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Title: Orifice Meter Installation Effects: Effect Of Variable Spacer Length Between Two 90 Ells Out-Of-Plane
Author: T. B. Morrow, E. Kelner
Source: American Gas Association 1998
Year Published: 1998
Abstract: This report presents the results of 4-inch (102-mm) orifice meter installation effects tests performed in the Gas Research Institute Metering Research Facility High Pressure Loop flowing natural gas. Orifice meter flow calibrations were performed to investigate the effect on discharge coefficient of varying the spacer distance (straight pipe length) between two 90 elbows arranged in an out-of-plane configuration for bare meter tubes. Tests were performed for upstream meter tube lengths (A) of 17, 29 and 45 pipe diameters (D) for orifice diameter ratios (b) from 0.40 to 0.75. Values of straight spacer lengths (s) between the first and second 90 elbows were: 1.6 D, 5 D, 10 D and 15 D. Figure 2-6 of A.G.A. Report No. 3, Part 2, specifies minimum meter tube lengths for bare meter tubes downstream of two 90 elbows out-of-plane separated by a straight spacer length less than 10 D. The test results for straight spacer lengths of 1.6 D and 5 D indicate that the minimum upstream meter tube length specifications in Figure 2-6 are too short and require revision for some b values. However, the minimum upstream meter tube length specifications are adequate for straight spacer lengths of 10 D and 15 D.

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