Kitchen waste pipes

[Uggie]

Hi
I have an internal manhole As my extension was built over the top of an existing manhole in an area where I now want to relocate my kitchen.

My question is this

Am I able to connect my kitchen sink waste pipe directly in to the manhole as this is the shortest route for drainage.

Any advice would be very welcome.

 

[ree]

I assume that you are proposing to trench down through the "kitchen"/extension floor and connect to the manhole?

Are you also proposing to tie-in the wet appliances to the sink waste before dropping into the floor drain?

Typically, its best to run wastes above ground to external gullies - there must be at least one gulley taking the extension roof RWP?

Why not scan a plan view of your extension/proposal indicating MH and sink and appliance and gulley positions?

 

[Uggie]

Kitchen layout

• Uggie
• 9 Feb 2014
• 2

Sorry about the poor sketch.

I was thinking about putting the 40mm dia sink waste straight to the manhole but I am concerned that this is not good practice and the bco might not be too impressed with my proposal.

My thoughts today are to put in a new underground pipe 110mm dia into the manhole and a new gully close to the sink for the waste.
Could this be an internal gully or does it have to be external?

 

[tony1851]

The pipework used for appliance wastes is not suitable for use below ground, so I suspect your inspector would not accept running your 40mm pipe direct to the m/h.

The correct way would be to run a 110 pipe below the floor to the m/h, and turn it up to floor level, fit with an adaptor and feed your waste into that (there would of course need to be a trap at the appliance).

Uncle Sam suggested taking the pipe to an external rainwater gulley,
Strictly that's not allowed because you are putting foul waste into what may be only a surface water system. But between you and me and the internet, that's exactly what the majority of people in your position end up doing.

 

[Uggie]

Thanks Tony

I agree that this is probably the best solution.

Thanks again