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Post by groom on Jan 19, 2023 16:00:17 GMT
How does the difference in sea level affect deareation in dialysis machines?
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Post by Zombie on Jan 19, 2023 18:43:12 GMT
As altitude increases, the amount of gas molecules in the air decreases—the air becomes less dense than air nearer to sea level. This is what meteorologists and mountaineers mean by "thin air." Thin air exerts less pressure than air at a lower altitude.
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Post by Chuck Weddle on Jan 19, 2023 20:14:19 GMT
Think of it as a bottle of beer. When the cap is on you can think of that as "sea level" and the pressure in the air at the top of the bottle keeps the dissolved CO2 in solution. When you remove the cap and release the pressure is the same as going up in altitude. The lower pressure allows the CO2 to come out of solution.
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Post by groom on Jan 20, 2023 16:36:59 GMT
As altitude increases, the amount of gas molecules in the air decreases—the air becomes less dense than air nearer to sea level. This is what meteorologists and mountaineers mean by "thin air." Thin air exerts less pressure than air at a lower altitude. So the higher above sea level, the lower the degas setting?
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Post by groom on Jan 20, 2023 17:50:25 GMT
The only reason I ask, is because this question was on my Bonent CHBT exam
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Post by Chuck Weddle on Jan 20, 2023 19:12:23 GMT
At sea level, the greatest vacuum that can be achieved is just under -30 mmHg (-29.96). At 5000 ft, that is decreased to just under -25 mmHg. So, the higher above sea level you go, your ability to achieve a given pressure decreases meaning, your deareation pump will have to run faster to create the vacuum needed. Go high enough and it may not be possible.
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Post by bcjammerx on Jan 21, 2023 18:06:12 GMT
At sea level, the greatest vacuum that can be achieved is just under -30 mmHg (-29.96). At 5000 ft, that is decreased to just under -25 mmHg. So, the higher above sea level you go, your ability to achieve a given pressure decreases meaning, your deareation pump will have to run faster to create the vacuum needed. Go high enough and it may not be possible. over 10k feet you just tell the machine "Dave's not here man"
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stuff
Full Member
Posts: 220
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Post by stuff on Jan 23, 2023 14:01:39 GMT
There goes my elite space dialysis program =(
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Post by Chuck Weddle on Jan 23, 2023 14:43:59 GMT
This is making my head hurt thinking this through..... Since at altitude there is less atmospheric pressure to keep dissolved gasses in solution....would less vacuum be needed to deareate a solution? Like water boils at a lower temperature at high altitudes.
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