TM 10-6640-215-13 1-13. FUNCTIONAL DESCRIPTION OF PETROLEUM LABORATORY SUPPORT SYSTEMS - continued. d. Air  System  (Refer  to  Figure  1-6).    The  air  system  consists  of  the  air  compressor,  air  tank,  pressure  switch, moisture trap, and associated piping and valves.  The air compressor is located in the mechanical room and operates on 208V, 60Hz, 3-phase power supplied from A15CB6 located in POWER PANEL NO. 2.  It can supply air at 120 psi to the system.  In automatic operation, the compressor is controlled by a pressure switch which shuts it off when the pressure has reached 120 psi and turns it back on when the pressure in the system drops to 60 psi.  The air tank relief  valve  is  set  to  operate  at  150  psi.    Air  piping  is  color  coded  green  and  valves  are  color  coded  orange.    Air supply valves are located next to the distillation unit, behind the viscosity baths, above the centrifuge, in the fume hood, at the manometer, the bomb manifold, and the gage test fitting. e. Vacuum  System  (Refer  to  Figure  1-6).    The  vacuum  system  consists  of  the  vacuum  pump  and  associated piping and valves.  The vacuum pump is located in the mechanical room and operates on 110V, 60Hz, single-phase power supplied from A15CB9 located in POWER PANEL NO. 2.  It has a free air capacity of 58 liters per minute and supplies  vacuum  where  required.  Vacuum  piping  and  valves  are  color  coded  yellow.    Vacuum  supply  valves  are located behind the viscosity baths, above the centrifuge, and in the fume hood. f. Water  System  (Refer  to  Figure  1-6).    The  water  system  consists  of  the  water  pump,  pressure  switch,  water tank, water surge tank, filter, water cooler, water heater and associated piping and valves.  The water pump operates on 110V, 60 Hz, single-phase power supplied by A15CB8 located in POWER PANEL NO. 2.  It is controlled by the pressure switch.  It turns on when a water outlet is opened and off when the outlets are all closed.  The water surge tank removes oscillations from the system while the water tank acts as the system supply source. The water cooler operates  on  110V,  60  Hz,  single-phase  power  supplied  by  A15CB7  located  in  POWER  PANEL  NO.  2.    The  water heater operates on 110V, 60 Hz, single-phase power supplied by A1CB17 located in panel board 1.  The system may be  supplied  with  water  from  an  outside  pressurized  source,  from  an  outside  unpressurized  source,  by  using  the system pump, or by its own water tank.  Water supply piping and valves are color coded blue.  Water return piping and valves are color coded white.  Drain piping is colored black.  Water supply valves are located at the distillation unit, the RVP Bath, the JFTOT, the sink (both hot and cold), the freezer, the laboratory ovens, the viscosity baths, and the fume hood.  Water return valves are located at the freezer, the laboratory ovens, the viscosity baths, and the fume hood. g. Water  Still.    The  water  still  is  electrically  operated  and  supplies  pure  water  for  use  in  the  laboratory.    It  is located on the curbside wall and operates on 1lOV, 60Hz, single-phase power supplied from a convenience outlet. h. Drain System.  The drain system consists of valving and piping required to route condensate and waste water from the sink and equipment to one of two deck drains located in the Petroleum Laboratory.  The sink and most of the equipment in the laboratory compartment drain through the trailer floor to a quick-disconnect coupling and hose. The equipment located in the mechanical room drains to the forward deck drain.  The system is provided with a drain tank mounted under the sink which contains a submersible pump.  Waste water from the electric still, RVP bath, and return water (when the system is receiving water from an outside source), drains into the tank where it is pumped to the forward deck drain. 1-26