B31.3 inplace of B31.4
B31.3 inplace of B31.4
(OP)
we have a requirement for 18" and 20" ISO 3183 Gr L415, PSL2 (SMLS/LSAW/HFW) however the required length is very small so we want to use B31.3 material.
What major concerns related to material and material testing should be taken care other than mechanical testing requirements (tensile, pressure, thickness etc).
What major concerns related to material and material testing should be taken care other than mechanical testing requirements (tensile, pressure, thickness etc).
Nickypaliwal
Materials & Corrosion Engineer





RE: B31.3 inplace of B31.4
Which material did you mean.??
The pipe doesn't care which code it is being designed to, but a lower strength material ( say A105) will require thicker pipe than your L415 (X60) material.
you are concerned about ductility, low temp strength and weldability.
you can do a comparison between the material specs when you know what the material is you're trying to buy.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: B31.3 inplace of B31.4
You wrote:
"however the required length is very small so we want to use B31.3 material."
1, How small is very small
2, What is upstream and what is downstream of very small?
3, Can you provide a sketch?
Sometimes its possible to do all the right things and still get bad results
RE: B31.3 inplace of B31.4
RE: B31.3 inplace of B31.4
David Simpson, PE
MuleShoe Engineering
In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. Galileo Galilei, Italian Physicist
RE: B31.3 inplace of B31.4
For a materials and corrosion engineer to refer to something as vague as "B31.3 material" compared to the detailed description of the line pipe is a little worrying....
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: B31.3 inplace of B31.4
David Simpson, PE
MuleShoe Engineering
In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. Galileo Galilei, Italian Physicist
RE: B31.3 inplace of B31.4
You have not had time yet to respond to the people who have asked questions or offered comments. You, no doubt are very busy.
-
However here are some added questions to my original list:
4. Where are you, what City? and what Country?
5. Where is this project, Onshore? Off Shore? Inside the fence? outside the fence? Near what City? and What Country?
6. What is the Commodity?
7. What is the purpose of this line?
Sometimes its possible to do all the right things and still get bad results
RE: B31.3 inplace of B31.4
Use of B31.3 pipe might be considered only if B31.3 resulted in thicker pipe than that required by B31.4, so conditional use of B31.3 would have to result in at least a thickness equal to that for B31.4, but most likely even thicker.
B31.4 has never, never, ever had class locations.
Reaction to change doesn't stop it
RE: B31.3 inplace of B31.4
ISO 3183 is derived from API 5L so there would be other pipe grades listed in 3183 that may be easier to source.
Material has to be listed in your design code for you to use it. There would be rules on using non listed materials.
RE: B31.3 inplace of B31.4
Piping that we plan to use is - A106 GrB.
Location is Oman. The length of pipe required is 24m and 12m for 20" and 18" respectively.
The service is hydrocarbon and the area is not far from main station.
Sketch and other details are still to be looked upon however the understanding that we have is to compare the high level requirements in both the codes related to material testing and composition restrictions, so that a learned decision can be made. We plan to ask for the possible testing and assess risk to accept the piping material.
I might have missed to answer many of above queries which I can answer once I start with the detailed study of the matter.
Nickypaliwal
Materials & Corrosion Engineer
RE: B31.3 inplace of B31.4
RE: B31.3 inplace of B31.4
The mechanical property side of things will be straightforward; it's the NDT that will get problematic.
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: B31.3 inplace of B31.4
ASME B31.4 section 423 specifies what you need to do.
Although you might not need the low temperature requirements, A333 is typically available from stockists as is A106, both of them listed in the table in B 31.4 table 423.1.1. as allowable materials.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: B31.3 inplace of B31.4
Nickypaliwal
Materials & Corrosion Engineer