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Table 8-1.Sprinkler Temperature Ratings Table 8-1.Sprinkler Temperature Ratings Table 8-1.Sprinkler Temperature Ratings Table 8-1.Sprinkler Temperature Ratings Table 8-1.Sprinkler Temperature Ratings Table 8-1.Sprinkler Temperature Ratings Table 8-1.Sprinkler Temperature Ratings Table 8-1.Sprinkler Temperature Ratings Table 8-1.Sprinkler Temperature Ratings Table 8-1.Sprinkler Temperature Ratings Table 8-1.Sprinkler Temperature Ratings

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be  plated  for  appearance  or  they  maybe  coated  for protection from an adverse environment. For example, sprinklers that will be used in corrosive atmospheres are  either  lead-  or  wax-coated.   Finally,   automatic sprinklers are normally held closed  by  heat-sensitive elements that press down on a cap over the sprinkler orifice and are anchored by the frame of the sprinkler. The   heat-sensitive   elements   melt   and   release   at different   temperatures   depending   on   application. Sprinklers are color coded to identify the temperature range  rating  of  the  fusible  element  (table  8-1).  Color coding  is  not  required  for  plated  sprinklers,  ceiling sprinklers, or similar decorative types. There    are    basically    four    types    of    release mechanisms  for  automatic  sprinklers.  They  are  the fusible   link,   frangible   bulb,   frangible   pellet,   and bimetallic element. 87.362 Figure 8-14.—Fusible link automatic sprinkler. The fusible link sprinkler (fig. 8-14) is kept closed by  a  two-piece  link  held  together  by  a  solder  with  a predetermined melting point. When the solder melts, the levers pull the two-piece link apart and fly away from  the  sprinkler.  Pressure  in  the  piping  network pushes  the  cap  from  the  orifice  of  the  sprinkler  to discharge water. The  frangible  bulb  sprinkler  (fig.  8-15)  has  a small bulb made of glass between the orifice cap and the sprinkler frame. The bulb is partially filled with a liquid. Air fills the remaining space. Heat from a fire will cause the liquid to expand against the air causing the glass bulb to shatter and opening the sprinkler for water discharge. 87.363 Figure 8-15.—Frangible bulb automatic sprinkler. Table 8-1.—Sprinkler Temperature Ratings 8-10



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