Pipeline pipes
Pipeline pipes
(OP)
Hi,
I have a question:
which grade of API 5L chose for pipelines? and why?
I've heard 5L grade B is not applicable for pipelines, is this expression true?
Best Regards,
I have a question:
which grade of API 5L chose for pipelines? and why?
I've heard 5L grade B is not applicable for pipelines, is this expression true?
Best Regards,





RE: Pipeline pipes
David Simpson, PE
MuleShoe Engineering
Law is the common force organized to act as an obstacle of injustice Frédéric Bastiat
RE: Pipeline pipes
I hate Windowz 8!!!!
RE: Pipeline pipes
David Simpson, PE
MuleShoe Engineering
Law is the common force organized to act as an obstacle of injustice Frédéric Bastiat
RE: Pipeline pipes
I hate Windowz 8!!!!
RE: Pipeline pipes
5L grade B , or L245 as it's now known, is a fine grade and essentially the lowest that you will find in most pipelines. It is just that you can now get L450 (X65) for not much more per tonne, but results in just over half the wall thickness / weight so for higher diameters and higher pressures has become the defacto "standard" for many longer distance pipelines.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Pipeline pipes
RE: Pipeline pipes
I hate Windowz 8!!!!
RE: Pipeline pipes
In addition to the point BI makes, i.e. if you design it correctly all grades have a similar ability to withstand over pressure as the lower grade material should be thicker than the higher grade. In fact the opposite is true from your supposition as the difference between SMYS and UTS tends to narrow as the grade / strength increases such that some high grade pipeline steels have a ratio of UTS to SMYS above 0.9, whereas for the lower grade steels it is closer to 0.8, thus you actually have more ultimate strength in the lower grade steel.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Pipeline pipes
RE: Pipeline pipes
I hate Windowz 8!!!!