DETECTION
One of the simplest leak detectors for thermal fluid
is the smoke that shows up when the hot fluid is exposed to air. The
amount of smoke depends on the size of the leak, the temperature of
the fluid and to some extent the airflow in the area. Small leaks
known as “oozers” can produce an exaggerated amount of smoke because
there isn’t enough fluid to form a drop. This steady weeping smokes
and then cooks onto the metal near the leak.
With larger leaks, the fluid usually cools quickly as it drips
or sprays into the air. Since smoke is actually the reaction of the
fluid's volatile low boiling portions (smaller molecules) with oxygen
in the air, this cooling reduces the vaporization of fluid which helps
lessen the amount of smoke. However, if the leak is large enough that
it uses up all the fresh air -- or if ventilation is insufficient -- vapor can
accumulate and cause a potential fire hazard.
The key to preventing safety problems from leaks is to make sure
thermal fluid systems are not operated in enclosed areas without
adequate ventilation. Ensure adequate fresh air flow in any
location (valves, flanges, instrument ports, pumps, expansion tanks,
for example) where the potential exists for a significant leak.
Next month's tip –- THERMAL FLUID LEAKAGE -- Part 2 of 3; HOW TO MINIMIZE LEAKS,
will cover maintenance recommendations for dealing with and preventing leaks. And
watch for THERMAL FLUID LEAKAGE –- Part 3 of 3; FLASH POINT, FIRE POINT, AND AUTOIGNITION
TEMPERATURE DEMYSTIFIED in February. Also in February, TipSheet will offer a
comprehensive THERMAL FLUID LEAKAGE technical data sheet, combining the
information of these three TipSheets, and more. Can't wait? Call us at
800-222-3611, or email info@paratherm.com
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