Drain taps exiting outside house??

[Drunkn Munky]

I have 2 drain taps that exit outside the back of my house, im assuming that they are the flow and return for the central heating system but why do i have 2? Surley i only need 1 to drain the system?

 

[Jimbob]

I have 2 drain taps that exit outside the back of my house, im assuming that they are the flow and return for the central heating system but why do i have 2? Surley i only need 1 to drain the system?

Unless the pipes are linked at a lower level, not all the pipework would drain. I can see why it was done, but i wouldnt of done it. Bit overkill

 

[Bernie2]

No two are better, it depends how the pipework is run. The idea of a drain off is to drain at the lowest point but often one leg drains down to empty, but the other leg is still partly full. So they put two drain offs on.

But make sure they are drain offs.

In old hoses built before natural gas i.e the 70's a pipe with a plug in was often put to the outside to drain water out of the gas pipe. The town gas was made partly with steam which condensed out and laid in the pipes. In those days we installed gas pipes with a fall on to trap the water.
They where drained off every so often as they could freeze and split the pipe if they weren't.
The same thing applied to iron gas pipe but they also had rust pocket legs.

 

[Winston]

Is it not a requirement now that all rads on the ground floor have drain off points?