Controls present in addition to
Carbon monoxide
Operation
natural ventilation
concentration
in PPM*
Testing and tuning small motor vehicle engines (less than 200 hp) was
None............................................
200-500
performed by three to five employees in a 36,000 cubic-foot room. Two or
three engines were frequently operated simultaneously. It was reported that
the workers suffered repeated headaches during the winter season when all
doors and windows were closed.
Repair and tuning of heavy engineering equipment engines (greater than
Four-inch diameter, gravity
400-800
200 hp) were performed by 20 mechanics in a 38,000 cubic-foot room.
exhaust
tailpipe
extensions
Atmospheric sampling was accomplished when four diesel engines and four
approximately 25 feet in length.
large gasoline engines were operating simultaneously.
Testing and tuning truck, tank, and other large vehicle engines was done in a
a. Mechanical general
100-500
200,000 cubic-foot room. Approximately 19 persons were exposed 2 to 3
ventilation by means of a 48-inch
hours daily.
exhaust fan.
b. Intermittent exposure.
a. Mechanical general
200-800
Dynamometer testing of engines (greater than 500 hp) was performed by
ventilation by means of two ceiling-
seven workers in a 50,000 cubic-foot room. Medical personnel reported that
exhaust fans.
on one occasion four of the workers were overcome by carbon monoxide
b.
Four-inch diameter gravity-
and were brought to the hospital where oxygen was administered. On
exhaust tailpipe extensions.
another occasion a dynamometer test operator was hospitalized for one
week because of carbon monoxide poisoning. Operations in the
dynamometer shop were finally suspended until the ventilation system could
be modified.
*Parts per million parts of air.
TAGO 3152B
3
