Incident Report

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Incident Report 2020-05-01T16:26:00+00:00

Draeger-Normalair Jammed Tap

Incident Date

1907-06-05

Incident Description

1977 - A trainee found that hie bottle tap had jammed solid in the off position. Later when stripped it was found that the spindle head had broken up. This is an exaggerated example of the commonest fault of the Draeger-Normalair tap. When turned off too hard the nylon washer on the spindle head is forced into its brass setting which cracks up leading to a downstream leak.

Lessons Learned

Bottles should never be turned off too hard. If they develop a downstream leak the spindle heads needs renewing.
Factors
Line Management Negligible
Gas Management Negligible
Equipment Management Minor
Equipment Failure Major
Training Minor
Medical Negligible
Planning Negligible
Procedural Error Negligible
Cave Environment Negligible
Weather Negligible
Other Factor Unknown