What does HSM mean on a PID diagram?

2019-12-06View Original

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What does HSM mean on a PID diagram?

Reply #22019-12-06

Is there any explanation in the legend regarding the numbering rules? The diagram you provided is incomplete; it’s not clear which device’s points these are. I guess they might be buttons for switching between remote and local mode

Reply #32019-12-08

Y is EVENT STATE OR PRESENCE, the state； I is: INDICATE meaning to show/signal ； H stands for: HAND(MANUALLY) OPERATED, which means manually operated ； S stands for SWITCH, and M stands for MIDDLE NTERMEDIATE; I’m not quite sure about what M means

Reply #42019-12-08

Personal understanding: YI: Remote status monitoring in the control room； HSM: A manually installed on-site switch button.

Reply #52019-12-13

The answer on the 4th floor should be fine; the original poster can consult the designers to find out whether the device installed at the tower’s top exit is an electric shut-off valve

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