Bubbles coming out of hoses?

[in_cavediver]

I had this happen on a 7ft LP reg hose. For about 5 foot of it, lots of little bubbles. Hose never did break but we took it out of circulation for obvious reasons.

 

[in_cavediver]

change it before it blowes i saw a hp hose blow after bubbling last week luckly they were not to deep but looked like a wip and boy the air goes quickly, i have seen 3 others bubble in the last month we changed them all.

Interesting. Advanced Diver did a test to see how a leak actually drained a tank. I beleive they test the free-flow reg, burst LP host and burst HP hose. Of the three, the HP hose was the slowest to drain the tank and also wasn't depth dependent. It was is the +10 minute range. The LP hoses and free flow were in the sub 60 second range and depth dependent.

The reason for this is a standard HP hose has a very small bore for air to pass. The HP gauge simply doesn't need volume movements. LP hoses on the other hand do have large internal diameters and can flow a significant amount of air.

 

[JahJahwarrior]

why are the holes there at all? for all the bother about servicing gear annually since it's life support, why the heck doesn't somone discuss the fact that HP hoses seem to fail when brand new? I'll tell the guy to askthe LDS where he bought it, maybe they'll exchange it forhim. He's got a Cobra air integrated computer but I'm sure that it's not too hard to change out.

 

[cayman diver]

Interesting. Advanced Diver did a test to see how a leak actually drained a tank. I beleive they test the free-flow reg, burst LP host and burst HP hose. Of the three, the HP hose was the slowest to drain the tank and also wasn't depth dependent. It was is the +10 minute range. The LP hoses and free flow were in the sub 60 second range and depth dependent.

The reason for this is a standard HP hose has a very small bore for air to pass. The HP gauge simply doesn't need volume movements. LP hoses on the other hand do have large internal diameters and can flow a significant amount of air.

I agree they should have a very small hole, I just took apart my zeagle, mares and scubapro guages and all very small hole, but the guy on the boat said he brought his gear off ebay and it had no brand name on it. Prehaps there are some cheep chinese copys out there as this guys tank drained in about 3 mins. The guy was only here on holiday but i will see if we have his phone no so i can find out more about were it came from.

 

[Stu S.]

I had a 1970's Aqua Lung HP gauge that had a leak of the inner hose. This hose was too old to have those little safety relief holes. A section of the outer hose, about four inches long, filled with the leaking air and expanded to about two inches in diameter before it burst - right next to my ear. It sounded like a pistol being fired.

That's why the later put the holes in that outer hose.

 

[diebeste]

I think people are talking about different bubbles here. If I understand correctly, JahJahwarrior is talking about tiny water droplets forming on the HP hose on the surface after a dive, (yes, I noticed it on my brand new TUSA gauges HP hose as well). All the replies so far refer to air bubbles whilst diving (No, never had that).

BTW the TUSA depth gauge was too far off (under reading) for comfort, and also not adjustable for altitude. At 32mfw it was reading 25-26m. Given no altitude correction at 1300m above sea level, I would expect a reading of about 29m .... My LDS exchanged it for a poseidon gauge set with kevlar hose. This solved the bubbles, and the inaccuracy in one go. The poseidon gauges are also adjustable for altitude, and seems to fluoresce in the dark.

 

[Cold_Under_Here]

Hmm.

This happened to me on my first dive after my certification. My buddy and I had finished our first dive for the day, we were about to do our second dive and my HP hose felt like it had hundreds of little holes all over it.
We called the dive. It has perplexed me ever since.

 

[Dive-aholic]

We had this happen a while back. We immediately bought new hoses. Happened on those. Went and traded those out. It's happened a few times since, but not as bad. This was all in N. Florida. It has never happened in dry Arizona. My guess is that condensation gets in between the layers during the SI. When we pressurize the hoses, the condensation is forced out through the holes that are placed there. I don't think it's a big deal as long as you don't have air escaping in the water. That's why we do bubble checks at the beginning of every dive.

 

[DivetheRock]

The holes/bubbles that appear on my hose are, to my memory, on my SPG line. I'm not a tech nor an expert, but I inquired and found out that these holes are there to safely and effectively "release" unwanted moisture buildup in the hose itself. What you see is, apparently, condensation from the air transfer/pressure from the first stge approaching the second via the hose.
Like I said, I'm not a tech, but my gear is very new, well taken care of. My brother's is the same; he has the bubbles/holes in his line. I'm sure this is safe, but will inquire further now that I've come across this thread. BTW, there are no bubbles of air emanating from the line once submerged.

 

[101kreasons]

I posted this replay in wrong place. I have two year old Suunnto High Pressure hose. It leaks air continuously from tiny pin holes. The shop said this is normal. Is that right?