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A long rectangle with domed ends, lying on its side.
Also known as: Horizontal drum symbol, Knockout drum symbol, Separator drum symbol
On a process diagram a horizontal pressure vessel, often called a drum, is drawn as a long rectangle on its side closed by curved ends.
Denotes a pressure vessel installed horizontally, commonly used to separate liquid from vapour.
Contexts: Technical drawing
Is drawn horizontally because orientation matters to the process: a horizontal drum gives a large liquid surface for separation that a vertical one does not.
Contexts: Technical drawing
A long rectangle lying horizontally, closed at each end by an outward curve.