Leveling system for dry seal gasholders

摘要

In a dry seal gasholder cylindrical storage tank with a vertically- movable piston, an improved piston leveling system includes a vertically- movable weight outside the tank and connected by equal-length cables to spaced- apart support points on the piston at different distances from the weight. An array of guide sheaves on the tank define equal-length cable paths. The cables are pivotally coupled to spaced- apart points on a coupling plate to which a pair of attachment plates on the weight are also pivotally connected. Apertures in the attachment plates and the coupling plate are disposable in registry with one another for receiving a pin therethrough when the cable attachment points are in horizontal alignment, thereby to indicate equal tension in the cables.