Creep Range Carbon Steels B31 Codes
Creep Range Carbon Steels B31 Codes
(OP)
I'll use B31.1-2016 as the example, but my question applies to B31.3 as well.
The start of the creep range in App. A is the temperature before the first italicized stress value. e.g. for A-106B the creep range starts at 650F.
Note 7 in Table 102.4.7 exempts carbon steels from the requirements of para. 102.4.7 and Table 102.4.7. i.e. we do not need to take W (weld strength reduction factor) into account or perform additional volumetric NDT. We believe this is because the pipe will fail due to graphitization and sulphidation before creep. Correct me if I'm wrong.
For a seamless, carbon steel pipe (such as A-106B), what is the purpose of listing the start of the creep range if there is no additional Code Requirement for it? Or is there a Code Requirement that I am overlooking?
The start of the creep range in App. A is the temperature before the first italicized stress value. e.g. for A-106B the creep range starts at 650F.
Note 7 in Table 102.4.7 exempts carbon steels from the requirements of para. 102.4.7 and Table 102.4.7. i.e. we do not need to take W (weld strength reduction factor) into account or perform additional volumetric NDT. We believe this is because the pipe will fail due to graphitization and sulphidation before creep. Correct me if I'm wrong.
For a seamless, carbon steel pipe (such as A-106B), what is the purpose of listing the start of the creep range if there is no additional Code Requirement for it? Or is there a Code Requirement that I am overlooking?





RE: Creep Range Carbon Steels B31 Codes
You seem to have no idea what codes are for. Codes state absolute MINIMUM requirements. If you meet code, there may still be more that you need to do. Should there be additional requirements because of case specific design requirements, or service conditions, etc. YOU ARE RESPONSIBLE FOR KNOWING WHAT WILL BE REQUIRED AND IT IS YOU THAT SHALL SEE TO IT THAT WHATEVER ADDITIONAL MEASURES MAY BE NEEDED TO ENSURE PROPER DESIGN AND PERFORMANCE ARE PROVIDED.
from https://en.wikipedia.org/wiki/Creep_(deformation)
In the creep range the deformation may become so large that a component can no longer perform its function — for example creep of a turbine blade will cause the blade to contact the casing, resulting in the failure of the blade.
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RE: Creep Range Carbon Steels B31 Codes
RE: Creep Range Carbon Steels B31 Codes
So loilfin, do you want to be the inspector, or the engineer? Both will require that you read the code from cover to cover.
Technology is stealing American jobs. Stop H1-Bs for robots.
RE: Creep Range Carbon Steels B31 Codes
Again you are correct except that Inspectors call themselves "Inspection Engineers" now the same way that Bin men call themselves "Domestic Engineers" and Fitter call themselves "Mechanical Engineers". They are all bullshitting themselves and real engineers.
RE: Creep Range Carbon Steels B31 Codes
Technology is stealing American jobs. Stop H1-Bs for robots.
RE: Creep Range Carbon Steels B31 Codes
Yes in the UK. You are correct - there are no pipe fitters/Inspectors/ bin men/car mechanics here any more . They are all engineers which winds me up quite a lot since I studied for a degree yet these people call themselves "engineers". The biggest thorns are Project Engineers. How can you "Engineer" a project - you can't . Most of these Project Engineers are failed ex draughtsmen who jumped on the "Projects" bandwagon because they would never make it to be a proper engineer. It's a complete joke over here. Most of them are what I call Teflon engineers - as soon as one of their decisions starts to go wrong the Teflon shoulder pads are deployed and they walk away as fast as their little legs can carry them.
RE: Creep Range Carbon Steels B31 Codes
Technology is stealing American jobs. Stop H1-Bs for robots.
RE: Creep Range Carbon Steels B31 Codes
Its a strange situation to me where ASME says the creep range starts at 650F, but we will need to use other resources that say it starts at 700F to assess it.
RE: Creep Range Carbon Steels B31 Codes
Technology is stealing American jobs. Stop H1-Bs for robots.
RE: Creep Range Carbon Steels B31 Codes
RE: Creep Range Carbon Steels B31 Codes
Technology is stealing American jobs. Stop H1-Bs for robots.
RE: Creep Range Carbon Steels B31 Codes
RE: Creep Range Carbon Steels B31 Codes
Technology is stealing American jobs. Stop H1-Bs for robots.
RE: Creep Range Carbon Steels B31 Codes
If this is requires a new thread just let me know. Figure we could elaborate on one of OP's previous comments and get some clarity while we're all here.
Thanks,
Ehzin