CLA Connect Open Forum

Sewer Connection

  • 1.  Sewer Connection

    Posted 10 days ago

    Good evening could use some opinion out there regarding p traps. Double sink can use one p trap as long as it close to 30 inches or less? . Does that apply to washers also? Maybe using a y to a ptrap then a ptrap arm? Will sewer gas escape using one p trap?.

    Thank you for your feedback.



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    Tito B
    Store Owner/ Employee
    Los Angeles CA
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  • 2.  RE: Sewer Connection

    Posted 10 days ago
    That is a definite maybe. It is recommended to use a P trap at every machine. In the real world this is just not possible. You will have that aroma from the buildup in the pipe from the trap back however. Enzymes will help with this.

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    Curt Harrington

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  • 3.  RE: Sewer Connection

    Posted 10 days ago
    In our area of CA the administrative authority allows a continuous waste connection under a double sink with one trap, and for TL washers you can put a double sanitary cross to install the P-Traps back to back.  On FL washers you can use a sanitary cross for back to back P-traps here, but the line would need to be one size larger at the T...as in a 4x4x3x3 double sanitary cross....the top size (the second 4) can be varied for the proper venting or clean out sizihng.

    If you are going to have one outlet for the double sink, I would use ABS fittings to allow a trap for both sides of the sink in a laundromat with a no hub connection near the wall, so you can loosen the two tail pieces at the sink drain, along with the no hub band to remove the entire drain to clean as needed.

    We have P traps at every machine as it is required in our area.

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    Les Monthei
    Potential Investor
    Redding CA
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  • 4.  RE: Sewer Connection

    Posted 9 days ago
    Curt that's what i'm afraid of, the aroma and the extra soap bubbles going to the other machine. Sorry if i threw you guys off by giving the double sink as an example. I was trying to find a solution to keep the washers i have. I only have 2 double sanitary cross and have 8 washers in a row. I had a correction from the inspector to only have one ptrap per ptrap arm. Thats why i was wondering if i can use 1 ptrap with 2 washers per ptrap arm of the double sanitary cross. If not then we have to dig to the sewer tap below and add mo double sanitary cross ptrap arms.

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    Tito B
    Store Owner/ Employee
    Los Angeles CA
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  • 5.  RE: Sewer Connection

    Posted 9 days ago
    Perhaps I have been around this too long but sewer gas in a short space isn't that bad. There are times it will be noticeable but not offensive. If it becomes a problem hydro-blasting cleans the pipe completely. The one good thing about having a trap at each machine is when the soap bubbles get intense they probably will not back up into the machine next to it.
    There is a product made by Hillyard called Enzyme II that if you put a bit in the line when you close does wonders for that smell.

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    Curt Harrington

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  • 6.  RE: Sewer Connection

    Posted 9 days ago
    If I understand the question correctly; You want to put 2 washers on each branch of the sewer line going to the sanitary double tee?

    Yes, I have many times placed One P-trap in the line for up to four washers.
    I used a 4" main line, and had up to four 2" washer drains connected to it.
    I use Long Sweep tees to help prevent the soap suds and water from making their way back up the piping into the other washers.

    On the two 3" washer drain outlet branch, I did the same.
    Two 3" washer drains were connected to a 4" main branch. Again with Long Sweep Tees.
    (The end tee Always has a clean-out cap. On Each branch line. Even for only 2 washers. I don't end Any line with elbows)

    However, that being said, whenever possible I like to use 1 p-trap for each washer.
    A No-hub connector to the back of the washer outlet, and another where it connects to the branch tee.
    This allows me to remove the entire section when (not if) the section gets a clog in it.

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    DAVID CHAMLEE
    Service Technician since 1986
    and sometimes Laundromat Owner
    CCR
    Santa Barbara, CA
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  • 7.  RE: Sewer Connection

    Posted 9 days ago
    Yes David that's what were trying to do put 2 to 4 washers in 1 ptrap arm . Unfortunately i cant find in the code that it is allowed for washers, only laundry tub and sinks. Cant find a stacked double sanitary tee either if its allowed. Although it may only work if the FL is back to back to a TL using a standpipe for the secondary double tee . Previous code may have allowed 4 ptraps in a ptrap. So beware when you retool. Check code before jumping or it could be costly.

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    Tito B
    Store Owner/ Employee
    Los Angeles CA
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  • 8.  RE: Sewer Connection

    Posted 9 days ago
    In Virginia, we are required to have lint traps.  Generally we do this by dumping all of the water into a concrete pit that has a filter screen in it.   The outlet from the pit has a trap in it, so there are no sewer gasses coming up anywhere in the vicinity of the washers and there is no need for a P trap at the washers.



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    CHARLIE SMITH
    Store Owner/ Employee
    CHARLOTTESVILLE VA
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  • 9.  RE: Sewer Connection

    Posted 8 days ago
    Tito B.  I think I understand the question better.  The problem you are having with stacking sanitary crosses and or adding more traps to a P-trap run is what if referred to as wet venting and or eliminating venting.  If you can bring a 4 inch line above grade down low using a 4 inch combo on it's back below grade, you can probably run a 3 inch or 4 inch horizontal double cross above grade down low and provide a drain riser and vent for each P-trap (or back to back P-traps between machines).  You can re-vent the lines at the required height back to the main vent stack.  A sanitary T or cross is allowed in the vertical position drain and reverse positions in vents and a sanitary Combo or cross Combo is allowed on it's side or back in the drain line.  A combo is simply a combination of a Y and 45 degree L fitting on the branch, which is made in one casting.

    Most districts require medium to long sweep 90 degree L's on the drain and short sweep 90 degree L's are usually OK on the non-cleanout vents.

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    Les Monthei
    Potential Investor
    Redding CA
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  • 10.  RE: Sewer Connection

    Posted 8 days ago
    All, quick refresher note on sewer gas.  There are many things in sewer gas, however, if you smell the rotten egg odor, then beware.  That smell is almost exclusively hydrogen sulphide, H2S.  Hydrogen sulphide is insidious and can be deadly.  It will paralyze the olfactory sensors in your nose so that after a short while you can't smell it.  It is flammable, however I don't remember the UEL and LEL off the top of my head, but will look it up soon(UEL is upper explosive limit and LEL is lower explosive limit).  Lastly, it may attach itself to soft tissue in your lungs and shortly thereafter form H2SO4, sulphuric acid, which will scar the lung tissue (1H2S+4H2O=1H2SO4+4H2).  When you read in the newspaper that workers were killed while working in a sewer it was probably hydrogen sulphide, or possibly carbon dioxide, CO2.  Please be careful with open sewer lines, double so when you smell the rotten egg odor.
    Jim Allen
    Chief Burro
    VIP Coin Laundry

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    Jim Allen
    Potential Investor
    VIP Laundry
    Orange CA

    Potential InvestorVIP LaundryVIP LaundryJimAllenVIP LaundryVIP Laundry
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  • 11.  RE: Sewer Connection

    Posted 8 days ago
    Jim:  Back in the 60's and 70's there was a drain cleaner product available at wholesalers that was, IMO, too dangerous to use as it would react to other chemicals or drain cleaners that a customer would not tell you they used.

    Anyway, the reason it came to mind is that if you used it to burn off hair etc after the line was opened, a quart of the product in the drain line could make the whole local neighborhood outside smell like rotten eggs.

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    Les Monthei
    Potential Investor
    Redding CA
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