Measurement of cooling water in partially filled pipes

This modern power plant generates 800 million kilowatt hours of electricity. Blast furnace gas is used as primary energy. The necessary cooling water is being taken out of a river via two pipes (diameter 1.60m) and is subject to charge. Therefore, the main demand on the flowmeter is high measurement accuracy and a standardized measurement method. At this measurement sites deltawave replaced the former used magnetic inductive flowmeters.

Two DN1600 pipes feed the power plant with ca. 15000 m3 cooling water per hour. Both measurement sites are located in block 4 which generates electricity for public mains supply 8 pathes (4 paths crossed) are used with each site because of the short inlet ways (ca. 5xD). Each measurement site is equipped with 4 ultrasonic paths in two measurement levels (“crossed installation”) in order to reduce effects of transverse flow components.

Transducer arrangement for a cooling pipe

The transducers are inserted into the pipe via welding studs. Advantage: Due to a hot tap ball valve system transducers can be removed during normal operation conditions. A great plus for your process reliability and operational costs. The flow-measurement is completed by a dp-based level measurement in order to monitor the case of a partially filled pipe.

This arrangement is according to the recommendations of the IEC41 and the ASME PTC 18. A measurement accuracy of 0.5% of reading can be guaranteed by this arrangement in case of a filled pipe. The ISO6416 is valid for the flow calculation in case of partially filled pipe. An accuracy up to 1% of reading is possible depending on the number of surcharged paths.

Flume type: 2xDN1600 (filled / partially filled)
Medium: Cooling water (river water)
Number of paths: 2×4 (crossed installation) for each site
Transducer type: 1 MHz
Transducer mounting: Quick-lock (ball-valve) for uninterruptible installation
Level-metering: Differential pressure transmitter
Typical flow: 15000 m3/h

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