Accidents Have Caused Major Explosion

Accidents Have Caused Major Explosion In the past few years there had been a steady increment in the usage of the risk assessment in the offshore production facilities. This is especially after the Piper Alpha disaster in 1988 and many other major accidents that killed many lives. Operators are showing an increasing awareness by reviewing the safety of their existing topside production facilities. The Piper Alpha accident provided adverse confirmation that the predictions of risk analyses regarding major accidents were certainly prudent. Quantitative Risk Assessment (QRA) is very useful in order to reduce the risks especially on the hydrocarbon releases from offshore topsides facilities. (Harmony, 1998) The accidents have caused major explosion and followed by some other minor explosions that release huge amount of hydrocarbons such as gas, liquid and 2-phase liquid. According to the investigation report that had been made after the accident, the main reason that causes the accident is the handover work made by two diff erent shift personnel. Communication problem is one of the reasons of the tragedy. Initially the platform only produced crude oil. However, after a few years natural gas is also being produced. During the installation of the gas conversion equipment, the fire walls were not upgraded to the blast wall that causes a severe explosion throughout the disaster. Moreover, the pumping operation of oil and gas was continued even though the fire started to spread on the platform due to lack of professed authority that just witness the burning of the Piper (Taylor, Wallace, & Ward, 1991). It was started from the two condensate injection pumps which are A and B. The day shift engineer forgot to inform the condition of pump A to the night shift engineer in which the pressure valve was removed for recalibration and recertification. There are about 106 recommendation has made for the future of safety offshore by the Cullen Report. All of the recommendations had been accepted and implemented by the offshore operators later then (Simon, 2012a). Petrobras Enchova Central Platform was listed in the major offshore accidents. This platform also listed as one of the worst and notable blowouts in the history of offshore oil platform. It is located in the Enchova Field, Brazil and operated by Petrobras. Two major incidents recorded in these fields which were on 16 August 1984 and 24 April 1988. The first accidents caused by blowout followed by explosion and fire. Most of the personnel were evacuated safely by chopper and lifeboat. Unfortunately, 42 workers died during the evacuation processed. The main reason that killed many lives during evacuation is because the failure of lowering mechanism of a lifeboat. The lifeboat was suspended and eventually fell 10-20m to the sea which killed 36 personnel. The other six workers were killed when they jumped from the platform to the sea at 30-40m height. (Simon, 2012b) The second accident occurred on 24 April 1988 which is four years later dur ing the workover operations on the platform. One of the well that operated by the platform blew out and finally ignited that resulted in the destruction of the platform. Petrobras decided to drill two relief wells in 30 days’ time and eventually succeed in controlling the blowout (Maduro & Reynolds, 1989). The workover well was performed in order to convert oil well to gas well. Then the blowout occurred during that converting process. The fire resulted from gas ignition last for 31 days. There was no loss of life recorded because the floating living quarters were separated from the platform during the blowout. The operator incurred a total loss because the extensive damage to the topside structure (Simon, 2012b).