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swing joint (9 Posts)
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swing joint
What you describe can be seen on/as a down-fed header?
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swing joint
I know what a swing joint does. What does it look like? I went through the steam pipe pics and if I saw one, I don't know it.
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It's 2 90 degree elbows joined together. they could make the shape of an "S" or can be swiveled other ways. Normally a pipe going up into a 90, then another 90 attached to it, then the next pipe running horizontally.
Wish I had a picture.
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Swing Joints
Quick Sketch-
The bottom one shows the swing joint in more detail. It is a field-fabricated arrangement as opposed to a purchased item.
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there are a couple swing joints :)
the idea is basically to allow expansion and contraction stress...
in a way you can think of them as shock absorbers....
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swing joint
Got it! Thanks guys!!
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12\" min. on eq.
Brad, in your diagram, you show the equilizer with a 90* ell in it. In the drawing you state 12" minimum between the two pipe leading to and away from the 90*. Why is this important?
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Not the same thing, Mike
The detail focus is the swing joint itself and that which I illustrated is the main branch leaving the header. The end-of-main drop certainly could be a swing joint but I would think the extra fittings may make some installations more difficult and turbulent than they would need to be.
The end of the header is just for illustration but should be thought of as a "header-size x 1-1/2" minimum" reducing elbow turned to a 45 drop. I have seen that in photos posted on the site and like how it looks. Not a perfect illustration, I freely admit!
The reason for the 12" minimum is, if less, there is less "give" or flexion in the joint. You definitely go longer....
Picture if you will, if the joints were made with close-nipples or short nipples... the assembly would not flex too well, would it? Expand the minimum distance to 24 inches, 36 inches, what have you. You can then see how that much more pipe would flex far better.
Think of swing joints as hairpins.
The equal leg length is to assure that one will not over-leverage the other. It also allows movement in the X, Y and Z axis.
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Understood
Thanks!!!
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