wind load on horizontal vessel 3

[Someone11]

I have some confusion in how Pv ELITe calculates the wind area.. on vertical vessels it was quite understandable as it multiplies the height of element and the effective wind diameter. But for the horizontal vessel,i followed the procedure given in the Moss but the result didnt match for the head part. My vessel has OD of 96". wind load multiplier 1.2, so the effective dia here becomes 115.2", then the length from top of head upto the tangent would be= 96/4 + 2"(Straight flange length is 2")=26". wind area should have been 26"*115.2" but the answer is way too far from this. Am i missing something? This calculation is for the transverse force on vessel.

 

[r6155]

Why is the head height = 26" not multiplied by the wind factor = 1.2 and the diameter 96" x1.2 = 115.2 "yes?

“wind area should have been 26"*115.2"”
is the semi-elliptical head a rectangle?

Regards

 

[saplanti]

Please note that wind area calculation is approximate and not very significant for the horizontal vessels within the plants. For the approximate calculation you may look at Pressure Vessel Design Manual by Dennis R. Moss, and I guess CAESAR II follows its procedures.