Abstract
Abstract - For a methanol separation column of the BPA (Bisphenol A) plant, HAZOP (hazard and oper-ability) assessment was performed and damage ranges were predicted from the accident scenarios for the fire and the explosion. As a result, the damage range of the jet fire was 20 m in the case of rupture of the discharge pipe (50 mm diameter) of safety valve, and that of the flash fire was 267 m in the case of catastrophic rupture. Also, the damage ranges of the unconfined vapor cloud explosion (UVCE) for the rupture of the discharge pipe and for the catastrophic rupture were 22 m and 542 m, respectively. For the worst case of release scenarios, safety measures were suggested as follows: the pressure instruments, which can detect abnormal rise of the in-ternal pressure in the methanol separation column, should be installed by the 2 out of 3 voting method in the top section of the column. Through the detection, the instuments should simultaneously shut down the control and the emergency shut-off valves. Key words : HAZOP (hazard and operability), risk assessment, fire and explosion accidents, safety meas-ures, methanol separation column, BPA (Bisphenol A)
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