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Test Procedure - doe-std-1167-20030025
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DOE Standard Respiratory Acceptance Program for Supplied
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Escape Test


DOE-STD-1167-2003
17.1.2 Noise measurements should be conducted with Type I or Type II sound level
meters equipped with omni directional microphones using the A-weighted
network and the slow-response setting. Sound level meters should be
calibrated following the manufacturer's recommendations. Prior to and
immediately after completing sound level testing, the accuracy of sound level
meters should be verified following the manufacturer's recommendations
using a source recommended by the manufacturer. Calibration and accuracy
checks should be incorporated into the test report.
17.1.3 The sound level meter should have the microphone attached using a
manufacturer's recommended extension cable to permit the microphone to be
remote from the display unit.
17.1.4 A device to hold the remote microphone within three inches of either ear of
the suit tester while not affecting the normal operation of the suit should be
used. The device is only required for testing the supplied-air suit noise levels,
and if desired, may be eliminated during other evaluations. The reading on
the Sound Pressure Level Meter can be affected by the diaphragm of the
microphone in the direct airflow path of the inlet air, or if it is incident to the
airflow path. When directly in the path it could result in an artificially high
reading and when at a 90-degree angle to the path (if the velocity is great
enough) it can result in an artificially low reading. Therefore, the test
operator should take care to assure that the microphone is placed near the suit
tester's ear, but not in or incident to the airflow path.
17.1.5 Airflow measuring equipment should be capable of determining the volume
of air entering the supplied-air suit with an accuracy of plus or minus 10
percent. Calibration information should be incorporated into the test report.
17.1.6 Prior to a suit tester donning the supplied-air suit the test operator should
confirm that the noise level inside the helmet is less than 85 dBA and
determine whether noise levels are uniformly distributed within the helmet. If
the helmet noise levels equals or exceeds 85 dBA, testing should not continue
without concurrence from the ERAP administrator. If the noise levels are not
uniformly distributed, the in-helmet microphone should be positioned near
the ear expected to experience the greatest noise. The test operator should
attach the device containing the remote microphone to the suit tester, and
ensure that the microphone is located within three inches of the suit tester's
right or left ear except as noted above. The suit tester should don the
supplied-air suit in accordance with instructions provided by the DOE
contractor.
17.2
Test Procedure
17.2.1 The test operator should measure the background noise in the helmet with no
air flowing into the supplied-air suit. While determining the background
noise, the suit tester should stand still with his arms hanging along his sides
and he should hold his breath. The background noise level should be
recorded. Tests to measure the level of noise generated by the flow of air
20


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