Plumbing type advice required... Come on, PH!
Plumbing type advice required... Come on, PH!
Author
Discussion

Dibble

Original Poster:

13,157 posts

257 months

Sunday 28th February 2010
quotequote all
We are having some plumbing problems chez Dibble.

The bathroom sink doesn't seem to be emptying properly. I've stripped dwon the internal u-bend/trap, and that's clear. The pipe through the wall from the inside to the putside is clear, as is the external elbow and down pipe into the drain itself.

I've degunged all the external drains (by hand, and then a hefty dose of plumbing sulphuric acid), and they're all running freely.

The sink in the bathroom still isn't draining properly. The only thing I can think of is there's some sort of airlock. Should the end of pipe into the drain outside be below the water in the outside trap?

Any suggestions?

miniman

28,605 posts

279 months

Sunday 28th February 2010
quotequote all
Does it have a plug or a popper waste?

Dibble

Original Poster:

13,157 posts

257 months

Sunday 28th February 2010
quotequote all
miniman said:
Does it have a plug or a popper waste?
Plug. When I run the hot tap, the sink fills, then drains once it's full (ie a decent head/pressure of water), which is what make me think's it's some sort of lock?

TheEnd

15,370 posts

205 months

Sunday 28th February 2010
quotequote all
check the overflow bit, make sure that is clear also

Cock Womble

29,908 posts

247 months

Sunday 28th February 2010
quotequote all
Have you been peeing in it?

Dibble

Original Poster:

13,157 posts

257 months

Sunday 28th February 2010
quotequote all
Cock Womble said:
Have you been peeing in it?
No. Neither have I been stting int in it, and pushing it down with then end of a toothbrush.

Dibble

Original Poster:

13,157 posts

257 months

Sunday 28th February 2010
quotequote all
TheEnd said:
check the overflow bit, make sure that is clear also
Yep, that's clear too.

mgrays

189 posts

207 months

Sunday 28th February 2010
quotequote all
Either somethings blocked... or if it has never flowed it is probably too far from the vent stack. All plumbing starts at sewer and then rises through the house and terminates at the roof with a vent to the sky. If the branch to the sink is too far from this main riser then the water gets more air locked as it tries to flow. Answer is an "air admittance valve" which you can get integrated into traps. This is a check valve that allows air into the pipe when a partial vacuum is caused by the water flow. This is why you get gurgling sinks when you empty a bath... the bath flows too much water and pulls air through the sink.

But first try the unbloking job.. get Ariel bio clothes powder (or strongest stuff to hand) and a kettle of hot water.. .add powder down sink hole.. as much as you dare; 2-3 spoons full.. then hot water.. leave for 15 mins.. then fill sink. Pull plug when full and the "head" of water will push slug of crude down sink.. Note pouring hot water is dangerous etc etc

Dibble

Original Poster:

13,157 posts

257 months

Sunday 28th February 2010
quotequote all
mgrays said:
But first try the unbloking job.. get Ariel bio clothes powder (or strongest stuff to hand) and a kettle of hot water.. .add powder down sink hole.. as much as you dare; 2-3 spoons full.. then hot water.. leave for 15 mins.. then fill sink. Pull plug when full and the "head" of water will push slug of crude down sink.. Note pouring hot water is dangerous etc etc
As per the OP, the whole thing from sink to drain is clear, as are all the drains.

Cock Womble

29,908 posts

247 months

Sunday 28th February 2010
quotequote all
Are you sure you've not been peeing in it?

Dibble

Original Poster:

13,157 posts

257 months

Sunday 28th February 2010
quotequote all
Cock Womble said:
Are you sure you've not been peeing in it?
Absolutely positive. I have a number of perfectly functional wardrobes for that.

Cock Womble

29,908 posts

247 months

Sunday 28th February 2010
quotequote all
You realise this thread's going to be relocated, don't you?

Deva Link

26,934 posts

262 months

Sunday 28th February 2010
quotequote all
Dibble said:
Should the end of pipe into the drain outside be below the water in the outside trap?
No!

Dibble

Original Poster:

13,157 posts

257 months

Sunday 28th February 2010
quotequote all
Deva Link said:
Dibble said:
Should the end of pipe into the drain outside be below the water in the outside trap?
No!
So the simple solution is saw a couple of inches off so it's above the standing water in the outside trap?

Dibble

Original Poster:

13,157 posts

257 months

Sunday 28th February 2010
quotequote all
Cock Womble said:
You realise this thread's going to be relocated, don't you?
I'm slighty concerned which type of specialist sub forum this would end up in...

Shaw Tarse

31,817 posts

220 months

Sunday 28th February 2010
quotequote all
Dibble said:
Cock Womble said:
You realise this thread's going to be relocated, don't you?
I'm slighty concerned which type of specialist sub forum this would end up in...
Homes Gardens & DIY?

blondini

477 posts

195 months

Sunday 28th February 2010
quotequote all
Should the end of pipe into the drain outside be below the water in the outside trap?

Don't think so and if it is, then this may well be causing the problem. Maybe the outside trap has become partialy blocked and is backing up to a higher level?

Deva Link

26,934 posts

262 months

Sunday 28th February 2010
quotequote all
Dibble said:
Deva Link said:
Dibble said:
Should the end of pipe into the drain outside be below the water in the outside trap?
No!
So the simple solution is saw a couple of inches off so it's above the standing water in the outside trap?
Yes. Even if that isn't causing the problem the waste pipe shouldn't terminate below the surface of the water in the gully.

Dibble

Original Poster:

13,157 posts

257 months

Sunday 28th February 2010
quotequote all
Deva Link said:
Dibble said:
Deva Link said:
Dibble said:
Should the end of pipe into the drain outside be below the water in the outside trap?
No!
So the simple solution is saw a couple of inches off so it's above the standing water in the outside trap?
Yes. Even if that isn't causing the problem the waste pipe shouldn't terminate below the surface of the water in the gully.
I'll get hacksawing then. But how come it's only just become a problem?

Deva Link

26,934 posts

262 months

Sunday 28th February 2010
quotequote all
Dibble said:
Deva Link said:
Dibble said:
Deva Link said:
Dibble said:
Should the end of pipe into the drain outside be below the water in the outside trap?
No!
So the simple solution is saw a couple of inches off so it's above the standing water in the outside trap?
Yes. Even if that isn't causing the problem the waste pipe shouldn't terminate below the surface of the water in the gully.
I'll get hacksawing then. But how come it's only just become a problem?
Could the water level have risen in the gully? Perhaps the drain pipe has been pushed further down so it's now below the surface?