The process in the pipe is a no-work expansion(delta h=0). And, since you have insulation and are assuming no heat loss, h2 will equal h1. Do a steam table look-up at p2 and h1 to find the specific volume and temperature at point 2. Then use the mass flow, point 2 specific volume and pipe area...
Regarding forming of pipe bends, I seem to recall that the code (B31.1) requires verification of the wall thickness in the various parts of the bend. Do you guys remember if this is true, and if so, how are those using the process verifying wall thickness? Also, do you check every bend or only...
