High-Pressure Hoses
by Francois Burman
This article represents the views of the author. The article has not been fact checked by myself, the Board of Directors or any member of the USA Dive Club.
Copyright Disclaimer under section 107 of the Copyright Act of 1976, allowance is made for “fair use” for purposes such as criticism, comment, news reporting, teaching, scholarship, education and research. Fair use is a use permitted by copyright statute that might otherwise be infringing.
A lurking peril
PEOPLE WHO HAVE FILLED scuba cylinders, refilled oxygen cylinders, or boosted a gas mix are familiar with using flexible hoses. Some hoses are covered with a durable rubber or thermoplastic jacket, while others appear even sturdier with a braided stainless-steel mesh on the outside. Correctly specified hoses are rated to pressures of up to 6,000 psi (414 bar).
When we first learn the basics of high pressures in hoses and cylinders, we are aware of the potential for serious injury to ourselves and those around us. If hoses fail, the results can be ear-shattering sounds, parts as projectiles, or an escaping gas stream that is strong enough to take out an eye. Without suitable restraints, hoses can whip around with sufficient force to amputate a limb.
Complacency often takes over in most cases, as hoses are sturdy and designed to be handled frequently and subjected to all kinds of abuses. But the risks never diminish, only our perception of risks.
The keys to hose safety are regular inspection, competent use, and replacement according to the manufacturer’s guidelines. Hose replacement is necessary with regular use and should occur more frequently with high usage or in humid areas where metals corrode easily.
The DAN Risk Assessment Guide for Dive Operators and Dive Professionals, which is available as a free download on DAN.org, contains a series of recommendations to address these risks. This information relates to selecting materials and manufacture, hose installation and use, and inspection and maintenance.
Please use the link below for the full DAN article.
High-Pressure Hoses - Divers Alert Network (dan.org)
