Using sewage station above ground

[NandM]

Above ground sewage stations seem to come at a premium, so I'm wondering if I can use a below ground one above, or even partially underground to save on the digging.

 

The bathroom I'm adding to the garden room is currently about 30cm above ground level - I could probably raise this another 10-15cm internally. I've seen some of the underground stations that have the inlet very close to the bottom - so if I have the drop, then what's stopping me from using one of these above ground? e.g. clickity and click

[Russell griffiths]

You actually want a tank full of poo sitting on top of your garden. 
what are you going to do with the outlet pipe, just clip it to the fence and grow some ivy up it. 
 

Nope, put the proper underground one in and you will be left with a neat inspection chamber lid, nothing else to see. 

[NandM]

I wasn't planning to bury the mdpe underground to start as I have a run of around 65m to the front garden. Current temporary plan is to follow the hedge up the garden and then through the back of the garage and into the main inspection chamber at the front of the house.

 

Once we have the new sewers put in as part of the house extension, I could route underground like the blue line and have the mdpe terminate into a 110mm pipe underground.....and bury the station. But I need everything working before the demolition starts. 

 

 

Edited February 10 by NandM

[Russell griffiths]

If your planning on putting it underground eventually, then why can you not put it underground now, just have the mdpe running above ground until you build the extension. 
 

what am I missing. 

[NandM]

I think just laziness on my part! I'll bury it and keep the pipe overground for now as per the blue line.

[Jenki]

I don't think structurally they would be suitable, during install, you partially fill with water and then backfill, my instructions were very clear, fill say 300mm with water then backfill to that level, and repeat, DO not fill the tank with water without following the instructions.

 

[saveasteading]

4 hours ago, NandM said:

what's stopping me from using one of these above ground?

As @Jenki says. The underground tank is supported by gravel or concrete as specified. 

If that tank is used above ground then the internal pressure is not evenly distributed or supported,  and the tank will distort then break.

So above ground it would be thicker material, and probably have fins within it. 

Plus the chemistry is different for UV protection, or again it will fail.

It must be underground and built as spec. OR buy an above ground version at greater cost.

 

Some tanks are made to shallower  profiles and so are not so deep in the ground, and/or can be buried deeper and have an extended shaft up to ground level.