Tee pieces on the horizontal

[ash_scotland88]

Looking for advice on a product/plumbing.

 

We have big old deep hand wash sinks. There are two of them and they're side by side, so obviously two drains.

They currently do their plumbing thing (traps, elbows etc) but then come together where they exit through the wall. The hole through the wall is not quite centered to the sinks.

The tee piece currently in use has the preferred flow route on the longer horizontal run, the other side still sloping down slightly due to the angle of fall, so perhaps prone to stagnant water?

 

Having to redo the waste to allow proper appliance draining, is there anything better to use?

 Small bit of knowledge is to avoid the lower run but I'm not sure how to best design it.

 

https://ibb.co/x1CRMKn

https://ibb.co/g9LD4W0

Edited September 4, 2023 by ash_scotland88

[Big Jimbo]

Any chance of putting a second outlet through the wall to keep them both independent ? Either that of 1 exit hole lower down to give you a bit of scope for sloping down to it better. Neither idea any good if the pipe going through the wall goes straight into a soil stack ?

[ash_scotland88]

14 minutes ago, Big Jimbo said:

Any chance of putting a second outlet through the wall to keep them both independent ? Either that of 1 exit hole lower down to give you a bit of scope for sloping down to it better. Neither idea any good if the pipe going through the wall goes straight into a soil stack ?

It goes straight into soil stack, had the cover off and you can see the old lead and newer plastic.

 

Do both sinks and appliance standpipe all need separate traps? The whole thing can be redone, needs it anyway as it's only 32mm.

I think this is the best way I can draw it without going 3D...

https://ibb.co/hLFbF7s

 

There's probably some extra straight sections I've missed, I know the appliance length between the tee and 90 will need an extra 90 to go around a corner.

[ash_scotland88]

Not sure if the part exists but can you get a 32mm BSP to compression fitting elbow?

The BSP side has to be the type that screws onto the bottom of plug hole, like a trap. I'm not confident it does.

If not it's the same diagram as above but 3xtraps instead of 1.