Abstract
Equations are developed for designing hydraulic rams of maximum thrust for a given external cylinder diameter. For push type rams, the optimum ratio of outside to inside wall diameter w is 1.554, and the maximum fluid pressure P to be used is 0.4142 times the allowable hoop stress ft in the cylinder. For pull type rams in which the allowable tensile stress fb in the pull bar (cylinder rod) and the allowable hoop stress ft in the cylinder wall are equal, w=1.414 and P=0.333 ft. When these allowable stresses are not equal, more complicated relationships exist and are discussed in the text.
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