P&ID diagram issues
Thread Content
What does the diamond-shaped square mean? Two alarms are connected to output the stop signal.
The diamond block represents an interlock signal, the alarm and its settings are function codes, and there is a chain signal output at the same time.
Indicates interlock signal, intlock
Please read the Instrument Engineer's Technical Manual carefully. Chapter 1 contains a lot of basic knowledge.
It means logical parking! INT = Interlock
The main thing is that there are two interlocks on a picture. One input is useless (INT), and two inputs are used.
The first one is to alarm, the second one is to alarm and chain
The two connections are all rectifier stops, one is for high chlorine pressure, and the other two are for chlorine and hydrogen pressure difference high and low. I suspect that the design institute made a mistake. But not sure