Work in compressed air caissons and tunnels

Pages:304-314
33. Work in compressed air caissons and
tunnels
33.1. General provisions
33.1.1. No person should be subjected to a pressure exceeding
3.5 kg/cm2 (50 lb/in2) except in emergencies.
33.1.2. For every shift a record should be kept showing the
time every worker spends in the working chamber and the time
taken for decompression.
Personnel
33.1.3. No person should be employed in compressed air
unless:
he has experience of such work; or
he is under the constant supervision of an experienced person.
33.1.4. No person under 20 years of age should be employed
in compressed air.
33.1.5. When begimiing employment in compressed air every
worker should be given a leaflet setting out the precautionsthat
he should observe before, during and after work.
Medical supervision
33.1.6. No person should be employed in compressed air
unless he has been medically examined and found fit for such
employment.
33.1.7. If the air pressure exceeds 1.25 kg/cm2 (18 lb/in2) the
medical examination should have been made within the four
weeks preceding his employment.
33.1.8. Workers who have been employed continuously in
compressed air at a pressure less than 1.5 kg/cm2 (21 lb/in2)
should be medically re-examined every two months; if the pressure
is higher, the period between re-examinations should be shorter.
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