tube to tubesheet expan

[marsich]

Here my problem.
I have to expand the tubes into tubesheet by rolling

Tubesheet: 304L (holes 25.69mm)
Tubes: CuNi 90 10 (dia 25.4mm x wall 0.7 mm)

How much is the percent wall reduction?

We usually use this value:
Diameter of tube hole “df”
Outside diameter of tube “de”
Inside diameter of tube (after expansion)“D”
Inside diameter of tube (before expansion)“di”
Tube wall thinning (%) “T”

Formula D= di + (df – de) + (de – di) x T

TUBES MATERIAL Tmin Tmax
Carbon steel 8 12
Low alloy steel 8 12
Stainless steel 5 8
Al & all base alloy 4 5

Thank you.

 

[Christine74]

8-10% wall thickness reduction is generally used for copper or copper-nickel tubes, although I've seen as high as 12%.

I'm not sure if i agree with your chart. Carbon steel is normally more like 5-8% and aluminum is more like 10-12%, IIRC.

-Christine

 

[marsich]

Where can I find documentation about roller expansion & tube wall reduction?

 

[Christine74]

You can download Elliot Tool's E-100 catalog here:

http://www.elliotttool.com/ttools1.htm

-Christine

 

[marsich]

thank you Christine.