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Tank Testing

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Jerry Cochran

Joined: 10 Jan 2006
Posts: 111
Location: Wilsonville, OR

Posted: Tue Aug 05, 2008 8:52 am Post subject: Tank Testing

I had to remove both fuel senders and reseal so am testing for integrity. The instructions for testing with a manometer are saying either 2 to 3 inches diff in water levels or 2 feet 3 inches, can't tell which. Before bothering Van's and displaying my ignorance anyone here know the answer for sure? I'd rather not blow my tanks apart, ya know...



Thanks all,



Jerry



Oh, BTW... I would never, repeat NEVER use the supplied rubber gaskets again.

I could not figure out why I'd never get a drip on the hangar floor but mysterious fuel streaks down the belly. My hangar mate pointed out that at speed the fuel vents can slightly pressurize the tanks. Fact or fiction? You decide. I took senders out, slathered proseal and replaced. Hopefully fixed.

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dvanwinkle(at)royell.org
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Posted: Tue Aug 05, 2008 12:52 pm Post subject: Tank Testing

Jerry



The differential is 2 ft 3 inches which equates to approx one PSI.  This is

what I used for my RV-9A tanks and worked very well.  Even with one PSI, you

will see a small amount of skin deflection between the tank ribs while

pressurized.  Also be aware that the differential is very sensitive to

temperature changes, even if you have no leaks.



Dean Van Winkle

dvanwinkle(at)royell.org



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wskimike(at)mchsi.com
Guest

Posted: Tue Aug 05, 2008 2:35 pm Post subject: Tank Testing

You better have a quality regulator to ensure you only put one PSI in the 

tank. You can damage the tank with three PSI.

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matronics(at)cencula.com
Guest

Posted: Tue Aug 05, 2008 2:42 pm Post subject: Tank Testing

Jerry,



Here's some info on testing the tanks...including the relationship 

between temperature and pressure:



http://www.our7a.com/20070911.html



Good luck!



Mike



Jerry Cochran wrote:

 	  Quote: 	
		   



 I had to remove both fuel senders and reseal so am testing for integrity. The instructions for testing with a manometer are saying either 2 to 3 inches diff in water levels or 2 feet 3 inches, can't tell which. Before bothering Van's and displaying my ignorance anyone here know the answer for sure? I'd rather not blow my tanks apart, ya know...



 Thanks all,



 Jerry



 Oh, BTW... I would never, repeat NEVER use the supplied rubber gaskets again.

 I could not figure out why I'd never get a drip on the hangar floor but mysterious fuel streaks down the belly. My hangar mate pointed out that at speed the fuel vents can slightly pressurize the tanks. Fact or fiction? You decide. I took senders out, slathered proseal and replaced. Hopefully fixed.

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 http://forums.matronics.com/viewtopic.php?p=196662#196662

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tcone1(at)comcast.net
Guest

Posted: Tue Aug 05, 2008 4:19 pm Post subject: Tank Testing

STOP!!!!  Do not hook your tank up to ANY pressure source...I don't care 

what kind of regulator you have.  Fuel tanks and compressed gasses do not go 

together.

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Jerry Cochran

Joined: 10 Jan 2006
Posts: 111
Location: Wilsonville, OR

Posted: Tue Aug 05, 2008 5:58 pm Post subject: Tank Testing

Thanx Dean,

  

 Using 27" overnite as we speak. Lookinf good so far...

  

 Jerry

  

  In a message dated 8/5/2008 1:55:30 P.M. Pacific Daylight Time,  dvanwinkle(at)royell.org writes:

  	  Quote: 	
		  Jerry



The differential is 2 ft 3 inches which equates to approx    one PSI.  This is

what I used for my RV-9A tanks and worked very    well.  Even with one PSI, you

will see a small amount of skin    deflection between the tank ribs while

pressurized.  Also be aware    that the differential is very sensitive to

temperature changes, even if you    have no leaks.



Dean Van  Winkle

dvanwinkle(at)royell.org 	




Looking for a car that's sporty, fun and fits in your budget? Read reviews on AOL Autos.

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wskimike(at)mchsi.com
Guest

Posted: Wed Aug 06, 2008 6:07 pm Post subject: Tank Testing

It is a standard practice in aviation to pressurize bladder and sealed 

tanks. Vans even  tells you how to do it before installing the tanks. If you 

are really concerned, just disconnect the vent line from the wing root and 

put a balloon on the vent line fitting and screw the pump fitting into the 

low point drain like Vans tells you. Then, pump it slowly to prevent too 

much pressure.



Mike

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