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Title: Experimental Test Results Presented For Field-Damaged Orifice Meter Plates
Author: Raymond G. Teyssandier, William E. Chisman III
Source: 1985 Appalachian Gas Measurement Short Course
Year Published: 1985
Abstract: Normally, all natural-gas metering is conducted at differential pressures which are well below the region where permanent deformation of the orifice occurs. There are times when due to unusual operating conditions, the pressure difference across the plate will be above the elastic limit, causing permanent damage. This resulting deformation could exceed the flatness limits of 0.010 x D - 6)12 in. allowed In the current standard ANSI/API-2530. If this occurs, it is possible that either the flow coefficient or the basic orifice factor and Reynolds number factor will no longer conform to the predicted values of that standard. This would mean that the throughput of the orifice meter could be somewhat different than that indicated. At least two attempts have been made to predict this additional uncertainty or bias in the coefficient. But these predictions have not been globally tested. Thus actual coefficient determination requires flow calibration.

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