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[daryon]

Hi All,

Hopefully this is a quick topic with an easy answer. When using FLARNET you input the PSV orifice designation but you don't state the inlet and outlet connection sizes. Often PSV inlet and outlet piping is one or two standard pipe sizes larger than the PSV connetion and therefore reducers are used up and downstream. THere is no option in the FLARENET pipe fittings library to input a reducer. What's the best approach for accounting for the reducers?

I've just been checking a FLARENET model and comparing the models equilvalent lengths with calculated equivalent lengths determined from piping isometric drawings and some pipes are short. There's one PSV (2J3) tailpipe in particualar, it has 3" x 6" reducer on the outlet. The Eq. L of the tailpipe calculated by FLARENET is significantly shorter than the hand calaculated Eq. L and i think its because the reducer hasn't been accounted for. I get a Eq. L of 84 m for the reducer.

Is the best thing to do calculate Eq. L for reducers and add this to the striaght pipe length for FLARENET tailpipe?

Or is it better to connect the PSV in FLARNET to a short 3 inch pipe and the connect that to 6 inch pipe, doing this you would have to calculate theta for the enlargement (i get 32° for 3" Schd 80 x 6" Schd.40 reducer) and input the length. If you have to calculate theta and find the reducer length you might as well go the whole hog and work out Eq. L and save yourself a load of extra pipes and connectors in the FLARENET model.

Any advice? I am missing something in FLARENET that allows you model reducers easily?

Appreciate your help with this one

Edited by daryon, 03 September 2009 - 09:08 PM.