03/05/03
Filter Fires!
Hot Surfaces - M/NM Mines
The installation of diesel particulate matter
filters on equipment can increase the risk of fires. Other Best Practices have discussed the hazard
of paper filter element fires on part 36 permissible equipment and the
potential for uncontrolled regeneration (fire) in a ceramic filter. However, another fire hazard can be created
by adding exhaust system components to a machine. Adding exhaust system piping and filter housings increases the
area of the exhaust system thereby increasing the chance it will come in
contact with combustible material.
Exhaust system components may achieve temperatures in excess of 1000°F. This is hot enough to ignite most
combustible materials including potential sprays of hydraulic fluid from broken
hoses. This is also hot enough to
injure workers that may come in contact with these components
Good
housekeeping- spray washing of machines, fixing leaks, keeping machine covers
in place, etc., is necessary to keep machines free of combustible
accumulations.
Flammable or combustible liquid spillage or leakage must be removed
in a timely manner or controlled to prevent a fire hazard, §57.4102.
Non-absorbent
(both inside and outside surfaces) insulating materials applied to hot surfaces
can greatly reduce the fire risk.
Exhaust system insulation should be installed in accordance with the
filter manufacturer’s recommendations.
Guarding of easily contacted exhaust system components may be necessary
to protect personnel.
Since
the addition of uninsulated exhaust piping and filter housings can increase the
fire hazard, a fire risk assessment of the machine should be performed. Changes to the machine’s fire suppression
system, if so equipped, such as additional fire suppression system nozzles or
sensors may be needed. Consult your
fire suppression system manufacturer or their authorized representative.
