FREE UK SHIPPING ON PURCHASES OVER £50 ** 0% FINANCE ON ORDERS OVER £500 ** NEXT DAY DELIVERY AVAILABLE

Low Pressure Hose Deterioration

August 05, 2016

DAN has learned of at least 8 or more recent cases of failure in regulators arising from the build-up of crystals in the second stage hose, where these are constructed using a polymer-braided structure. They intend to publish a more in depth account of this in the Alert Diver Magazine, written by Francois Burman, a professional engineer on the DAN staff, but this safety-related issue needs to be brought to the more urgent attention of both divers and diving equipment service providers. 
The following notice has been extracted from the full article:
  • ​All regulator hoses, including braided hoses, have a limited service-life – irrespective of the external appearance, or the reinforcement and protection provided by hose protectors or the braiding itself. Prior to 2010, the stated service life of 5 years or 500 dives for braided hoses appears to be inaccurate; failures have occurred in hoses with less than 4 years of in-service life. After this date, the manufacturers appear to have made satisfactory changes.
  • The inside lining of all hoses appears to be uniquely prone to degradation in the form of 'crystallisation’, especially in hot, tropical locations. This is a gradual process, reportedly especially active in the range of 27° - 32°C, but the disruption of gas-flow and regulator function is unpredictable and invisible to external inspection.
  •  Any sign of gas-flow restriction in the regulator assembly should prompt careful inspection of the regulator and the hose. If the regulator is not the cause, suspect the hose.
  • A physical examination including squeezing the hose every couple of inches to assess whether the hoses exhibits the same degree of flex should indicate if all is well. Any indication of a change in the resistance.

 

Remember if in doubt have your regulator serviced by a certified technician.



Also in Mike's London Dive Store Blog

Best Scuba Diving Mask 2019
Best Scuba Diving Mask 2019

November 06, 2019

We take a look at the best scuba diving masks in 2019
Read More
Suunto D4i Novo Copper Dive Computer
Suunto D4i Novo Copper Dive Computer

October 04, 2019

The Suunto D4i Novo Copper is one of our favourite computers and also our most popular.
Read More
How To Care For A Wetsuit
How To Care For A Wetsuit

September 10, 2019

A wetsuit is an investment. Take care of it and it will last for years
Read More
Back to the top