RUBBER RING SOCKET AND COUPLING

  • Before installation, it is prudent to check both the spigot and socket for any damage. Spigot chamfer and sealing ring should be especially examined. Chamfering should be done at an angle of 15 degrees from the axis of the pipe till it reaches half the thickness of the pipe wall. A fine toothed saw may be used for cutting the pipes and a file or specialized chamfering should be used for completing the chamfer. After removing swarf and burrs from the chamfered spigot, the sealing ring should be seated in the socket groove, complete with the uPVC insert ring. All portions of the joint must be thoroughly checked for damage.

  • The depth from the mouth of the spigot to the shoulder of the socket is the spigot insertion depth. This should be clearly marked on the spigot, including any tolerances for anticipated changes in operating temperatures.

  • The mating areas of the spigot and socket should be free of dirt or moisture before sealing takes place.

  • Proper lubrication of the spigot end and triple seal portion  up  to   the  full   insertion depth and circumference must be done before sealing. There must never be any dry areas on the mating surfaces. 
  • The lubrication must not be allowed to run dry before the spigot and  the  socket are brought into contact. Alignment is crucial at this   stage  and   therefore,  the spigot should be inserted into the socket by hand till the inner sealing ring offers resistance. The jointing procedure can now be completed.

 

LEVERAGE JOINTING
This method can be used for pipe sizes up to  nominal  diameter  of  8   inches. A crow bar, with a stout timber inserted between it and the pipe is used  to  leverage  the  joint.  This  is done to avoid damage to the pipe. A steady pressure is applied till the spigot insertion depth mark coincides with the mouth of the socket being jointed. If   there is any undue resistance felt during the jointing, the joint should be disassembled to  check for improper lubrication or a pinched or trapped sealing ring.

A few essentials must always be remembered while jointing.

  • Spigot and sealing ring must be well lubricated.

  • The pipes must be properly aligned.

  • Use of excessive force while jointing can damage the pipes permanently.

  • The spigot should be inserted only up to the depth insertion mark.