Improved Safety and Reliability by Improved Trip Interlock Systems

摘要

It is challenging and demanding to achieve both Safety and Plant Reliability simultaneously when the trip interlocks of the plant is active. Plant personnel's aim is to keep trip interlocks of Ammonia Plant in line without facing plant shut down due to false or spurious trips. Gaps in redundancy, switch malfunctioning, control system card failures, impulse line choke, instrument isolation valve failures and solenoid valve failures are discussed. Case studies for solving these problems are successfully explained in this paper. This paper provides insight into how Nagarjuna Fertilizers and Chemicals Limited (NFCL), India has achieved both Safety and Reliability by implementing these modifications.