Level measurement problem
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For the third-level major hazard source, namely the crude benzene storage tank, there is currently one single-flange level transmitter that feeds data to the DCS system for controlling the inlet and outlet shut-off valves based on high and low level readings. After installing the SIS system, the existing single-flange level transmitter will be replaced with a tee connection, followed by another single-flange level transmitter that feeds data to the SIS system. (Is it acceptable for the SIS and DCS to use the same pressure sensing point?) ）
I don’t think it’s allowed; what if it gets blocked?
SIL1 is theoretically possible; isn’t there any opening at the top? It would be great to have a radar, right?
There’s no need to think about it; it’s definitely not possible. It is best to install another level gauge, such as a radar at the top filling opening. Or it’s a borderline solution: add a one-to-two safety relay to the SIS system cabinet, connecting it to both the SIS and DCS systems. Of course, this is a borderline approach; it’s only an option when no other solution is available