G2 limitations - pipe under 2" but main line is welded

[G.P.]

As a licensed G2 fitter, are we able to go into a facility that has welded pipe on their main supply and work on the branch supply lines (under 2") serving appliances under 400K BTU?
I.E. Replacing a hot water tank, or adding a new one to a branch line under 2"?

[viking]

Yes. G2 limitations are appliance input not size or type of piping.
Even a G3 can work on piping up to 2" under general supervision.

[G.P.]

Thanks viking, that is what I figured. Cheers!