CPVC Pipes & Fittings :
Installation Guidelines Of Ori-Plast CPVC Pipeline
         
  Cut the pipe square and remove the burrs either with a chamfering tools or a file. Preferably the end should be beveled to 100 – 150 to minimize the chances of wiping of solvent cement from fitting.    
         
  Clean the pipe end and the fitting properly to remove dirt or moisture. Check the pipe and the fitting for dry fit. The pipe should go into the fitting ⅓ to ⅔ of the fitting depth before it makes contact with the fitting wall to ensure the joint quickly attains the desired handling strength and gives good long term service.    
         
  CPVC pipes and fittings are joined by specially formulated Ori-Plast CPVC Solvent Cement which can withstand high temperature and operation.    
         
  There are two process of joining CPVC pipes and fittings. It is either a one or two step process. The most commonly used process is the one step process which does not require the use of a primer. The colour of the cement used in this process is yellow.    
         
  Use a suitably sized dauber/brush to apply a light coat of cement inside the fitting and heavy coat on the pipe end. In case of pipes above the size of 32mm (1¼”) first apply a coat of cement on the pipe end, then in the fitting/socket and lastly again on the pipe end.    
         
  The pipe is then inserted in the socket/fitting and bottom all the way to the stop with a ¼ turn. It is then held in position for 10/15 seconds before release to ensure that the pipe does not push out of the socket/fitting. If it pushes out, holding time is to be increased.    
         
  Application of excessive amount of cement should be avoided so that it does not puddle in the socket/fitting. A good job of cementing is evidenced by an even bead or fillet of cement all around the pipe at the socket/fitting interface. The excessive cement is to be wiped off.    
         
  On smaller sizes and with shorter pieces of pipe, the joint has adequate handling strength almost immediately so that the assembly can proceed with delay.    
         
  CPVC pipe, like all other thermoplastic piping, expands when heated and contracts when cooled. Expansion is independent of the size. Thermal expansion in CPVC piping is generally accommodated at every change in direction or by offsets.    
         
         
         
         
         
  The vertical piping should be supported at each floor level or as required by expansion / contraction consideration. Wider bearing surface of the support, the better it is. Point support must be avoided. Ensure that the supports do not prevent thermal expansion/contraction. Concentrated loads e.g. valves, must be supported separately.    
         
  CPVC piping system of nominal sizes of 15mm (½”) to 50 mm (2”) can safely be pressure tested using cold tap water only at a pressure of 10.0 kg/cm2 after the solvent cement joints have cured for a minimum period of 1.0 hr for 15mm – 25mm pipe size and 2 hrs for 32mm – 50mm for an ambient temperature over 150C.    
         
       
         
  For new installations the above cure time is not usually a factor. However, they are a factor in repair jobs or minor revisions in piping in new installations.