© 2019 Department of Petroleum Resources. All rights reserved Department of Petroleum Resources (DPR) PROCEDURE GUIDE

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1.6.3   Operation and Maintenance 
1.6.3.1 Turbine meters shall be operated and maintained in accordance with the guidelines 
of the manufacturer and those stipulated in the appropriate reference standards.  
1.6.3.2 The meter linearity is to be proved at a minimum of six points over the manufacturer’s 
specified range to include the minimum flow rate, the maximum flowrate and four 
equally spaced points between the minimum and the maximum flow rate. 
1.7 Coriolis Meters 
1.7.1 Description 
1.7.1.1 Coriolis meters measure mass ﬂow rate and density. A Coriolis meter consists of a 
sensor and a transmitter. A typical Coriolis sensor has one or two tubes through which 
the ﬂuid ﬂows.  
1.7.1.2 A Coriolis meter may also be conﬁgured to indicate volumetric ﬂow rate. The 
volumetric ﬂow rate may be determined by dividing the mass ﬂow rate by the 
measured density at ﬂowing conditions. 
1.7.2 Design and Selection 
1.7.2.1 Coriolis meters for custody transfer meter purposes shall satisfy that its application, 
proving facilities can reliably and consistently meet the accuracy criteria of all parties 
engaged in the transaction and shall generally be carried out in accordance with API 
MPMS Chapter 5.6 and other relevant standards. 
1.7.3 Operation and Maintenance 
1.7.3.1 Coriolis meters shall be operated and maintained in accordance with the guidelines 
of the manufacturer and those stipulated in the appropriate reference standards. 
1.7.3.2 Changes in ﬂuid temperature as well as pressure shall be monitored and shall be 
compensated to minimize its influence on the accuracy the meter. 
 
1.8 Multipath Ultrasonic Flow meters 
1.8.1 Description 
Ultrasonic meters are inferential meters that derive the liquid flow rate by measuring the 
transit times of high- frequency sound pulses. They also measure flow rate using ultrasound, 
which can either be by “Doppler Method” or “Transit time differential method.  
1.8.2 Design and Selection 
1.8.2.1 Consideration shall be given to the following items in designing and selecting  
Ultrasonic flow meters:  
1.8.2.2 The class, type of piping connections, materials and the dimensions of the equipment 
to be used; minimum and maximum operating flow rates; space required for the 
installation of the metering and proving system; acceptable pressure drop across the 
meter and minimum and maximum ambient and process temperatures shall 
generally be in accordance with API MPMS Chapter 5.8 and other relevant standards.  
1.8.3 Operation 
1.8.3.1 After an Ultrasonic flow meter is calibrated to determine one or more calibration 
coefficients, these coefficients shall be entered to the Ultrasonic flow meter Signal 
Processing Unit (SPU) in the presence of representative of the Department of