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Title: Instrument For Determining Specitic Gravity II
Author: A. R. Kahmann
Source: 1987 International School of Hydrocarbon Measurement
Year Published: 1987
Abstract: C o m p u t a t i o n of n a t u r a l gas f l ow volume, when measured by o r i f i c e m e t e r , is made by u s i n g the formula Qv C X hwPf where Qv is t h e q u a n t i t y , hw i s t h e d i f f e r e n t i a l , and Pf t h e a b s o l u t e s t a t i c p r e s s u r e, w i t h C being a c o n s t a n t . The c o n s t a n t C is o n l y c o n s t a nt for a c e r t a i n s p e c i f i e d s e t of c o n d i t i o n s , and in p r a c t i c e is made up of numerous f a c t o rs i n c l u d i n g the b a s i c o r i f i ce f a c t o r , the R e y n o l d s number f a c t o r , t h e e x p a n s i o n f a c t o r, t h e p r e s s u r e base f a c t o r , temp e r a t u r e base f a c t o r , flowing t e m p e r a t u r e f a c t o r , s p e c i f ic g r a v i t y f a c t o r , s u p e r - c o m p r e s s i b i l i t y f a c t o r and manometer f a c t o r . In order to d e t e r m i ne t h e s e f a c t o r s t h e v a l u e s of t h e q u a n t i t i e s from which they a r e d e r i v e d must e i t h e r be a s s u m e d or m e a s u r e d . This p a p e r w i l l d e a l w i t h t h o se i n s t r u m e n t s measuring s p e c i f ic g r a v i t y . (For f u r t h e r d e t a i ls of the flow computation r e f er t o t h e l a t e s t A.G.A. Gas Measurement Report.

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