Quantcast WASTE  AND  SOIL drainage Diagram

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line. Figure 8-24 shows typical hot- and cold-water service  lines  for  a  single-story  residential  building and how they are connected to feed the fixtures. This   type   of   layout   is   often   called   a   RISER DIAGRAM.  This  diagram,  in  isometric,  is  a method  of  visualizing  or  showing  a  three- dimensional picture of the pipes in one drawing. WASTE  AND  SOIL DRAINAGE  DIAGRAM Figure 8-25 shows the waste and soil pipes and. associated fitting symbols in a riser diagram. The arrow  represents  the  direction  of  flow.  If  you notice,  all  the  pipes  are  sloping  towards  the building drain. Figure 8-26 further shows the basic layout of a drainage system. The function of each part  is  as  follows: .   FIXTURE   BRANCHES   are   horizontal drainpipes connecting several fixtures to the stack. .  A  FIXTURE  DRAIN  extends  from  the P-trap  of  a  fixture  to  the  junction  of  that  drain with  any  other  drainpipe. l   S O I L    A N D    W A S T E    F I X T U R E BRANCHES  feed  into  a  vertical  pipe,  referred to as a stack. If the waste carried by the fixture branch  includes  human  waste  (coming  from  water closets or from a fixture with similar functions), the  stack  is  called  a  SOIL  STACK.  If  a  stack carries waste that does not include human waste, it  is  referred  to  as  a  WASTE  STACK.  These stacks service all the fixture branches beginning at  the  top  branch  and  go  vertically  to  the  building drain. .  A  BUILDING  DRAIN  (also  referred  to  as a  house  drain)  is  the  lowest  piping  part  of  the drainage  system.  It  receives  the  discharge  from the  soil,  waste,  and  other  drainage  pipes  inside the building and extends to a point 3 ft outside the building wall. (Most local codes require that the  house  drain  extend  at  least  3  ft  beyond  the building wall, but a few local requirements range from  2  to  10  ft.) .  A  BUILDING  SEWER  is  that  part  of  the horizontal  piping  of  a  drainage  system  that extends  from  the  end  of  the  building  drain.  It Figure 8-26.-Basic layout of a drainage system. 8-19

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