Vent pipe for Septic tank in Garden

[pgs0971]

Hi, I have an old septic tank which seems to be operating effectively. However, the vent pipe is about 1 to 1.5 metres high and in the way of where I want to put some decking.
To avoid any nasty smells in this area I was thinking of re-routing the pipe.

e.g. Could I cut the pipe low to the ground, add an elbow and extend the pipe underneath the decking and then add another elbow to raise the pipe vertically to 2 metres or higher?

Would the extended distance cause any ventillation issues ?

Many thanks
Pete

 

[Burnerman]

No problems with that one so long as the tank doesn't overfill.....my own (brick) tank doesn't have any vent pipes and seems to cope well enough with the gaps between the concrete lids.
John

 

[pgs0971]

Can you tell me if there is a specific material I should use or would something like PVC drain pipe be sufficient.

Thank you

 

[Burnerman]

The usual PVC drain pipes will be ideal here.
Enjoy!
John

 

[pgs0971]

Just another quick question on this. The vent pipe and clay fixing at its base was broken and came away leaving an angled clay pipe exiting the septic tank about 8" below ground. I have looked at the option of a pan connector which would appear to be a good fit in the clay pipe which I could then use to connect to drain or soil pipe and extend as planned.

What I was wondering was, would an air admittance valve do the job of the vent pipe or is this the reverse of what I need (hence vent pipe)?
If an air admittance valve was the answer could I fit this low down (below the planned decking) eliminating any smells?
Thank you

 

[wastetech]

You are correct - it is the reverse of what you need.

The vent pipe will only draw for up to 10 metres away from the septic tank, so it needs to go vertical before that distance,

The pipe must be rising all the way with no horizontal sections. Think of it as a chimney and ask - if it was a fireplace chimney, would it draw well?