Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Influence of environmental factors on spark ignition probability.

Authors
Peterson-JS
Source
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9566, 1995 Jan; :1-11
Link
NIOSHTIC No.
20039281
Abstract
In past years, the U.S. Bureau of Mines has been involved in safety research that could ultimately relate the conditions of spark testing and actual use by estimating the simple ignition probability of a circuit in question. A major problem in estimating this probability is that results show a significant variability, even though gas mixtures and electrical parameters may be closely controlled. Some researchers have suggested that the ambient environmental conditions of the testing may influence the results. A series of tests were conducted using a Spark Test Apparatus to simulate a falling electrical circuit. By independently adjusting the temperature, pressure, or relative humidity of the combustible gas mixture, multiple test environments were examined. At each ignition, a computer recorded the temperature, pressure, and relative humidity of the gas immediately prior to the explosion. These data were then used to establish the effect of the test environment on the ignition probability and to create a mathematical model of the test environment's synergistic effects. The analysis indicated that these effects were not as significant as previously expected. No general algorithm was found that could be used to predict these effects across the range of circuits tested.
Keywords
Ignition-current; Explosions; Probability; Test-facilities; Mathematical-models; Electric-circuits; Electric-sparks; Spark-ignition; Safety-engineering; Electrodes; Mine-fixes; Electrical-measurement; Electrical-properties; Electrical-systems; Combustible-gases; Mathematical-models
Publication Date
19950101
Document Type
Report of Investigations
Fiscal Year
1995
NTIS Accession No.
PB95-264800
NTIS Price
A03
Identifying No.
RI-9566
NIOSH Division
PRC
Source Name
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9566
State
PA
TOP