当温差超过一定值时，由它所引起的弯曲环向应力使管道弯头焊缝爆裂。
Once the temperature difference was higher than a certain number, the bending hoop stress induced by it made the welding crack of pipeline elbow explode.
说明：即使在普通场合，也安装刚性弯头以避免过度弯曲。
介绍在电力行业设备安装、检修过程中管道等径弯头任意角度、任意弯曲半径的展开计算方法。
The paper introduces the developed calculation of the arbitrary Angle yoke of equal radius in the process of installation or repair of the pipes.
该清管器的钢轴能在较大推力作用下发生弯曲变形，有利于通过弯头或变形管段，可有效避免堵卡事故的发生。
The steel axle of this kind of pig can bend under greater thrust force, it is helpful to pass through elbow or the section of converting pipe, so it can avoid efficiently block accident.
那就是大小头后面直接接向上弯曲的弯头。
弯曲半径根据电缆截面型号选择，一根保护管最多不能超过三个弯头，垂直弯头不能超过两个。
The arch radius should be chosen according to the model of cable section; there should not be more than 3 elbows on one protecting pipe, and there should not be more than 2 vertical elbows.
弯曲半径根据电缆截面型号选择，一根保护管最多不能超过三个弯头，垂直弯头不能超过两个。
The arch radius should be chosen according to the model of cable section; there should not be more than 3 elbows on one protecting pipe, and there should not be more than 2 vertical elbows.
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