B31.3 - 304.3.4 Reinforcement of Extruded Outlet Headers 1

[anolan23]

Hello,

It states that hx (height of extruded outlet) must be equal to or greater than rx (radius of curvature). There seems to be a gray area in determining the hx. Can I count the weld as part of the height of extrusion?

Thanks

 

[BigInch]

Only the extruded part, which, practically speaking, is 1/2 the width of the weld.

 

[LittleInch]

NO. When the tee is extruded there is no weld.

I don't see any "gray area", only a clearly drawn diagram and set of notes.

What is not clear about it??

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[anolan23]

if you look at this figure, hx goes above the collar extrusion

 

[LittleInch]

I don't think it does and the description is quite clear. Height of extruded outlet.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[BigInch]

LI, Slow down, have a cup of coffee, read the question well, look at the diagram.
Can he include the weld in determining the height of h[sub]x[/sub]?
I said that he can include 1/2 the weld. (Any discrepency caused by including 1/2 the dimension of the root in the calculation of h[sub]x[/sub] should not be very worrisome.)

 

[anolan23]

Thank y'all for participating so far. BigInch, I was thinking 1/2 the weld as well

 

[anolan23]

Two more things:

-Please look at my attached image of how I'm measuring the radius (I took a picture and used AutoCAD). It is difficult to choose where I start and end my arc that I create to determine my radius. There are multiply radii to choose on a single side. What radius do I pick?

-Do you know of any better extruded outlet radii measuring techniques/tools I could use?

Thank you

 

[BigInch]

measure a and b, they should be roughly equal, if not take the average value for the radius.

 

[anolan23]

Looks more like an ellipse for most extrusions. Would taking the average radius of the ellipse be good practice? The formula is Average Radius(Ellipse)= SQRT((A^2+B^2)/2), where A is the central, horizontal, transverse radius/semi-major axis and B is the central, vertical, conjugate radius/semi-minor axis.