Pin holes in hoses?

[dave archer]

My HP hose has several rows of what look like pin holes along it, about 5cm apart - what are they?? Some sort of over-pressure safety mechanism to ensure the hose blows rather than knackering the SPG?

It was bubbling from one of these pre-dive recently - was only at 230bar so I assume the hose is knackered and needs replacing?
How much would you expect to pay to get a replacement HP fitted to an SPG?

Noticed the same holes on LP hoses on some of our club regs too - I'm confused....  

Dave.

[Rick Huggins]

<font color='#0000FF'>Dave,

from my understanding this is an early warning that the hose is about to rupture. These holes are designed to release air when the inner tube begins to deteriorate, so replacing your hose was a wise choice.

HTH

Rick

[Skeletor]

Dave,

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.

John

[Rick Huggins]

<font color='#0000FF'>

Originally Posted by [b

Quote[/b] ]Dave,

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.

John

John, this would suggest that your hoses would always trickle air?

Sorry, but this can't be the case IMO!

The guy who told me was also a service technician, so can anyone else bring some cream to the bun fight &nbsp;

[tom]

Rick, I interpreted that as meaning that there was a (small, obviously) airspace between the inner and outer  hoses. Not air coming out of the inner hose. If this is the case, then you'd expect to see it on every dive I guess?

EDIT: if there was a continuous release of air throughout the dive, not just at the start, then that would indicate a leak from the inner hose - so maybe BOTH of you are right, depending on the point in time at which this is happening?

[Rick Huggins]

<font color='#0000FF'>

Originally Posted by [b

Quote[/b] ]Rick, I interpreted that as meaning that there was a (small, obviously) airspace between the inner and outer &nbsp;hoses. Not air coming out of the inner hose. If this is the case, then you'd expect to see it on every dive I guess?

Na, B***ocks

Next

[dave archer]

Ta for replies all - keep them coming as this issue is obviously far from resolved!

The air coming out of my HP was at the start of a dive with full tank. It wasn't happenning by the end with 50 bar.

I don't believe it is &quot;normal behaviour&quot; as it didn't use to do this at all

...so I'm leaning towards Rick's explanation that the holes are to allow air out as indicator that inner tube is going and needs replacing.

How much d'you reckon it should cost to get HP hose replaced?

Cheers,
Dave.

[Rick Huggins]

<font color='#0000FF'>At a guesstimate Dave, probs around £20 but they'll prob wanna service your guage too, well my LDS would!

Dick Turpin Scuba Centre

[Narked@50]

Hi Dave

Just bought one, £20 cash for a 21&quot; HP hose and ic came with the fittings to connect to my SPG. My previous one leaked from the joint at the reg. connection so had to go.

I would not dive with an HP hose which had bubbles coming from it (ok, I'd maybe do it on the day), as it's like a leak in a dam, once it has starterd, it is liable to go any time. I seen this happen to a dive guid in western australia, I pointed it out to him and he gave the usual ausie reply: &quot;she'll be 'right&quot;. Two days later (six dives) the hose gave out totaly while on a safety stop at 6m. I was at the back of the boat and just seen him coming up in a mass of bubbles, he was laughing, and shaking, at the same time. &quot;You were right about that hose mate&quot; he smirked as he walked past!

Light harted story, but this guy was doing 40m dives on it?!

Just get a new one, £20 is nothing.

James

[lawrence]

I can confirm that the holes are designed to prevent suden rupture of the hose when a leek developes from the inside- the hose should be relaced. If a service tech tells you otherwise, change your service tech! And people wonder why some prefer to service their own kit.