According to the results of calculation and analysis, Colebrook formula is considered as a accurate formula, and approximate formulae only can be made rough calculation and mathematical analysis.
计算和分析结果表明：科尔布鲁克公式是紊流混摩区的较准确的计算公式，近似公式只适用于粗略的计算和数学分析。
This paper introduces one test method of VOC in refinery units with the practice of petrochemical industry. And, rough calculation on quantity of VOC leak in unit is made according to EPA method.
结合石油化工行业生产的实际，介绍一种炼化装置挥发性有机物检测方法，并依据EPA的计算方法对装置的挥发性有机物的泄漏量进行了估算。
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