Abstract: A suspension system for a vehicle such as a trailer permitting the vehicle to be raised or lowered and providing a cushioned ride when the vehicle is in motion. The suspension system comprises a vehicle having a frame, a pivoting arm having a shoulder, a wheel end, and an elbow forming a bend between the shoulder and the wheel end, the pivoting arm pivotally attached to a suspension means at the shoulder, to the frame at the elbow, and to a wheel at the wheel end, the suspension means also pivotally attached to the frame in such fashion as to be in-line with the wheel and movable between an extended position and a retracted position such that when the suspension means is in an extended position, the frame is raised, and when the suspension means is in a retracted position, the frame is lowered. The suspension means may be an air suspension means, such as a double-acting pneumatic cylinder or an air bag.

Abstract: Apparatus for locating leaks in a heat exchanger of a type having a plurality of tubular elements supported at one end by a fixed tube sheet and at the other end by a floating tube sheet, contained within an elongated cylindrical housing with the housing having flanges for attachment thereto by end vessels. The apparatus includes an elastomeric sleeve couplable, after removal of the end vessels, to a flange of the housing adjacent the floating tube sheet, with provision being made for affixing the sleeve in sealed contact with the flange and also for sealing the elastomeric sleeve to the floating tube sheet. With the apparatus in place the chamber surrounding the tubular elements and between the tube sheets is pressurized with fluid and the ends of each tube and tube sheet inspected at the same time for fluid leaks.