Details:

Personal Author:
Conti, Ronald S. ; Zlochower, Isaac A. ; Sapko, M. J. ;
Conti, Ronald S. ; Zlochower, Isaac A. ; Sapko, M. J. ; Less -
Corporate Authors:
United States. Bureau of Mines. ;
Description:
"The Bureau of Mines has developed a system using a high-speed electropneumatic mechanism for the rapid (grab) sampling of dusts and gases during an explosion. The sampling system consists of an aluminum housing that incorporates two 30-cm3 pre-evacuated glass vials with rubber septums. Upon actuation, the sampling probe needle is driven through the septum with a pressurized air pulse, filling the tube with gas and dust from the mine explosion. After a predetermined time, the sampling probe needle is retracted by a second high-pressure air pulse to its normal (quiescent) state, allowing the sampling tube to reseal. The onset and the duration of sampling are independently variable and controlled by a time-delay relay package. This technique enables the monitoring of pyrolysis-charring in coal particles and the generation and combustion of the pyrolysis vapors in both large- and small-scale explosions. The following results were obtained from full-scale dust explosion tests at the Bureau of Mines Lake Lynn Laboratory: (1) gas sampling of the leading edge of the flame front shows the large concentration changes, characteristic of the flame front; (2) gas samples taken entirely in the flame zone consist of pyrolysis and combustion products with very low residual oxygen; and (3) the particles collected in the flame zone show signs of extensive pyrolysis and charring." - NIOSHTIC-2 NIOSHTIC no. 10006240
Subject:
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Mine Explosions.
Mine Gases -- Measurement.

Document Type:
Report ;
Collection(s):
National Institute for Occupational Safety and Health
Main Document Checksum:
[+]
urn:sha256:aa1d67883690541ad88936639c66488a0a73cbd06353aafa6186a59c2db5778d
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