Guidelines for the Investigation of Grain Dust Explosions Report (1983) / Chapter Skim
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APPENDIX: INVESTIGATIONS
APPENDIX: INVESTIGATIONS
Pages 17-35
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From page 17... ...
The rail dump and loading areas were alongside the headhouse on two lines; the inside line served the dump pits. There was a large drier between the headhouse and one silo complex with two bucket elevators.
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From page 18... ...
The dust collection systems adjacent to the headhouse showed slight explosion damage. In the one silo complex severe explosion damage occurred to the catwalk connecting it to the headhouse, the gallery at the far end of the tunnel, and a small group of silos centered around an airshaft approximately one-third of the way along the gallery.
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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... ...
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. Regular cleaning of the boot pit will catch any foreign material that escaped the other collection system.
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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... ...
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... ...
3 A fire and explosion occurred at a small country elevator and mill combined in the same wooden structure. There were rail loading and truck dump and truck loading facilities, the latter of the drive-through type.
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From page 24... ...
The light fixture became hot enough to ignite layered dust and this in turn fell onto the dust layer on the floor and ignited it. The wooden bin floor surrounded the metal leg casing.
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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... ...
Fire, blast, and missiles moderately damaged the hopper-bottom trailer that was standing on the truck dump. The fire damage seemed to engulf the truck; however, the blast and missile damage was the worst on the side toward the bucket elevators.
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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... ...
A significant explosion occurred in the basement of the elevator and the escape of these high pressure gases caused the severe damage. Fart of the gases went up the center of the circle of tanks where the outloading bucket elevator and the manlift were located.
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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 area.
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From page 33... ...
17o. Descriptors Grain-handling facilities Grain dust Dust explosions Ignition sources Explosion investigation methodology 17b.
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