Instant power failure detection method and apparatus to discard power failure as case scenario in flare systems design

Abstract

Systems, methods and apparatus include a computer-implemented method that performs the following. First inputs are received from a first monitoring of the main power distribution system (MPDS) at a safety instrumented system (SIS) logic solver. The first inputs include power status information for equipment monitored by a main distribution switchgears (MDS). A second input is received at the SIS logic solver, from a second monitoring of the MPDS. The second input includes power status information for equipment monitored by a motor control center (MCC). SIS logic solver logic in the SIS logic solver is executed by the SIS logic solver using at least one of the first and second MPDS inputs. Upon confirmation of a power failure in the MPDS detected instantly by MDS or MCC functional safety capable controllers, the SIS logic solver logic generates an output signal to cut an incoming feed to processing plants, leading to discard power failure as a worst credible design case scenario for flare and disposal relief systems, the worst credible design case scenario caused by at least one of the first inputs and the second inputs.