Layers of protection analysis to achieve safety integrity level (SIL), Case study: Hydrogen unit of refinery
Journal Title: Scientific Journal of Pure and Applied Sciences - Year 2016, Vol 5, Issue 11
Abstract
To identify and evaluate hazard in process industries as oil and gas, there are various methods in which hazard and operability study (HAZOP) and layers of protection analysis (LOPA) are the most common methods. The present study aims to analyze layers of protection to achieve safety integrity level in hydrogen unit of refinery. After performing library studies and data collection of events in refinery, hazards of hydrogen unit as operating nodes and deviations with causes and consequences are identified using HAZOP method. The next stage is presenting corrective solutions by LOPA method and target factor. Then, frequencies are determined for the initiating event by the experts. By completing the sheets of each event, independent layers of protection and integrity level are determined. The results of evaluation of identified risks showed that 11 cases had risk higher than 15 and it is not acceptable. The analysis of consequence of hazards showed that for 6 hazardous points, independent layers of protection can reduce risk as 100% to target factor (10-5) and safety integrity level is fulfilled. Regarding the eighths scenario “elimination of repulsive system of equipment and lines with the high temperature of very hot steam”, layers of protection cannot increase safety integrity level to more than 60% (10-3) and to provide safety to target factor, after eliminating the identified problems, other layers are positioned. In this study, to achieve safety integrity level in hydrogen unit of refiner. A three period plan (short-term, mid-term and long-term) is proposed.
Authors and Affiliations
Akram Delavar| Department of Environment Management, Faculty Marine Science and Technology, North Tehran Branch, Islamic Azad University, Tehran, Iran., Mahnaz Mirza Ebrahim Tehrani*| Department of Environment Management, Faculty Marine Science and Technology, North Tehran Branch, Islamic Azad University, Tehran, Iran., Seyed Shamseddin Alizadeh| Department of Occupational Health Engineering, Tabriz University of Medical Sciences, Tabriz, Iran.
Keywords
Related Articles
- EP ID EP473
- DOI 10.14196/sjpas.v5i11.2270
- Views 463
- Downloads 25
Identifying and ranking factors affecting entrepreneurship success in palm industry
Influencing physical environment and valued-entrepreneurship effects on community; it reduces unemployment by creating value; it also leads the society to employment and production rather than consumption. This study a...
Rural tourism development planning in Kohgiluye and Boyerahmad
Boost tourism and travel, national, regional andinternational tourism industry is called today, it will be remembered, theresult of fulfilling this need of rest and recreation. Attention to ruraltourism, especially in...
Comparison of physiological load among different sizes of computer mouse
The purpose of this study is to compare the difference in physiological load among three different sizes of computer mouse. The mouse is one of the most commonly used input devices for controlling computer system. Howe...
Effect of nitrogen and sulphur fertilizer levels on growth, yield and oil content of Linseed (Linum usitatissimum L.) in
The experiment was conducted on research field of Sinana Agricultural Research Center (SARC), in the highlands of Bale, South-eastern Ethiopia during the main cropping season of 2013 to investigate the effect of nitrog...
Engineering strategic approach as organizational necessary
The article supports previous evidence that, even in host environments with high cultural distance and constraining employment frameworks, engineering planning, engineering are able to find room for engineering managem...