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API 650 11th Edition Wind Load Shape Factor

API 650 11th Edition Wind Load Shape Factor

API 650 11th Edition Wind Load Shape Factor

(OP)
In the definition for "Wind" (Section 5.2.1.j), is the shape factor already included in the pressure?  For a cylindrical shell, it is typically 0.67.

Also, where does the 18lbf/ft^2 come from... because when I check ASCE 7, I can't find that number anywhere.

RE: API 650 11th Edition Wind Load Shape Factor

API-650 shape factor for cylinder = 0.6.  For cones and spheres = 0.5.  18 psf = 30 psf Flat surface at 120 mph) x 0.6 (shape factor.

Joe Tank

RE: API 650 11th Edition Wind Load Shape Factor

The 30 psf/ 18 psf/ 15 psf have been in use for many years in tank standards.  Generally, ASCE 7 will give pressures in that range, but they were not derived from ASCE 7.

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