Application

• Steel pipeline DN 500
• Fully filled
• Groundwater without any pollution
• Measurement system permanently immersed due to short calming section

Definition of tasks

• Detection of drained volumes in the low-lying protective dyke area of a large German river
• High measurement accuracy despite short calming section
• Immersed pumps and permanently overflown calming section require IP 68 for the sensors used
• Maintenance-free measurement system required due to inaccessible measurement point

Solution

• Due to the lack of reflecting particles in the medium, the ultrasonic transit time measurement Type NivuFlow 600 was used.
• To achieve high accuracy and to compensate the swirl downstream of the pumps, a crosswise 2-path measurement with 4 sensors was installed.
• To avoid maintenance measures the velocity sensors were installed directly inside of the pressurised line using welded nozzles and clamping elements.