Solve the electrical interlock of instruments in the diagram
Thread Content
Solve how interlock control is implemented in the figure below
Some of the abbreviations in your PID are unclear as to what they mean; I can only get a general idea.
A PID diagram shows the connections of the devices, but does not illustrate the logic of interlock control. Only the approximate function can be inferred from the basic functions of the devices and their interconnections: the two IS602 boxes in the diagram represent the same functional block ； The signals generated by P6208 and H6201 are processed by IS602, and then H6201 is controlled via EPR ； The valve in the upper left corner of the EPR, along with V6201 below it, need to be considered in relation to the process and the functions of the EPR; it is likely that the pressure generated by the valve above controls the status of both the EPR (H6201) and V6201. .
Is a control valve and a on/off valve connected in series to control pressure? What pressure are you trying to control? Is it the equipment pressure or the pipeline pressure? It’s generally to control the device pressure, right? Control the device pressure. Is there anything wrong with this control scheme? To control the pipeline pressure, it is normally done by using a control valve; when the pipeline pressure becomes too high, the interlock system shuts down the shut-off valve HV-6201 and opens V-6201. This is just my guess – it’s best to check NOTE3 in your diagrams
The pressure PISA6208 signal is fed into the SIS safety instrument system; the low-pressure signal triggers the valve 6201 to close