计算该段风管实际平均运转静压，选择泄漏等级（LEAKAGE CLASS）CL，由于本案均为矩形风管且依约规定填缝等级（SEAL CLASS）为A CLASS，故泄漏等级（LEAKAGE CLASS）CL＝6。
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On-off valve shall be pneumatic ball valve, and the leakage class is V or VI. All the valve accessories such as limit switches, solenoid valves and filter regulators shall be supplied with the valves.
切断阀采用气动球阀，泄漏等级为V或VI级，限位开关、电磁阀、空气过滤减压阀等应随阀成套供货。
One of the reasons why this is usually the case is to do with class leakage across module boundaries.
之所以这样，原因之一是跨越模块边界的类泄漏。
The means of sealing by nitrogen aerating and local forced ventilation are used for the leakage source points so as to reduce the explosion class in the gas zones.
通过对煤气加压站煤气泄漏源点的分析和确认，并对其泄漏源点采取充氮密封和局部强制通风等手段，以达到降低煤气区域爆炸等级的目的，并对煤气加压站防爆等级进行了探讨性划分。
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