How to distinguish between vent valves and drain valves on a process flow diagram?
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I would like to ask the teachers: How should vent valves and drain valves be distinguished and represented on a process flow diagram?
I distinguish them based on the location in the process piping and the process markings! There is no clear distinction in the legend!
Add notes such as installation location and function; it seems there is no specific way to label the legend
The destinations for venting and draining are different; those of us in operations and maintenance usually rely on the drawings to tell them apart
Generally, the vent valve is drawn pointing upwards, with the discharge flowing downwards. This way, everyone will understand at a glance! Or you can also specify the code in the image on the homepage!