primary reg hose

[diving_moose]

Hi,
Any ideas were i can purchase a longer hose for my poseidon primary reg as i believe the prices can be scary and any ideas what most twin set divers use in regards to longer hoses. I am also looking for a poseidon 1st stage on its own as i was going to use the octopus poseidon reg on the left pillar and the primary on the right pillar or is this not a good idea.
Cheers again lee

[diverdman]

I have a 5ft hose custom for Poseidon Jetstream + reg for sale, maybe.
I use a 7ft hose on my Apeks primary reg and short hose on my backup Apeks reg
A 5ft hose is good for ocean stuff.
I loved a Jetstream but would never carry one as a occy(backup reg).
The 1st stage is nice for twin hose routing or makes a nice compact deco 1st Cheerio

[andrallan]

I use Jetstreams on my twinset. My primary is off the righthand post on a 2m hose ("Hog Looped") and my backup, off the left post, is on an octo length hose run under my right shoulder then neclaced (I found this more comfortable than routing the Jetstream over my left shoulder.
I got my 2m hose from SDS and you are right they ain't cheap!!! Given the Jetstreams different interstage pressures and rather individual connectors I didn't want to risk anything other than a Poseidon hose.

[Reeve]

I had a quote of £100 for a 2M hose for my Triton. Currently still using the std hose lengths for both.

Need to change one but am reluctant at that price. I should look into aquiring a cheaper or having one made up for me. The problem is the connectors are a one time use design so can not be salvaged.

g.

[alunharford]

Originally Posted by andrallan

I use Jetstreams on my twinset. My primary is off the righthand post on a 2m hose ("Hog Looped") and my backup, off the left post, is on an octo length hose run under my right shoulder then neclaced (I found this more comfortable than routing the Jetstream over my left shoulder.
I got my 2m hose from SDS and you are right they ain't cheap!!! Given the Jetstreams different interstage pressures and rather individual connectors I didn't want to risk anything other than a Poseidon hose.

? What's so different about the Jetstream's IP?
The Cyclon has a very high IP, but the Jetstream's is (IIRC) 9.5bar, which isn't that high.
The reason the hoses cost an arm and a leg is that they've got a little over-pressure release valve in case the high pressure seat fails and the IP goes sky high.

[Digger]

Jetstream runs on higher IP than Cyklon. What exactly that is depends on how you like to run your regs, but a Cyklon shouldn't be up at 10 bar. 9.5 is high for an IP, most normal regs will run at much lower.

£100 for a hose? Sell the regs. You're going to need spares anyway, and at that price I'd be going elsewhere. And where can you get them? Not at dive sites, so you'll need backups or more regs.

For just a first stage, I'd trawl the personals and try ebay, divernet and similar. Once you've got it, get it serviced and it's good as new! Or you could find a friendly LDS and buy a new one. Shouldn't be too expensive.

I found 5' hoses too short for a primary, and too long for just about anything else! I don't know how others are rigging these, but on a single upright I found it very uncomfortable not being able to move my head.

[beanie]

I've got a 2m jetstream hose not currently in use

and I'm probably going to flog my jetstreams soon

there not £100 by the way whoever said that was out to pull a fast one

[Angus]

Digger's favorite dive shop Deep Blue sell all the Poseidon hoses. I think you find that they're around £50 which is about average.

ATB

[Angus]

[quote=alunharfordThe reason the hoses cost an arm and a leg is that they've got a little over-pressure release valve in case the high pressure seat fails and the IP goes sky high.[/QUOTE]Neither the Jetstream or the Cyclon have any type of valve built into the hose, although the Jetstream does have one built into the coupling.

The reason the hoses cost so much is because only the Poseidon hoses fit the relevant regs and therefore they can charge pretty much what they like, a bit like service stations on motorways etc.

[M J S]

Originally Posted by Digger

Jetstream runs on higher IP than Cyklon. What exactly that is depends on how you like to run your regs, but a Cyklon shouldn't be up at 10 bar. 9.5 is high for an IP, most normal regs will run at much lower.

I found 5' hoses too short for a primary, and too long for just about anything else! I don't know how others are rigging these, but on a single upright I found it very uncomfortable not being able to move my head.

The Jetstream interstage pressure on the modern 3960 first stage is up to 10 bar maximum (around 9 bar average is OK) whereas the cyklon 5000 runs at up to 12 bar ( I run mine at 11.5 and have done so for years without incident).

Why is 9.5 bar high for an IP?
Just because that was the pressure found to work best on a bunch of unbalanced piston first stages three decades ago?

The reg should run at whatever the manufacturer has designed it to work at to maximise performance.

Agree with Digs on the 5ft hose, you'll probably find it too short; go for the 215cm hose which poseidon offer. There were a few guys in the midlands knocking up 2 metre hoses for jetstreams with some industrial grade hose crimped to fittings removed from standard length hoses. These had very high burst pressures due to the much thicker side walls. Be very wary when being offered such a product, we tested one and the WOB on the test rig went through the roof. A genuine 215cm hose should set you back around the £60 mark.

The jet hose does indeed have a pressure relief valve fitted into the end of the hose where it connects to the second stage; as interstage pressure rises due to HP seat failure the valve stretches until the O'ring seal is broken. This is demonstrated when you gently pull the second stage away from the hose.

Incidentally, increasing the IP excessively on an upstream valve such as a jetstream increases the cracking resistance and overall WOB, reducing performance.

Regards
MJS