1. The problem statement, all variables and given/known data 1. An emergency vent line from a reactor is 55 feet long and has an inside diameter of 4.026 inches. The surface roughness of the pipe is 0.0012 inches. The line discharges hydrogen to the atmosphere (P = 14.7 psia) a) If the mass flow rate of hydrogen is 95 lb / minute and the temperature is 100 F, what is the pressure within the vessel ? Assume the gas flow is isothermal. b) Could a mass flow rate of 100 lb/minute be attained in this emergency vent line with this vessel pressure ?? Data for hydrogen: μ = 0.014 cP Cp = 3.5 BTU/lb F γ = 1.4 Z = 1.00 2. Relevant equations 3. The attempt at a solution I solved part (a), I assumed subsonic flow, then used the equation shown in my attempt to basically guess P1 until it equaled G. For part (b), I'm a little bit hesistant, because I don't know how the pressure at the discharge could be any lower than atmospheric, hence the mass flow rate is already at a maximum. But I'm a bit hesistant because they gave information about the specific heat, and I am unsure what to do with it or γ.