Validation of transient time method to calibrate oil flow meters in closed conduits using ¹²³I as the radiotracer

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Mean flow velocity (in cm/s) for injections T1, T2, and T3, and RV = 1000 L/h (Reynolds number = 10 107)

Injection	D1D2	D1D3	D1D4	D2D3	D2D4	D3D4	VM
T1	97.26	96.95	98.89	97.14	97.78	97.08	97.52
T2	96.86	98.22	97.13	96.99	98.08	97.68	97.49
T3	98.46	97.21	98.09	97.39	97.01	97.95	97.69
			Mean velocity		97.57 ± 0.31 cm/s
			Oil flow rate		1001.14 ± 8.16 L/h

Relationship between flow measurement data

RV ± 0.25% (L/h)	Q (L/h)	rv%	Percent error
800	797.72 ± 6.57	0.824	0.28
950	944.84 ± 7.56	0.800	0.54
1000	1001.14 ± 8.16	0.815	0.11

Mean flow velocity (in cm/s) for injections T1, T2, and T3, and RV = 950 L/h (Reynolds number = 9600)

Injection	D1D2	D1D3	D1D4	D2D3	D2D4	D3D4	VM
T1	93.16	90.07	92.24	91.85	93.87	91.12	92.04
T2	93.11	91.02	91.02	91.12	92.23	92.85	92.01
T3	93.07	90.47	91.92	93.09	93.89	90.86	92.50
			Mean velocity		92.18 ± 0.26 cm/s
			Oil flow rate		944.84 ± 7.56 L/h

Pipeline scan in the measurement positions using a 241Am gamma source

	Total gamma-ray counts
	Position D1	Position D2	Position D3	Position D4
Vertical	8188 ± 90	8194 ± 90	8209 ± 91	8175 ± 90
Horizontal	8002 ± 89	8000 ± 89	8001 ± 90	7990 ± 89

The yield of 123I oil labelling process

Sample	WLS-1A	WLS-1B	OLS-2	WLS-3A	WLS-3B	OLS-3A	OLS-3B
Yield (%)	7.81	5.12	88.74	0.44	0.38	85.46	84.92

Mean flow velocity (in cm/s) for injections T1, T2, and T3, and RV = 800 L/h (Reynolds number = 8085)

Injection	D1D2	D1D3	D1D4	D2D3	D2D4	D3D4	VM
T1	76.95	78.36	77.53	77.59	76.87	77.87	77.53
T2	76.89	77.99	78.09	77.87	78.22	77.96	77.84
T3	76.83	78.39	77.60	77.99	78.14	78.19	77.86
			Mean velocity		77.74 ± 0.27 cm/s
			Oil flow rate		797.72 ± 6.57 L/h