Hi Dan!
Accepting your observations, does
ASTM E27, have an error calculation to place a range on the number created using the standard for a given substance?
Clearly, I do not have this standard or I'd look it up.
Thanks in advance!
Dr. Bob Haugen
Director of Product and Technology Development
Flow Sciences, Inc.
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It is difficult to experimentally determine the autoignition temp of dusts. The result is highly dependent on particle size and shape, particle loading,
moisture content, etc. I would expect high variability. For a number of years I was on the ASTM E27 committee that handled the auto ignition standard.
Opinion appears to be somewhat divided on the autoignition temperature of sulfur. Fisher Scientific says 232 degrees C.
James A. Kaufman, PhD
Founder/President Emeritus
The Laboratory Safety Institute (LSI)
A Nonprofit Educational Organization for Safety in Science, Industry, and Education
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Learn, and Practice Science Safely
Turns out the reported autoignition temperature for sulfur is as low as
168C. The dust is quite sensitive and hydrocarbon impurities are known
to decrease the autoignition temp.
http://www.sulphuric-acid.com/techmanual/Plant_Safety/safety_sulphur.htm
This is lower than that of red phosphorus at 260C.
https://web.stanford.edu/dept/EHS/cgi-bin/lcst/lcss/lcss72.html
Regards
Dave Lane
Principal
Clavis Technology Development
On 1/26/22 7:45 AM, Monona Rossol wrote:
> At last. My ppt has examples of all kinds of deflagration substances, but I haven't had a good one on sulfur. Monona
> CAUSE DETERMINED OF SULFUR FIRE AT CERES FARM COMPANY
>
https://www.modbee.com/news/local/article257699048.html
> Tags: us_CA, industrial, follow-up, environmental, ag_chems
>
> The source of a hazardous materials fire that prompted a 12-hour shelter in place advisory for some Ceres residents on Monday was determined to be a light bulb.
>
> An employee at Stanislaus Farm Supply on East Service Road was changing a light bulb inside a 40,000-square-foot warehouse that contained a large amount of fertilizer-grade sulfur, said Dustin Bruley, supervisor of the Stanislaus Regional Fire Investigation
Unit.
>
> "In those warehouses they have a lot of dust floating in the air attributed to that product and when you change out a light bulb the simplest spark or static electricity can set off the particulate that floats in the air," Burley said. In this case the particulate
was flammable sulfur.
>
> He said the spark caused flash fire, "The air around it has this matter floating so when it ignites, anything in that room has the potential to ignite as well."
>
> A 500-ton pile of fertilizer sulfur began smoldering. Employees tried to put it out but the fire grew larger than they could handle.
>
>
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