Abstract: An air booster system (10) for use with a gas turbine to deliver compressed air to a combustion chamber (14) includes a first cylinder (24) with a first piston (52) reciprocal therein and a second cylinder (26) having a second piston (54) reciprocal therein. The first piston (52) is connected to the second piston (54) by a connecting rod (56) such that the first and second pistons (52, 54) reciprocate together. The air booster system (10) also includes a third cylinder (28) having a third piston (58) reciprocal therein and a fourth cylinder (30) having a fourth piston (60) reciprocal therein. The third piston (58) is connected to the fourth piston (60) by a connecting rod (62) such that the third piston (58) and the fourth piston (60) reciprocate together. Each of the cylinders (24, 26, 28, 30) are in fluid communication with a compressor (12) to receive preliminarily compressed air therefrom.

Abstract: Apparatus is disclosed for detecting minute leaks in wheel rims, including a bell jar cover lowered over a rim previously placed in position on a support member, engagement of surfaces on the cover and support member with the tire bead flanges of the wheel rim creating a separate hermetically sealed interior and exterior test chamber, each defined in part by the periphery of the wheel rim. These testing chambers are first evacuated, and the exterior chamber then pressurized with a gas composed at least in part of a trace gas, while the interior chamber is placed at or below atmopsheric pressure. A scavenging gas flow is initiated through the interior chamber after a brief delay, which flow is collected and directed to a trace gas sensor to detect the presence of trace gas in the interior chamber resulting from leakage through the wheel rim. In order to eliminate residual trace gas, each test chamber is evacuated and purged with air flow prior to opening of the housing and removal of the wheel rim tested.