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  #1  
Old 10-19-2017, 10:16 PM
mfleming's Avatar
mfleming mfleming is offline
 
Join Date: Sep 2016
Location: Joseph, Oregon
Posts: 798
Default Completed Initial Leak Test of The Left Tank

Initial test of the left fuel tank has passed.

The Float access plate was tested with the cork gasket installed. Now that the initial test was a success, I'll pull the plate, remove the cork gasket, pro seal up the plate, reinstall and retest.

The multimeter is measuring ambient temperature for a reference as I recorded pressures during the test.

During the test I used a leak test fluid to check all the seams and rivets.



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Michael Fleming
Joseph, OR
sagriver at icloud dot com

RV-7 Slider #74572
Started 11/2016
Empennage completed 11/2016 (sans fiberglass)
Ailerons and flaps completed 3/2017.
Wings completed 12/2017
Started on QB fuselage 01/2018
Sliding canopy mostly completed 10/2020
Wiring and Avionics harness completed 9/2/2021
FWF Started 9/3/2021

Donated for 2021 and so should you
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  #2  
Old 10-19-2017, 10:22 PM
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jcarne jcarne is offline
 
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Location: Worland, Wyoming
Posts: 1,981
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I'm keeping my fingers crossed for you. I'll be right behind you, I'll probably get to that in a couple of weeks.
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  #3  
Old 10-20-2017, 12:23 AM
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Join Date: Jul 2014
Location: Phoenix, AZ and Senoia, GA
Posts: 98
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Lots of luck! My RV8 tanks are being tested now also. So far, so good....
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  #4  
Old 10-20-2017, 12:32 AM
Beancounter Beancounter is offline
 
Join Date: Oct 2007
Location: Canada
Posts: 100
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I will keep my fingers crossed for you too, that the cork gasket wont turn to goo like mine did.
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RV9a Slow(ly) built
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  #5  
Old 10-20-2017, 09:53 PM
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mfleming mfleming is offline
 
Join Date: Sep 2016
Location: Joseph, Oregon
Posts: 798
Thumbs up

Quote:
Originally Posted by Beancounter View Post
I will keep my fingers crossed for you too, that the cork gasket wont turn to goo like mine did.
Van's and Synergy recommend eliminating the cork gasket and just using sealer now.
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Michael Fleming
Joseph, OR
sagriver at icloud dot com

RV-7 Slider #74572
Started 11/2016
Empennage completed 11/2016 (sans fiberglass)
Ailerons and flaps completed 3/2017.
Wings completed 12/2017
Started on QB fuselage 01/2018
Sliding canopy mostly completed 10/2020
Wiring and Avionics harness completed 9/2/2021
FWF Started 9/3/2021

Donated for 2021 and so should you
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  #6  
Old 10-20-2017, 09:57 PM
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mfleming mfleming is offline
 
Join Date: Sep 2016
Location: Joseph, Oregon
Posts: 798
Smile Second Tank Passed

Completed my initial leak check on my second tank today...Passed.

Tomorrow I'll seal up the end plates, let them cure for a couple of days and then do a final leak check on the tanks.


Using leak detection fluid to track down any leaks.

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Michael Fleming
Joseph, OR
sagriver at icloud dot com

RV-7 Slider #74572
Started 11/2016
Empennage completed 11/2016 (sans fiberglass)
Ailerons and flaps completed 3/2017.
Wings completed 12/2017
Started on QB fuselage 01/2018
Sliding canopy mostly completed 10/2020
Wiring and Avionics harness completed 9/2/2021
FWF Started 9/3/2021

Donated for 2021 and so should you
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  #7  
Old 10-21-2017, 09:03 AM
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jcarne jcarne is offline
 
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Great news!
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  #8  
Old 10-23-2017, 01:21 PM
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Draker Draker is offline
 
Join Date: Jun 2016
Location: Livermore, CA
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Quote:
Originally Posted by mfleming View Post
Van's and Synergy recommend eliminating the cork gasket and just using sealer now.
Did Van's post anything publicly to that effect? I'm getting close to closing my tanks up and am still going back and forth on "cork + Permatex" vs "cork + Proseal" vs. just Proseal.
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  #9  
Old 10-23-2017, 05:17 PM
RV74ME RV74ME is offline
 
Join Date: Dec 2015
Location: Auburn, AL
Posts: 239
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When i took the factory tour, the guy there told me to toss the cork gasket as far as i could!!
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  #10  
Old 06-11-2020, 11:52 AM
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mfleming mfleming is offline
 
Join Date: Sep 2016
Location: Joseph, Oregon
Posts: 798
Wink For The Historical Record

I realized that I never really finished this thread.

So after both tanks passing the initial leak test I removed the cork gaskets and installed the plates with just pro seal.

After letting the tanks cure for at least two weeks, I retested using the same procedure. Both tanks passed the leak tests.

Procedure used for testing tanks:
  1. Closed or sealed up all tank openings
  2. Installed a 0 to 15 inches of water pressure gauge on the tank drain fitting.
  3. Set up a temp probe next to the tank.
  4. Pressured up tank to 9 inches of water.
  5. Recorded the pressure and temperature every 30 minutes to an hour for over 12 hours.
  6. Used leak test fluid periodically to look for leaks. (SNOOP or equivalent)
  7. Let sit overnight, continued recording temp and pressure for another 12 hrs.
  8. Ended test

The pressure / temp recording allowed me to track the pressure movements (and they will move) during the 24 hr test. The method for making sense of the pressure fluctuations is:

Pressure fall and temp falls = normal contraction of air volume.
Pressure rises and temp rises = normal expansion of air volume.
Pressure falls and temp stays the same or rises = possible leak
Pressure stays the same and temps rise = possible leak
Pressure increases and the temp falls = laws of physics ceased working
__________________
Michael Fleming
Joseph, OR
sagriver at icloud dot com

RV-7 Slider #74572
Started 11/2016
Empennage completed 11/2016 (sans fiberglass)
Ailerons and flaps completed 3/2017.
Wings completed 12/2017
Started on QB fuselage 01/2018
Sliding canopy mostly completed 10/2020
Wiring and Avionics harness completed 9/2/2021
FWF Started 9/3/2021

Donated for 2021 and so should you

Last edited by mfleming : 06-11-2020 at 11:55 AM.
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