I'm gonna call BS on this comparison, as you wouldn't keep turning on and off the torch on an install. you would fit it all up then burn all at once. Especially since you already know where your hangers and supports will be. The other issue with factory installed pipe is when we install vav boxes there is not always room in that direction for the pipes, most installs will need custom piping especially if its a remodel.
I'm gonna call BS on this comparison, as you wouldn't keep turning on and off the torch on an install. you would fit it all up then burn all at once. Especially since you already know where your hangers and supports will be. The other issue with factory installed pipe is when we install vav boxes there is not always room in that direction for the pipes, most installs will need custom piping especially if its a remodel.
I was going to say the same thing about torch on and off.