Formula to calculate wt in equation (E.6.2.1.1.1-2).

[TheEverest]

I found that the formula given in this equation is not exactly used in several examples. Can anyone please help me?

 

[Geoff13]

The formulas above are identical. You need to pay attention to the difference between capital W loads and small w loads.

 

[HTURKAK]

Look to the E.2.2 NOTATIONS

wt =Tank and roof weight acting at base of shell, N/m (lbf/ft)

Ws =Total weight of tank shell and appurtenances, N (lbf)

wrs= Roof load acting on the shell, including 10% of the specified snow load N/m (lbf/ft)

Wrs =Roof load acting on the tank shell including 10% of the roof design snow load, N (lbf)

In your case Wrs = 11444 lbf , and wrs = Wrs /πD apparently, the roof is self-supporting roof. In case of column supported roof , Roof load acting on the tank shell will be calculated with tributary area.

For example if center supported roof, the load acting on the shell will be, Wrs =11444 *(31.16**2 -15.58**2)/(31.16**2)= 0.75* 11444
and wrs =(0.75* 11444)/(pi*31.16)

 

[TheEverest]

Thank you guys for your help and support.