Mafic can be used for : gas pipe, insulated gas pipe, gas bridge, liquid bridge.
Mafic cannot be used for : liquid pipe, insulated liquid pipe.
It's weird to be able to use Mafic for liquid bridge but not for liquid pipe.
Avoid us to be able to use Mafic for liquid bidges, as for liquid pipe, or better, make us able to us Mafic for standard & insulated liquid pipe.
As it is actually, it lacks common sense & logic.