CG 47 class advisory nr 06-93a1草原和掩体冷风机临时冲洗程序ref / a / rmg / aegis prog mgr / 051143zmay93 // ref / b / rmg / uss princeton / 091855zjun93 // narr / ref a是CG 47 class advisory 06-93。参考资料b是淡水系统在冲洗草原空气冷却器时受到污染的报告。/ / RMKS / 1。本等级建议修正案澄清了参考b所报告的草原式和遮罩式空气冷却器的临时淡水冲洗程序。蝶阀泄漏是CG 47级船舶上的一个已知问题。因此，对蝶阀泄漏严重的船舶也提供了具体的指导。2.参考资料b所报告的污染是由于将软管从大草原空气冷却器海水进口阀后部的深水槽连接到量规管上的硬管道造成的。蝶式隔离阀的过度泄漏导致海水被迫进入热水管道上的淡水。参考第3段a .(1)的目的是在没有硬管道附件的情况下，通过排气塞孔填充冷却器。3.以下指南对参考a第3.a .(1)段中没有安装加装进水/排水阀的冷却器的船舶的冲洗程序进行了澄清:a .使用软管通过排气塞孔向冷却器注入淡水，直到有水出现在排气口。 B. DO NOT HARD PIPE THE FRESH WATER HOSE TO THE COOLER. SALT WATER CONTAMINATION OF THE POTABLE WATER SYSTEM MAY RESULT. ENSURE AN AIR GAP EXISTS BETWEEN COOLER VENT PLUG HOLE AND FRESH WATER HOSE TO PREVENT POTABLE WATER SYSTEM CONTAMINATION. C. BUTTERFLY VALVE LEAKBY IS POSSIBLE. IF COOLER ISOLATION VALVE LEAKBY IS GREAT ENOUGH TO PREVENT DRAINING OF THE COOLER, REINSTALL VENT/DRAIN PLUGS AND PERFORM SALT WATER LAY-UP IAW REF A PARA 3.A.(2). FRESH WATER LAY-UP IS THE PREFERRED METHOD EVEN IF THERE IS MINOR VALVE LEAKBY. ALTHOUGH NOT AS EFFECTIVE AS A FRESH WATER LAY-UP, THE SALT WATER LAY-UP WILL REDUCE THE AMOUNT OF CORROSION DAMAGE OCCURRING TO THE COOLER. 4. ECP 47-4811 IS BEING DEVELOPED WHICH WILL INSTALL ADDITIONAL ISOLATION (BALL OR GLOBE) VALVES, VENTS, DRAINS AND FILL CONNECTIONS TO 33 SEAWATER COOLERS, INCLUDING THE PRAIRIE AND MASKER COOLERS. THIS WILL ALLOW SHIPS TO EFFECTIVELY ISOLATE THE COOLERS FOR PREVENTIVE AND CORRECTIVE MAINTENANCE. THE ECP WAS APPROVED AT THE JUN 93 TECHNICAL SCOPE REVIEW AND WILL BE SCHEDULED FOR THE OCT 93 CONFIGURATION CONTROL BOARD. CG 70-73 ARE TENTATIVELY SCHEDULED TO RECEIVE THE ECP DURING PSA. BACKFIT OF THESE MODS TO THE PRAIRIE AND MASKER COOLERS ON CG 47-69 WILL BE INCLUDED IN SHIPALT 47-435K WHICH IS CURRENTLY UNDER DEVELOPMENT BY ACPY. TENTATIVE SCHEDULE IS TO START INSTALLATION OF SHIPALT 47-435K IN FY 96. 5. ORIG POC IS MR. N. SMITHSON, PMS400F511, DSN 332-5959 OR COMM (703) 602-5959.//
CG-47