Geoff
The simple answer is the B31 Code itself and the way the query was
posted - note reference to the use of "calculator".
Then Consider b31.3 para 304 equation 3(a) - no mention
of "fatigue analysis, surge analysis to determine the actual design
pressure that you have selected a pipe for, the bending stresses
based on how you will support the pipe, earthquake, wind, vibration,
impact loads, concentrated loads, local buckling, corrosion, how the
stuff is going to be joined together etc etc." as you have stated.
Heck if it its more, then you need more than a calculator to work
out the numbers.
Tomcruz
- In PipingDesign@yahoogroups.com, Geoff Stone DD&D Australia
<blenrayaust@y...> wrote:
>
> Tom,
>
> How do you know if it is needed or not? The Code requires that
you determine it. It doesnt say "if you are having a bad hair day
just calculate the wall thickness and everything will be OK". Indeed
unless you calculate it or test for it your knowledge is meagre and
unsatisfactory. Check out Lord Kelvins Quote below.
>
> Geoff
>
> "In physical science the first essential step in the
direction of learning any subject is to find principles of numerical
reckoning and practicable methods for measuring some quality
connected with it. I often say that when you can measure what you
are speaking about, and express it in numbers, you know something
about it; but when you cannot measure it, when you cannot express it
in numbers, your knowledge is of a meagre and unsatisfactory kind;
it may be the beginning of knowledge, but you have scarcely in your
thoughts advanced to the state of Science, whatever the matter may
be."
> Lord Kelvin [PLA, 1883-05-03]"
>
>
>
> tomcruz55 <tomcruz55@y...> wrote:
> Geoff,
> You don't really need all this stuff if all you need is the number
> for the pipe wall thickness. OK let us say you want a stress
> analysis on a pipe - plus you thrown in some other goodies. If you
> don't have the right software, the analysis is still possible (to
a
> certain degree) using graphs/charts, tables and some elementary
> strength equation granting you have a working knowledge of the B31
> Code and granting you are aware of the process environment â and
as
> long as youre willing to accept a certain margin of error. How far
> off? Well it depends but normally the result is pretty much within
> acceptable range.
>
>
> tomcruz55
>
>
> --- In PipingDesign@yahoogroups.com, Geoff Stone DD&D Australia
> <blenrayaust@y...> wrote:
> >
> > You may also want to consider fatigue analysis, surge analysis
to
> determine the actual design pressure that you have selected a pipe
> for, the bending stresses based on how you will support the pipe,
> earthquake, wind, vibration, impact loads, concentrated loads,
local
> buckling, corrosion, how the stuff is going to be joined together
> etc etc. Hey, you might want to become a piping engineer.
> >
>
>
>
>
>
>
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Received on Wed Dec 21 03:23:00 2005