Large capacity cylinders installed in the frames of tube trailers subject to torques caused by their own curvatures and out of roundness under the action of gravity. The torques may induce additional stresses to the ends of the cylinders connecting to the frames. If the torques are big enough, the cylinders may rotate significantly, which can deform or even break the gathering and transferring pipes connecting to the cylinders. An explicit calculation method was presented to predict the maximum torques introduced by the degrees of curvatures and out of roundness of the cylinders under gravity, and the torques calculated agree with the tested results of 5 steel cylinders with a water capacity of 2250 L, which verifies the usability of the calculation method.

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