- #1

gfd43tg

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## Homework Statement

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

## Homework Equations

## 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.