25-11-2016, 11:22 AM
Large bore pipework is fine, but not on the vertical rise. The volume of water in the pipe is greater than the volume of the box, so when any service is due there is far too much water to get rid of without flooding the place. Also there is the question of inertia getting the vertical pipe to commence flowing at a velocity to carry the waste, the pumps are not displacement pumps but impellers and it seems to make a difference. 22mm pipework on the rise is prefered.
I could cite an installation in a large shopping mall where there was around 40 metres of 104mm pipe falling the wrong way concealed in the ceiling. When the box was opened, releasing the non return valve, to unblock the machine ( fitted stupidly in a baby changing loo so full of nappy liners ) The s**t was everywhere!
I could cite an installation in a large shopping mall where there was around 40 metres of 104mm pipe falling the wrong way concealed in the ceiling. When the box was opened, releasing the non return valve, to unblock the machine ( fitted stupidly in a baby changing loo so full of nappy liners ) The s**t was everywhere!
Boater Sam.
