I've recently turned my bath through 180 degrees so that the taps are
at the opposite end.

This means that I had to extend the drainage pipe so that it runs the
length of the bath.

I'm also putting a power shower above the bath and am worried that it
won't be able to drain the water away quick enough when using the
shower.

Is there anything I can do to increase drainage?

The U-bend and all drainage pipe work is new so there are no blocks.
My new pipework still runs downhill but only slightly. Is it just a
case of increasing the slop on the pipe or are there any plumbing
tricks that I should be aware of?

Any help would be much appreciated.

Many thanks,

Chris

wrote in message
oups.com...
I've recently turned my bath through 180 degrees so that the taps are
at the opposite end.

This means that I had to extend the drainage pipe so that it runs the
length of the bath.

I'm also putting a power shower above the bath and am worried that it
won't be able to drain the water away quick enough when using the
shower.

Is there anything I can do to increase drainage?

The U-bend and all drainage pipe work is new so there are no blocks.
My new pipework still runs downhill but only slightly. Is it just a
case of increasing the slop on the pipe or are there any plumbing
tricks that I should be aware of?

Any help would be much appreciated.

Many thanks,

Chris


The only thing I can think of that would help, maybe, is the siphon effect,
but paradoxicaly you may need a smaller bore tube to make that work ( no air
can be present in the siphoning part of the drain tube. Might be difficult
to make work, certainly if you're only having a shower. I imagine the big
difficulty would be that the outflow rate would have to match the shower
inflow rate, which might be impossible to achieve. Usually siphons are used
where the outflow and inflow automatically are the same becasue the outflow
rate determines the inflow!

Andy.

In an earlier contribution to this discussion,
wrote:

I've recently turned my bath through 180 degrees so that the taps are
at the opposite end.

This means that I had to extend the drainage pipe so that it runs the
length of the bath.

I'm also putting a power shower above the bath and am worried that it
won't be able to drain the water away quick enough when using the
shower.

Is there anything I can do to increase drainage?

The U-bend and all drainage pipe work is new so there are no blocks.
My new pipework still runs downhill but only slightly. Is it just a
case of increasing the slop on the pipe or are there any plumbing
tricks that I should be aware of?

Any help would be much appreciated.

Many thanks,

Chris

You need to get as much fall as you can, and have as smooth a path as
possible to the stack - for example, using sweep bends rather than elbows.
Is it feasible to raise the bath a bit - maybe put it on a plinth - to get
more fall?

It's not a disaster if it can't keep up with the shower flow - your feet
will just get an extra wash as you shower! g
--
Cheers,
Roger
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On 9 Nov 2006 06:00:16 -0800 someone who may be
wrote this:-

I'm also putting a power shower above the bath and am worried that it
won't be able to drain the water away quick enough when using the
shower.

Most unlikely. You can easily test it though. Work out how much
water fills the bath and then time how long it takes to drain. You
will probably find this is much faster then the shower can put water
in the bath.

My new pipework still runs downhill but only slightly.

That's probably good.

Assuming you have single stack drainage there are maximum slopes for
pipes, related to the diameter of the pipe and length of run. These
maximum slopes are to prevent the trap being siphoned out.

There are also maximum lengths of run and you have just added 1.5m
to the length of run.


--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54

In an earlier contribution to this discussion,
David Hansen wrote:


Assuming you have single stack drainage there are maximum slopes for
pipes, related to the diameter of the pipe and length of run. These
maximum slopes are to prevent the trap being siphoned out.


Are these just recommendations, or mandatory? Where are they documented?
--
Cheers,
Roger
______
Email address maintained for newsgroup use only, and not regularly
monitored.. Messages sent to it may not be read for several weeks.
PLEASE REPLY TO NEWSGROUP!

On Thu, 9 Nov 2006 17:04:56 -0000 someone who may be "Roger Mills"
wrote this:-

Assuming you have single stack drainage there are maximum slopes for
pipes, related to the diameter of the pipe and length of run. These
maximum slopes are to prevent the trap being siphoned out.

Are these just recommendations, or mandatory?

The latter. It is one of the things the Building Control official
will check. You do get one of these to check every new connection to
the drains...

Where are they documented?

Probably in a British Standard. They should also be available in
various books on the subject. Personally, I have a piece of paper by
one of the manufacturers which has the information.


--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54

wrote:
I've recently turned my bath through 180 degrees so that the taps are
at the opposite end.

This means that I had to extend the drainage pipe so that it runs the
length of the bath.

I'm also putting a power shower above the bath and am worried that it
won't be able to drain the water away quick enough when using the
shower.


the bath will never fill up while taking a shower, try it now with both taps
at full pressure and the plug out....even with very high pressure it will
take an age to come even close to halfway up the bath, there's no shower on
the market that can deliver that kind of volume of water

Is there anything I can do to increase drainage?

The U-bend and all drainage pipe work is new so there are no blocks.
My new pipework still runs downhill but only slightly. Is it just a
case of increasing the slop on the pipe or are there any plumbing
tricks that I should be aware of?

the slope on most drains is only 1:40 and even if the pipe is level it will
still find the lowest point which is obvioulsy the outlet, faster than it
can fill up