Re: Wind Loads

I think it would be safer to try W and NE and possibly a more critical direction as well. Since 10% of the time the direction could be anything, I would take worse case direction. Sometimes one can easily tell what direction is more critical for wind by just looking at the model. If you cannot, you may try X and Z (assuming Y is vertical) directions and use worse wind case out of these.

It is true that the probability of wind blowing at that speed for a more critical direction, other than W or NE could be lower, but if you cannot rule it out or calculate a lower wind speed corresponding to the lower probabilty for that direction, I would rather use the same wind speed for all directions and be conservative.

Regards,
Karim Rinawi

• In PipingDesign@yahoogroups.com, zope_tushar@f... wrote:
  >
  >
  >
  >
  >
  > Friends,
  >
  > In my current project, the average wind direction is west for 60%
  of the
  > year and the direction is N-E for 30% of the year.
  > Avg wind velocity at 10m elevation is 59 m/s. Max line size is 16"
  with
  > 100mm insulation.
  >
  > What is your opinion about the load case for wind?
  > I mean do I have to analyse two separate load cases or just West
  direction
  > case is sufficient.
  >
  > We are already analysing all lines for X and Z direction seismic
  > coefficient of 0.24g (Y being vertical direction)
  >
  > Best Regards.
  >
  > Tushar Zope
  > Extn: 162
  >
  >
  >
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