Personnel in the hearing conservation program
should receive 1 hour of training on the program before
they go to work, and annually thereafter. The training
should include the following topics:
The elements and rationale for the program
Designated noise hazardous areas and equipment
Proper use and maintenance of hearing
protective devices, including the advantages and
disadvantages of each type
The necessity for periodic hearing testing
Off-duty hearing conservation
The effects of hearing loss on career longevity,
promotion, and retention
The incidence of hearing loss within the
individuals work spaces
Noise measurement data, including audiometric
records and information in a persons health record
should be retained as required by current directives. The
following specific records should be kept:
The MDR should record the results of hearing tests
and exposure assessments in each persons health
record. This includes reference audiograms,
evaluations, dispositions, and referrals. Reference
hearing tests should be recorded on form DD 2215 and
monitoring tests on form DD 2216. Individual exposure
level data should be recorded on the DD 2215 or DD
2216 in the Location-Place of Work section. The first
copy of each of these forms should be sent to
NAVENVIRHLTHCEN. The second copy should be
kept for local use and may be destroyed when no longer
The MDR should keep a roster of personnel who
routinely work in noise hazardous areas and update it as
needed and at least annually. The MDR should use this
tickler file to schedule annual audiometric examinations
of these personnel.
THE HEAT STRESS PROGRAM
Heat stress is caused by certain combinations of air
temperature, thermal radiation, humidity, airflow, and
workload that reduce the bodys ability to adjust. Body
temperature increases cause fatigue, severe headaches,
nausea, and reduced physical and mental performance.
If exposure is prolonged, the bodys temperature may
increase and lead to heat exhaustion or heatstroke. These
injuries can be life threatening if they are not treated
immediately. However, heat exposure occurs gradually,
and the effects are reversible if you follow precautions.
This section will cover the procedures we use to prevent
CONDITIONS LEADING TO HEAT STRESS
Heat stress can occur in most places throughout a
ship. However, the worst conditions are usually found
in areas that generate extra heat, such as machinery
spaces, laundries, sculleries, and steam catapult rooms.
The most common correctable causes of heat stress are
steam and water leaks, boiler air casing leaks, missing
or deteriorated thermal insulation, ventilation systems
defects, and weather conditions of high heat and
humidity. You can help reduce these conditions with
proper maintenance on equipment that contributes to
high heat and humidity.
HEAT STRESS SURVEYS
Heat stress surveys are used to determine stay time,
or how long a person may work at a given watch or work
station before there is danger of heat stress. More
strenuous work reduces stay time. Conduct heat stress
surveys at work or watch stations under any of the
following conditions: (1) when dry-bulb temperature
exceeds 100°F, (2) when heat or moisture is unusually
high, and (3) before engineering casualty control drills.
The next paragraphs describe the basic procedure used
in a heat stress survey; always refer to the instructions
before you begin.
1. First, use a WGBT meter to measure dry bulb,
wet bulb, and globe temperatures at your watch or work
station and convert the readings to a WGBT index.
2. Next, enter the WGBT index on a PHEL chart.
The PHEL chart contains six physiological heat
exposure limits, or PHEL curves, that show the average
stay time in a given work environment before you are
in danger of heat stress, The curves range from light
work (PHEL curve 1) to heavy work (PHEL curve VI).
3. The WGBT index entered on the appropriate
curve on the PHEL chart will give you the maximum
time (stay time) you should remain at your station before