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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...

As a designer/manufacturer I'm used to the new vessel rules. Interesting to learn what owner/operators have to do. Thanks for the attachment. Good luck.

Have you discussed your plan to get a new CRN with TSASK? Seems very odd to try to get a new CRN for a vessel built 60 years ago. No point doing all this work if TSASK won't allow it. I'm more familiar with chatting with ABSA, but they are always very helpful with unique questions like this...

The first two temps are differential temperatures so the formula is °F / 1.8 = °C. The last is an actual temperature so the formula is (°F - 32) / 1.8 = °C.

If you will be certifying the tank to API 620 I think you'll need to meet 5.20.3. Not sure how you conclude "... the flange thickness calculated is much too thick for our design". If your calculations arrive at a certain thickness how can that be too thick, or do you mean too expensive? As...

I don't know PV Elite, but here's what I would do. Make a simple model (2 or 3 rings and a couple of heads) all of identical thickness. You know the CG is exactly at the centre, so see what PV Elite reports. If that's still ambiguous make one of the heads thinner and see how the reported CG...

In Ontario the rules are set by PEO (Professional Engineers Ontario). The rules are backed up by law, and thus sealing is a statutory obligation. The rules may be different, or non-existent where you are. When Eng A sealed the drawings without clarification, these rules state they have also...