Saniflo waste pipe - vertical lift AFTER horizontal run

[slantsaman]

Hi everyone,

I'm currently installing a new bathroom and using Saniflo to pump all the waste to the soil stack. However, the waste pipe has a vertical lift of about 40cm at the very end where it joins on to the soil stack. I've read everywhere that the vertical lift should always precede the horizontal run.

What's everyone's thoughts on this?

Thanks,

Ryan

 

[turnpin]

Hi Ryan and welcome....it should lift as it leaves the unit and fall towards the stack ....check the instructions that came with your sani-flo....RPM our resident specialist on the forums will be along soon and will give you the best free advice here about your quirie...... regards Turnpin:welcome:

 

[rpm]

Welcome to the forums Ryan, turnpin is correct in what he said above and 40cm is a big lift. Explain the run to me with distances.

 

[Riley]

Trust this man :iagree:

 

[slantsaman]

Welcome to the forums Ryan, turnpin is correct in what he said above and 40cm is a big lift. Explain the run to me with distances.

The property is a first floor terraced flat and the bathroom is at the front. The waste pipe has already run approx. 8m to the back of the property where it carries on outside for approx. 3m till it lifts vertically and connects to the soil stack behind the wall. Please note that the installation of the Saniflo and waste pipe was done by a plumber and not by me, I merely noticed the vertical lift and remembered reading that it should occur at the beginning and not the end. I will try and attach picture for a better idea of what it looks like.

 

[slantsaman]

 

[rpm]

So basically most of that pipe to the lowest point will be full of water and every time the pump discharges new water the new water has to move the existing water along, this will probably work but for how long is anyones guess.

Without lowering the soil stack connection point the best thing would be to go vertical inside the room followed by a decline of 10mm per metre or at second best the vertical outside asap.

 

[Riley]

Wow a giant trap Surely a big freezing risk as well

 

[rpm]

Wow a giant trap Surely a big freezing risk as well

Thanks, forgot to mention that, yep will need lagging once it`s altered.

 

[slantsaman]

Wow a giant trap Surely a big freezing risk as well

Yeah that was my biggest worry as well, having water sitting at the lowest point as I wasn't sure if the Saniflo would be able to pump all the water through with the vertical lift at the end.

If it's not possible for it to be altered, would lagging the pipes be enough to prevent the water from freezing?

 

[rpm]

In the average winter probably but the pump is being overworked.

 

[Howsie]

That will be goosed in the winter without a shadow.

 

[rpm]

That will be goosed in the winter without a shadow.

Not sure it will last until the winter tbh.

 

[Howsie]

Not sure it will last until the winter tbh.

I didn't like to be too harsh but I think you're 100% spot on there.

 

[rpm]

Just gone back to the photo and have concerns over the amount of clips on the first horizontal section but then read the pipe goes back 8m inside the property so there is around 11m before that rise and sani used to say a maximum of 300mm.

Ryan you really need to get them back and sort it all out with a minimum fall on all the pipe of 10mm per metre.

 

[slantsaman]

Thanks for the advice. I've spoke to the plumber and he has removed the vertical lift and connected it at a lower point. However, he said there's no possible way to connect directly into the soil stack from this lower point and has instead connected to the second bathroom waste water pipe. From the connecting point you can see that it's not too far from the soil stack. Are there any problems with this at all? Like, would the waste be pumped at such a force that it would come back up through the bathtub sink hole?

Thanks again

 

[rpm]

Should be ok now, if you experience problem with the bath then fit a one way valve between the new connection and the bath.

 

[Riley]

Should it still not be insulated rpm or should pipe remain empty now?

 

[rpm]

Thanks I keep forgetting, I'm using the phone so pictures aren't big and can't see the fall of the pipe, certainly wouldn't hurt as 22mm white waste does go brittle from the sun in time