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.

304