Case Study - Learning from an Explosion in Hydrocarbon Handling Facility Dr. NJ Singh Udaipur 20-08-2010.

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Case Study - Learning from an Explosion in Hydrocarbon Handling Facility Dr. NJ Singh Udaipur

@NJS/2010/ 2 The Installation about 1979

@NJS/2010/ 3 Pemex LPG and Surroundings Pemex LPG Facility SCALE - 1: 20,000

@NJS/2010/ 4 Pemex LPG PEMEX LPG Installation SCALE 1 : 2200

@NJS/2010/ 5 Damaged Area & Position of Bullets/Major Fragments

@NJS/2010/ 6 Another Fire Ball FROM AN UN-IDENTIFIED SPOT

@NJS/2010/ 7 Aftermath A major cylinder Fragment An aerial view after the disaster

@NJS/2010/ 8 Destroyed Site A burnt truck at site A view of Bullets Area

@NJS/2010/ 9 Destroyed Houses A house destroyed by sphere fragment Another destroyed house

@NJS/2010/ 10 Adjoining Industries Gasomatico (l) and Unigas (r) destroyed cars with LPG Bottles

@NJS/2010/ 11 The Events Log Times of disturbances, registered by the seismograph of the University of Mexico, on 19 th November h 44 min.52 sec. 5h 46 min.01 sec. 2.5h 46 min.01 sec. 3.6h 15 min.53 sec. 4.6h 31 min.59 sec. 5.6h 47 min.56 sec. 6.6h 49 min.38 sec. 6h 54 min.29 sec. 7.6h 54 min.29 sec. 8.6h 59 min.22 sec. 9.7h 01 min.27 sec. Disturbances number 2 and 7 were the most intense. Both had, according to the Seismic Service of the University of Mexico, an intensity of 0.5 on the scale of Richter.

@NJS/2010/ 12 The Sequence of Events 19 Nov Start of events 05.46First major explosion 06.00Police closed roads, first emergency personnel arrive 06.15Army implements disaster scheme 06.54Second major explosion 07.00Panicking, caused especially by live television 08.00Roads became congested with refugees 09.00Nearby hospitals became overcrowded 10.00Private help gets under way 11.00End of explosions 15.30Fire under control 20.00Fire extinguished

@NJS/2010/ 13 Emergency handling When the telephone started ringing shortly afterwards, the brigade had already left. On Monday, 19 November 1984, at approximately 5.45 a.m., the Mexico City fire brigade witnessed at large distance an explosion accompanied by a fireball. When the telephone started ringing shortly afterwards, the brigade had already left. So had personnel of other fire stations in Mexico City and surroundings.

@NJS/2010/ 14 In the meantime, the highway patrol had been alarmed and they implemented "Operation Vulcano". In conformity with this operation scheme, every highway that led to the disaster area was closed to all private traffic. The Secretary for National Defense implemented disaster scheme DN-111-E from his residence after some time. The Central Military Hospital was instructed to open its doors to the incoming wounded at the same time. Emergency handling

@NJS/2010/ 15 Scale of Events First of all, some rough figures must serve to illustrate the immense and complicated task the emergency services were faced with. An area of a few square kilometers was affected by the disaster, its extent ranging from complete destruction and minor fires, to scattered damage, caused by flying debris from exploding gas tanks. 150 homes were estimated to have been completely destroyed a few hundred sustained damage of a different nature.

@NJS/2010/ 16 Scale of Events There were 500 people dead and 7000 wounded, some of them with burns, in the area in question. Some 1000 people were more or less seriously affected. At least 200,000 people were evacuated during the course of the emergency operations.

@NJS/2010/ 17 Scale of Events The event took place within a time span of hours emergency workers are thought to have been involved in this particular disaster. They were members of the fire brigade, the police, the army, ambulance personnel, subway personnel and many others.

@NJS/2010/ 18 Impressions of Action by Fire Services Only minutes elapsed before the various emergency services, such as the fire brigade, the police and the ambulance services arrived on the spot. The magnitude of the fires, the heat radiation and the continuous threat of exploding gas tanks called for prudent action, which resulted in the fire brigade having to work their way into the village from outside. The fire was prevented from spreading, minor fires were put out and first aid was given where necessary. The second major explosion took place during these actions. Eyewitnesses spoke of a wall of fire and heat that was closing in on them and forced emergency personnel into a temporary withdrawal.

@NJS/2010/ 19 According to an interview by the press with a member of the emergency services, the rescue personnel had to work under dramatical circumstances; Rescue teams had to decide who was to be rescued and who was not. That is why hopeless cases had to stay behind in favor of victims with better chances. The fire brigade was only after considerable time able to install jet sprays to cool the storage tanks at plants in the vicinity. Fortunately the tanks in that area did not explode. Impressions of Action by Fire Services

@NJS/2010/ 20 After the situation at the neighboring plants had been brought under control, the fire brigade were able to venture out into the grounds of the burning LPG storage and distribution center, where they tried to put out the remaining fires and cool the undamaged tanks. The fire was brought under control at 3.30 p.m. and all remaining fires had been put out at 8 p.m. There were no casualties among fire brigade personnel. The water supply did not cause any problems, although water had to be supplied by water-carrying lorries as the Chiconautla pumping- station had been damaged by the explosions. Impressions of Action by Fire Services

@NJS/2010/ 21 Impressions of Evacuation Most villagers of San Juan Ixhuatepec took flight towards the nearby highway, avenue Insurgentes Norte and surrounding hills, soon after the explosions and fires started. The first refugees arrived already at 6.15 a.m. at Indios Verdes subway station, situated km away from the village. It appears that there was no organized evacuation during the first few hours. A chaotic phase, lasting for hours, had in fact been entered into, showing the familiar picture that belongs to major disasters and accidents.

@NJS/2010/ 22 As many wounded as possible, especially those suffering from severe burns were evacuated in ambulances to nearby hospitals. At least nine hospitals, of which some are part of the Social Security Institute, were situated within a radius of 10 kilometers from the disaster area. When the nearest hospitals became overcrowded with people, provisional relief centers were set up some hours after the initial explosions, where first aid was given and a further selection of the wounded carried out. Impressions of Evacuation

@NJS/2010/ 23 Apart from the ambulances, buses, lorries and the subway were used to transport evacuees to makeshift camps, sports and health centers etc. Some 5,000-7,000 people e.g. spent the night inside the premises of the National Polytechnic Institute. Impressions of Evacuation

@NJS/2010/ 24 Helicopters from "Operation Vulcano" assisted ambulance drivers in finding their way, and took some wounded people to distant hospitals. An authorized evacuation of the area got under way after some time. Over 200,000 people were evacuated. Many of them from Indios Verdes subway station. The evacuation did not take place without incident. Especially in more distant parts of the area, hundreds of people resisted having to leave their homes, in spite of the fact that the gas storage was still on fire. Impressions of Evacuation

@NJS/2010/ 25 The Other Side At 2 p.m., only the dead remained in the immediate vicinity of the disaster area. An early mass burial was organized on the next day, to prevent the outbreak of epidemics. Only 25 of the 298 dead (up till that moment) could be identified

@NJS/2010/ 26 Official Figures of Health Ministry During the disaster –985 medics, –1780 para-medics and –1332 volunteers were giving medical assistance. They handled 7231 wounded of which 5262 were treated in provisional emergency centers wounded were taken to 33 hospitals. Approximately 900 of them had to stay there for further treatment.

@NJS/2010/ 27 Official Figures of Health Ministry By the 25th of February 1985, –710 patients had recovered, –32 were still in the hospitals and –144 people died there. For transportation purposes the emergency services used –363 ambulances and –5 helicopters. Eleven provisional shelters were established for 39,000 homeless and evacuated people. A number of 35,000 hot meals per day with a total of approximately 125,000 hot meals were provided

@NJS/2010/ 28 Learning The prediction of possible overpressures of vapor cloud explosions in a certain environment is not yet possible. Although from incident analyses by others, a certain degree of confinement has been found as a necessary condition for significant overpressures.

@NJS/2010/ 29 Learning It is likely that no significant overpressures were generated by the vapor cloud combustion in the built-up area of San Juan Ixhuatepec, although a certain degree of confinement was present. This justifies the use of a probability, which is lower than one for significant effects of overpressure following a vapor cloud ignition.

@NJS/2010/ 30 Learning It is further concluded that the damage mechanism is not just a (lifted) fireball. In case of large storage vessels the expanding ground level fires, in combination with spreading unburned LPG, may determine the damage distance. The effects of heat radiation from fireballs at greater distances from the storage site did not lead to many fatalities. It is highly unlikely that fatalities did occur at distances greater than 500 m. That means the mitigating factors at greater distances should be taken into account in case protection (housing etc.) is present.

@NJS/2010/ 31 The close layout of the storage site may have contributed to the fast escalation of the incident. The large amount of fatalities and injured people in San Juan is a result of the fact that the built-up area is situated close to the LPG-storage site, and the very high population density in that area. The housing was chiefly built after the construction of the LPG facilities. Learning

@NJS/2010/ 32 The emergency services were faced with a very heavy task in the first chaotic hours. The sequence of events was so very fast, that the services had to respond immediately on full capacity. This task was performed quite well within 6 hours all injured people had been transported to hospitals. Generally speaking it can be stated that emergency services should take into account a fast development of accidents of the type that occurred in San Juan. Learning

@NJS/2010/ 33