sludge hole

Noun

The hand-hole, or manhole, in a steam boiler, by means of which sediment can be removed.

Japanese Meaning

蒸気ボイラーに設けられた、沈殿物を除去するための操作用穴、すなわちハンドホールまたはマンホール

Technicians inspected the sludge hole at the base of the steam boiler before starting the cleaning cycle.

技術者たちは掃除工程を始める前に、蒸気ボイラー底部の堆積物を取り除くための手穴を点検した。

Sense（1）

The hand-hole, or manhole, in a steam boiler, by means of which sediment can be removed.

sludge holes

（ plural ）