Document 3qYzokrnYzYKRrQ80RL2n4xy

4 These three views show details of a 1500-hp pipeline compressor station with one unit. A single tree-piston power-goi generator supplies the driving turbine spinning at 14,400 rpm. Con crete met supports all equipment. Col umn footings rolse main machinery so that operoting floor has a* 4-ft space underneoth to accommodate oil connect ing piping. This Coper-Bestemer design and one In Fig. 1 take In air through air silencer itondlng outdoors. Turbine exhausts through the neighboring slock. All auxiliaries have toporate power drives, simplifying starting procedure I iimi llli jiunmn mill DKlv i|ine: U.S. Development in High Gear Sect'll B O ________ 3 Cross sections through 8LH Modol B show onongement ol the air Inlet to diesot ' 'j cylinder, left, and fuel nonles with' synchronising rocks or and 0.0,, o. ,/oh, velopments in our coujffl Dec 1952, pp 104-105; Jen !&:;?? 7^ei; Dee 1942, pp m, 889. generators feeding a single Turbine hold out the promise ol >Sjn* high thermal efficiency of the with simplicity ol turbine-shaft output. The papers report three designs of free-ptston units. Sigma gas generators based on the Pescara patents were built in Trance and have been applied to electric gen eration, locomotive drivo end ship pro pulsion. These models use relatively low-pressure low-tcmpcrature gas (50 psig, 945 F) discharge from the freepiston unit to run the turbine. They ore built (or construction economy and low maintenance cost. Air compresses on the inward stroke, and no cylinder cool ing is used. CoopewBetsemer generator works with outward compression, Fig. S, and cylinder cooling. To gain competitive advantage it generates 72.5-psig 1000-F gas for the turbine. Fig. 5. It is pri marily a heavy-duty unit fnr driving notnral-gns pipeline centrifugal com- pressora, electric generators and ma rine vessels where weight and space are not major considerations. Baldwin * lima-Hamilton generators also use outward compression and cylin der cooling, Fig. 2 and 3. Designed for lightweight applications they discharge 90-psig 1300-F gaa to iho turbine. Aa a result, the diesel cylinder runs at higher operating conditions than those of usual reciprocating engines. This gives k a higher specific power than the genera tors mentioned before. The BLH unite are being specifically developed for Naval combat vessels where weight and space are primary considerations.' Test date on the Sigma gas generator figured at B5% turbine efficiency showed it would develop 1255 shaft hp at a maximum thermal efficiency of 32.4%. Mere on next page INOINfHINO AND MANAOIMINT SECIION Kwl ENGINEEftlNO AND MANAGEMENT SECTION