What are the oxygen considerations as regards equipment and nitrox?
There are a number of viewpoints. In industrial situations any hyperoxic gas mix may be treated as pure oxygen, others suggest that 23.5% oxygen is the limit. For scuba purposes it is generally recommended that any mix with greater than 50% oxygen is treated as pure oxygen and that any equipment which may be exposed to a mixture with greater than 40% oxygen is made oxygen clean (see question [16]) prior to use. The equipment should also be oxygen compatible (see question [17]). When considering which pieces of equipment may be exposed to high percentages of oxygen remember that pure oxygen may be pumped into your cylinder during nitrox fills. Thus cylinders, pillar valves and hoses used for gas transfer should all be prepared for oxygen service (see question [18]). Regulators and ancillary equipment which may come into contact with the mixture from the cylinder should be prepared to work with the percentage of oxygen in the final mix. For mixes with less than 40% oxygen it is not regar
