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In this case medium means the product stored in the tank.

Glad you figured this out for yourself. I like to use cell names as it makes the formulas easier to read when things go wrong. I also prefer to convert degrees to radians only once (column C) and then use that for my sin and cos calcs. As for the "maximum" values I think it's just a...

What's to show? The formulas are in Roark's and give the numbers in the example. If Struct123ure posts their file I'll be happy to review it.

This looked like fun so I did it quickly in Excel. Used the tabulated coefficients from Table 9.4 Case 1f for end values and the formulas from Case 1 for Mx and Tx. For x = 37.59° I get Tx = 13,101 in lb. For x = 130.90° I get Tx = -8,790 in lb. For x = 60° I get Tx = 8,336 in lb. I also...

I have not played with the equations, however I wonder if you've interpreted <x-60°>0 correctly? It is a step function as explained on page 131, and has a value of either 0, 1 or undefined.

I don't like API's method of expressing anchor bolt loads. Using tb = U/N leads to a misunderstanding of what's going on. Please think of tb as the formulas in Table 5.21 with "divided by N" added throughout each one. Thus for the seismic moment the first term becomes 4M/(ND). If you take a...

I assume the hashing is a screen to keep workers from entering. Certainly that is not a shape permitted by the tank codes I'm familiar with. API 650 has a "diamond" repad, but all the corners have big radii. However , taking note of the fact the tanks have been in service for 40 to 60 years...

Sketches or photos ??

API 650 is for the construction of new tanks and thus is not applicable API 653 Section 10 addresses dismantling and reconstruction of an existing tank. Section 12 addresses the required NDE.

I assume this is a flush-type cleanout (FTCO) fitting per API 650 Clause 5.7.7. I find the easiest source for the FTCO dimensions and thicknesses are Tables 5.9 and 5.10. They list the required uncorroded thickness, so if corrosion has reduced it below this value it must be repaired. I would...

Use 1". This limit is repeated in Table 5.10b Notes b thru e. I note that Table 5.10b for a 8"x16" is 1/2" up through a 72' design liquid level. How would you get 1.2" for tbr on this opening size?

A space elevator was the basis of a novel by Arthur C Clarke (Wikipedia) in 1979. He had the advantage of been able to use "continuous pseudo-one-dimensional diamond crystal" for the cable without the difficulty of actually creating said material.

Let's look at the ratio of the values. RMW / MW = 1203820 / 100318 = 12. It appears RMW is in.lbs whereas MW is ft.lbs. However that doesn't match Annex F, neither for the units nor the variable names. You should be sending your model to Hexagon asking them your questions.

If you have an unrelated question you need to start a new thread. Or a simple search of the existing threads would likely find you the answer.

I have never used TANKS, but I would hope that somewhere earlier in the output it notes it's going to use Annex F and why.

Overly simplistic thought process A typical stainless steel (say 316) has a yield of about 30 ksi. Converting this to strain S/E = 30ksi/30,000ksi gives 0.001 in/in, or 0.1%. However that's a circumferential strain limit, so we should convert to a radial growth limit, which would be 0.1%/2pi =...

What is your roof corrosion allowance? As noted at the top of your screenshot the corroded weight is used. I would NEVER recommend ignoring error or warning messages. What you should do is understand what Code rules have made TANK feel Annex F is applicable. Once you understand this you will...

5.10.5 calculates the area required when the junction is in tension due to the self-supporting roof self-weight and other loads (live, snow, etc). F.5.1 calculates the area required when the junction is in compression due to the internal pressure. If you have a self-supporting roof with internal...

And maybe I read too quickly. I thought I read a couple of times, but now I understand properly. Sounds like you're on the right track.

I'm assuming this is a pressure vessel registered in BC. Your post doesn't give any indication of the vessel size, or how big an opening you're cutting out. I'll assume a reasonably big vessel since you mention 1" plate. You should contact Technical Safety BC (TSBC) to be certain of their...