The current HSE Standards for breathing air
for use by sport divers are EN12021.
The following table gives the maximum allowable
levels of contamintion.
| Contaminant |
Maximum allowable to BS EN12021 |
| Oxygen content |
(21 ±1)% by volume (dry air). |
| Carbon Monoxide content |
shall be as low as
possible but not exceed 15 ml.m-3 (15 ppm). |
| Carbon Dioxide content |
shall not exceed 500 ml.m-3
(500 ppm). |
| Lubricant content (droplets or mist) |
shall not
exceed 0.5 mg.m-3. |
| Water |
There shall be no free liquid water.
The maximum water content of the air
measured at:
- a compressor system outlet for filling cylinders,
should not exceed 25 mg.m-3;
- a cylinder outlet, cylinder pressure from 40 to
200 bar, should not exceed 50 mg.m-3;
- a cylinder outlet, cylinder pressure >200 bar,
should not exceed 35 mg.m-3.
|
| Other Contaminants |
5ppm |
| Odour and Taste |
The air shall be without significant odour or taste. |
| Clenliness |
No dust, dirt, metallic particles, toxic or irritatating
ingredients |
Air testing should be done approximately
every three months.
