Cold Bend 50° for 6” pipeline

[alain0707]

Dear Mates,

Please I need to ask if it is possible to bend a field cold bend angle of 50° for a 6'' x 7,11 mm pipeline.

Regards

 

[LittleInch]

What radius?

But yes, you can.

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

 

[1503-44]

ASME B31.4 and .8 both quote as follows

(b) Except as permitted under para. 406.2.l(c), the
minimum radius of field cold bends shall be as follows:

Minimum Permissible Bend Radius

Nominal Pipe Size : Bend in pipe Diameters
NPS 12 and smaller: 18D
14 : 21
16 : 24
18 : 27
NPS 20 and larger : 30

Bend R = 18D x 6.75" = 121.5"
Bend D = 2 x 121.5 = 243"
Bend Circumference 3.14 x 243" = 763" = 63.6 ft
Bend in Degrees per linear ft of pipe = 360°/63.6 ft = 5.7°/ft length
With 18D radius you can make a 50° Bend in a NPS 6 within a pipe length of around 10ft.

--Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."

 

[LittleInch]

All depends if the bending contractor has 18D shoes... most time I just see a blanket 40D for cold bends regardless of pipe size.

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

 

[alain0707]

the radius is 60D

 

[1503-44]

Then you need more pipe length. You can repeat the same calculation using 60 instead of 18.

--Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."

 

[LittleInch]

So 60D you can make from one length of pipe.

[EDIT] 60D has really quite a lowlong radius / gentle bend.

High strength pipe (X70 or more) might not even bend very well.

Why?

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

 

[1503-44]

You mean quite a long radius.

--Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."

 

[GD2]

Cold bendings set limitations on minimum bend radius (piggability/fibre elongation-18D for NPS 6 per ASME B31.4 in your case), minimum wall thickness (shouldn’t be lesser than 87.5% of the pipe wall thickness) and ovality (8% in ASME 31.3). If welded pipe, longitudinal seam should be as close as possible to the neutral-axis.
Check what construction code you follow and go from there.

GDD
Canada