CSA Z275.2-15 Occupational Safety Code for Diving Operations
The testing package for CSA Z275.2-15 compliance applies to all types of work and employment conducted as part of occupational diving operations. This package provides analysis for the use of air in various situations such as: SCUBA diving systems, surface supply diving systems, deep diving systems, one-atmosphere diving systems and diving in contaminated environments.
This standard prescribes that a sample of compressed breathing air produced and delivered by a compressed breathing air system for divers should be collected and analysed at least once every 6 months.
Allowable concentrations of components for compressed breathing air:
- Oxygen level: 20–22% by volume
- Nitrogen and Rare Gases levels: 78–80% by volume
- Carbon monoxide level: not more than 3 ppm
- Carbon dioxide level: not more than 600 ppm
- Methane level: not more than 10 ppm
- Volatile non-methane hydrocarbons levels: not more than 5 ppm (as methane equivalent)
- Volatile halogenated hydrocarbons levels: not more than 5 ppm
- Oil, particulates and condensates: not more than 1 mg/m³
- For low pressure systems (< 2216 psig ), the pressure dew point is to be at least 5°C under the lowest temperature to which any part of the pipeline or respirator is exposed to at any time of year.
- For high pressure systems (equal to or greater than 2216 psig) the atmospheric dew point must not exceed – 53°C or water vapour level not more than 27 ppm (by volume) and the pressure dew point is to be at least 5°C under the lowest anticipated operating temperature at any time of year.
- Odour: No pronounced odour