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Wind Design Speeds and Pressure and Refinery

Wind Design Speeds and Pressure and Refinery

Wind Design Speeds and Pressure and Refinery

(OP)
Does anyone have a recommended wind speed and pressure ( psf ) for refinery piping and/or instrumentation?  I have a large gas analyzer ( 300 lbs. ) that is going to be mounted on process pipes as high as 150 feet.  It sits on a valve/flange and I'd like to verify the design using real numbers.  Thanks.

RE: Wind Design Speeds and Pressure and Refinery

The wind speed and the resulting pressure on the item are governed by:

1) Your location...obtain a reference such as ASCE 7 or other appropriate structural loading code having an isotach
2) The appropriate factors such as height of placement of the item and its shape
3) Load combinations that produce the most stringent requirements for the design case.  These will include dead load, live load, wind load, snow load, and seismic load.  Further, the wind load must be computed in several different directions and uplift could be important, though with your description of the part, it isn't likely that uplift is a big deal.

RE: Wind Design Speeds and Pressure and Refinery

(OP)
Thanks for responding so quickly.  I have all the desing data you stated I needed except  the ASCE 7.  Basically what I'm trying to find out is if there exists a Spec. or table, etc. that give guidlines for wind speed and pressures of equipment mounted on piping/at refineries to give me some idea of what the loads will be.  The wind speed hasn't been so difficult to determine but the pressure ( psfg ) has.

RE: Wind Design Speeds and Pressure and Refinery

In the tables in ASCE 7, the factors for round tanks, chimneys, etc. range from about 0.7 to 1.2.  If you use 1.2 or even 1.25, you should be ok.

F/A=qCfGz, where q=basic wind pressure
Cf=shape coefficient, and Gz=gust response factor, depending on height.  For anything over 100 feet, use 1.15.
A=projected area F=force....wind pressure=F/A

This is rough but conservative.

RE: Wind Design Speeds and Pressure and Refinery


This is a sample step by step to calculate pressure on a glazed railing.

These calculations use American Society of Civil Engineers Standard 7-93, Minimum Design Loads for Other Structures to compute wind pressures on the  railing for 160' heigh building located along the shoreline.  
General Notes:
Category = 1 as per table 1 on page 2
Exposure = D as per section 4 on page 14
Use Table 4 with F=qz GZ Cf Af  to calculate the force on the railing
qz  is given in section 6.5 page 11
GZ is given in table 8
Cf is given in table 13 (The railing was assuned to be a solid sign)
Af projected area normar to wind (The area of glass Panel 39"x36" = 10SF)
Divide the force F calculated above by the area of the glass panel to obtain the designed pressure of the railing P(lb/sf)

Just follow these steps to design for the load on your analyzer.

RE: Wind Design Speeds and Pressure and Refinery

Is there a spreadsheet calculator available to determine negative wind uplift pressure for roofing applications which conform to ACSE 7-93?

RE: Wind Design Speeds and Pressure and Refinery

TJMC:

Check out this site: http://mecaconsulting.com.

They have several Excel spreadsheets driven by Visual Basic macros that really take the curse out of calculating those coefficients.

http://www.spiraleng.com
If you wish to visit my website, we can discuss these or other issues further.

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