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Dear sea friends, please let me know if the interlocks on your installations have been installed

2012-03-22View Original

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3.1.1 Interlock of the electric valve MV-10201A at the outlet of the reaction feed pump P-102A: When the reaction feed pump is operating, the electric valve MV-10201A remains in the open position; however, it closes when either of the following conditions occurs. A. The reaction feed pump P-102A changes from operation to stop. B. The shutdown button for the electric valve MV-10201A at the outlet of the reaction feed pump (auxiliary control panel) operates. (When the pump is operating normally, the stop button is ineffective; it becomes effective only after the reaction feed pump stops.) C. Low-low interlock for the inlet flow rate FT10201B of the reaction feed pump P-102A; interlock value: 86 T/H. The following conditions must be met first in order to open the electric valve MV-10201A. Once the following conditions are met, the electric outlet valve MV-10201A can be opened on-site only after pressing the RS-0101 reset button on the button operation screen first. A. The reaction feed pump P-102A stops. B. The shutdown button for the electric valve MV-10201A at the outlet of the reaction feed pump (auxiliary control panel) is functioning properly. C. The inlet flow FT10201B of the reaction feed pump P-102A is in bypass mode (interlocks are activated once the flow reaches normal levels). 3.1.2 Interlocks for starting and stopping the reaction feed pump P-102A: The reaction feed pump P-102A stops under the following conditions: A. Low low interlock on the inlet flow rate FT10201B of the reaction feed pump P-102A; interlock value: 86 T/H. B. Low low interlock based on the minimum value of the lubricating oil pressures PT10501A, PT10502A, and PT10503A; interlock value: 0.08 Mpa. C. Low low interlock based on the minimum value of the liquid levels LT10201, LT10202, and LT10203 in the filtered raw material buffer tank D-102; interlock value: 4.9% (0.45 meters). D. The emergency stop button for the reaction feed pump P-102A/B (auxiliary control panel) HS-10201 is activated. E. Low-low interlock for the flow rate FT10502B at the outlet manifold of the reaction feed pump P-102A/B; interlock value: 56 T/H. Start-up conditions for the reaction feed pump P-102A. Note: The pump must be started on-site; it cannot be started from the control room. A. The reaction feed pump does not have interlock conditions for shutdown. B. The pressure PT15054A in the main oil supply line of the reaction feed pump P-102A is normal (greater than 0.2 Mpa). C. Press the RS-0301 reset button on the operation screen before starting the pump. It’s quite complicated; can some interlocks be bypassed?
Reply #22012-03-22
Interlocks are designed to ensure the safe operation of the equipment, and they should all be activated.
Reply #32012-03-22
Interlocking is designed to ensure the safe operation of the equipment, and it is fully activated in our system.
Reply #42012-03-22
The intentions behind setting up interlocks are always good, but in actual operation, some of them must be suspended! Otherwise, a signal issue could cause significant fluctuations in the device’s operation or even lead to its shutdown!

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