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#1
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Positive Tank Pressure
Anyone have any information about how important it is for a fuel tank
to maintain positive pressure on the inside? I mean *above* atmospheric. Part 23 only makes reference to tanks with bladders; these are required to maintain a positive pressure so they won't collapse. A C172, though, doesn't have bladders. The forward facing fuel vent most likely *does* provide positive tank pressure, but that may not actually be necessary in order to ensure fuel flow. |
#2
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In article ,
Greg Esres wrote: Anyone have any information about how important it is for a fuel tank to maintain positive pressure on the inside? I mean *above* atmospheric. http://www.delta.edu/slime/cancrush.html -- Ben Jackson http://www.ben.com/ |
#3
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Clearly it isn't required or the plane couldn't be started while stationary
on the ground. Mike MU-2 "Greg Esres" wrote in message ... Anyone have any information about how important it is for a fuel tank to maintain positive pressure on the inside? I mean *above* atmospheric. Part 23 only makes reference to tanks with bladders; these are required to maintain a positive pressure so they won't collapse. A C172, though, doesn't have bladders. The forward facing fuel vent most likely *does* provide positive tank pressure, but that may not actually be necessary in order to ensure fuel flow. |
#4
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Check out Parts 23.965 and 23.975.
I see nothing of relevance in these two sections. .965 talks about the pressure that a tank must be able to withstand and .975 talks about venting...nothing about positive pressure. What am I missing? |
#5
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http://www.delta.edu/slime/cancrush.html
All I see on that page is the perils of negative pressure. Of that, I'm well aware. Doesn't seem relevant to the issue of maintaining positive pressure. |
#6
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"Greg Esres" wrote in message ... Check out Parts 23.965 and 23.975. I see nothing of relevance in these two sections. .965 talks about the pressure that a tank must be able to withstand and .975 talks about venting...nothing about positive pressure. What am I missing? The tanks in my plane are not under positive pressure. Haven't been since March of 1947. I see no reason that they need to be. Gravity hasn't failed yet. |
#7
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"Greg Esres" wrote in message ... Anyone have any information about how important it is for a fuel tank to maintain positive pressure on the inside? I mean *above* atmospheric. It isn't important. All you want to do is provide a vent so the tank doesn't go negative. Part 23 only makes reference to tanks with bladders; these are required to maintain a positive pressure so they won't collapse. A C172, though, doesn't have bladders. The forward facing fuel vent most likely *does* provide positive tank pressure, but that may not actually be necessary in order to ensure fuel flow. |
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