New kitchen, drainage advice please

[rhino666]

Why do you need a hopper?
Can you just not connect it to the drain directly.

The connection into the hopper will be at the required angle.
They are made that way

Ahh right, so the port for the 40mm pipe on the hopper is at an angle; that makes sense, just looks straight in the part photos I have seen and I don't have the part here to refer to.
I was told that the way to handle a sink and dishwasher drainage in this situation was 40mm pipe going into a hopper and gulley('P' trap) and then on through 110mm pipe to join the main foul water pipe.
Are you suggesting 40mm pipe out through the wall and straight into a drainage pipe? Just thinking that the gulley would stop smells coming back up through but maybe the sink trap would be sufficient in that respect.
The other issue with no gulley, is no access to that section of pipe without digging up the path/garden and dismantling.
Got to say, I think the gulley and hopper or at least something that facilitates easy access to that part of the 110mm pipe section is the way to go?

 

[rhino666]

A couple more questions on the 110mm drainage part of this please.

Am I correct in thinking that the best solution for the sink/dishwasher drainage is 40mm internal into a socketed hopper and 'p' trap gulley?
The gulley trap with hopper fitted straight on would leave the outflow pipe only a short distance underground. The pipe I am running to is just over three metres away and perhaps 750mm underground. Am I right in thinking that it is quite usual to extend the hopper height with socketted pipe or pipe and a coupler with 2 sockets?
a 45 degree junction with 3 sockets is what I am thinking of to join the main 110mm pipe run. Am I able to fit the 3 socket junction into a pre-existing pipe run or would I need to lose a socket and join with a rubber sleeve or similar? Just thinking that there is not enough room/flexibility to insert this into fixed pipe so both sockets have enough pipe inserted?

 

[oz-plumber]

For the main drain connection you would need a couple of slip couplings.

Work from there back to you location of the drain coming out of the wall.

Keep the p-trap gully on the same grade as the drain and just intall a riser pipe to the level required.

 

[rhino666]

For the main drain connection you would need a couple of slip couplings.

Work from there back to you location of the drain coming out of the wall.

Keep the p-trap gully on the same grade as the drain and just intall a riser pipe to the level required.

Thank you for your reply. Do you reckon I might get away with one socket and one slip coupler on the junction insert or do you definitely recommend two slip couplers?
The riser pipe you mention, is that just 110mm pipe with a socket or 110mm pipe with a coupler?
I thought my idea of the 40mm pipe going under the floor and out, so no pipe exposed outside was a good idea but others I have spoken to today suggest it is better to go higher out through the wall, above the floor and drop the pipe straight into the hopper. Obviously this would mean pipe showing outside but maybe its the best solution?

 

[plumberservices]

Why do you need a hopper?
Can you just not connect it to the drain directly.

The connection into the hopper will be at the required angle.
They are made that way

Correctly said. Connecting the trap to the drain directly is the most reliable option.

 

[rhino666]

Correctly said. Connecting the trap to the drain directly is the most reliable option.

Thank you for your input. The 'P' trap was always going to be connected directly to the main 110mm foul water drain pipe.
Is that what you meant?