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carlossa52(at)gmail.com
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 Posted: Wed Oct 29, 2014 7:50 am Post subject: elbow fitting |
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When attaching an elbow fitting (http://www.aircraftspruce.ca/catalog/hapages/an822.php) to a fuel valve (or anything else, for that matter), how can you have it oriented in a particular direction AND ensure it is leak-free?
Carlos
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jaybannist(at)cs.com
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| Posted: Wed Oct 29, 2014 8:28 am Post subject: elbow fitting |
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Carlos, I could not use that fitting.with the Andair fuel selector valve, tighten leak free and get the proper orientation. I eventually used banjo fittings to get the proper orientation. -- Jay
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BARRY CHECK 6
Joined: 15 Mar 2011
Posts: 738
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| Posted: Wed Oct 29, 2014 8:47 am Post subject: elbow fitting |
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Great question Carlos:
Here are some points to follow:
1 - Use a Fuel Proof Thread Sealant. This is especially true when dealing with similar metals being tightened together - Example: Aluminum to Aluminum.
If this is the case then Galling becomes an issue.
2 - Since you are dealing with pipe threads you only need a 3 thread engagement for a seal to be good. So, what you then use is the ADDITIONAL rotation/thread engagement for the lining up.
3 - This part is a bit more difficult and requires lots of additional thought... Replace the NPT with some other type of thread arrangement. Maybe a UNION, or a flair fitting.
Side note: It is always best if you can stay away from 90 Deg bends in a fuel system. Each bend reduces the flow rate and can cause caviation. Smooth round bends are best. Yes, I know when all else fails sometimes you are forced to go the route of 90 deg bends.
Barry
On Wed, Oct 29, 2014 at 11:49 AM, Carlos Sa <carlossa52(at)gmail.com (carlossa52(at)gmail.com)> wrote:
[quote]When attaching an elbow fitting (http://www.aircraftspruce.ca/catalog/hapages/an822.php) to a fuel valve (or anything else, for that matter), how can you have it oriented in a particular direction AND ensure it is leak-free?
Carlos
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carlossa52(at)gmail.com
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| Posted: Wed Oct 29, 2014 9:05 am Post subject: elbow fitting |
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Barry, thanks, that makes sense.
Carlos
On 29 October 2014 12:47, FLYaDIVE <flyadive(at)gmail.com (flyadive(at)gmail.com)> wrote:
[quote]Great question Carlos:
Here are some points to follow:
1 - Use a Fuel Proof Thread Sealant. This is especially true when dealing with similar metals being tightened together - Example: Aluminum to Aluminum.
If this is the case then Galling becomes an issue.Â
2 - Since you are dealing with pipe threads you only need a 3 thread engagement for a seal to be good. So, what you then use is the ADDITIONAL rotation/thread engagement for the lining up.
3 - This part is a bit more difficult and requires lots of additional thought... Replace the NPT with some other type of thread arrangement. Maybe a UNION, or a flair fitting.
Side note:  It is always best if you can stay away from 90 Deg bends in a fuel system. Each bend reduces the flow rate and can cause caviation. Smooth round bends are best. Yes, I know when all else fails sometimes you are forced to go the route of 90 deg bends.
Barry
On Wed, Oct 29, 2014 at 11:49 AM, Carlos Sa <carlossa52(at)gmail.com (carlossa52(at)gmail.com)> wrote:
[b]
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