yakexplorer
Mechanical
- Feb 26, 2012
- 1
Hi people,
I'm posting to request some help/ideas on how one could increase (and keep constant) the pressure in a high pressure gas cylinder of nitrous oxide (a self-pressurizing gas critical pressure 76 bar 1102 psi).
But first a little word on the application itself
(a research project), here's an overview :
- It consists of 3 high pressure steel cylinders from Praxair
that look like those in the attachment "gas cylinders"
-It contains N2O (Nitrous oxide) a self-pressurizing gas at around 51 bar (740 psi)
-Each cylinder is linked to a peterpaul electrovalve needed for the application (increases flow) through 1/4" Swagelok flexible tubing
-The N2O flow (mostly LIQUID) is mixed through a 1/2" union cross thanks to a set of 1/4" to 1/2" adapters
-The resulting flow goes to a Hall effect flowmeter in a 1/2" flexible tube and exits that same flowmeter through a 1/2" flexible tube.
-The N2O is injected into the application at high pressure
One sees the venting system (nitrogen) from Praxair where the nitrogen stored at a pressure of 200 bars is released
at a pressure of 8 bars to purge the system and it works fine.
We've noticed that as N2O is released the pressure decreases (as expected), so we were thinking about a system that would pressurize (keep a higher pressure than 51 bar (740 psi) and keep it constant) are there special cylinders that do that ? I've been looking into the praxair catalogue and first thought of using a pressure regulator but it doesn't increase the pressure in their catalogue (p 79) they tell of 51.36 bar/745 psi cylinders for that gas N2O, so is that the only pressure range available ? What could we do except contacting praxair directly?
Thank you for your kind help
PS: a turbopump for N2O is out of budget for us.
I'm posting to request some help/ideas on how one could increase (and keep constant) the pressure in a high pressure gas cylinder of nitrous oxide (a self-pressurizing gas critical pressure 76 bar 1102 psi).
But first a little word on the application itself
(a research project), here's an overview :
- It consists of 3 high pressure steel cylinders from Praxair
that look like those in the attachment "gas cylinders"
-It contains N2O (Nitrous oxide) a self-pressurizing gas at around 51 bar (740 psi)
-Each cylinder is linked to a peterpaul electrovalve needed for the application (increases flow) through 1/4" Swagelok flexible tubing
-The N2O flow (mostly LIQUID) is mixed through a 1/2" union cross thanks to a set of 1/4" to 1/2" adapters
-The resulting flow goes to a Hall effect flowmeter in a 1/2" flexible tube and exits that same flowmeter through a 1/2" flexible tube.
-The N2O is injected into the application at high pressure
One sees the venting system (nitrogen) from Praxair where the nitrogen stored at a pressure of 200 bars is released
at a pressure of 8 bars to purge the system and it works fine.
We've noticed that as N2O is released the pressure decreases (as expected), so we were thinking about a system that would pressurize (keep a higher pressure than 51 bar (740 psi) and keep it constant) are there special cylinders that do that ? I've been looking into the praxair catalogue and first thought of using a pressure regulator but it doesn't increase the pressure in their catalogue (p 79) they tell of 51.36 bar/745 psi cylinders for that gas N2O, so is that the only pressure range available ? What could we do except contacting praxair directly?
Thank you for your kind help
PS: a turbopump for N2O is out of budget for us.
