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03-28-2014, 06:07 PM
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Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,931
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Tank cure before testing
How long did you allow fuel tanks to cure before testing?
The tanks will be done (finally) tomorrow. I don't want to compromise the seal by testing too soon. After the z-brackets are installed, my plan was to put wax paper on the spar and mount them for a few days to allow them to fit before the proseal fully hardens.
When they go on the spar tomorrow it will be 50 till I remove them in the shop. Up to this point they have been inside at 70.
I can move them to the heater control room after but it runs low 90s.
I know temperature, mixing rates, etc. apply. I figure a week after they are removed from the spar should be fine but prefer to hear from others.
__________________
Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 12/03/2019, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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03-28-2014, 07:34 PM
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cure
As long as you're not using B72 (it does exist) a week at above 50f should be OK.
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03-28-2014, 10:03 PM
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Join Date: Mar 2008
Location: Ramona, CA
Posts: 2,367
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I would give it at least several days. As long as the sealant is no longer tacky, the 1psi put into the tank shouldn't blow any of it out.
Don't bother with the balloon. Get some clear vinyl tubing and make a simple manometer "U" shape with some water in the tubing to show that you have positive pressure in the tank. The water will rise and fall with barometric pressure and temp changes. As long as it doesn't go level on each side of the "U", your tanks will be leak free.
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03-29-2014, 10:31 AM
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Join Date: Mar 2007
Location: 45G, Brighton, MI
Posts: 1,867
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Keep a sample of your last batch of sealant in the same environment as the finished tank. When the sample is good and firm, you're good to go.
__________________
Miles (VAF# 1238, Paid up as of 2018)
RV-7 TU 904KM (reserved)
Wings Fitted and Finish Kit on site
Construction Log
Picasa: Empennage Album, Wings Album, Fuselage Album
1955 Cessna 170B flying since 1982
'To get something you never had, you have to do something you never did.' -Unk.
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03-29-2014, 07:20 PM
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Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,931
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Idea
Quote:
Originally Posted by longranger
Keep a sample of your last batch of sealant in the same environment as the finished tank. When the sample is good and firm, you're good to go.
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Great idea.
I just finished the baffle and z-brackets and mounted them on the wax paper covered spar.
They fit perfect.
Thanks for all the advise. Much appreciated.
__________________
Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 12/03/2019, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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03-29-2014, 07:51 PM
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Join Date: Mar 2005
Location: DVT Phoenix
Posts: 1,187
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Quote:
Originally Posted by wirejock
How long did you allow fuel tanks to cure before testing?
The tanks will be done (finally) tomorrow. I don't want to compromise the seal by testing too soon. After the z-brackets are installed, my plan was to put wax paper on the spar and mount them for a few days to allow them to fit before the proseal fully hardens.
When they go on the spar tomorrow it will be 50 till I remove them in the shop. Up to this point they have been inside at 70.
I can move them to the heater control room after but it runs low 90s.
I know temperature, mixing rates, etc. apply. I figure a week after they are removed from the spar should be fine but prefer to hear from others.
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The manufacture of the tank sealant told me some years ago that when you can touch it and not leave a finger print, you are good to go. worked for me. Larry |
03-30-2014, 07:30 AM
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Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,931
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Fingerprint
Quote:
Originally Posted by LARCO
The manufacture of the tank sealant told me some years ago that when you can touch it and not leave a finger print, you are good to go. worked for me. Larry
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Thanks Larry
I will double check with the fingerprint.
__________________
Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 12/03/2019, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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