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tube to tubesheet expan

tube to tubesheet expan

tube to tubesheet expan

(OP)
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.

RE: tube to tubesheet expan

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

RE: tube to tubesheet expan

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

RE: tube to tubesheet expan

(OP)
thank you Christine.

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