Hazardous Noise Warning Decal, 8" x 10-1/2", and the NAVMED 6260.2A,
Hazardous Noise Labels (displayed on hand tools), 1" x 1-1/2", are the
approved decals and labels for appropriately marking noise hazardous areas or
equipment."
b.
Acceptable Noise Levels. Few quantitative design guidelines exist
relative to acceptable noise levels in hyperbaric chambers for diver
efficiency and communications. Table 5-13 shows acceptable ranges of sound
levels and an upper limit above which there is marked personnel efficiency
decrease. It is, of course, desirable to maintain sound levels at the lower
end of the range.
The upper part of the range is acceptable for short
periods of time.
TABLE 5-13
Sound Level Considerations in
Small Compartments (5.13)
Suggested Limits of Sound Levels for Hyperbaric Chambers
In Rest Area
In Work Area
Practical
Octave
Lowest
Desirable
Lowest
Desirable
Upper
Band
Practical Maximum Practical Maximum
Limit
38-75
75
85
85
100
105
75-150
65
75
75
95
105
150-300
55
65
65
90
100
300-600
50
60
60
85
95
600-1200
45
55
55
75
85
1200-2400
45
55
55
65
75
2400-4800
45
55
55
60
70
4800-9600
40
50
50
55
65
(1) For exposures of 8 hours or less, the levels established by
OPNAVINST 6260.2 should be complied with.
(2) For exposures exceeding 8 hours per day, as in saturation
diving, an interim allowable noise exposure level has been established by the
Bureau of Medicine and Surgery.
The maximum allowable sound pressure levels (SPL) in decibels (dBa) for
steady-state background noise from environmental control machinery, and for
intermittent peak noise exposure instances not exceeding 15 minutes duration,
are as follows:
(a)
Disregard steady-state noise levels if intensity is 85
dB or less.
(b)
Intermittent Peak Noise (compression, decompression,
and ventilating noises):
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