Can anyone give an idea of the formalised/ governement approved training and education structurea and material available in their country ? I know that the UK, for instance, has certain requirements which have to be satisfied by people in the industry. At the same time, training is available...
Dear Marokki
I have used a HDPE liner which is cast into the inside surface of the manhole. This enables you to weld the incoming pipe, to the liner, while still retaining the structural attributes of the manhole. A bit more costly but waste liquid manholes are things you do not want to have...