Thread: S (ish) trap?

Looks S-ish to me.. its close.

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Originally Posted by Marc M

Looks S-ish to me.. its close.

Not close
Without a vent it is an S-Trap.

Many mobile homes I see have mechanical vents, or even wet vents, scattered throughout the home, including under the tub skirt.

..........some manufacturers stub the drains from various sinks through the belly, to then be piped under the home. It saves a couple bucks per unit at the factory and pushes it on to the installer. I've not seen any that require traps to be added - this sure would be a disaster for a cold-weather site. Are you sure this trap was even needed in this instance?.......Greg

Yes that is an S trap, the outlet despite offset is considered vertical. No bend nor cleanout for transition to horizontal. Furthermore the S trap and branch appears unservicable as well.

Appears to be replacement/repair, note lack of dust, and new labels.

Suspect incorrect amature re-work following broken closet flange or bend of wet stack from bathroom group.

Plumbing rework sewer not consistant slope, support irregular (crowned at fitting), fitting on back, fitting appears to be a vent tee, not sanitary.

Connections appear to be "gooped" not abs cemented.

P.S. what is the pvc/cpvc system along the ground and through skirting...irrigation? Yard spigot?

copy that..

Originally Posted by H.G. Watson, Sr.

Furthermore the S trap and branch appears unservicable as well.

What requires a trap to be "serviceable"?

Originally Posted by Joe Funderburk

What requires a trap to be "serviceable"?

If it is removable, or has a cleanout (see pic) on it.

...........a broken closet flange would possibly require a repair that would need a trap under the house?? I'd still like to know what that line is servicing, as I can't see the need for a trap. The fact that I see ABS stubbed thru the belly makes me think it's factory work & the installer simply didn'tknow what he was doing. Could the OP enlighten us with a few more details? It would be good to report that it is, indeed, a running trap - it would be alot better to determine (and report) if the trap were not needed at all

Originally Posted by Gregory Booth

...........a broken closet flange would possibly require a repair that would need a trap under the house??

?
Closet (toilet) drain lines do not have traps.
Toilets have a built in trap.

Originally Posted by Rick Cantrell

?
Closet (toilet) drain lines do not have traps.
Toilets have a built in trap.

............my point exactly. Trying to figure out what the esteemed Watson is talking about

Originally Posted by Gregory Booth

... Trying to figure out what the esteemed Watson is talking about

I see now, you were referring to Watson's post.
I did not read his post ( mostly I just skim his post, if anything)

If you do (figure it out) let us all know.
On second thought, I don't think I want to know that much about it.

Originally Posted by Mike Kleisch

If it is removable, or has a cleanout (see pic) on it.

Ah...my bad. I didn't think it was a slip trap, but it does appear to be so in hindsight.

Originally Posted by Gregory Booth

..........some manufacturers stub the drains from various sinks through the belly, to then be piped under the home. It saves a couple bucks per unit at the factory and pushes it on to the installer. I've not seen any that require traps to be added - this sure would be a disaster for a cold-weather site. Are you sure this trap was even needed in this instance?.......Greg

I don't agree that it's a need to save money, almost always it's due to the obstruction of the chassis I-beams and the inability to connect to the main drain through a 2x6 cavity. What would be normal in the plant would be the trap inside the floor (above the insulation for freezing protection) running over to a san-tee, with a 1-1/2" vent on top and a 2" drop stubbed through the floor for the field connection to the drain system. (Even when stubbed, manufacturers are still required to show a fully completed drain system on their plans for each individual home. This would never get approved by any Design Review agency).

As for the trap arm, it violates 24 CFR, Parts 3280.606(a)(5) - traps being set true to its seal, 3280.606(a)(9)(i) - grade of trap arm exceeds the diameter of the pipe, 3280.606(a)(5)(iv) - removability of traps, 3280.603(b)(2) - exposed piping, 3280.603(b)(3) - road damage, 3280.603(b)(4) - freezing & 3280.611(a) - venting, general (lack thereof). As the trap arm is sloped at a 45° angle, and the HUD code regards 45° to be vertical, there's no doubt that this is a "S" trap; and will probably siphon the shower it serves.

There's also no question that this is aftermarket as manufacturers buy fittings in bulk and don't have paper labels on them. Also the repair tape leads me to believe that someone had to cut into the belly to make install the plumbing.

Way to much debate on this one guys in my opinion. Doesnt matter what you decide to call this installation. It needs a vent. Mechanical is better than nothing. Looks like owner added a fixture above (shower or utility sink) drain is 2" and a 2" trap can be cleaned from the drain outlet if need be. This trap has a union if it would need to be disconnected. The drain connection IS a combo so that is fine and to code specs. Installation would be improved by extending the verticle pipe of the fixture longer to remove the andle of drain piping (however the angle is acceptable) by lowering the outlet side of the trap and going to a more "horizontal" pitch the owner would then have the ability to install a mechanical vent. If in fact the drain is in a location that would freeze then something would have to be done regarding that but otherwise it is fine.