Joining Cast Iron Pipe

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 Two basic categories are there to join cast iron pipe

  1. Hub & Spigot Joint.
  2. Hubless pipe coupling.

1) Hub & Spigot Joint :

  • Hub & spigot joint uses pipe with two different end types.
  • The hub end of pipe has an enlarged diameter, thus resembling bell.
  • The spigot end of the adjoining pipe has a flat or plain end shape.
  • The spigot is inserted into the bell to establish a joint.
  • Two methods are there for preventing leaks on hub & spigot joint
 i) Compression joint: it uses a one piece rubber gasket to create a leak proof seal. this joint can absorb vibration and can be deflected upto 5 degree without leakage or failure.


ii) Lead & Oakum joint : This joint is made with oakum fibre and molten lead to create a strong, yet flexible, leak proof and root proof joint. When the molten lead is poured over the waterproof oakum fiber, which is a loose, oil laden hemp like packing material, the joint becomes completely sealed. water will not leak out and, when used underground, roots cannot grow through the joints.


2) Hubless pipe coupling :



  • This method of joining these pipe and fittings uses a coupling that slips over the plain ends of the pipe and fittings and is tightened to seal the ends.
  • It is made only in one wall thickness and ranges in diameter from 11/2" to 10".

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