Document a49JxbZ1QRxZa2OOZL9NzVb5X

U PHANTOM VIEW of 5000-kw turblne-generoter peckoga unit. tern components and machine controls in one unit. Rust prawnControl simplified by locating steam condenser, lubrlcotlng-sys- fives must be completely removed before odding first oil thorps preventive coatings applied by the manufacturer, end any dirt that may have found ita way Into the system, are. completely removed before the regular lubricating oil -is added. 1/ not, these contaminants will reduce the normal life of the oi] and may affect turbine operation. A new turbine lube system Is properly prepared when turbine builder, operator and oil supplier pool their efforts. Genera) lAipwtlM. After ihe turbine is in place and before any part of the cleaning job is started, the entire lub rication system should be thoroughly inspected. Carefully check for any peculiarities, such as nir (rockets or areas of poor drainage, which may cause trouble when the turbine is put in service. This initial inspection will also tell the extent of the cleaning job required before oil or flushing fluid is introduced into the system. In addition to removing the thick rust-preventive film, wire brushing, blasting and sweeping are olten necessary for removal of welding shot, chips, sand, etc. Throughout the cleaning process and in later steps of the work, use lintless wiping cloths. Lint accumulation from cleaning cloths has been known to couse plugged oilways after the unit is in operation. flushing the System. After the pre liminary cleaning ihe next step is lo send a charge of flushing oil through the lube system. Make provisions to prevent any of the flushing oil from entering bearings. This can be done best by installing closed flengea at . bearing-oil inlets ond connecting a by pass across each bearing. On small in stallations, or wherever this procedure cannot be justified, the bearing sheila should be removed or rotated to pre vent flow of oil through them. In rotat ing the bearing be careful thot the flow o! high-pressure flushing oil is not blocked. It may be beat to aeetionalize piping and flush each section separately, de pending on size and layout of the sys tem end capacity of the pump used to circulate the flushing oil. One of the reasons for flushing a system is to remove any rust preventive materials thot may bo present, ff the manufacturer's rust preventive is not readily soluble in turbine oil, it should be removed before assembly. Choice of a solvent depends on the type of rad preventive. When it is oil soluble ai can be flushed away, use t flotbb4 oil with the.same or lower riicoshj than the recommended lubricating For the latter method, It is be** select a flushing oil with the same type of rust Inhibitor as the final oil Use sufficient flushing oil so theta be continuous circulation with auxiliary oil pump. Hearing fho Oil. The cirU|JJ flushing oil should be heated to IttO F. Heating the oil above the mum temperature lo be expected ^ the unit is put in service is because it expands the pipht* greater degree than Is met with , ice. This effectively loosens other adhering material. For the flushing oil any of the Ml means may be used, with due lion to prevent localized overbesw ^ oil: (I) Pipe aleam at a P1***^, 3-5 psi lo the water side of lubricating-oi) cooler. (2) .-g*. porory healing cofl fn the ^ oil sump tank. (3) Install W heater in the piping syite. ^ It is important that o filter 86 (692) ,OWI N--"b", ..\m,t : ..j grtAM GOVERNOR SHOWING: l, 2: oil pumps; 3: pressuro ipoutormer; 4: reloy phton pitot; 3, 6: servomotor rotoy & pis.tat; 7: speed changer; 6, 9: lever ond spring; 10: shofr I INSTALL CLOSED FLANGES ot bearing oil Inlets to prevent the entrance of flushing oil. With bearings thus blocked, con nect o temporary Jumper or bypass to ollow tube-oil circulation fate be used continuously during the flashing operation. Where the system is aol equipped with a purifier, install an auxiliary filter to remove suspended ccatsminanta which would otherwise be carried through the syeiem. ' Circulation of hoi flushing oil should be continued for a period vary ing from four hours for smaller units la 96 hours or longer for larger tur bines. Following this flashing opera- flea drain all oi! from the system, tak ing particular care to drain all low prints in the piping, coolers and gov ernor mechanism. Remove any heovy solids that have been flushed into Ihe ril reservoir. Inspect and dean the jMriag pedestals and tha governor Mnulfc mechanism. . On small systems and those where *ru,preventive materials have been ^ idiial flushing charge may be aie type off that wifi be used later m the lubricant. The procedure ia sira- ""f * ^ slready described. - e|Thri"m*nt Oil Chorge. To com- y remove all flushing oil and any . "hie'tts it may hate carried into a_t. .on' *l m7 be desirable lo follow 00. charge of displacement `is decision should be left to the tafkJU*niem * ,^lc pplier flRd hdaf ei,^ncer* Factors to consider ril M! **** *n<* riscoaity oi flushing n.leaer,l cfeanlineae of the ays^ ^Placement oil should be tho Wat -?pe ** *he recommended lubri- 'tiieili,1! . ^ heated to 130-150 F and Since"t/0r ,w0 'w"'*- rizcoeity of the oil is often higher than the flushing oil, some con taminants that were not removed by the less viscous oil will be suspended and flushed out. Inspection of the centrifuge or filter at this time tells if the system is dean. If so, the blind flanges and jumpers that were initially installed may be removed and circula tion continued through the bearings for an hour or two. During this circulat ing period, the governor mechanism. should be operated to flush it com pletely. After this recirculation period, if practicable remove and Inspect oil ac cessible bearings; if they are in sarisfactory condition, the system may be considered dean. During drainage, atlention should ones again he giveo to all low points in the system. Wipe out the oil reservoir with linriess cloths and remove any loose solids. Care at this point may save you lime and trouble after the turbine fa in service. Experience hat shown it is entirely satisfactory to operate o turbine for a period up to a few weeks on the dis placement charge on systems where particular care has been taken dur ing fabrication and erection- This pro cedure may be followed when labora tory tests indicate the displacement charge is in satisfactory condition with particular regard to viscosity and clean linessWhere operating requirements per mit this schedule, the difficulties fre quently encountered in operation of s new system can be worked out before the final lubricating oil is introduced. CORRECTION NOTICE In the article, "Internal Conditions of Old Boilers Culde Water Treatment For New Units," Powcx, September 1948, pp 88-91, the following changes should be made: On p 89, col 3, per 2, the last two sentences should read: "Aluminum silicate wot alio found In (be snalclte scale farmed In Sept 1944. This indi cated that (be feedwater mutt have contained considerable suspended mat ter, as otuminum silicate in relatively mall amounts would not normally remain es sttcb very long In bigh-temperature, olkalina boiler water." On p 90, col 2, second sentence ef first complete paragraph originally printed read: "But should silica re moval prove necessary, this lysietn of softening would provide therelor." This statement It in error and should be: "But should silica removal prove necessary, (bis system of eo/ten/ng would noi provide iherefor,** November (peg 1693) 87