Soot Damage From Gas Logs

Although it has been several years since we’ve seen sooting damage from a set of gas logs, it still occurs. The main problem is that soot is created when a fuel such as natural gas or propane is burned incompletely.  That is, there is a lack of air mixed with the gas and as a result, carbon is not completely burned.  The excess carbon then appears as soot on solid surfaces.  Appliances, like gas logs units, that advertise the appearance of a realistic wood fire tend to burn with a yellow flame.  The yellow flame is an indication that the fuel is not burned completely.  Some older readers might remember when gas appliances, including log sets, were made to burn with a blue flame.  A blue flame indicated that your appliance was operating as efficiently as possible.  When the flame turned yellow, this was owner’s cue to have the appliance checked.  This is no longer true and hasn’t been true for at least 30 years.  As a result, homeowners don’t have any warning as to when their appliances need attention.  Many of the log sets made today come equipped with what is known as an oxygen depletion sensor.  The device is supposed to shut the log set off if the oxygen in the space drops to a point below what is required to operate the set.  In reality, soot can be produced before the oxygen level drops to an unacceptable level.  This is because the sensor does not sense oxygen, it senses heat from the pilot.  As long as the pilot is producing a flame and the sensor is detecting the heat, the main gas valve will remain open.

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About rjhillconsulting
R.J. Hill Consulting is a forensic consulting engineering firm that specializes in performing failure investigations for attorneys and insurance companies. Mr. R.J. Hill is a registered professional (mechanical) engineer with over 37 years of experience, 33 years in private practice. Please visit www.rjhill.com to see the kinds of forensic investigations that Mr. Hill performs.

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