Incident Report

1906-08-06An O2 clean regulator was placed on a cylinder containing 40% nitrox at 250 bar and left standing out of the water at an ambient temperature of around 15 Celsius. About 10 minutes later the middle of the hose exploded spraying burning plastic around. The regulator had previously been used for O2 enriched dives on tens of occasions. When the gauge was removed from the remains of the hose it was found to be leaking back into the hose. It is unclear whether the Bourdon tune was rupture before the explosion or ruptured by the explosion. The root case of the incident is unknown. A full report is given in CDG NL128:4.Treat any O2 enriched mixture with caution.