Oxygen safety in the production of enriched air nitrox breathing mixtures.

Rubicon Research Repository/Manakin Repository

Oxygen safety in the production of enriched air nitrox breathing mixtures.

Show full item record


Title: Oxygen safety in the production of enriched air nitrox breathing mixtures.
Author: Butler, GL; Mastro, SJ; Hulbert, AW; Hamilton Jr, RW
Abstract: The practice of enriched air ("NITROX") diving is expanding, and new systems are coming on line to produce the breathing mixtures. Enriched air diving involves use of gas mixtures in which some of the nitrogen in air is replaced with oxygen; the advantage is a reduced decompression obligation. Methods of acquiring enriched air mixtures include a continuous process developed by NOAA whereby oxygen is added to the input air stream of an oil-free compressor, mixing in the tank or a storage vessel by partial pressure, or purchasing pre-mixed gas from industrial gas suppliers. For safe mixing, air to be mixed with oxygen must be free of all liquid hydrocarbons. This is possible but difficult using an oil-lubricated compressor because filtration has to be of adequate design and well maintained; this process is not recommended because of the rigorous maintenance requirements. Oil-less or oil-free compressors are best for producing oil-free air; air meeting many breathing gas purity requirements may nevertheless have too much oil for mixing with 100% oxygen at high pressure. Using pure oxygen and nitrogen is not recommended because of the possibility of breathing pure nitrogen. The recommended way of acquiring enriched air mixes for small operations is to purchase prepared mixtures and pump them into scuba tanks using an oxygen-compatible booster pump. Diving equipment used with enriched air should be clean and lubricated with oxygen-compatible lubricant, but need not have special components if it has no possibility of coming in contact with high pressure oxygen; such equipment should be dedicated to that service and so labelled.
Description: American Academy of Underwater Sciences (http://www.aaus.org/)
URI: http://archive.rubicon-foundation.org/9033
Date: 1992

Files in this item

Files Size Format View
AAUS_1992_5.pdf 7.072Mb PDF View/Open

This item appears in the following Collection(s)

Show full item record

Browse

My Account