Balloon fireball injures 140 in Armenia: More than 140 people have been injured after gas-filled balloons exploded at a concert in the Armenian capital ahead of parliamentary polls, officials say.
"The balloons exploded and caught fire after people holding the bunches released them from their hands into the air," a witness told AFP.
From the witness statement, it can be said that the friction between balloons in the bunch while going up could have caused this. As hydrogen can easily diffuse through rubber, it could have caught fire from the friction as the ignition energy for hydrogen is as low as 0.0017 mJ and this could have resulted in bursting of balloons and fireball. One may recall the famous Hindenburg disaster in 1937. Only the quantity of flammable substance differs but reason can be same, that of static charge generated due to friction.
Such incidents were also reported at several places. In an incident, the hydrogen balloons burst in the hands of children who suffered burn injuries.
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Showing posts with label static electricity. Show all posts
Showing posts with label static electricity. Show all posts
May 13, 2012
Feb 5, 2011
Fire during solvent transfer in buckets from drums
2-3 days back, I read a news item in a regional news paper that there was fire while transferring a solvent with a plastic bucket from drums. There were sparks followed by big fire.
It is clearly due to static charge builtup during dipping of plastic bucket in drums containing solvent. Static charge is generated due to friction between conducting (metal drum) and non-conducting (solvent, bucket) media. For solvent transfer, one should provide proper piping arrangement with earthing and bonding to dissipate the charge accumulated.
Few years back, I read a case study in which a fire occurred while transferring the solvent through braided plastic hose. Investigation revealed that the electrical continuiity was broken as there was no contact between the nozzle and the metal braid reinforcement to the hose. During transfer for extended time, the accumulated charge on the hose discharged as spark causing fire.
Hence, earthing and bonding are important aspects and one should avoid short term measures like bucket transfer to avoid recurrence of such fire incidents. Further, the operators should not wear synthetic dress (wear only cotton dress), wear antistatic foot wear, ensure turbulence, nozzle spray, etc to avoid static charge generation/accumulation.
It is clearly due to static charge builtup during dipping of plastic bucket in drums containing solvent. Static charge is generated due to friction between conducting (metal drum) and non-conducting (solvent, bucket) media. For solvent transfer, one should provide proper piping arrangement with earthing and bonding to dissipate the charge accumulated.
Few years back, I read a case study in which a fire occurred while transferring the solvent through braided plastic hose. Investigation revealed that the electrical continuiity was broken as there was no contact between the nozzle and the metal braid reinforcement to the hose. During transfer for extended time, the accumulated charge on the hose discharged as spark causing fire.
Hence, earthing and bonding are important aspects and one should avoid short term measures like bucket transfer to avoid recurrence of such fire incidents. Further, the operators should not wear synthetic dress (wear only cotton dress), wear antistatic foot wear, ensure turbulence, nozzle spray, etc to avoid static charge generation/accumulation.
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