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Piping and Fitting General Requirements

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Figure 7-3.—Typical building water supply system. Figure  7-4.—Corporation  stop. provides  for  circulation  of  the  hot  water  at  all times.  The  circulation  is  created  because  warm water tends to rise and cold water tends to fall. The circulating system shown in figure 7-2 is known  as  an  overhead  feed  and  gravity-return system  because  of  its  construction.  This  type  of system tends to become airbound, preventing cir- culation of the hot water. Since air collects at the highest point of the distribution piping, the most practical way to relieve the air lock is to connect an uncirculated riser to the line at that point. Any air lock that develops is relieved when a fixture on the uncirculated riser is used. Piping and Fitting General Requirements A  typical  building  water-service  line  is shown  in  figure  7-3.  This  line  is  composed  of  a corporation   stop,   a   flexible   connector,   a   curb stop,  a  stop  and  waste  valve,  and  a  meter  stop or  gate  valve. Figure 7-5.—Flexible gooseneck connector. The corporation stop is installed at the loca- tion (fig. 7-4) on the water main where a tap is made.  Its  function  is  to  make  the  removal  of the  taping  machine  and  the  installation  of  the remaining  fittings  easier  by  securing  the  water flow  from  the  tap.  A  corporation  stop  may  not be  needed  if  you  are  installing  building  service lines from a newly installed, unpressurized water main. When  you  install  the  line  between  the  corpora- tion  stop  and  the  curb  stop,  use  some  type  of flexible connection for joining the pipe to the cor- poration  stop.  This  flexible  connection  protects the corporation stop from strain or damage that can result from any movement of the water main or  service  pipe  because  of  settling,  earth  move- ment,  or  expansion  and  contraction. Several types of flexible connectors are used. The  type  you  choose  will  depend  on  the  type  of material  used  for  the  supply  line.  A  gooseneck (fig.  7-5)  is  used  when  galvanized  iron  or  steel 7-17



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