Why the low pressure gauge on some Hookah rigs?

[Waterwulf]

I am getting into Hookah/SNUBA diving and have been looking at some factory store bought rigs. Some of them have a low pressure IP type gauge on the divers rig. That way, they can check the low pressure air in the supply line while on the dive.

Why? What will knowing the IP pressure do for me as the diver? What good is it? Does it have a legitimate purpose?

 

[iain/hsm]

Why? What will knowing the IP pressure do for me as the diver? What good is it? Does it have a legitimate purpose?

It's a throwback from an old Commercial Divers term:

"One Breath From Death DESCO"

The reason and meaning of which will just add more confusion in your life and may hinder your internet online purchase decisions.

 

[Waterwulf]

It's a throwback from an old Commercial Divers term:

"One Breath From Death DESCO"

The reason and meaning of which will just add more confusion in your life and may hinder your internet online purchase decisions.

Oh stop it already. You’re just PO’d because someone questioned your expertise by calling you out on a stupid statement.

Don’t use a filter because it may get plugged up and restrict the flow.

Well duh! That’s what a filter is supposed to do. That’s why you’re supposed to change them on a regular basis. Just own it and move on.

 

[iain/hsm]

Oh stop it already. You’re just PO’d because someone questioned your expertise by calling you out on a stupid statement.

Don’t use a filter because it may get plugged up and restrict the flow.

Well duh! That’s what a filter is supposed to do. That’s why you’re supposed to change them on a regular basis. Just own it and move on.

Again that's not what I said. Honestly I'm sad to see this decline
First confusion now delusion. Next frustration after that anger.

 

[CG43]

It's a throwback from an old Commercial Divers term:

"One Breath From Death DESCO"

I love this therm !
My first diving device was a hand pump with a 50m garden hose and a self-made breathing set with savety-non-return valve and exhalation valve.
As the hose occasionally kinked you had to wait to see if the boy at the pump could eject the kink or maybe he was just too lazy to keep pumping. Well, we were all freedivers and decompression dives cannot be achieved easyly with one person on a hand pump.

IP measurement makes sense if the system has a IP storage tank ,
and to see if the compressor is pumping enough.
Let's assume the IP tank has a volume of 50 l, the compressor delivers 6 bar, the diver is at a depth of 10 m, needs 12.5 l/min and can empty the tank to 2 bar.
If the compressor stops, the diver now has 8 minutes until the pressure in the IP tank reaches 2 bar.
If the diver checks his pressure gauge every 4 minutes, he will notice the drop in pressure.
Whether he notices this solely due to the breathing resistance depends on the regulator.
With a regulator that is specially designed to work with very low IP and a large IP tank,
you can see a point of the IP measurement.

 

[Waterwulf]

Again that's not what I said. Honestly I'm sad to see this decline
First confusion now delusion. Next frustration after that anger.

Shoo Troll!

 

[Waterwulf]

IP measurement makes sense if the system has a IP storage tank ,
and to see if the compressor is pumping enough.
Let's assume the IP tank has a volume of 50 l, the compressor delivers 6 bar, the diver is at a depth of 10 m, needs 12.5 l/min and can empty the tank to 2 bar.
If the compressor stops, the diver now has 8 minutes until the pressure in the IP tank reaches 2 bar.
If the diver checks his pressure gauge every 4 minutes, he will notice the drop in pressure.
Whether he notices this solely due to the breathing resistance depends on the regulator.
With a regulator that is specially designed to work with very low IP and a large IP tank,
you can see a point of the IP measurement.

Yeah, that makes sense. I'll be using a tank as the air supply so I'm thinking it would not benefit me in that configuration.

 

[CG43]

Hello Waterwulf

If you use a unbalanced first stage that has a lot of IP change like the Nemrod Snark II
then the IP gives you some information about your tank pressure .

 

[Waterwulf]

Hello Waterwulf

If you use a unbalanced first stage that has a lot of IP change like the Nemrod Snark II
then the IP gives you some information about your tank pressure .

That's interesting. So the IP pressure will drop as the tank pressure drops? I guess the only way to know for sure is to try it out. Thanks.

 

[CG43]

This depends on whether the first stage opens with or against the HP.
With a piston stage like SP Mark 2 which opens with the pressure the IP decreases with decreasing cylinder pressure. The pressure difference between full and almost empty tank is about 2 bar .
Diaphragm stages almost always open against the pressure , here the IP increases with decreasing HP until there is less pressure in the tank than IP .