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Thermally Induced Stresses in Explosion-proof Electrical Enclosures With Windows. Part 2. Final Technical Report.

Authors
Stewart-SE; Lin-FD; Cox-PA
Source
MISSING :119 pages
Link
NIOSHTIC No.
10005167
Abstract
This report presents the solutions to linear transient thermal and stress analyses of explosion-proof enclosures used in underground mines. The results were used to assess the severity of certification tests for enclosure windows relative to possible loads occurring in the actual mine environment. Cast iron electric light enclosures with polycarbonate and glass windows were analyzed under steady-state thermal conditions (light burning) and for thermal shocks corresponding to an internal explosion (ignition of volatile mine gas) or external quenching (mine water spray system). Thermal shocks to the enclosure, caused by ignited gases or water spray, were applied via a series of load steps in the transient analysis. The temperature dependence of material properties and of the film heat transfer coefficients were included in the model. The work demonstrates that thermally induced stresses are strongly influenced by the way the window is mounted in the enclosure. It also shows that the MSHA thermal shock tests, if performed on an unsupported lens (or window), produces lower stresses than the lens (or window) may experience in the mine environment.
Publication Date
19840101
Document Type
CP; Final Contract Report;
Fiscal Year
1984
NTIS Accession No.
NTIS Price
Identifying No.
OFR 47B-86
NIOSH Division
PRC;
Source Name
MISSING
Performing Organization
Southwest Research Instit.
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