HAZOP methodology

Designs should be based on knowledge of what the human body (and human nature) will do. Include educated operators in design reviews. The HAZOP methodology for process hazard analysis offers an excellent opportunity to identify design and procedural opportunities for inherently safer systems. After all, the OP in HAZOP stands for operability (COPS, 1992). For example, a safe start-up procedure that requires the operator to walk up and down the stairs three times to manipulate valves in the correct sequence can be made inherently safer by locating the valves so that operator has to walk up the stairs only once during the start-up. 

Ostrowski, S., Keim, K., 2008. A HAZOP methodology for transient operations. In 11th Annual Symposium, Mary Kay O Connor Process Safety Center. 

This module is divided into two sections. First one is related to hazard analysis and uses HAZOP methodology. It gives the possibility to make hazard identification reports as well as storing external sources used in the analysis, e.g. P ID (piping installation diagrams), documentation, etc. 

The team responsible to build the matrix should include, besides experienced DCU operators, automation specialists and process engineers involved in the DCU design and operation. Ideally, the experts responsible for the matrix development should integrate the H AZOF team, which is performed in a foUowing step inside the DCU basic design phase. During the hazard identification carried out with HAZOP methodology. 

There are several steps in HAZOP methodology and risk assessment, which starts with finding deviations to identify hazards. 

HAZOP methodology alternative approaches. (A) Parameter selection first, (B) guide word selection first. 

See, e.g. P.Andow, Guidance on HAZOP procedures for computer-controlled plant, HSE Contract Research Report No 26/1991 andD.J.Bums R.M.Pitblado, A modified HAZOP methodology for safety-critical system assessment mDirections in safety-critical systems,... 

Chemical Hazard Analysis (CHA)— A CHA is derived from HAZOP methodologies and can be considered a precursor to a PHA. It is applicable to analyzing petrochemical or chemical processing hazards. The same seven basic HAZOP guidewords are used no, more, less, part of, reverse, as well as, and other. While CHA assumes the proposed chemical reaction is basically safe when conducted as specified (should... 

A Modifled Hazop Methodology For Safety Critical System... 

This paper is concerned chiefly with Hazard Analysis and Risk Assessment when PES are used to carry out critical safety functions and the use to these ends of a modified Hazard and Operability (HAZOP) methodology. In order to put the HAZOP in perspective, some other major factors, influences and definitions will be addressed in the first part of the paper, beginning with the concept of Safety Lifecycle, followed by a short discussion of software risks, some case histories and a description of the development of the HAZOP approach to Hazard Analysis, including the increasing awareness of the signifrcance of human error. 

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