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Title: Application Of Low Power Flow Ccmputers
Author: Steve R. Cree
Source: 1990 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1990
Abstract: Some eight years ago low powered flow ccmputers were introduced and required to prove themselves in three major areas: accuracy, reliability, and cost effectiveness. Electronic gas nfeasuretnent (EOyi) today is maturing in all three of these important aspects of use. Lets briefly look at each one. Accuracy, or irore accurately stated, acceptable accuracy is for the most part considered an achieved goal. (Extremely small ccmbined uncertainty numbers are available for correspondingly large price tags.) Most knowledgeable measurenent people have long recognized the improvements offered by once per second sampling of static line pressure, differential pressure and flowing temperature, coupled with once per second calculation of the flew extension, upon which all volume calculations should be based. The mathematical ccmparisons between circular chart integration methods and on site electronic methods of performing the basic flow equation are readily seen. They have been ccnfirmed repeatedly by various independent and corporate testing entities. The technology is being further advanced in several industry conmittees, nxjst notable of vrtiich is that of the API. Calculation methodology is currently under review with a focus on several issues, including sample rates, calculation intervals, data storage and audit, to name a few. The need for standards is apparent in every sector of our industry. A standard cubic foot of gas in an diio steel mill should be the same standard cubic foot of gas that was measured as it left a production platform in Louisiana. The vKrk, rfiile laborious, is growing vital as EC34 matures, and manufacturers continue to provide inter-corporate acceptable measurement information. As accuracy standards are elevated, so too will the flow ccmputers performance be elevated. New flow ccmputers for the new user will keep pace. For those vrtio have enjoyed the ccmpetitive advantages of flow computer units for years, retrofits and upgrades will be made available by nonctisolescence oriented manufacturers on a cost effective basis.

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