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Kiln tyres, or riding rings, serve to

  • A.carry the weight of the shell on its support rollers
  • B.seal the kiln against any escape of hot gas at the ends
  • C.hold the refractory bricks firmly in their position
  • D.drive and control the rotation of the whole kiln shell

Answer: A

Correct answer: carry the weight of the shell on its support rollers

The tyre is a heavy steel band around the shell that transfers the whole weight of kiln, refractory and charge onto the support rollers. The shell alone could not carry that load without ovalising, so the tyres are what make the arrangement possible - the drive is a separate gear ring.

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