Last Updated
：2025/11/29
sludge hole
（ plural ）
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The hand-hole, or manhole, in a steam boiler, by means of which sediment can be removed.
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sludge hole
Technicians inspected the sludge hole at the base of the steam boiler before starting the cleaning cycle.
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Technicians inspected the sludge hole at the base of the steam boiler before starting the cleaning cycle.
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