The Pipeline Rules of Thumb Handbook uses the equation(adsbygoogle = window.adsbygoogle || []).push({}); Q = D^2*Pto estimate the flow rate of escaping gas from a pressured line (see link below for excerpt) under standard conditions. Where Q is flow rate in Mcf/hr, D is diameter of the nipple or orifice in inches, and P is the absolute pressure in psi at a near point upstream from the opening.

Looking at the equation with respect to units, I see that the right side has an area multiplied by a pressure, which results in a force.

in^2 * lbs/in^2 = lbs ..... = Mcf/hr ????

But according to the book, we end up with Mcf/hr...not lbs.

Obviously PiplineROT did some sort of approximation and cancellation here that they did not explain, but what is it? How does this make sense?

http://books.google.com/books?id=2D...as blown off through a line puncture&f=false"

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Estimating Gas Flow Rate Through a Line Puncture or Blowdown Orifice

**Physics Forums | Science Articles, Homework Help, Discussion**