Steam Injector Maintenance

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valves  and  the  boilers.  If  repairs  are  needed,  see  that they are made promptly. In making a quarterly check on the blowoff valves, do not overlook the insulation, bearing in mind that it should be kept dry. Another item is the discharge piping leaking from the valves. Make sure the discharge piping is not mounted so rigidly that proper expansion and contraction are affected. Keep SAFETY VALVES (fig. 2-4) in top working order. At regular intervals, depending upon operating conditions, the safety valves must be lifted manually. At least once each year the valves should be tested by raising   steam   pressure   to   popping   pressure   of   the respective valve. If safety valves function improperly, promptly   report   the   matter   to   your   immediate supervisor.  For  detailed  information  on  the maintenance  of  safety  valves,  refer  to  manufacturer’s manual. STEAM  INJECTOR  MAINTENANCE With  injectors,  little  maintenance  is  required.  At times  you  will  have  to  reseat  the  overflow  and  ring valve. Lime deposits also can reduce the operation by closing  down  the  size  of  the  combining  and  delivery tubes. A good way to remove lime deposits is to place the injector in a tube of muriatic acid for several hours. To clean the injector, remove the bottom plug (fig. 2-5).   The   delivery   tube   and   ring   valve   drop   out. Examine  and  clean  all  passages  and  holes.  After cleaning,  replace  them  in  the  plug  (which  acts  as  a guide) and screw tightly in place. STEAM  TRAP  MAINTENANCE Once  each  month,  see  that  steam  traps  are  tested for  correct  operation.  Methods  used  in  testing  steam traps  (such  as  the  test  valve  method,  the  glove  test method,  etc.)  are  discussed  in  another  section  of  this training manual. Once a year, or more often if required, dismantle and clean all traps. Inspect for the following: 1. The accumulation of foreign matter 2. Plugging of orifices, valves, and vents 3.   Cracked,   corroded,   broken,   loose,   worn,   or defective parts 4.  The  excessive  wear,  grooving,  and  wire drawing of valves and seats 5. Defective bellows, buckets, or floats 6. Leaky vessels and pipes 7. Defective bypass valves Repair  or  replace  defective  parts  as  required following   yearly   inspection.   Replace   or   repair   all Figure 2-4.—A typical spring-loaded safety valve. Figure 2-5.—A cross-sectional view of an injector. 2-4

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