In order to compare three concentration measurement methods, namely sampling method, gamma-ray method and ERT (Electrical Resistance Tomography) method, a pipeline test platform with inner diameter of 150mm was built to simulate the slurry transport under non-sedimentary flow regime and sedimentary flow regime. A truncation concentration was defined to enable the ERT concentration meter installed in the horizontal pipe to measure the transport concentration under sedimentary flow regime. For the test sand, the truncation concentration value was tested as 49%. The installation angle is recommended to be between 15° and 30° for the gama-ray concentration meter installed in the horizontal pipe, and 120 ° for the sampling tube installed in the horizontal pipe.


Concentration is a key parameter to be monitored in pipeline slurry transportation, comprehensive and accurate measurement of concentration information is the basis of automation control of pipeline operation and improvement of production efficiency. The classical sampling method is simply the removal of a small sample from the system, which has been used as a means of measuring suspension uniformity or local solids concentration because of its simplicity (MacTaggart et al., 1993, . et al., 1996). The gama-ray concentration meter is a gama-ray based measurement, which is widely used in dredging ships because its measurement accuracy is recognized (Liu and Zhang, 2020, Cui et al., 2021). The tomographic application of gama-ray concentration meter is demonstrated on a measured concentration map and a suitable image reconstruction method is tested by Krupička and Matoušek (2014), but the disadvantage is that much longer measuring time is required to produce a map. ERT technology is one of the family of non-intrusive sensors, which has attracted the interest of many researchers because of its many advantages, such as non-intrusive, relatively low cost, no environmental restrictions, fast etc. Within the last three decades, the ERT has seen a significant development and has been applied to many industrial process involving two/multi-phase systems. Particularly the application of the ERT to solid-liquid flow has been reported by many investigators (Wood and Jones, 2003, Pachowko et al., 2004, Giguère et al., 2008, Razzak, 2009, Faraj and Wang, 2012, Faraj et al., 2015, Liu et al., 2018, Tarabi et al., 2021, Cheng et al., 2021). In view of these three concentration measurement methods, how to correctly use these measurement methods to obtain more reliable concentration information is a problem that needs to be studied (Liu and Zhang, 2020, Cui et al., 2021). In order to make in-depth comparative study, the basic principles of the three measuring methods were expounded. Three measuring devices were installed on the 150mm pipe conveying test platform, the concentration information obtained by different devices was compared and analyzed, Furthermore, some suggestions on how to use these devices are given.

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