Research of large diameter gas flow rate measurement method

Ping Chen, Mei Chen, Miyue Zhao

Abstract

To solve the hard problem of large diameter Pitot Pipe flow meter source tracing and parameter obtaining, we propose the similarity principle, which means making one (set) model that has same geometric structure but scaling down of the actual applied flow meter (prototype for short). We calibrate the model with gas flow standard facility, determine the mathematical formula and characteristic parameters of flow calculation, then applied on prototype. Base on DN4000 pipe air flow rate measurement project, we design a differential pressure flow meter based on the principle of Pitot static tubes for prototype. Models of DN1200, DN800 and DN400 are made at the same time. In order to verify the correctness and feasibility of the solution, this project is carried on in two steps. In first step, we make the models of DN600, DN300 and DN150, then test them with gas low standard facility, figure out the relationship of parameter of different diameter. In second step, we test the models of the flow meter actually in used. Base on the two groups of test results, we can find out the parameter of the flow meter actually in used. This essay is a phase summary of step one. The result shows that the Pitot tube flow meter with same geometric structure and similarity ratio is 2, their flow coefficient difference would not be larger than 5 %.

Keywords

Flow rate measurement of large diameter pipe; Pitot tube flow meter; Similarity principle; Prototype; Model

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IMEKO-TC9-2019-053.pdf

DOI

10.21014/tc9-2022.053

IMEKO TC

TC9 - Flow Measurement

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