Re: pIPING THICKNESS CALCULATOR

Its easy. The piping spec has already tabulated the pipe thickness required based on load worst case condition for its service. It also specify the material, the T&I and lots of other stuff to make the piping not only works but its safe.

So in a lot of cases, the piping engineer focuses on the critcal few. And what are thse critical few - piping that are condisered as safety and production critical and normally they are but 30 percent of the total pipe run in the whole plant.

The reason im saying that in a grassroot project, not all piping have a calcs attached to it. There are thousand of piping iso floating around in a major power plant, refinery or petrochem - the reason why the focus is on the critical few. The OSHA realises this and so does the API.

• In PipingDesign@yahoogroups.com, Geoff Stone DD&D Australia <blenrayaust@...> 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@...> 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 – 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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