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Due to the difference in kiln shell outer and tyre inner diameter,kiln revalotion is more then tyre.The slippage of shell inside tyre is called migration.When tyre and kiln become rigid so the air gap become zero between both and migration get zero.Migration tell us only that there is air gap.actual air gap is necessery for shell expantion.

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12y ago
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Q: Why migration is necessary in kiln?
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