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An in-line fitting allowing flow to be seen.
Also known as: Sight flow indicator symbol, Flow glass symbol
On a piping diagram a sight glass is drawn as a short transparent section in the line, letting an operator see whether flow is present and what it looks like.
Denotes a transparent section allowing the flow to be observed directly.
Contexts: Technical drawing
Provides an observation that no instrument reading replaces, such as whether a stream is carrying colour, solids or two phases.
Contexts: Technical drawing
A short section of the flow line drawn with a circle or a pair of parallel lines marking a transparent window.