Separate 1st & 2nd Stages

[krash]

Been using a hooka rig for years, as well as free diving with mask fins & snorkel. We pull up jump in take a quick check and if ya see antennae, anchor and tickle um out, pull anchor and move on. The hooka is a PITA for these quick hits, Looking to set up a extend the hose between 1st and 2nd stage, leave the tank onboard, "if antennae", gear up with weight belt mask & 2nd stage an hit it.

How far could one separate the 1st & 2nd stage, in depths less than 40'.

 

[knotical]

Interesting question. Brownie’s has up to 150 foot hoses, and Air Line sells 100 foot hose extensions. I suspect the physics upper limit could be quite a bit higher. But the practical limit might be the ability to manage longer hoses around reefs.

 

[marchand]

You could probably go 5 atmospheres before it gets really hard to breathe. By the time you get to 165' the ambient pressure is up to 73.5psi. The intermediate pressure is usually set to ~140psi for most first stages. So, when you have a first stage on the surface and you are at a depth of 165' the intermediate pressure at the second stage is effectively lowered to 66.5psi. Try tuning a first stage to lower intermediate pressures while breathing off of the second. when it gets too hard for you to breathe comfortably not the intermediate pressure and use that number to figure out to what depth you can take it.

Alternately, you can adjust the first stage to a higher IP so that when you are at depth the IP at the second stage will be somewhere between 100-130 psi.

If you are doing this in salt water to no more than 40' the IP will not be lowered by more than 20psi. Adjust the IP to something around 150psi at the first stage and it will drop to around 130psi when you are at depth.

 

[Bob3]

We have 150' of hose on our hookah rigs; you probably wouldn't want it a whole lot longer as it becomes a pain in the neck to handle.
Hose reels help & they won't hold much over 150' of standard hookah hose.

 

[beanojones]

Interesting question. Brownie’s has up to 150 foot hoses, and Air Line sells 100 foot hose extensions. I suspect the physics upper limit could be quite a bit higher. But the practical limit might be the ability to manage longer hoses around reefs.

Those long runs are for hull cleaners for the most part where you are not going down more than 20 fsw. Or for Snuba, again not going deep.

 

[knotical]

Those long runs are for hull cleaners for the most part where you are not going down more than 20 fsw. Or for Snuba, again not going deep.

Agreed. I was trying to respond to the OP’s question of:

How far could one separate the 1st & 2nd stage, in depths less than 40'.

 

[krash]

No worries about the depths, except perhaps time,.. the hooka we use has (2) 75' hoses and the motor will run for hours so its easy to loose track of bottom time if you're catching bugs and poping hogs.

For the boat and kayak setup I'm thinking a single 60' hose. Brownies actually makes a Kayak Kit. There may be other kits available, may also just look into a hose manu.

Suggestions welcome.

 

[beanojones]

Dive computer?