will be up to plumbing code in case anyone ever cares to look.

 

[sberry]

See post #1. I also paid exactly $18 each for brand new sinks. And I happen to already have two faucets laying around, new in box. Another one is less than $20.

Don't tell me you've never seen a triple bowl utility sink before?? Those are hundreds of dollars...I made one for $54.

A utility sink is one of the handiest items in a shop ,,,, this is just an opinion,, but because they are expensive and I got it for cheap doesn't make it very practical. I could shove the place up with stuff people give me all the time that was expensive when new.
It takes up hundreds or thousands of dollars of floor space. I had one, didn't install it and gave it away, a single or even a modest double I understand but was wondering just what a guy could really do with this.

 

[sberry]

I use free and cheap all the time but I got to need it and never do so based on what I think it's worth. I did read the original post, I can read between the lines too.

 

[DieselPills]

It takes up hundreds or thousands of dollars of floor space.

A little bit of an overstatement there. My shop is more than 15,000 square feet. I can afford the space.

I suspect you and I have a different philosophy on setting up a 'nice' shop and cleaning things. Most importantly, a man does not need a reason to have something in his shop. You sound like a woman...

 

[sberry]

You are correct that you don't need a reason. I only asked out of curiosity as with most brainstorm I really wonder what the purpose might be. I figure that most guys with substantial investment and means doing a shop setup would either be oservant enough or have the know-how to plumb the train on a simple sink.
The fact that I may be compared to a woman further re enforces an educated guess that we are talking to an obsessive junk collector and he has probably heard this question before.
This is just a guess, I might be all wrong and it really doesn't matter. The fact is I was up with a cold and this was the most interesting thread to speculate on.
15k is pretty substantial, these are the kind of buildings that interest me. I understand more limited garages as many here have and try to tailor answers accordingly and get a grip on if it's a hobby or if involves design where men are paid to walk around.
I simply wondered what a guy would wash in this fashion. With a larger shop several sinks surely could be an asset. I have 2 utility tubs myself but neither were an afterthought and as a few things change could really get rid of one as the use has tapered off. I switched the water heater off to 1 as of late.

 

[sberry]

I do have a philoshophy on cleaning. It's a vital part of my day and most happens outside before it ever rolls in. As a matter of fact ordered a new hose yesterday to do it. 120$ to replace one that still works but has been repaired a couple times but I don't want the downtime at when least needed.