Analysis of metrological characteristics of elbow flowmeter under rotating state | International Journal of Metrology and Quality Engineering (IJMQE)

Topical Issue - Advances in Metrology and Quality Engineering

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Table 2

Discharge coefficients and prediction accuracy.

Diameter (mm)	Radius to Diameter Ratio	Tapping Position				Relative Error(%)

						Mean	Variance	95% Confidence Interval

								Lower Bounds	Upper Bounds
10	1.5	22.5°	0.1125	0.0473	1.1150	−0.04	2.35	−0.37	0.29
10	1.5	45°	0.1066	0.1071	1.1087	0.00	1.03	−0.21	0.22
10	1.5	67.5°	0.1045	1.1782	0.9431	0.02	0.29	−0.10	0.13
15	1.5	22.5°	−0.0447	1.8912	0.9238	0.12	1.39	−0.13	0.37
15	1.5	45°	0.1028	0.7914	1.0941	−0.10	1.95	−0.40	0.19
15	1.5	67.5°	0.0999	1.8638	0.9490	0.07	0.99	−0.14	0.28
Colligation	1.5	22.5°	0.0005	6.0468	1.1150	4.90	325.73	2.23	7.57
	1.5	45°	0.1038	0.1367	1.1055	0.27	2.21	0.04	0.49
	1.5	67.5°	0.1012	1.3943	0.9483	0.20	1.69	0.01	0.40

The “Colligation” in the first column means the calculations of discharge coefficients are based on the data gathered from the elbows which are under the diameters of 10 mm and 15 mm.

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