Inspection chamber problem - Problem

[paulthebrilliant]

HI,

Please could someone give me some advice? i've been given conflicting info from so many builders now its doing my head in.

We are having a block paved drive, and before its done i'm trying to fit 2 new traps and pipework to the old 4 inch clay drain. There are two traps, both coming from sinks, they need to join at a plastic chamber base then that joins to the old clay pipe.
The problem is that the only place i can put the chamber is right by one trap, which means the other traps pipe has to join the chamber at 90 degrees, is this allowed?

heres a blocky drawing.
[IMG]http://www.sullyworld.co.uk/pics/pt1.jpg/IMG]
http://www.sullyworld.co.uk/pics/pt1.jpg


I also noticed a pic on a website where they have done what i am trying to do, with the water doing 180 degrees on itself
see here
http://www.southwestdrainsltd.co.uk/blocked....sh.html

is this 'allowed'? i mean to have a pipe approach a chamber base then join using a 90 degree bend?

please help!

PAul the stupid

[Dave_L]

That's absolutely fine Paul

[engcon]

As long as the bend is by the manhole and not in the run that should be fine as you can reach in and grab out any blockage if there was one

[paulthebrilliant]

that's great , thanks for the advice.

One more question, it it ok to have a 15 degree bend in the pipe on the way from the trap to the manhole?

both traps are roddable bottle traps.


Paul

[Dave_L]

Yes, that is fine too.

[paulthebrilliant]

Thanks for the advice, i really appreciate it.

Just one more thing. What can't you do on a run from a roddable trap to an inspection chamber? In terms of bends?

[seanandruby]

Any change of direction should be done inside a manhole, or inspection chamber. If i have to introduce a bend outside a manhole it would'nt be a ninety but a long radius made up of slower bends. of course we occasionly bend the rules if we can't fit runs in because of obstacles, that said, any correction bends in a run should be kept to a minimum made up of slow bends.

[paulthebrilliant]

I think i can get the pipe to approach the chamber at an angle so that i can use a 45 degree bend to join the two. and the pipe to the trap
will need a slight 11 degree bend ( or something like that ) as there are pipes in the way.

Ive not got much choice because of the way the drive is, does it sound plausible to you?

[lutonlagerlout]

as Sean mentioned you want to be using easy bends of say 15 degrees to make a slow arc to the inlet

45 is too sharp for underground and would prove difficult to rod
LLL

[paulthebrilliant]

So is this pic on tis website wrong? they have water coming at 90 degrees?

http://www.southwestdrainsltd.co.uk/blocked....sh.html

[seanandruby]

Brill, that picture is a fine example of how not to do drainage. I have been laying drains for 40 years and never placed a ninety on a run, 'cept, obviously for the pop up. It wouldn't be roddable like that and any debris accumalating there could result in a dig down to repair, making it very costly. i have dug down on some to take out pieces of offcut timber, plastic bottles, beer cans etc: I actually witnessed a guy place one half way down a run, waited until he finished, back filled, concreted and then made him take the lot out :;):

[paulthebrilliant]

Now i'm really confused.

Dave L says it's fine and you say it's not?

This is how i need to connect the traps, both traps are roddable, the longest away trap is 2.5m away so a rod would come right to the bend on the chamber?

have a look at this drawing :
http://www.sullyworld.co.uk/pics/pt6.jpg

i need to do it like this because the clay pipe is embedded in a ton of concrete and where the trap is is the only place to connect to it.

Im really stuck as to what to do here as there seems to be no alternative. The waste going down the traps is just water from a sink and from a dishwasher


Paul the confused.

[Dave_L]

Just make any bends as gentle as possible (as has been said) outside of the inspection chamber and you'll be fine Paul. Sometimes you have to accept that it isn't always ideal. There are far more important things to worry about in life!

[seanandruby]

That's because Dave is a tarmac contractor for a living and i am a drainlayer. No disrespect to Dave meant by the way. Easy, slow, or gentle are some of the discriptions used and that is the way to go. I can't go against what i was taught but it is up to you really. Have you got any photos of the proposed route?

[msh paving]

just to add my bit, buliding regulation allow a 45deg. bend on inlet and outlet from a manhole as long as it the first fitting,
MSH