Archive for April, 2017

April 14th 2017
SOME’S GOOD, MORE’S BETTER & TOO MUCH IS DANGEROUS!

Posted under Uncategorized

Filling compressed gas cylinders is a serious matter. The Federal Government says that it’s illegal to fill gas cylinders beyond their rated fill pressures. Injuries at the fill station are common. Gas cylinder filling is a Hazmat situation that requires training for any individual who provides pressurized gas fills. Many divers want a “good fill” but what is a good fill? Divers seem to want their cylinders overpressurized meaning more than the cylinder is rated for. Cylinders are engineered & tested to allow for their maximum fill pressures. When cylinders get taken above their engineered max fill pressure things can go wrong. Cylinders will begin to weaken & potentially they will fail their hydrostatic test. It compromises the bust disc causing the burst disc to get bulged & then the burst disc can let go well below its rated burst pressure & at any given time (even U/W!) Most of our more discerning divers bring their cylinders in to fill well in advance so as to allow us to fill nice & slow, allow for cooling then to top up to the final psi while cooled.

No Comments »

April 6th 2017
IF IT’S TOO GOOD TO BE TRUE IT IS!

Posted under Uncategorized

imageWe warned you in this post a year ago about miflex hoses. Now DAN (Divers Alert Network) posted a additional issue with these hoses. They allow for polymorphic crystallization corrosion on the inside constricting & potentially blocking the air flow. Cyclical heating & cooling at oil-water interfaces combined with the molecular structure of the internal tube lining promotes crystallization of these materials allowing growth to accumulate over time & that is just what’s happening inside! The external fiber woven sheath acts like a cheese grater. ┬áThe hose sheath fibers collect sand, soils & vegetation. These hoses fray & the plastic sheath fibers stick out & can stab you! What is wrong with rubber? They are stronger, last longer, flex as much & cost less.

No Comments »