unknown pipe

Hi All In my house (newly bought, older)... i have a 3/4" gas line that is split and goes one way to the oven and in another direction to the dryer in the laundry. Therefore the stubs coming out of the wall for both oven and dryer are both 3/4" The main line for these two appliances comes from the exterior wall at 1" for about 30feet, then makes a left and turns into a 3/4" line for about 15". At this 15ft mark, it is T'd and 3/4" continues for about 6ft to stove to the left, and then on the right side goes about 4 ft up, 10ft across, and 5ft down into laundry, still at 3/4" -it is going up, across, and down because of that odd split level living level that is on concrete slab, therefore it goes up and over the ceiling of that slab level and down into laundry wall. Is this ok, is it enough gas to power both sufficiently? Not so much worried about the stove as the dryer. Is the 3/4" pipe ok for the dryer, to be adapted to a typical dryer hookup/fitting- ive seen 3/8-1/2 in the kits and pipe line mentions of 1/2"...? Is this a crazy run? Is it safe? Thanks in advance.

This is part of the drain and overflow 1-1/2" pipe for my bath tub, I needed to replaced the rubber reducer, which is 3" at the base, I found this one, which goes to 1-1/2" but I think it's made for the black plastic pipe which is thicker. I have not seen this reducer sold in a reduction to 1-1/4" which would fit the 1-1/2" white pipe. So... Question is, use what's here and somehow make it work with extra parts, if so, what? Or get a different bath drain pipe kit that's not the white plastic? This is holding up my entire bathroom renovation, help! :)