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10-31-2013, 12:12 AM
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Join Date: May 2007
Location: salem Oregon
Posts: 1,023
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Red Cube, Torque values for stainless fuel lines in and out.
Bringing the red cube up for position with both stainless fittings on Bonaco hoses, One hose from the spider and one from servo. In the 43.13 book table 9-2 Par 9-30 page 9-19. Sept 27,2001. My tubing is not steel but rubber with stainless braid stainless nuts and hose end fittings. So what is a builder suppose to do here? Ill take any suggestions. Also did a search and YES THE LAST ENTRY was my same question here. what does the term 2 flat or something like that mean?
Always your thoughts are much appreciated .
Ron in Oregon
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10-31-2013, 06:23 AM
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Join Date: Jun 2012
Location: Frederick, MD
Posts: 819
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Assuming that your end fittings on the flexible hose are SS, and the fitting that you put into the red cube are SS, then use the torque values for steel tubing.
It is the end fitting material that matters- you need to tighten enough to ensure a good seal and adequate preload on the threads to prevent vibration from loosening, but not so much as to damage the threads. SS values are similar enough to steel that it works.
Be careful not to over tighten the adapter fitting (pipe thread) in the red cube or it can lead to a crack in the red cube.
__________________
Dan Morris
Frederick, MD
PA28-140
Hph 304CZ
RV6 built and sold
N199EC RV6A flying
Learn the facts. "Democracy dies in darkness"
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10-31-2013, 06:27 AM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,515
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Flats? Two apartments in London? Both bike tires flat? No. 
A hexagon has 6 sides. Each side is flat. Two flats is 120 degrees. 
__________________
Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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10-31-2013, 06:40 AM
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Join Date: Jul 2009
Location: Mojave
Posts: 4,643
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Be very carefull with SS tube nuts on SS fittings... That stuff galls very easily no matter how much lube you put on it. In high torque applications you may very well just weld it together.
__________________
WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.
Michael Robinson
______________
Harmon Rocket II -SDS EFI
RV-8 - SDS CPI
1940 Taylorcraft BL-65
1984 L39C
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10-31-2013, 06:52 AM
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Join Date: Jun 2012
Location: Frederick, MD
Posts: 819
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SS fittings/lines are common on all turbine engines. No problem with galling unless someone really over torques the fittings. The fittings are passivated.
__________________
Dan Morris
Frederick, MD
PA28-140
Hph 304CZ
RV6 built and sold
N199EC RV6A flying
Learn the facts. "Democracy dies in darkness"
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10-31-2013, 10:06 AM
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Join Date: May 2007
Location: salem Oregon
Posts: 1,023
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You guys are too good! I guess looking at charts or tables there are some variables and better to ask. Again thanks alot, much appreciated. I learned that in a London flat one must be tight knit with the other.!
Ron in Oregon
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10-31-2013, 12:45 PM
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Join Date: May 2007
Location: salem Oregon
Posts: 1,023
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Hello Moderator, please achieve this thread on Stainless torque values
. Best advice. On Stainless fitting and what flats are. Thanks All!
Ron in Oregon
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10-31-2013, 01:20 PM
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Join Date: Jul 2009
Location: Mojave
Posts: 4,643
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Quote:
Originally Posted by RVDan
SS fittings/lines are common on all turbine engines...
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Agreed, and that's exactly where the galled fitting/tube nut sitting on one of our design engineers desk came from. It had to be cut off the airplane.
__________________
WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.
Michael Robinson
______________
Harmon Rocket II -SDS EFI
RV-8 - SDS CPI
1940 Taylorcraft BL-65
1984 L39C
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10-31-2013, 02:23 PM
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Join Date: Jun 2012
Location: Frederick, MD
Posts: 819
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It is really frustrating to go to remove a fitting or bolt or whatever that takes only a limited torque to find it hopelessly over tightened to the point of failure. Images of apes with long arms comes to mind.
Does your organization use the flare seals on the SS lines?
__________________
Dan Morris
Frederick, MD
PA28-140
Hph 304CZ
RV6 built and sold
N199EC RV6A flying
Learn the facts. "Democracy dies in darkness"
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