Metal oxide etch usually happens on the thermal hydrodynamic test rig when its equipment, pipelines and valves are made of carbon steel.
在由碳钢制造的设备、管道和阀门等部件所组成的热工水力试验台架中，金属的氧化腐蚀是一个普遍存在的问题。
The brake rims on drilling rig drawworks are subjected to heat load during string lowering and will end in thermal fatigue failure.
石油钻机绞车刹车鼓在下钻过程中，由于热负荷的作用会发生热疲劳破坏。
The description covers full-hydraulic core drilling machines, portable drills, geo-thermal drills, offshore and beach sampling equipment, all-casing drilling rig, etc.
介绍的主要设备有全液压岩心钻机系列、轻便设备系列、地源热泵钻机、浅海及滩涂取样钻机、全套管钻机等。
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