High pressure hose blowing, can it happen UW?

[SteveAD]

as for the folks who claim the hp air rushing out will amputate fingers, haven't you ever opened a tank valve and put you hand in front of it? that is full pressure on an unrestricted orifice. I have never even heard about a guy who knows a guy whos brother got a finger cut by hp air.
trauma from a flailing hose maybe, but cut by air? not at the pressures we're talking about.

 

[DA Aquamaster]

The original post two years ago stated:

"On my second ocean dive earlier this year in Mexico, our dive leader back rolled off the boat and came up to find his high pressure hose had ruptured."

I suspect the dive leader caught his SPG on something when back rolling out of the boat and the strain on the hose caused a separation in one or more of the layers of the hose resulting in the leak.

They just do not suddenly start leaking without some provocation and to suddenly get a big leak, you have to abuse the hose.

In my 20 plus years of diving experience, HP hoses start to develop pin hole leaks with very slow streams of bubbles which over the course of a few to several dives increases to multiple pin hole leaks with a fizzy aquarium airstone effect.

Alternatively, if the outer covering is intact the pin hole leak in the inner membrane will cause the outer covering to swell until something starts to leak.

The third common failure is a leak where the hose has begun to crack or weather check due to being too tightly bent over time and again begins leaking fairly slowly.

So basically, you will catch all of the most common failures in the incipent or very minor stages of the process where the leaks are very small and not usually noticed until you see small streams of tiny bubbles oozing from them.

 

[Packhorse]

as for the folks who claim the hp air rushing out will amputate fingers, haven't you ever opened a tank valve and put you hand in front of it? that is full pressure on an unrestricted orifice. I have never even heard about a guy who knows a guy whos brother got a finger cut by hp air.
trauma from a flailing hose maybe, but cut by air? not at the pressures we're talking about.

Ok then try this.
place your thumb over the opening on the valve. using your other hand fully open the valve.
Hows your thumb feeling now?
It may not be cut off but im sure it hurts.

 

[Hank49]

One time after I serviced my ex wife's reg, I hooked it to a tank, opened the valve and in a few seconds, a bubble began to form on the HP hose.....it got about the size of a large marble and in about 5 seconds, POW !!!!!. It was the hose that came with the Seaquest BCD.

 

[del_mo]

Boy, I should count my lucky stars. On a recent boat dive, after hooking up my rig, I turned on the air to make sure I had air. I heard the rush of air as the system charged and then the rush sound not only continued but got louder. I leaned over to place my ear near the first stage to see if the leak was an o-ring. My head was no more than a foot from the first stage when my lp hose blew, from under the metal sleeve. No injuries. For the record, the hose was less than 2 yrs old, 90 dives and was "serviced" last October.

Let that be a lesson.

 

[Hank49]

It was the hose that came with the Seaquest BCD.

Oops, my mistake. that would have been a low pressure that came with the bcd. It was the high pressure that blew though.

 

[Bluey]

tests conducted in the June/July issue of "dive New Zealand" mag:

Tests conducted at 100 feet.

Draining a full 80 cubic ft, 3000psi tank:
High pressure hose failure - 22 minutes
Low pressure hose failure - 81 seconds
Failed burst disc - 74 seconds
Second stage free flow - 115 seconds

Bluey

 

[Gary D.]

That's what I was looking for. I can find crap under some unreal conditions but I can't find a flippin thread on a computer sitting in an office. :shakehead

Thanks a bunch

Gary D.

 

[101kreasons]

I have a two year old suunto high pressure hose that leaks air out of tiny pin holes. They tell me that's normal and will go away. Is that true?

 

[TSandM]

No . . . If the hose is leaking along its length out of tiny pinholes, it's failing, and needs to be replaced.