Re: steam flow calculations

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Posted by David on December 10, 1999 at 09:30:11:

In Reply to: steam flow calculations posted by david webb on December 01, 1999 at 18:50:39:

: I am looking for calculations that would predict the maximum flow through 8-12 inches schedule 120 pipe.
: I have at my disposal 500,000 lbs/hr at 400 psi.
: need details of calculations!

Calculations from stateng;

The formula for steam line flow;
Q=FPM x A/ 2.4 x sV

FPM= velocity per min
Usually a steam line will be design for "FPM" velocity of 6000 FPM (feet per minute) with future considerations that you may go up to 12000 FPM. If you have superheated steam the velocity can be increase. Saturated steam will wear out the pipes and fittings with the movement of high velocity water droplets condensate carry over etc , also noise will increase at a higher velocity.

A= Inside area of the pipe

sV =specfic volume of steam per lb at the pressure flowing.

Example calculation; 12 inch pipe inside diameter 11 inches,400 psi steam sV 1.12,FPM 12000

12000x11x11x.7854/2.4x1.12=424,256 lbs per hour.

There is other considerations that should be taken into account. With out knowing all the facts about the application, is this the kind of information your are looking for.

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