The MGM Grand fire occurred on November 21, 1980 at the MGM Grand Hotel and Casino (now Bally's Las Vegas) in Paradise, Nevada, USA. The fire killed 85 people, most through smoke inhalation. The tragedy remains the worst disaster in Nevada history, and the third-worst hotel fire in modern U.S. history, after the 1946 Winecoff Hotel fire in Atlanta that killed 119 people and the Dupont Plaza Hotel, San Juan, Puerto Rico fire on December 31, 1986, in which 97 perished.
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Background
At the time of the fire, approximately 5,000 people were in the hotel and casino, a 26-story luxury resort with more than 2,000 hotel rooms. Approximately 7:07 a.m. on November 21, 1980, a fire broke out in a restaurant known as The Deli. The Clark County Fire Department was the first agency to respond. Other agencies included the North Las Vegas Fire Department, Las Vegas Fire & Rescue and the Henderson Fire Department. U.S. Air Force UH-1N (Huey) from the Detachment 1, 57th FWW out of Indian Springs NV, and CH-3E (Jolly Green Giant) helicopters from the 1st Special Operations Wing out of Hurlburt Field, FL (which were deployed to Nellis AFB to participate in Red Flag '80) were the main part of a helicopter rescue effort that pulled 1,000 people from the roof of the MGM Grand. Fire spread across the areas of the casino in which no fire sprinklers were installed. Smoke spread into the hotel tower. A total of 85 people were killed and 650 injured, including guests, employees and 14 firefighters. While the fire primarily damaged the second floor casino and adjacent restaurants, most of the deaths were on the upper floors of the hotel, and were caused by smoke inhalation. Openings in vertical shafts (elevators and stairwells) and seismic joints allowed toxic smoke to spread to the top floor.
The disaster led to the general publicizing of the fact that during a building fire, smoke inhalation is a more serious threat than flames. 75 people died from smoke inhalation and carbon monoxide poisoning, four from smoke inhalation alone, three from burns and smoke inhalation, only one person died from burns alone, and one person died from massive skull trauma, caused by jumping from a high window, and one died of myocarditis.
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Cause
The fire was caused by an electrical ground fault inside a wall socket. A refrigerated pastry display case was added, after original construction of the hotel, to one of its restaurants (known as The Deli). Unlike a modern display case, which would be totally self-contained (compressor installed in bottom of display case), this unit functioned like a walk-in cooler or central air conditioning system, with a pair of copper refrigerant pipes connecting its evaporator to a compressor unit located outside the building. When this set-up was installed, the copper pipes were run through the same wall soffit as a pre-existing electrical conduit, and were in physical contact with this conduit.
The fan-forced evaporator unit in the display case was not properly secured, and thus was able to vibrate constantly while in operation; these vibrations were carried along the copper refrigant pipes, causing the pipes to rub against the electrical conduit in the wall soffit and make it vibrate too. Through a combination of galvanic corrosion (where the copper refrigerant pipes were in physical contact with the aluminum electrical conduit, causing the conduit to erode over time), and vibration - as well as jagged edges and stretched wires resulting from poor workmanship during the installation - the electrical wires inside the conduit ended up missing chunks of their plastic insulation, and the conduit was rendered un-grounded (there was no separate ground wire; the metal conduit itself was designed to function as the ground, so the disintegration of the conduit rendered the system un-grounded).
These now-bare electrical conductors inside the un-grounded metal conduit glowed red-hot and started arcing, which ignited the fire.
The fire spread to the lobby, fed by wallpaper, PVC piping, glue, and plastic mirrors, racing through the casino floor at a rate of 15-19 ft (4.6-5.8 m) per second until a massive fireball blew out the main entrance along The Strip. Seven people died in the casino. The burning material created toxic fumes and smoke, which caused the majority of the deaths.
Due to faulty smoke dampers within the ventilation duct network, the toxic fumes circulated throughout the hotel's air circulation system, accelerating the spread of the poisonous gases.
Most deaths occurred in the stairwells, where the doors locked behind each person as the only open doors in the stairwell were on the roof and on the ground floor. Most of the victims died from smoke inhalation, many of them in their sleep.
The fire was confined to the casino and restaurant areas. The hotel was equipped with a fire sprinkler system that performed properly by keeping the fire out of other sections of the building. The area with the most fire prevention was in the money counting area, not in individual rooms or on the casino floor. National Fire Protection Association (NFPA) studies show that in this fire the hotel occupants did not exhibit panic behavior. Instead, many took rational steps to preserve their lives. Examples of this include putting towels around doors (to block out smoke), notifying other occupants, offering refuge in their rooms, and using wet towels for their faces.
Sprinkler rule exceptions
The casino and restaurants were not protected by a fire sprinkler system because they were exempt from rules requiring fire sprinklers in areas occupied 24 hours a day. A Clark County building inspector granted the exemption--despite the opposition of fire marshals--reasoning that a fire would be quickly noticed by occupants and contained with portable fire extinguishers. When the fire broke out in The Deli restaurant it was no longer open 24 hours per day; in fact it was closed and unoccupied.
Aftermath
The hotel was repaired and improved, including the addition of fire sprinklers and an automatic fire alarm system throughout the property. The hotel was sold to Bally's Entertainment, which changed the name to Bally's Las Vegas. Similar upgrades were also made to the nearly identical property (now the Grand Sierra Resort) in Reno, Nevada. The tower in which 61 of the 85 people who died as a result of the fire is still operating as part of the hotel today. A second tower, unaffected by the fire, opened in 1981. The present MGM Grand hotel-casino was built to the south, near the northeast corner of Las Vegas Boulevard and Tropicana Avenue.
On February 10, 1981, just 90 days after the MGM fire, another fire broke out at the Las Vegas Hilton, killing at least five people. Because of the two incidents, there was a major reformation of fire safety guidelines and codes.
Source of the article : Wikipedia
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