A cause-and-effect diagram illustrates logic for a function where two valves will be closed and a pump

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A cause-and-effect diagram illustrates logic for a function where two valves will be closed and a pump will be de-energized when either of two pressure sensors detects that pressure in a vessel is too high. Valve 1 cuts off inlet feed to reduce pressure in the vessel. Valve 2 closes the outlet to prevent process disturbance downstream. The pump is turned off by de-energizing motor contactors to prevent pump failure.

What equipment is part of the SIF?

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