Table

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

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