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Ahvaz Jundishapur University of Medical Sciences

Consequence Analysis of Fire and Release of Mercaptan Spills in Pressure Reducing Station of a Provincial Gas Company

Mousavi Kordmiri, Seyed Hojat and Kesmati, Shahrzad and Jodakinia, Leila and Sakari, Sogand and Hamidreza Mousavi, Seyed (2018) Consequence Analysis of Fire and Release of Mercaptan Spills in Pressure Reducing Station of a Provincial Gas Company. Jundishapur Journal of Health Sciences, In Pre (In Pre). ISSN 2252-021X

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Official URL: https://doi.org/10.5812/jjhs.67121

Abstract

Abstract Background: Mercaptans are the highly flammable and malodorous natural gas odorants in the urban gas distribution network and are used to detect gas leakage. Exposure to high concentrations of this substance has deleterious impacts on human health. Objectives: The purpose of this study was to determine the hazard distance and to examine the consequences of fire and the distribution of Mercaptans spills in its containing station in a specific provincial gas company. Methods: Modeling scenarios were defined based on the valid existing events and related consequences with respect to the gas pressure reducing station. To determine the safe distances of hazardous areas, applicable data and criteria were used in accordance with total GS SF 253. These criteria include the amount of flammable radiation in the event of Mercaptan fire, the amount of LFL (low flammable level) Mercaptan distribution, and the distribution rate of various concentrations of Mercaptan (0.5, 10 and 100 ppm). Subsequently, modeling was performed using input parameters and via PHAST software. Finally, the consequence evaluation of scenario occurrence and hazard distance were identified through the modeling results. Results: The distribution and pool fire caused by Mercaptan spill from containers were considered as the worst scenario at the respective gas station. Results from the modeling indicated a large distance distribution (3997 m) from the concentration of 0.5 ppm of Mercaptan (concentration of respiratory tract burning threshold) in case of a spill. Furthermore, according to the results of modeling in the event of a fire, the maximum radiation distance is 4.7 kW/m2 in the 10/D climate class, which extends up to 28 meters. Conclusions: Given the distribution of Mercaptan at long distances and the proximity of gas pressure reduction stations of the respective gas company to the residential and medical facilities, it is strongly recommended that the location of these barrels be moved away from residential areas

Item Type: Article
Keywords: Keywords: Consequence Analysis, Hazard Distance, Mercaptan Spill, Gas Pressure Reducing Station, PHAST
Subjects: R Medicine > R Medicine (General)
Divisions: Faculty of Medicine, Health and Life Sciences > School of Medicine
Depositing User: آقای بهرام سوسنی غریب وند
Date Deposited: 28 Aug 2018 06:50
Last Modified: 28 Aug 2018 06:50
URI: http://eprints.ajums.ac.ir/id/eprint/20150

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