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Piping Code Cross Referencing and LT Fracture.

Piping Code Cross Referencing and LT Fracture.

Piping Code Cross Referencing and LT Fracture.

(OP)
Does asme B31.3 Table 323.2.2 A have any duristriction on pipeline codes ASME B31.4, B31.8 and PD810-2 (Above water at a B31.3 Interface) ?

Ref PD8010-2
Thought (at this moment) is on using a X65 (for strength) material with a -46 Deg Centigrade and 250 Bar g Design.
Probably be a Thick Cylinder calc but the above from the past (B31.3)reminds me of possible Brittle Fracture and needs be investigated.

Where in PD8010-2 or reference is any of the above covered ?

Really Appreciate some pointers.
Thanks in advance
pipestan2

RE: Piping Code Cross Referencing and LT Fracture.

All codes are totally independent up to the point where they reference other codes and standards. However, just because a code does not mention something, doesn't mean that there is no problem, or that some aspect of a design shouldn't be checked. The engineer is the judge of what additional measures must be taken to prove a design, and that is an important aspect of his/her knowledge and experience.

The material must be selected with the appropriate properties for that service temperature and you will want to be sure to require impact testing at that temperature or less.

Independent events are seldomly independent.

RE: Piping Code Cross Referencing and LT Fracture.

Why -46 deg C? Is it because you are looking at a typical Charpy test temperature for A333 Gr6? Design the lower temperature, rather than copy it, particularly for X grades as they struggle to hit acceptance criteria as the temperature lowers. Get a proper blowdown calculation and come up with a realistic minimum design temperature.

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04

All answers are personal opinions only and are in no way connected with any employer.

RE: Piping Code Cross Referencing and LT Fracture.

Nearly forgot - if it's a gas or multiphase pipeline, of some reasonable diameter, you will also be looking at ductile fracture control requirements which could add more onerous Charpy criteria.

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04

All answers are personal opinions only and are in no way connected with any employer.

RE: Piping Code Cross Referencing and LT Fracture.

(OP)
Mamy Thanks Biginch & Steve.

Note, The query is for initial and investigative work.
The Design Temp may get lower which i beleive that something more costly and exotic may be required.
What i am "attempting" is to assess the use a Carbon Steel of a high SMYS (x65) for strength to acheive a min WT that may comply with ASME B31.3 Table 323.2.2 A and therefore use as part of my judgement whilst being PD8010-2 (above water)
compliant. Hopefully i am taking the right track. Again appreciate any pointers in PD8010-2 as a starter.
Incidently sizings could be from 4" to 10"
Hoping that the above is not as clear as mud.

thanks

Pipestan2

RE: Piping Code Cross Referencing and LT Fracture.

If the thrust of your argument is to try and avoid Charpy testing, the answer is no - see PD 8010-2, 8.2.5. You will also need to deal with running shear fracture if the fluid is Cat C, D, or E.

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04

All answers are personal opinions only and are in no way connected with any employer.

RE: Piping Code Cross Referencing and LT Fracture.

(OP)
Steve,

Just wanting to make sure that everything is correct and procedures "safely followed".
It certainly looks like Fracture Mechanics is going to play the part and will touch base with our Process & Metallurgists
to review my findings when back at work tommorrow
One final question tho ', in your Opinion, Is ASME B31.3 Table A pertinent to our P88010-2 discussion ?

Kind Regards

Pipestan.

RE: Piping Code Cross Referencing and LT Fracture.

It's the classic piping - pipeline interface question: why design a pipeline and do all the mechanical, fracture, and nondestructive testing etc, and then connect it to piping that seems to do away with testing wherever it can? However, codes are codes, and PD 8010 does not give you the option to invoke B31.3 as a 'get out.' The linepipe of the pipeline must be Charpy tested during manufacture (where dimensions allow), that is a given. I know of two European supermajor operators who would not even use Table A for their piping, let alone pipelines, having developed more stringent fracture control requirements.

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04

All answers are personal opinions only and are in no way connected with any employer.

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