max tank vacuum

[Ron Shannon]

So... I'm going after the fuel tank seepage again once again attempting to
draw in Loctite 609 with negative tank pressure, as recommended by my EAA
Tech Advisor months ago. The seepage hasn't kept me from putting on 65+
hrs., but is a nuisance, and something I would like to correct before
painting, if possible. The first time I did this I used ~0.5 PSI of vacuum,
as measured by a rather sticky, non-precision meter -- with not very
impressive results. This time I have fancier equipment, and am contemplating
probably going to ~28 in/WC (1.01 PSI) or thereabouts. I know this issue has
been loosely covered a few times before, but the question is:

What is the maximum recommended vacuum pressure, short of inviting an
implosion disaster? I need to calibrate the non-precision anxiety meter to
max out at a slightly lower value.

Thanks.

Ron

PS - Along with your recommendation, please include your current home
address, driver's license, passport #, spouse's name, name and DOB of first
born, etc.




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[Ron Shannon]

Golly, I was just kidding about the PS but, to show remorse & reform anyway,
I've already (re)enrolled in the Rebel Builder's Etiquette & Ethics
Education Program (a.k.a. "RBEEEP"). ;-)

One person replied direct, conveying someone else's (anonymous) quasi-formal
engineering analysis (with graphics I don't really understand) to the effect
that a 1.5 PSI vacuum should not be feared. Has anyone actually had the
misfortune to crumple the tanks doing this?

Ron


On Tue, Mar 1, 2011 at 3:15 PM, Ron Shannon <rshannon@cruzcom.com> wrote:

So... I'm going after the fuel tank seepage again once again attempting to
draw in Loctite 609 with negative tank pressure, as recommended by my EAA
Tech Advisor months ago. The seepage hasn't kept me from putting on 65+
hrs., but is a nuisance, and something I would like to correct before
painting, if possible. The first time I did this I used ~0.5 PSI of vacuum,
as measured by a rather sticky, non-precision meter -- with not very
impressive results. This time I have fancier equipment, and am contemplating
probably going to ~28 in/WC (1.01 PSI) or thereabouts. I know this issue has
been loosely covered a few times before, but the question is:

What is the maximum recommended vacuum pressure, short of inviting an
implosion disaster? I need to calibrate the non-precision anxiety meter to
max out at a slightly lower value.

Thanks.

Ron

PS - Along with your recommendation, please include your current home
address, driver's license, passport #, spouse's name, name and DOB of first
born, etc.

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