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Title: Relative Density Specific( Gravity) Measurement
Author: Marsha C. Yon
Source: 1992 International School of Hydrocarbon Measurement
Year Published: 1992
Abstract: Todays demand for real time accurate gas measurement has led the industry to take a closer look at every aspect of the measurement system including the flow calculation and each instrument which contributes information to the calculation. Gas is no longer obtained from long-term known sources. Therefore, gas quality cannot be assumed to be stable and fixed-faclor measurement is becoming obsolete. Open access and new transportation agreements have added to the need to continuously monitor variables like relative density rather than accept periodic laboratory results from gas samples for the determination of the needed current flow and energy information. Technology is now available tor relative density measurement which offers higher accuracy and continuous digital signals for direct input to microprocessor-based flow computer and gas control systems.

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