Re: Tank Fitting Question


Jim Patillo
 

I agree with Jay. I used phenolic for my 3/8” stainless fuel line connections in the header tank.
22 years, works fine. 

Jim Patillo
N46JP - Q200
Almost 1900 hours on my Q. 

From: main@Q-List.groups.io <main@Q-List.groups.io> on behalf of Jay Scheevel <jay@...>
Sent: Wednesday, September 14, 2022 7:45:14 AM
To: main@Q-List.groups.io <main@Q-List.groups.io>
Subject: Re: [Q-List] Tank Fitting Question
 

Here is an example.  It is not exactly the same function as you are after, but it is an example of use of phenolic. I have been using this for 4 years without a hint of a problem. See page 10 of the following document: http://n8wq.scheevel.com/documents/build_logs/09_N8WQ-log_Construction-FuelTanks.pdf

 

Cheers,

Jay

 

From: main@Q-List.groups.io <main@Q-List.groups.io> On Behalf Of Jay Scheevel
Sent: Wednesday, September 14, 2022 8:39 AM
To: main@Q-List.groups.io
Subject: Re: [Q-List] Tank Fitting Question

 

Robert,

 

With respect to bonding and durability, I would recommend that you use phenolic instead of aluminum. It bonds perfectly with the tank materials, and it also can be cut and threaded in the same way as aluminum (hole dimension should provide slightly more material than if you are threading aluminum. Sealing compound on the threads will work to perfectly seal the threads. It will not be subject to vibration failure of the bond as would the aluminum, and fittings will be plenty tough and will not leak. You would use the same fittings that you have shown.

 

Cheers,
Jay

 

From: main@Q-List.groups.io <main@Q-List.groups.io> On Behalf Of Anthony P
Sent: Wednesday, September 14, 2022 7:30 AM
To: main@Q-List.groups.io
Subject: Re: [Q-List] Tank Fitting Question

 

That fitting will work.  You need a 37/64" tap drill and I would recommend leaving material in the wall around the hole that is at least half of that diameter.  Closer to a full diameter would be better.
https://drillsandcutters.com/npt-tap-drill-chart/
This is a completely separate issue from bond area needed to permanently attach the Al to the glass/foam given CTE, bond strength, vibration, fitting torque, fitting expansion...


I always try very hard to avoid pipe threads for installation, sealing, and maintenance reasons.
https://www.summitracing.com/parts/sfl-sf92206blk
https://www.hydraulicstore.com/images/pdf/Thread_Identification_Guide.pdf
https://sct-usa.com/wp-content/uploads/2022/01/saej1926r_2022.pdf





--
Q2 N86KL

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