Part of the gas pipeline network cable theft is serious, gas loss rate, gas difficult to protect users, unauthorized users regional leakage serious, serious security risks.

部分管网管线偷盗气现象严重，供气损耗率高，保障用户用气困难，非法用户区域漏气严重，存在严重安全隐患；

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This article introduces the general concepts of gaseous fuel engine gas loss rate and heat loss rate, and puts forward some problems to be paid attention to in volume measurement.

介绍气体发动机气耗率和热耗率的基本概念，提出了体积法测量中应注意的问题。

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But gas flow rate is too big, but will make arc beam are short and heat loss increased ability to cut down to make cutting process, cannot proceed.

但气体流量过大，反而会使弧柱变短，损失热量增加，使切割能力减弱，直至使切割过程不能正常进行。

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