How to Determine Fracture Propogation in Pipe?
How to Determine Fracture Propogation in Pipe?
(OP)
Does anyone know the method of determining the fracture propogation of pipe?
I am trying to determine the resistance to fracture propogation for various grades of pipe. For example, if a pipe fractures under high pressure, what is the propensity for the fracture to continue to adjacent pipes?
Thanks for any help!
I am trying to determine the resistance to fracture propogation for various grades of pipe. For example, if a pipe fractures under high pressure, what is the propensity for the fracture to continue to adjacent pipes?
Thanks for any help!
RE: How to Determine Fracture Propogation in Pipe?
You need to look at a primer for fracture mechanics. Learn about "notch toughness" and critical crack lengths for various materials at various stresses.
Regards, John.
RE: How to Determine Fracture Propogation in Pipe?
RE: How to Determine Fracture Propogation in Pipe?
RE: How to Determine Fracture Propogation in Pipe?
a) a pipeline above 1000 psig (steel)
b) a pipeline operating above 40% SMYS
c) a pipeline with low toughness steel (i.e., highly "brittle")
The analysis is not trivial. It is usually done with tons of statistics. Such as:
1) What is the size and orientation of the maximum defect? At what confidence interval?
2) How many pressure cycles will the pipeline see in it's lifetime (or time until potential failure)
3) Type of fluid and potential energy when under pressure
Good luck. I've started on this in the past and found work-arounds so I didn't have to solve it.
RE: How to Determine Fracture Propogation in Pipe?
Hope this helps.
RE: How to Determine Fracture Propogation in Pipe?
You need British Standard BS7910, which will answer your question.
Regards
John post@gowelding.com www.gowelding.com