A prototype prediction based intelligent diagnostic system that is capable of integrating qualitative and quantitative process models and operation experience in the form of HAZOP result tables is proposed in this paper. The knowledge base of the system is organized in a hierarchical way following the hierarchy levels of the multi-scale model of the process system. This supports the focusing of...

The HAZID knowledge-based system was developed as part of the EC-funded “STOPHAZ” project, whose brief was to investigate the use of software tools for improving safety in chemical process plants. HAZID models the behaviour of a plant qualitatively, so that the potential hazards of equipment failures can be detected. The models in HAZID are based around the signed directed graph, and hazard ide...

As part of a preliminary hazard analysis for a new phenol plant, the results of a hazard and operability study (HAZOP) conducted in the initial stages of the project design were re-evaluated due mechanical failure detected during the test operation. Out of the possible mechanical defects for the crude phenol column (CPC), the fact that the lowest risk grade was given to the column without consi...

Standard safety analysis techniques are often ineeective when computers and digital devices are integrated into plant control. The Safeware methodology and its set of supporting safety analysis techniques (and prototype tools) includes modeling and hazard analysis of complex systems where the components may be a mixture of humans, hardware, and software. This paper describes one of the Safeware...

Organic hydride hydrogen refueling stations have been remarked as that can employ a practicable method based on the organic chemical system involving methylcyclohexane (MCH) for transport of hydrogen. This station has advantages in storage and transportation MCH does not require large amount energy compared to compressed liquefied hydrogen, use existing infrastructure. type involves some hazard...

this research was undertaken to evaluate and determine the risk of gas fluids and leakage of persian gulf star refinery on the environment in bandar abbas. through collection and compilation of research findings, we attempted to identify and work on factors leading to environmental risks. the risk factors were identified by hazop team and the risk score was calculated by multiplying the probabi...