View Full Version : commissioning of the co2 cascade systems...

02-12-2008, 07:59 PM

I am a student in Univercity for MS degree and I am working on CO2, I designed a cascade system with CO2 and R-404A for the test.

Do you suggest any thing to me before charge the CO2 to the system for security during the filling? Or is there any installation manual for commisioning and charrge the CO2 to sytem?

Thank in advance for your replies.


Ayse Karaoz

02-12-2008, 09:24 PM
* first make sure you have a vacuum pump to 62 microns on the CO2 system
* since it is a cascade system you are in the sub-critical CO2 applications, your design working pressure I am assuming to be 400 psi, you should have an ASME relief valve to protect the CO2 system.
* inspect the relief valve and its location to reduce the possibility of liquid passing through the triple point and solidifying in the relief valve outlet [review B52 code for proper installation]
* you must charge the CO2 [R744] system in the vapour phase until the pressure has reached 70 psig [ 4.8 bars] min.

Camille Zabbal

04-12-2008, 08:18 PM
Hi Camille;

Thank you very much for your kind reply. If I send my cascade design to you; can you check it basicly?

Best Regards;

05-12-2008, 01:13 PM
please do send a schematic

04-01-2009, 08:08 PM
Hi Camille;

Sorry for my late reply because of some problems I couln't turn you. Please find my design from the below link.
rapidshare /files/179783710/CO2_TESISAT_SEMASI_060808_1_.pdf

On the schematic;

4-plate heat exchanger
5-expansion valve
6-selonoid valve
7-sight glas
9-liquid tank
10-oil separator
22-safety valve

Thanks in advance for your reply.

04-01-2009, 08:17 PM
Dear Camilli;

I am not allowed to send a link to you from this web page.

Please add;

h.t.p.\.r.p.d.h.r...com before the files/179.... and please add ..............html after pdf.

If you can send your e-mail adress; I can send thre also.

Thank you very much.