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Title: Interpretation Of Wide Differential Patterns
Author: Lloyd Pettlcrew
Source: 1986 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1986
Abstract: Probably one factor which contributed more to the entry into the market place of recent innovations Such as turbine meters and/or flow computers is the difficulty in resolution of an accurate gas volume from an oscillating differential pattern on the orifice meter chart. Most knowledgeable measurement personnel will concede that an orifice meter station, when properly designed, installed, and maintained, will do an excellent job of inferring onto a circular chart the true volume of gas passing through the station. Unfortunately, this is only part of the success story, since an accurate reading of the recorded chart values must be accomplished to achieve a true volume report. Electronic gadgetry and computer utilization have greatly enhanced the ability of our modern chart departments to compute volumes from orifice meter charts. We are still faced, however, with the same interpretation problems we encountered with mechanical integrators, or with sight-read charts. The wide wash charts are still being produced and we still are generating arbitrary volume computations from these charts.

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