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This post was last edited by youth10 on 2018-6-12 at 15:35 =================
A mass flow meter combined with a batch controller should be sufficient to meet the requirements. Additionally, using two flowmeters—one for measurement and one for verification—seems unnecessary; regular calibration is sufficient.
A mass flow meter combined with a batch controller can meet the requirements; we have used it at Nanyang Refined Wax Factory, which produces ethylene. In Puyang as well, they are used for the mixing of chemical raw materials.
Based on the data you provided, the accuracy of the instrument should be higher than 0.2 per thousand; in that case, only mass flow meters can meet such high accuracy requirements. But choose the appropriate range; there is no need to use two units.
“Using two flowmeters – one for measurement and one for verification – seems completely unnecessary to me; moreover, how can the flowmeter used for verification ensure its own accuracy? Periodic calibration still has to be done in the same way. To ensure production continuity and accuracy, a spare flow meter can be installed on the bypass during the calibration of the main pipeline flow meter. The inspection times are staggered, with the two units serving as backups for each other.
Convert the sump to an electronic scale; its accuracy can be within 0.02%, it is intuitive, and it is not affected by temperature or density.
To calibrate the accuracy of a flow meter, it is necessary to use a flow meter with higher accuracy than the one being calibrated; therefore, two flow meters are not necessary. Moreover, controlling the accuracy of the feed flow depends not only on the accuracy of the flow meters but also on factors such as the hysteresis in the control system and the layout of the pipelines. Hence, it is advisable to choose flow meters with as high an accuracy as possible if possible.
Self-control and pipeline issues have all been raised – it’s really comprehensive, learned something from this :)