For on-line calibration system of flowmeter, the working fluid flow is from the petroleum pipe line itself.
体积管工作时的液流，对于流量计在线检定系统，是来自输油管线本身。
The oil metering and regular calibration of flowmeter are important work for petroleum transportation and petrochemical enterprises.
原油外输计量与流量计检定工作是石油、石化企业的一项重要工作。
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