Pipe length
Pipe length
(OP)
HI there,
I don't know if I am posting in the right section, nevertheless it seems to me the most suitable.
I am facing to following problem:
I'd like to know if exists a formula to calculate the original length of a bent pipe.
In this pipe are known:
- length of all straight parts
- pipe diameter
- pipe thickness
- bending angle (ex 30°)
- pipe material
I would suppose that bending would determine a change in pipe length.
What I am expecting is to get a formula that will give me a length as a function of known data.
Please, has anybody of you faced to this problem or could kindly suggest me some useful literature or link ?
Many thanks
I don't know if I am posting in the right section, nevertheless it seems to me the most suitable.
I am facing to following problem:
I'd like to know if exists a formula to calculate the original length of a bent pipe.
In this pipe are known:
- length of all straight parts
- pipe diameter
- pipe thickness
- bending angle (ex 30°)
- pipe material
I would suppose that bending would determine a change in pipe length.
What I am expecting is to get a formula that will give me a length as a function of known data.
Please, has anybody of you faced to this problem or could kindly suggest me some useful literature or link ?
Many thanks





RE: Pipe length
Given that, just figure the total length of pipe along the centerline. That will get you pretty close to the developed length.
Mike Halloran
Pembroke Pines, FL, USA
RE: Pipe length
Otherwise, basic geometry should get you close enough. CRC's Standard Math Tables is a handy reference, but it's just the circumference of a circle that you're looking for.
- Steve Perry
RE: Pipe length
It is easiest to calculate the center line length (measure the straight "tangents", measure the bend radius and use the circumference of a circle over your 30[°], then add the bits together. The outside length will be longer by difference in circumference with a radius = cl radius + 1/2 pipe OD.
David
RE: Pipe length
**********************
"Being GREEN isn't easy" ..Kermit
http://www.youtube.com/watch?v=hpiIWMWWVco
http://virtualpipeline.spaces.live.com/
RE: Pipe length
Would that be negative 1 foot?
jt
RE: Pipe length
**********************
"Being GREEN isn't easy" ..Kermit
http://www.youtube.com/watch?v=hpiIWMWWVco
http://virtualpipeline.spaces.live.com/
RE: Pipe length
You are perfectly right, I need bend radius.
Concerning material, do you think that bending can determine some changes with respect of calculated length ?
I would suppose that is the pipe is bend, some elongation will appear.
Please, what do you think about it ?
RE: Pipe length
David
RE: Pipe length
Effective length of pipe for flow calc's doesn't change either. That is, actual catalog flow data for a short radius fitting, or long radius fitting (true elbow), will be significantly different from those for an extremely long bend radius "pipe" like for a spray manifold or around a tank wall.
If you have fittings, use those values. If you have "long bent pipe" use the (approximate) values you get from calc's based on centerline length.
RE: Pipe length
RE: Pipe length
Reference you are looking for:
PFï standard ES-24
PIPE BENDING METHODS,TOLERANCES,PROCESS AND MATERIAL REQUIREMENTS
Also, due a advance serch in Eng-Tips.com for PIPE BENDING METHODS
RE: Pipe length
**********************
"Being GREEN isn't easy" ..Kermit
http://www.youtube.com/watch?v=hpiIWMWWVco
http://virtualpipeline.spaces.live.com/
RE: Pipe length
"Mechanical Pipe Bending and Physical Pipe Bending Effects
Like any cold or hot working process, bending pipe and tube alters the mechanical properties of the original material. After cold forming, yield and tensile strengths may rise approximately 10 percent; elongation may decrease approximately 15 percent. Bending of pipe and tube can distort the cross section. This depends on the quality of the pipe bending machine tooling, the difficulty of the pipe bend and the experience of the pipe bender. The greater the radius, the less the resulting distortion; the tighter the radius, the greater the distortion. The inner wall of the pipe bend undergoes compression that thickens the wall. Excessive compression, in the worst case, can fold the material causing wrinkles or waves. The outer bend wall undergoes tension that thins the back wall. These same forces tend to make a round pipe oval, with the widest dimension of the oval transverse to the plane of the bend."