Gents
Use a balloon attached to one of the inlets/outlets of you tank.
Temporarily seal the other inlets/outlets. Use one of other inlets/outlets
to blow up the balloon so that it is about half inflated (on average 5 to
6inches diameter). Leave it sit for a couple of days. As the temperature
in your workshop varies the balloon will either inflate more or deflate with
expansion or contraction of the air with temp.
What you are looking for is, after a couple of days the balloon is still
inflated about the size you originally inflated it to. If it is like this
then you probably have no leaks.
This is standard practise on the Glasairs. Seems to work ok. The fun part
is finding and fixing the leak if you have one.
Another method is to fill the tank with a liquid (usually coloured water to
almost full) then pressurise with air. Then look for leaks of coloured
water.
NOTE you only need a few pounds of pressure (3 to 4 at most). A bicycle pump
is ok to pump up with, this way you are pumping it up slow so you will see
any damage that is about to occur if you pressurise too much.
Hope this helps.
Cheers Peter
-----Original Message-----
From: KRnet [mailto:krnet-bounces at list.krnet.org] On Behalf Of Larry&Sallie
Flesner
Sent: Friday, 31 January 2014 10:03 AM
To: KRnet
Subject: Re: KR> Pressure testing my wing tanks
>Gas molecules are smaller than water molecules. Water testing for leaks
>is inconclusive.
>Gary
++++++++++++++++++++++++++++++++++++++++++++++++++
So true. Gas will leak it a big way through a hole that holds water. I use
a funnel to filter fuel that passes gas at a high rate but not a single drop
of water.
When looking for a leak, use an 18 to 24 inch length of small diameter hose.
Place one end in your ear and pass the other end over seams and areas of the
tank you suspect may contain a leak. With 2 or 3 pounds of air pressure in
the tank, a leak is hard to miss. It will put a very noticeable hiss in your
ear.
Larry Flesner
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