Hi all - need to connect a new line into my septic tank. The new line needs to come out and then "Tee" in opposite directions to get to the new plumbing "inputs". It's sized appropriately, but my question is for a horizontal application, what fitting do I use at the "tee" junction? I am pretty sure it's not a Tee, but not sure if it should be a double wye, a double long sweep, or something else?

Am going to try and draw it below with text...


Garage.............Apartment
<-----------T---------->
................|
................|
................|
................|
................|
................V
.......... SEPTIC

Ignore all the periods - they are just there for spacing...
What fitting goes where the "T" is above? (all pipes are horizontal, and will have 1/4" / ft fall)



Thank you in advance for any help!



-randy

Using a double sanitary tee vertically is just fine, only vertical to horizontal and horizontal to horizontal changes in direction requires a long sweep

You need TWO 'Y"s next to each other for that type of connection.

Can he use a double combo fitting and put a 90 elbow into the middle for a cleanout?

If he can find one for SDR pipe.

[www.harcofittings.com]

[www.ferguson.com]


OR


adapt from sdr to pvc THEN use a double combo

==============================================

"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

I didn't say they were not made, i said, "good luck" finding one.

...... i see your point ......

==============================================

"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

Bern, why are they so expensive? I think it is a ripoff. I would stay away from installing that system.

There are a LOT of reasons for staying away from that system, but price is not one of the major ones.

So I am obviously new to this - is the "system" you are referring to the SDR35? If so, why would you stay away from it, and do you have a different one you would recommend? I am not married to it, it was just suggested by the septic guy.


Thank you!

SDR pipe and fittings are EXTREMELY thin and will crush, deform, and break if subjected to stress. The pipe is cheap, butI would ONLY use schedule 40 pipe and fittings.

for the OP:

(hj, please comment on my plan)

run the fixture branches in PVC DWV

use a double 'combo' with a c/o on the end extended to grade

or

use a double 'y' and two 1/8 bends (45s) with a c/o extended to grade on the end

all in PVC DWV

THEN, depending on length of run, switch to SDR UNLESS there will be additional EXPENSIVE fittings



IMO, you can use cheap SDR because in Arizona you don't have to excavate deep

but

make SURE you compact the bed of the trench and backfill over the pipe with SAND wetting it down as you go

==============================================

"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

I AM IN ARIZONA, and I cannot tell you how many SDR sewers I have had to dig up because they have flattened out, cracked in two, or been deflected because of tree roots, regardless of the depth.

i defer to your experience in arizona



==============================================

"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

that is interesting, because it is my understanding that one of the reasons SDR piping are used outside is they are less likely to break/crack due to settlement or being driven over because they are thinner and more "flexible". I remember reading about SDR being preferred if it's being buried under a driveway. May be it doesn't work like that in practice.

THey also claimed "bituminous fiber" pipe was the greatest thing to replace cast iron that they had ever developed, and we know how that turned out.

the theory and the actual practice of back-filling are WORLDS apart



theory:

layered, compacted sand set around the pipe on a COMPACTED base


practice:

dump any fill you can find in the hole to cover the pipe


;(

==============================================

"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

Thanks, HJ (and all) - sounds like I should likely do sch 40 - it’s not a huge diff money-wise, and I don’t want to do it twice!

I appreciate all of your input and help!

-Randy



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