Journal of Japan Society for Safety Engineering
Online ISSN : 2424-0656
Print ISSN : 0570-4480
ISSN-L : 0570-4480
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Volume 43, Issue 4
JOURNAL OF JAPAN SOCIETY FOR SAFETY ENGINEERING_2004_4
Displaying 1-13 of 13 articles from this issue
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REVIEW
ORIGINAL PAPER
  • Electrostatic Hazards Associated with Spraying, Featuring Spray Cans Used for Nondestructive Examination
    Mizuki Yamaguma
    2004 Volume 43 Issue 4 Pages 229-237
    Published: August 15, 2004
    Released on J-STAGE: December 30, 2016
    DOIhttps://doi.org/10.18943/safety.43.4_229
    JOURNAL FREE ACCESS
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    As an investigation of the cause of an explosion and fire that occurred during spraying with hand-held spray cans used for a nondestructive examination called the liquid-penetrant testing (PT), currents and static charges released as a result of spraying were measured. The charge generation was greatly affected by the polarity of the liquid materials, the solid fine particles suspended in the solution, the bore of the nozzle, and the temperature. One of the PT spraycans containing fine silica powder produced current and charge above 50 nA and 30 μC／kg, respectively, at a high temperature. Such levels are quite dangerous when an operator is not grounded. When two popular propellents, liquefied petroleum gas (LPG) and dimethyl ether (DME), were compared, DME generated a charge that was considerably higher than that generated by LPG. This was probably because DME is a polar compound that enables many ions to dissolve into it. By slightly enlarging the bore of the nozzle, the charge was drastically reduced, which suggests that an antistatic version of a spray can could be devised with a minor modification of the current nozzle.

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TOPICS
TECHNICAL REPORT
ACCIDENT ANALYSIS
RESEACH INSTITUTE
SALOON
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