Why are boiler manholes elliptical in shape?

The boiler manhole-lid is mounted from the inside of the boiler so that the boiler pressure will help to keep it tight. Hence the manhole has to be elliptical in shape to make it possible to take the lid out from the boiler. -------------------------------------------------------------------------------- Question: Boiler pressure In tanker vessels we use boilers for cargo heating.

Lets say that steam pressure to deck line adjusted to 5 bar. More.

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