26.H Caissons.
26.H.01 In caisson work in which compressed air is used and the working chamber is less than 11 ft (3.3 m) in length, whenever such caissons are at any time suspended or hung while work is in progress so that the bottom of the excavation is more than 9 ft (2.7 m) below the deck of the working chamber, a shield must be erected for the protection of the workers.
Caissons and Drilling.
26.H.02 Shafts must be subjected to a hydrostatic test, at which pressure they must be tight. The shaft must be stamped on the outside shell about 12 in (30.4 cm) from each flange to show the safe working pressure.
26.H.03 Whenever a shaft is used, it must be provided, where space permits, with a safe, proper, and suitable staircase for its entire length, including landing platforms (not more than 20 ft (6 m) apart). Where this is impractical, ladders not more than 20 ft (6 m) high must be installed with each section offset from adjacent sections and a guarded landing provided at each offset.
26.H.04 All caissons having a diameter or side greater than 10 ft (3 m) must be provided with a man lock and shaft for the exclusive use of employees.
26.H.05 In addition to gauges in the locks, an accurate gauge must be maintained on the outer and inner side of each bulkhead. These gauges must be accessible at all times and kept in accurate working order.
26.H.06 In caisson operations where employees are exposed to compressed air working environments, the requirements of Section 26.I must be complied with.
26.I Compressed Air Work.
26.I.01 All safety requirements for compressed air work will be carefully detailed in a Compressed Air Work Plan that must be included as a part of the Accident Prevention Plan or AHA.
26.I.02 The Compressed Air Work Plan must include the following considerations:
- Requirements for a medical lock and its operation;
- An identification system for compressed air workers;
- Communications system requirements;
- Requirements for signs and recordkeeping;
- Special compression and decompression requirements;
- Man lock and decompression chamber requirements;
- Requirements for compressor systems and air supply;
- Ventilation requirements;
- Electrical power requirements;
- Sanitation considerations;
- Fire prevention and fire protection considerations, and l. Requirements for bulkheads and safety screens.
26.I.03 Work in compressed air environments must be performed in compliance with the requirements of 29 CFR 1926.803.
Knowledge Check Choose the best answer for the question.
26-12. All caissons having a diameter or side greater than _____ must be provided with a man lock and shaft for the exclusive use of employees.
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