Antworten
Re: Orifice Plate Sizing
Erstellt am
15. Oct. 2006 - 02:18
I haven't used BS 1042 since 1969 so I'm not sure if e has been dropped out of (any) subsequent (assumed)editions. It used to be included.
ISO, I don't know. ■
John Gateley johngateley@hotmail.com www.the-credible-bulk.com
Re: Orifice Plate Sizing
Erstellt am
16. Oct. 2006 - 04:13
Apreciate if you can advise how orifce plate hole are size. ■
Orifice plate sizing
BS 1042 use a pratical version of equation as follow:-
Q = e x E x CD x A2 x Sq root of (2xD(P1-P2)) where
e - expansion ration or expansibility factor
E - velocity of approach factor = 1/sq root of (1-A2/A1)
CD - Discharge Coefficient = 0.6 for orifice plate
D = Density
P1,P2 - Pressure
Q - Gas Mass Flow Rate
Question:-
a) Does anyone knows how to determine e for both air and nitrogen?
b) ISO 5167 also has an equation to size the orifice. Does anyone knows of the equation and its regression method?
Gerkeil ■