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Appendix I-Glossary-Cont. - 14104_273
Appendix I-Glossary-Cont. - 14104_275

Fireman - Navy Firefighter, Fireman training manual
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GAS FREE–A term used to describe a space that has been tested and found safe for hot work (welding and  cutting). GAS GENERATION (GG)–The high-pressure section of the main propulsion gas turbineIt includes the compressor,   combustor,   high-pressure   turbine, front frame, compressor rear frame, turbine mid frame,  transfer  gearbox,  and  the  controls  and accessories. GAUGE  (SIGHT)  GLASS–A  device  that  indicates  the liquid level in a tank. GEARED-TURBINE DRIVE–A turbine that drives a pump,  generator,  or  other  machinery  through reduction  gears. GROUNDED PLUG–A three-pronged electrical plug used to ground portable tools to the ship’s structureIt is  a  safety  device  that  must  always  be  checked before portable electrical tools are used. HALIDE   LEAK   DETECTOR–A   device   used   to locate leaks in refrigeration systems. HANDHOLE–An opening large enough for the hand and arm to enter for making slight repairs and for inspection   purposes. HARDENING–The   heating   and   rapid   cooling (quenching) of metal to induce hardness. HEADER–A  large  pipe  to  which  smaller  pipes  are connected  so  that  the  liquid  may  pass  freely  from one pipe to the other(s). HEAT  EXCHANGER–Any  device  that  allows  the transfer of heat from one fluid (liquid or gas) to another. HERTZ–A unit of frequency that equals 1 cycle per second. HYDROGEN–A   highly   explosive,   light,   invisible, nonpoisonous  gas. HYDROMETER–An instrument used to determine the specific  gravity  of  liquids. HYDROSTATIC  TEST–A  pressure  test  that  uses water to detect leaks in closed systems. IGNITION, COMPRESSION–The heat generated by compression in an internal combustion engine that ignites the fuel (as in a diesel engine). IGNITION SPARK–The electric spark that ignites the mixture of air and fuel in an internal combustion engine (as in a gasoline engine). IMPELLER–An encased, rotating element provided with vanes that draws in fluid at the center and expels it at a high velocity at the outer edge. IMPULSE TURBINE–A turbine in which the major part of the driving force is received from the impulse of  incoming  steam.  See  REACTION  TURBINE. INDIRECT  DRIVE–A  drive  mechanism  coupled  to the driven member by gears or belts. INERT–Inactive. INJECTOR–A  device  that  forces  a  fluid  into  an  area. Injectors are used in the diesel engine to deliver fuel into the cylinders and in boilers to force water into the  boilers. INSULATION–A  material  used  to  retard  heat  transfer. INTERCOOLER–An intermediate heat transfer unit between   two   successive   stages,   as   in   an   air compressor. JACKBOX–A  receptacle,  usually  secured  to  a bulkhead,  into  which  telephone  plugs  or  jacks  are inserted. JOB  ORDER––An  order  issued  by  a  repair  activity  to its  own  subdivision  to  perform  a  repair  job  in response to a work request. JP5–A fuel oil similar to DFM. JUMPER-Any  connecting  pipe,  hose,  or  wire  normally used in emergencies aboard ship to bypass damaged sections of a pipe, a hose, or a wireSee BYPASS. JURY  RIG–Any  temporary  or  makeshift  device. LABYRINTH PACKING–Rows of metallic strips or fins  that  minimize  steam  leakage  along  the  shaft  of a  turbine. LAGGING–A protective and confining cover placed over  insulating  material. LIGHT OFF–To start a tire, as in light off a boiler. LINE UP–To align a system for operation. LOGBOOK–Any chronological record of events, such as  an  engineering  watch  log. LOG,  ENGINEERING–A  legal  record  of  important events and data concerning the machinery of a ship. LOGROOM–The engineer’s office aboard ship. LUBE OIL PURIFIER-A unit that removes waste and sediment from lubricating oil by centrifugal force. AI-4






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