The center distance of two holes is equal to the center distance of the corresponding venting hole and the water hole of the boiler.
两孔的中心距与相应锅炉通气孔、通水孔的中心距相等；
The measures to control the vapor purging time and flow rate of vapour, enlarge the oil-gas space and increase the number of air hole as well as venting area are given, which can effective...
提出采取严格控制扫线作业时间和扫线蒸汽流量，增大油气空间的体积和增加罐顶通气孔数量和面积等措施，可有效地预防该类事故的发生。
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