ESTABLISHMENT OF A NEW HYDROCARBON FLOW STANDARD FACILITY AT NIM

Lixu, Su Yanxun, Cui Lishui, Hu Heming, Wangjie

Abstract

A new oil flow standard device is built with dual-standard by National Institute of Metrology(NIM). The two types of standards are installed in the device, namely, new-type auto-load electronic scale and standard volumetric tube. Working medium: transformer oil, with a kinematic viscosity of 21 mm²/s; flow range: (1.2 ~ 120) m³/h; the extended uncertainty of the oil flow meter with double standards: <i>U</i>_rel &#8804; 0.05% (<i>k</i> = 2); the extended uncertainty for mass method: <i>U</i>_rel = 0.04%; the extended uncertainty for volumetric tube <i>U</i>_rel = 0.03%. The repeatability is less than 0.02%. The large-caliber standard comparison group uses turbine flowmeter as the master meter and ultrasonic flowmeter as the auxiliary monitoring meter; in the small-caliber group, only Coriolis mass flowmeter is exclusively used as comparison standard. According to the test results of two types of flowmeter, the measurement uncertainty and repeatability are less than 0.05% and 0.02%, respectively. In order to raise the uncertainty of mass method, researchers specially design auto-load calibration system for electronic scale and a new-type rotary Diverter.

Keywords

oil flow meter, double-standard meter, comparison standard group, uncertainty, Diverter, auto-load calibration system

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IMEKO-TC9-2013-056.pdf

DOI

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IMEKO TC

TC9 - Flow Measurement

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