(820 ILCS 245/3) (from Ch. 48, par. 263)
Sec. 3.
No person employed in compressed air shall be permitted to pass
from the working chamber to normal air, except after decompression in a lock as follows:
(a) Where the air pressure is greater than normal and not more than fifteen
pounds per square inch, the time of decompression shall be at least two minutes;
(b) Where the air pressure is more than fifteen pounds per square inch,
and not more than twenty-six pounds per square inch, decompression shall
be at the average rate of not more than three pounds per minute;
(c) Where the air pressure is more than twenty-six pounds per square inch,
and not more than thirty-three pounds per square inch, decompression shall
be at the average rate of not more than two pounds per minute;
(d) Where the air pressure is more than thirty-three pounds per square
inch, decompression shall be at the average rate of not more than one pound per minute;
(e) Where the air pressure is more than fifteen pounds per square inch,
a stage decompression shall be used in which a drop of one-half of the maximum
gauge pressure shall be at the rate of five pounds per minute. The remaining
decompression shall be at a uniform rate and the total time of decompression
shall equal the time specified for the original maximum pressure;
(f) The time of decompression shall be posted in each man lock.
(Source: Laws 1939, p. 614.)
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