CHAPTER 8OTHER AUXILIARY EQUIPMENTThis chapter provides general information on themaintenance and repair of a variety of auxiliarymachinery that you will be called upon to repair, replace,or adjust. Auxiliary machinery includes controllablepitch propellers, low-pressure steam drain systems,high-pressure steam drain systems, distilling plants,hydraulic systems, external hydraulics, hydraulic cargohatch covers, boat davits, bow ramp and doormachinery, elevators, conveyors, cranes, dumbwaiters,and escalators. You as an EN3 must have alreadycompleted personnel qualification standards (PQSs) onsome of this auxiliary equipment.CONTROLLABLE PITCHPROPELLERSThis section will discuss some general facts aboutthe maintenance and repair of controllable pitchpropellers. For more information you can refer totechnical manual system-oriented instructions,Controllable Pitch Propellers, LST 1182 through LST1198, NAVSEA 0944-LP-007-1018, or MaintenanceManual for Controllable Pitch Propellers in DD-963Class, DDG-993 Class, and DD-997 Class,S9245-BF-MMM-010.Keeping the hydraulic system clean is of the greatestimportance. During a dismantling, there is always apossibility of foreign matter entering the system. Youmust avoid any unnecessary dismantlings as long as thesystem is working satisfactorily. If the system or a parthas to be dismantled, you must be sure that all parts andpipes are clean before reassembling.Wipe up any oil or dirt found on or near thehydraulic valve manifold, the oil distribution (O.D.)box, or the control plate assembly. Keep bilge waterlevels below the lower oil tank manhole cover. And, ifpossible, keep bilge water below the O.D. box shaftpacking glands. Check all fittings and locking devicesperiodically to be sure they have not vibrated loose.Lubricate all moving parts weekly and wipe up excessoil. Periodically check the water near the stem of theship for oil slicks that could result in oil leakage fromhub or blade seals. Very minor leaks can be detected onthe surface of the water. Follow the maintenanceaccording to the maintenance requirement cards(MRCs). Make sure the MRCs are all tailored for yourequipment. If you find an error, you must submit afeedback report.LOW-PRESSURE STEAM DRAINSYSTEMSService steam (low-pressure) drainage systemscollect the uncontaminated drains from low-pressure(below 150 psi) steam piping systems and steamequipment outside the machinery spaces. Space heatersas well as equipment used in the laundry, the tailor shop,and the galley are typical sources of drains for theservice steam drainage system. Aboard some ships,these drains discharge into the most convenientlylocated freshwater drain collecting tank. On other ships,particularly large combatant ships, such as carriers, theservice steam drains discharge into special service steamdrain collecting tanks located in the machinery spaces.The contents of the service steam drain collecting tanksare discharged to the condensate system. In addition,each tank has a gravity drain connection to thefreshwater drain collecting tank and to the bilge sumptank located in the same space.Notice that the service steam drainage systemcollects only clean drains that are suitable for use asboiler feed. Contaminated service steam drains, such asthose from laundry presses, are discharged overboard.Service steam drain system components consist ofvarious pipings, steam traps, valves, and flanges. In theevent you need to make repairs on this system, makesure the system is properly tagged. If needed you canrequest assistance from the Hull Technicians, who arewell trained for this job.HIGH-PRESSURE STEAM DRAINSYSTEMSHigh-pressure drainage systems generally includedrains from superheater headers, throttle valves, mainand auxiliary steam lines, steam catapults (on carriers),and other steam equipment or systems that operate atpressures of 150 psi or more. The high-pressure drainsaboard some ships lead directly into the deaerating feedtank (DFT). Aboard some newer ships, thehigh-pressure drains empty into the auxiliary exhaust8-l
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