sa-333 impacts
sa-333 impacts
(OP)
if the the impact sample is subsize, and less than 80% of actual wall thk a reduction in temp is needed my quaestion is
Would the nominal wall be used for the calc or can the wall be measured.
If i use the nominal it less than 80% if i use the low end of the wall thickness its within.(is that stretching the intent of the code?)
But how do i know if the impact sample was at the right temp if i dont know what the pipe wall was measured.
Or do i use the sch nominal thickness.
Im not confident aBOUT THIS MANUFACTURER.
mdk
Would the nominal wall be used for the calc or can the wall be measured.
If i use the nominal it less than 80% if i use the low end of the wall thickness its within.(is that stretching the intent of the code?)
But how do i know if the impact sample was at the right temp if i dont know what the pipe wall was measured.
Or do i use the sch nominal thickness.
Im not confident aBOUT THIS MANUFACTURER.
mdk





RE: sa-333 impacts
This has nothing to do with nominal versus actual wall of the pipe. If the impact specimens cannot be machined to full size, they must be considered subsize and temperature reduction is required to compensate.
RE: sa-333 impacts
the reason i imagine is to cbetter represent the material properties.
Am i wrong in my application of SA-333
RE: sa-333 impacts
5" xxs
SA-333 seamless pipe
Impact size is .394 x .295
the temp was -45c
as i was reviewing my MTRs i noticed this.
i think the temp of these impact temps should have been -48c
Now from the same manufacturer i got another load of 4" pipe wall .281 with the same heat#
the 4" pipe had .394x.295 but the wall thickness is only .281?
I dont feel good about this pipe.
What do you think
RE: sa-333 impacts
RE: sa-333 impacts
RE: sa-333 impacts
if the wall measured at the low end of the spec it would have been above the 80% but no one knows what the measured piece was to begin with.
Do you see my delema? Would any even atempt to question it, but most of all are the MTRs correct.
RE: sa-333 impacts
look at this cert at the charpy size. I will speak with the AI on this, but i like to fully review and question everything before i consult the AI.
I seems strange that the MTR doesnt give all the infomation to veriy results and method.
RE: sa-333 impacts
Sir could you give more detail on this?
RE: sa-333 impacts
thread330-67956: Lower impact temperatures for higher thickness of Base material
and then move on to a search using both the terms "plane strain" and "Charpy"
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04