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Subject: Twist of Tubing(повторный вопрос) pipes. Twist—For square and rectangular structural tubing, the permissible variations in twist shall be as given in Table 5.Twist shall be determined by holding one end of the tubing down on a flat surface plate, measuring the height that each corner on the bottom side of the tubing extends above the surface plate near the opposite ends of the tubing, and calculating the twist (the difference in heights of such corners),except that for heavier sections it shall be permissible to use a suitable measuring device to determine twist. Twist measurements shall not be taken within 2 in. [5 cm] of the ends of the tubing.Друзья, может кто подскажет что означает Twist в этом контексте?
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