PID diagram
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What type of controller is HIC, where does it originate from, and since there is no feedback, what category does this control method fall into? What does TSO mean? The operating condition is that the exhaust gas from the cyclohydrogen compressor is sent to the flare; please have the experts discuss this
This post was last edited by ylb913 on 2018-7-21 at 12:15. HIC is a control valve for indoor manual switches, with an opening range of 0–100%; it can only be operated manually, as there is no automatic control mechanism. We have a control valve of this kind*, commonly referred to as a “manual operator”. FC means the valve closes in case of a failure, while TSO means tight shut off, which refers to a complete and secure closure!
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The HIC handheld controller – TSO is not the standard designation; we use CSO. It is not allowed to shut it down without approval
HIC is the remote control operation circuit； TSO is a tight shut-off with no leakage.
CSO generally refers to a process manual valve, meaning a lead seal
TSO means tight shut-off; the PID legend should indicate the level of closure. Typically, it is required that the CSO valve seal be in the open state at level V, while the CSC seal should be in the closed state. HIC refers to remote control via DCS, and together with the HVT valve position transmitter, it enables the valve position to be displayed on the DCS system as HVI