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Is it possible in Compress to maintain a 2" gap between the weld of Ear lug and Top Head-Shell Circumferential Weld Line ?

I found out that the formula for Uplift Load Cases in Table 5.20b is different in the 13th edition from that of the 12th edition. Also, W1, W2, and W3 are defined differently in the 13th edition. Will it make a huge difference if we follow the 12th edition rather than the 13th edition in this...

IFRs, The dip tube directs the acid into the tank shell. I prefer using a blind over the nozzle's flange and above this blind, create a hole for insertion of the dip tube's nozzle neck, but for this purpose, what shall be the requirements to be fulfilled as per API 650?

The top one is dip-tube and is used for inlet of acid.

Dear all, What are the code sections that are to be referred to in order to add Nozzles on top of another nozzle ?

Why corrosion allowance(CA) is not added in the calculation of hydrostatic test shell thickness(t_t) in the given formula in 5.6.3.2?

In Section V.8.2.2.4, how do we calculate the actual moment of inertia of the intermediate stiffener region I_act? Is there any formula?

How do we calculate Maximum Allowable Internal Pressure due to shell?

How do we calculate exact value of 'Le' in Figure F.2? I found that the maximum value of 'Le' could be 250/(Fy)^0.5 mm or 3000/(Fy)^0.5 inch. But could not find the exact formula to calculate 'Le'.

HTURKAK, Thank you for your reply.

In 5.7.8.1(b), two stresses are to be compared. Is there any empirical formula to calculate those stresses namely: meridional membrane stress and circumferential design stress?

Thank you HTURKAK. I am trying to build up my own spreadsheet for the overall API 650 calculation. And I come across several confusions, so I was hoping to get some genuine example problems so that I could clear my doubts as well as verify my work.

Thank you for your replies guys. These replies mean a lot to me.

Thank you HTURKAK for the reply. Yes, JStephen, I was referring to Seismic Hoop Stresses in Annex E, and I was wondering if the shell thickness is directly calculated because I found an example problem where thickness due to Seismic calculations was written separately. Since the example problem...

In a Pressure Vessel Handbook by Megyesy, I found a formula to calculate the thickness of the shell by using a Maximum seismic moment at the base of the tower. But in API 650, I could not find the exact formula to calculate the minimum thickness of the shell by using seismic calculation (or...

How do we calculate thickness of shell according to One Foot Method (5.6.3), if Joint Efficiency of 0.85 is given? Can anyone please help me?

JStephen, Thank you for your response. According to API 650 section 5.12.6, "An acceptable procedure for anchor chair design is given in AISI Steel Plate Engineering Data, Volume 2, Part 5, Anchor Bolt Chairs.” So, I referred to this specific book and found that the maximum recommended stress...

After calculating S (for the top plate) from equation (7-1) and S(for chair height) from equation (7-3), what shall we compare them with? Do both of them need to be less than 25 ksi? (PS: Expecting for some help)

I found two types of formulae used to calculate the Vertical Projected area of Roof. Can anyone please help me out?

Yes, Tc is around 4 and Ks is around 0.6 but I=1.5 and Sd1 = Q*Fv*S1 = 1*1.5*0.5 = 0.75 decimal %g. Is the value of Sd1 incorrect? Also to calculate Delta_S (Sloshing wave height), shall we use 0.42 or 0.5 in the formula?