supercritical co2 extraction - diy community?

Fadedawg

Fadedawg

Well-Known Member
Rating and testing are different. A ASME tank tested to 9000 psi, would be rated at 3000 psi. Here is the experiments that we performed:

15.24 DIY SCFE CO2 - GrayWolf's Lair (graywolfslair.com)

Ostensibly, using heat instead of pumps will expose your material to a more wider pressure/temperature curve. Even if you heat the CO2 in a separate tank, as soon as you start transferring to the process tank, the pressure will fall.
 
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vapeitgud

Member
Fadedawg said:
Rating and testing are different. A ASME tank tested to 9000 psi, would be rated at 3000 psi. Here is the experiments that we performed:

15.24 DIY SCFE CO2 - GrayWolf's Lair (graywolfslair.com)

Ostensibly, using heat instead of pumps will expose your material to a more wider pressure/temperature curve. Even if you heat the CO2 in a separate tank, as soon as you start transferring to the process tank, the pressure will fall.
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Yes, thank you. Now that I take a closer look the aluminum CO2 tank has a service pressure of 1,800psi, and a 3,000psi pressure test. Whereas the carbon fiber tank has working pressure of 4,500psi, a pressure test at 7,250psi, and a minimum burst pressure of 15,000psi. (Those are rounded, it actually has 30 mpa, 50 mpa, and 102mpa)

Yea, without a pump to regulate the pressure it will be unavoidable to lose pressure throughout the process. Maybe after I get this up and running I will run some tests doing shorter cycles with larger tanks to minimalize the pressure difference. (As in using only 4# of C02 from a 20# tank)
 
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vapeitgud

Member
Fadedawg do you know anything about solenoid Valves? I want to use one to let out bursts of the liquid CO2 into the collection vessel for depressurization. But I am having trouble understanding how they are rated for pressure. I can't find any that mention pressure above 145psi, but a few of those mentioned wog 1000. Do solenoid Valves have two different pressure ratings for different things?
 
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