CHAPTER 8 OTHER AUXILIARY EQUIPMENT This  chapter  provides  general  information  on  the maintenance   and   repair   of   a   variety   of   auxiliary machinery that you will be called upon to repair, replace, or  adjust.  Auxiliary  machinery  includes  controllable pitch   propellers,   low-pressure   steam   drain   systems, high-pressure  steam  drain  systems,  distilling  plants, hydraulic systems, external hydraulics, hydraulic cargo hatch   covers,   boat   davits,   bow   ramp   and   door machinery, elevators, conveyors, cranes, dumbwaiters, and  escalators.  You  as  an  EN3  must  have  already completed personnel qualification standards (PQSs) on some of this auxiliary equipment. CONTROLLABLE  PITCH PROPELLERS This section will discuss some general facts about the   maintenance   and   repair   of   controllable   pitch propellers.   For   more   information   you   can   refer   to technical    manual    system-oriented    instructions, Controllable  Pitch  Propellers,  LST  1182 through LST 1198,  NAVSEA  0944-LP-007-1018,  or  Maintenance Manual  for  Controllable  Pitch  Propellers  in  DD-963 Class,   DDG-993   Class,   and   DD-997   Class, S9245-BF-MMM-010. Keeping the hydraulic system clean is of the greatest importance.  During  a  dismantling,  there  is  always  a possibility of foreign matter entering the system. You must avoid any unnecessary dismantlings as long as the system is working satisfactorily. If the system or a part has to be dismantled, you must be sure that all parts and pipes are clean before reassembling. Wipe  up  any  oil  or  dirt  found  on  or  near  the hydraulic  valve  manifold,  the  oil  distribution  (O.D.) box,  or  the  control  plate  assembly.  Keep  bilge  water levels below the lower oil tank manhole cover. And, if possible,  keep  bilge  water  below  the  O.D.  box  shaft packing glands. Check all fittings and locking devices periodically  to  be  sure  they  have  not  vibrated  loose. Lubricate all moving parts weekly and wipe up excess oil.  Periodically  check  the  water  near  the  stem  of  the ship for oil slicks that could result in oil leakage from hub or blade seals. Very minor leaks can be detected on the  surface  of  the  water.  Follow  the  maintenance according   to   the   maintenance   requirement   cards (MRCs). Make sure the MRCs are all tailored for your equipment.  If  you  find  an  error,  you  must  submit  a feedback report. LOW-PRESSURE  STEAM  DRAIN SYSTEMS Service   steam   (low-pressure)   drainage   systems collect  the  uncontaminated  drains  from  low-pressure (below  150  psi)  steam  piping  systems  and  steam equipment outside the machinery spaces. Space heaters as well as equipment used in the laundry, the tailor shop, and  the  galley  are  typical  sources  of  drains  for  the service  steam  drainage  system.  Aboard  some  ships, these   drains   discharge   into   the   most   conveniently located freshwater drain collecting tank. On other ships, particularly large combatant ships, such as carriers, the service steam drains discharge into special service steam drain collecting tanks located in the machinery spaces. The  contents  of  the  service  steam  drain  collecting  tanks are  discharged  to  the  condensate  system.  In  addition, each   tank   has   a   gravity   drain   connection   to   the freshwater drain collecting tank and to the bilge sump tank located in the same space. Notice   that   the   service   steam   drainage   system collects  only  clean  drains  that  are  suitable  for  use  as boiler  feed.  Contaminated  service  steam  drains,  such  as those from laundry presses, are discharged overboard. Service steam drain system components consist of various pipings, steam traps, valves, and flanges. In the event you need to make repairs on this system, make sure the system is properly tagged. If needed you can request assistance from the Hull Technicians, who are well trained for this job. HIGH-PRESSURE  STEAM  DRAIN SYSTEMS High-pressure  drainage  systems  generally  include drains from superheater headers, throttle valves, main and auxiliary steam lines, steam catapults (on carriers), and other steam equipment or systems that operate at pressures of 150 psi or more. The high-pressure drains aboard  some  ships  lead  directly  into  the  deaerating  feed tank   (DFT).   Aboard   some   newer   ships,   the high-pressure  drains  empty  into  the  auxiliary  exhaust 8-l