Table 6-1.—Cartridge Color-Coding
thermal insulation, and excessive steam or water
If the computed watch stander or worker stay
leaks produce heat stress conditions. Conduct heat
times are greater than the duration of the watch
stress surveys in your work area at the following
or work periods (normally 4 hours) in which you
times:
conduct heat stress survey, conduct another
When the watch or work station’s dry-bulb
temperature exceeds 100°F
During conditions of unusually high heat
or moisture
Before conducting engineering casualty
drills
During operations in hot, humid climates
During the performance of exceptionally
arduous work
During engineering plant restoration after
actual casualties
survey during the hottest time of the day. If the
computed stay times are greater than the normal
watch or work period at the hottest time of day,
you are required to conduct only two surveys each
day. If the computed stay times are less than the
scheduled duration of watch or work periods, in-
crease the frequency of conducting surveys; con-
duct them at equally spaced intervals a minimum
of once per stay time period at the affected
stations.
To compute heat stress surveys, use a wet bulb
globe temperature index (WBGT) meter. Transfer
the readings to heat stress monitoring report
sheets. Once documented, compute the stay time
by using the six physiological heat exposure limit
(PHEL) curves, ranging from light work (PHEL
CURVE 1) to heavy work (PHE CURVE 6).
6-13
