Guidelines for the Investigation of Grain Dust Explosions (1983) / Chapter Skim
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Appendix: Investigations
Appendix: Investigations
Pages 17-32
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From page 17... ...
1 An explosion occurred at a concrete inland terminal elevator of medium size. There were truck dump and loading facilities and rail dump and rail loading facilities.
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From page 18... ...
Adjacent to the work floor the rail loading and dumping area showed fire damage but only alight blast damage. The two truck dumps showed evidence of fire and blast damage.
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From page 19... ...
As the scale was continuing to dump the surge that was ignited by the electrical arc, an explosion occurred in the loadout bin and propagated into the adjoining house bins and the bin floor area through the destruction of the bin walls and tops. The explosion was able to go out the loadout spout to the car.
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From page 20... ...
Regulatory agencies have listed the tramp metal in the boot pit as the cause of this explosion. All reasonable efforts should be made to keep this foreign material out of the elevator equipment by the use of properly sized gratings on all dumps and the use of magnets on bucket elevator feeds.
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From page 21... ...
2 An explosion occurred at a large wooden country elevator. There were rail loading and truck dump and truck loading facilities.
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From page 22... ...
The application of the fog water stream dispersed the burning and unburned dust into the air and an explosion occurred. This partially vented into the work floor area but also traveled up the two bucket elevators to the top of the headhouse, into the two galleries, and down the one tunnel.
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From page 23... ...
There were rail loading and truck dump and truck loading facilities, the latter of the drive-through type. A wooden flat storage shed and an office building were located near the elevator mill building.
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From page 24... ...
The wooden bin floor surrounded the metal leg casing. The fire surrounding this casing caused the bucket elevator belt to catch fire and burn through.
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From page 25... ...
4 An explosion occurred at a country elevator of medium size with an associated mill. The elevator was of concrete construction.
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From page 26... ...
The lagging in the head pulley was only partially intact showing signs of being burned off. Scenario The bucket elevator was jammed either because of the mechanical damage that had been previously done to it or because of a choke brought about by the clogging of the screener.
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From page 27... ...
At the time of the first visit the bucket elevator belt and the head pulley were not accessible. During return visits it was also possible to visit with injured personnel who were not initially available because of hospitalization.
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From page 28... ...
The fire damage seemed to engulf the truck; however, the blast and missile damage was the worst on the side toward the bucket elevators. The truck dump area showed a uniform scorching due to fire.
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From page 29... ...
An elevator employee was in the control room, and another at the scales whose controls were located in the wooden storage shed. Scenario The metal cups rubbing the metal leg casing near the head pulley caused either a hot spot or sparks and this leg exploded.
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From page 30... ...
Severe damage occurred to the elevator control room, the' penthouse that covered the interior legwell, and the truck that was locatedon the truck dump. Moderate damage occurred to all leg casings and the flat storage shed.
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From page 31... ...
The ends of the belt were badly burned and the head pulley lagging was partially missing and showed evidence of combustion. The outside unloading leg exploded causing the metal casing panels to separate at the corners.
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From page 32... ...
If an explosion comes down from the bucket elevator feed, it can usually get into each bin. The truck dump is an effective large high-pressure vent for the basement areas.
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