Pin holes in hoses?

[Rick Huggins]

<font color='#0000FF'>

Originally Posted by [b

Quote[/b] ]The holes are designed to allow the release of pressure between the inner and outer hoses when the inner expands under the pressure of the cyclinder. &nbsp;As far as I am aware, this is perfectly normal, as I asked my instructor (who is also a service technician) when I noticed the same thing happening with by brand new regs.

Told you so, told you so

[dave archer]

OK I'm convinced, the hose is knackered, as I suspected, and will be replaced.

But I'm interested (sad git ) - are we saying hoses are built with an inner which can take the high pressure, and an outer which can't but is there just to protect the inner? I'd not really thought about it before and had assumed it was just one layer.

Same design and pin-hole warning mechanism for LP hoses too it would appear?

Ta for your help all,
Dave.

[Skeletor]

Sorry, but I'm still not convinced. &nbsp;
I agree that if air is continually p1ss1*&amp; out of the holes then there is a problem with &nbsp;the inner. &nbsp;But on the occasions that I have &nbsp;noticed it, it has been when the hose is wet and immediately following pressurisation. &nbsp;The venting stops after a few moments and I have never noticed a trail of bubbles in my wake during a dive. As far as I understand it, the inner hose is more flexible than the outer as it is the outer that provides the majority of the mechanical strength. I really think that a fact finding mission to a HP hose manufacturer sponsored by YD is in order (prefferably somewhere warm with good diving).

Following this, &nbsp;if it is upheld that I am wrong, I will respect all demands for an apology.

[dave archer]

John,

If it was a very small venting - hard to notice and over in says 10 seconds - then maybe I could buy the &quot;air between inner/outer venting, normal, no problem&quot; idea. Though I'd still want to know why I've never seen it before.

The venting on mine however was just too much air to be the trapped stuff I think. It didn't stop until about 15 mins had passed and was just too powerfull (i.e. audible and able to feel on finger tips 2cm from hose). Maybe yours is less?

Fully support your idea of a investigative, manufacturer funded trip to clarify - a forntight liveaboard in the Maldives should do it I reckon? &nbsp;

Dave.

[Janos]

I could well be talking crap here, but when did that stop me?

My gauge had a leak from the tiny thingy that sits inside the hose and the guage. Consequently it sometime leaked air, and sometimes didn't, depending on how the guage was rotated.

Could it be a small intermittent leak that's forcing air inbetween the hoses? Or am I talking crap?

Laters,
&nbsp; Janos

[darthmoll]

Originally Posted by [b

Quote[/b] (Janos @ Mar. 26 2004,21:36)]My gauge had a leak from the tiny thingy that sits inside the hose and the guage. Consequently it sometime leaked air, and sometimes didn't, depending on how the guage was rotated.

<font color='#0000FF'>that will be the swivel, replace the two mini orings and it will stop leaking

[Neil R]

I changed a HP hose myself recently, for a brand new shorter one. To start with I decided to use the old swivel. About a week later my conscience got the better of me and I decided to also renew the swivel. On disassembly I was quite staggered to see loads of small metal swarf bunched around the swivel's upstream o ring - which I guess had blown down the HP hose after being left in at manufacture time.

So my tip would be to gently blow out any new HP hose before fitting the swivel / gauage.


h

[Neil R]

Oh and I once spent ages trying to establish the o ring size - I only found the one website with anything at all, and that said '003'. This after a previous experience of seeing a dive shop do a rummage around their o ring box and fitting something which presumably looked about right - which of course didn't last more than about 4 dives. In the end the easier and I daresay more reliable option being just buying a new swivel. Good thing for the spares box anyhow?

[Mark Chase]

About 18months and over 100 dives ago I had bubbls comming from my SPG. The nice man at Gozo Aqua Sports striped it down turned the o rings arround greesed it up with 02 compatable and I have been using it ever since

Mark Chase