In a message dated 12/8/2003 9:12:50 AM US Eastern Standard Time,
[log in to unmask] writes:
Thank you for the observation, but I have a question.  I agree that an oven
with an enclosed workspace needs to be the Class A explosion proof variety,
but does this same restriction apply to an IR tunnel where you have air
access on either end of the machine, i.e. not an enclosed work space?
Actually there are two OSHA accepted ways to deal with an oven under these
conditions.  One is to make everything explosion proof.  The other, which I have
used for 10+ years at several installations, is to guarantee enough airflow
through the heated tunnel and out the exhaust to prevent a build up of vapors
sufficient to cause an explosion.  Usually a measured linear airflow of 100
ft/min or higher in every opening (in this case both ends of the oven) will meet
the OSHA requirement and provide a safe operating environment.

Jon Moore

By His grace,
Jon

Stop telling God how big your storm is. Instead tell your storm how big your
GOD is.

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