HAZOP studies are widely accepted in chemical and petroleum industries as the method for conducting process hazard analysis related to design, maintenance and operation of the systems. In this paper, a HAZOP reasoning method based on function-oriented modelling, multilevel flow modelling (MFM) is extended with function roles to complete HAZOP studies in principle. A graphical MFM editor, which ...

HAZOP studies are widely accepted in chemical and petroleum industries as the method for conducting process hazard analysis related to design, maintenance and operation of the systems. Different tools have been developed to automate HAZOP studies. In this paper, a HAZOP reasoning method based on function-oriented modeling, Multilevel Flow Modeling (MFM), is extended with function roles. A graph...

The Hazard and Operability (HAZOP) study is the most commonly used process hazard analysis (PHA) method in the process industries. While the HAZOP method provides a more thorough and complete treatment than other classical PHA methods, HAZOP studies tend to be tedious and time-consuming which can compromise the quality of the work performed. Major Hazard Analysis (MHA) was developed in an attem...

HAZOP is a powerful hazard analysis technique which has a long history in process industries. As the use of programmable electronic systems becomes more common, it is clear that there is a need for a HAZOP method which can be used effectively with such systems. This paper describes several attempts to derive such a process, and identifies some requirements which must be met by any PES HAZOP pro...

Concerned with serious problems regarding security as a safety issue, a HAZOP specifically suited for identifying security threats has been developed. Unfortunately, the emphasis placed on security issues when developing safety critical systems is to often inadequate, possibly due to the lack of ”safety-compliant” security methods. Having had the opportunity to adapt the HAZOP-principle to the ...

The study of serious accidents, which have occurred in the chemical process industry in recent times, highlights the need to understand fluid property related phenomena and the interactions between chemicals under abnormal process conditions or with abnormal fluid compositions. Consideration of these issues should be common practice in professional safety analysis work, and computer programs de...

This paper describes the work done by SINTEF on HazOp on a safety critical, software intensive system and the lessons learned in the process. The lessons concern two areas – the HazOp process and the use of the HazOp to formulate lower level safety requirements. We describe a HazOp process based on system functions instead of the overall system functionality and how to use software related guid...

Safety is an important issue in process design and operation in the chemical process industry (CPI). It is even more critical for modern chemical manufacturing processes, which are either operated under extreme conditions to achieve maximum economic profit, or are highly flexible. The importance of safety analysis in process operation is well recognized after occurrence of several tragic accide...

Hazard and operability (HAZOP) methodology is a Process Hazard Analysis (PHA) technique used worldwide for studying not only the hazards of a system, but also its operability problems, by exploring the effects of any deviations from design conditions. Our paper is the HAZOP review intended to gather HAZOP-related literature from books, guidelines, standards, major journals, and conference proce...

A strategy and relating activities of a software safety analysis (SSA) are presented for the software of a digital reactor protection system where software modules in the design description are represented by function blocks (FBs). The SSA, as a part of the verification and validation activities, was activated at each phase of the software lifecycle. For the SSA of the FB modules, the software ...