AIR PRESENT or COULD BE
with Combustible Vapors or Gases (Murphy's Law)
FAMOUS LAST WORDS ------> We never have air, our system is purged.
If the system is a sealed pressurized
system without any
atmospheric vent valves or vacuum relieves, such as a
process or refinery flare, and the proper startup and
shutdown purge methods are followed ----> then an
arrestor is usually not used.
However, if the system is connected to
units that are opened to atmosphere for loading or
cleaning -- or -- to low pressure storage tanks with
vacuum relieves -----> air could be present. Arrestor needed.
IMPORTANT to have the correct type of
its service & location.
EXAMPLE -- No Injuries or Fire
--- also an example of ------> Why correct arrestor selection & application is important.
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