Can anyone compare the FX5 to the eheim 2262?
- Thread starter tcarswell
- Start date
I did some more testing on the filter after getting some supplies. I was able to get the pump to reach 12 Hg (-5.79 PSI or .413 ATM). Higher than 3.86 as before. This was about 2" away from the impellers eye.
25.2 Hg will boil water at 80*F
When filling the pump area with water and expelling all the air, when I turn the pump on, you can instantly here the impeller cavitating and air being thrown around because I used the rubber plugs to plug the impellers intake and allow a gauge to hook up to it. After the pump shuts off, air is expelled.
Now I know 5.79 PSI is not enough to lower the boiling point of water down to the temp at which I was testing so my theory is this, when degasification occurs, dissolved gases are released from the water. These gases are compressible which means the impeller will not be able to create any hydraulic pressure much lower than what I noted above. You can see the vacuum gauge bouncing slightly during this process which indicates to me its loosing and gaining hydraulic pressure but can't get ahead. I do think that there is a point when the impeller is just throwing the extracted gases around and not removing dissolved gases due to the extreme low pressure being raised slightly because of the compressible gases.
On the other hand, if there was water moving through the pump, than there would be a continuously fed water which could allow the impeller to reduce the pressure more.
5.79 PSI is just about enough to lower the boiling point of water to 180-190*F
25.2 Hg will boil water at 80*F
When filling the pump area with water and expelling all the air, when I turn the pump on, you can instantly here the impeller cavitating and air being thrown around because I used the rubber plugs to plug the impellers intake and allow a gauge to hook up to it. After the pump shuts off, air is expelled.
Now I know 5.79 PSI is not enough to lower the boiling point of water down to the temp at which I was testing so my theory is this, when degasification occurs, dissolved gases are released from the water. These gases are compressible which means the impeller will not be able to create any hydraulic pressure much lower than what I noted above. You can see the vacuum gauge bouncing slightly during this process which indicates to me its loosing and gaining hydraulic pressure but can't get ahead. I do think that there is a point when the impeller is just throwing the extracted gases around and not removing dissolved gases due to the extreme low pressure being raised slightly because of the compressible gases.
On the other hand, if there was water moving through the pump, than there would be a continuously fed water which could allow the impeller to reduce the pressure more.
5.79 PSI is just about enough to lower the boiling point of water to 180-190*F
I have always been curious about that. I will need more sensitive equipment and possibly a computer to graph the instantaneous pressure drop before cavitation occurs. So basically, this is as far as I will go for now.
I don't think there is another canister filter than can produce such results but I may be wrong.
I wish I had a 2262 to test because this would prove the efficiency of the impeller design I think. Wouldn't mean much to others but it would to me.
Anyone else able to test the flow of their 2262?
I don't think there is another canister filter than can produce such results but I may be wrong.
I wish I had a 2262 to test because this would prove the efficiency of the impeller design I think. Wouldn't mean much to others but it would to me.
Anyone else able to test the flow of their 2262?
Howdy,
First off, respect that you are so dedicated. However, I am sorry to see that you do not know when to stop, to see you spend time, money, and members' time on stuff that's not feasible...
People go to college and grad school to understand the theory behind those phenomena...googling won't do much in this case.
No. The pressure to boil water at 80F is 0.03 bar, or 22.5 mm Hg, or 0.44 psi, or 0.03 atm. You will not, I repeat NOT, be able to reach this with an aquarium pump. As I said earlier, even a lab-grade diaphragm vacuum pump barely reaches that. You should really trust me on that. Evaporating water with reduced pressure is an annoying task.
At some point, you should trust the professional and silently bow out instead of raising a fuss. Your reputation would've suffered less had you withdrawn 25 posts ago:
But do not be discouraged. If you are as old as I think you are, then you have a bright future ahead of you as scientist. You have the right mindset and vigor. You should major in physics when you are in college. You will have fun not only running studies but understanding the background as well.
HarleyK
First off, respect that you are so dedicated. However, I am sorry to see that you do not know when to stop, to see you spend time, money, and members' time on stuff that's not feasible...
Jgray152;3099161; said:
People go to college and grad school to understand the theory behind those phenomena...googling won't do much in this case.
Jgray152;3096757; said:
No. The pressure to boil water at 80F is 0.03 bar, or 22.5 mm Hg, or 0.44 psi, or 0.03 atm. You will not, I repeat NOT, be able to reach this with an aquarium pump. As I said earlier, even a lab-grade diaphragm vacuum pump barely reaches that. You should really trust me on that. Evaporating water with reduced pressure is an annoying task.
At some point, you should trust the professional and silently bow out instead of raising a fuss. Your reputation would've suffered less had you withdrawn 25 posts ago:
12 Volt Man;3093213; said:
But do not be discouraged. If you are as old as I think you are, then you have a bright future ahead of you as scientist. You have the right mindset and vigor. You should major in physics when you are in college. You will have fun not only running studies but understanding the background as well.
HarleyK
ps my first year physics course at the University of Toronto was brutal. talk about a weed out course. luckily, I was not one of the ones who didn't make it..
I still have nightmares about the exam lol
when you get to put those letters after your name in the end, it all becomes worth it..
Leptar;3094053; said:
Just cleaned out the FX5 yesterday... it's been 6+ months since it's last cleaning.....
was about a month ago i noticed that the flow did drop quite a bit during a water change...
Tank always had a clean "earthy" smell even when i fed massivore.. wierd.. any other tank would "stink" badly...
Next time i open it up i am going to put the substrat pro that is in the bottom tray in a media bag and loose the thin pad to keep the balls from falling thru..
sponges were 75-80% junked... top blue pad was dirty but not clogged...
I didn't take any pics as the cameras were not charged but the way the sponges looked in the pic where you can see the rings from back in May was the way the sponges looked on all 3 levels...
Picture in post #86
Only thing I did not have in the filter was the "white" polishing pad...
