Document kDaoRE1bGQJzYY8o8yN6NK6yE

SAVE CRITICAL PARTS continued . Condenser Tubes and Tube Sheet Are Rescued From an Untimely and Needless Death Thirteen yean of tough aervice have eroded Injection end* of these tube* to leu than 0.010-in. wait thickness In some places. Leakage la condenser was ex cessive. In 42 hours, ends of 17,800 lubes were coated with a special neo prene. That reestablished original tabwoll thickness to six inches back from tube ends where they were eroded. Tube sheet got 1/16-in. coating also. At same time, tube-sheet gasket, be* tween tube sheet and waterbox, was sealed. Coated job has been in terries < and there is absolutely no leakage now.. So coating has solved two very expen sive problems. This condenser will gist' many years of life with same old tuba, and tube sheets, saving costly outsit. So Is. This Old Warn-0ut Centrifugal Pump, Saving Owner a Fat $29,000 Bill Ibis large circulating pump is badly eroded from Jong use. Cut of tongue hit receded 7 in. As shown in left photo, it was first repaired with copper plats, held with countersunk screws. Sealing ring seats were also badly eroded, so new ones were installed. Photo shows them covered with tape to save being covered with neoprene. With stage set for coating, 0.090 in. of Nq. 1460 neoprene covers eroded and built-up parts. Decause of unusually lough service, neoprene in this pump is reinforced with glass cloth. Total cost of salvage job was only 11000. New pump would cost $30,000. Chances are coating will hold up many years, doing work of another new pump. Other Repairs for Power-Services Equipment prrnpr Cavitation eroded this 24-ln. row-coollng-water ACTTQ Some Impeller rubberised with 0.035 In. film oft*', DLl UAL pump impeller after only 9 months'normal service NT I 111 covltoted areos wore filled to reestablish contours' COOtlNO-TOWEB (on bind, w.lgh, 200 TRAVEUNO SCREEN ond frame being Inspected by Bill Sesher after cootlng with now; 18-ft dlom; balance must b Pttfoct prene. Bore steel losted one year, expected life of this coated Job is 10 yeors Pump Impeller Saved from Early Grave Tills 24-in. impeller of raw-watercooling supply pump is badly cavitated after only nine months* service. All vanes are eroded in same way. After sandblasting and priming, depressions were filled and leveled off to re-estab lish contour of each vane. Doing this job right makes difference between fail ure or success of coating job. Then impeller was cooled with 0.036in. film of neoprene and cured in drying room. Repaired pump has been running since June 1949, and there is no India*' lion of cavitotion. Film thickness Is so well-controlW. that impeller is balanced the some **, before. Each layer is s different shad*' in moke sure of covering entire art**. 104 PUNT OPERATION AND MAINTENANCE SECTION row**. lANUARy |f53 PLANT OPERATION AND MAINTENANCE SECTION 109 ia 2