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mk3223, Thank you for the input. Are you referring to the under bottom connections detailed in Annex O? JStephen, I've heard of the eccentric reducer style as well. Any specifics on what you'd classify as a low stress tank? Maybe <0.5*Sd in the tub ring?

Hello, The attached sketch shows a drain style where half the pipe penetrates the shell above the floor and the other is half below and penetrates through the floor. I'm aware this detail is not included in API 650, but is fairly commonly used in the industry. Any thoughts on what tanks...

Hello, In many parts of API 650, footnotes have been added to show which papers and research formed the basis for the equations given. However, nothing is provided for Flush-Type Cleanouts and Shell Connections. Is anyone aware of any paper(s) or research that the API 650 Flush-Type Cleanouts...

I'm not a student, so I can't take the volume home but they said I could scan as much as I want on site. My guess is that I can send it to another engineer, but I'll check and if so, I'll gladly send it to you.

Thank you for the responses. IFR's - Heads up, just found API Bulletin 2U on Techstreet.com and there's a 3rd edition out in 2004. Just bought it. JStephen - Luckily the U of M library by me has the "Proceedings of the American Petroleum Institute,1963, Vol. 43" in high density storage...

Does anyone have or know where one could find R.V. McGrath, “Stability of API Standard 650 Tank Shells,” Proceedings of the American Petroleum Institute, Section III— Refining, American Petroleum Institute, New York, 1963, Vol. 43, pp. 458 – 469? I've searched high and low and this one is...

That's still part of the latest AWWA D100-21 and I've always wondered why they have that limitation. Wish they gave background on some of these rules.

Hoping the experts can clear something up for me. I think we can agree AWWA D100 is generally a more conservative design standard when compared to API 650. So I'm wondering why there's such a large difference in roof design with API 650 being more conservative. API 650 requires roofs to be...

Originally I had an issue where my Documents folder was redirected to the server and for whatever reason (Mathcad support would not say), I would come into work the following morning and my Mathcad file size would be 0kb with the file corrupted and unrecoverable. After that I've had my Mathcad...

Thanks for the input and tip. However, even though that helps, the file is still extremely slow. I also disable areas until I need them. Did you or are you planning to switch to a different software?

I had kind of forgotten that I brought this issue up to Mathcad over a year ago and since I haven't heard back on the file I sent them, I'm going to make the assumption that there isn't anything particularly wrong with my file and it's just the way the program currently runs. With this new...

I had a hunch you were using Mathcad 15 and I don't blame you, as far as I've heard it's a much faster program. I've unfortunately written the program in Mathcad Prime 8.0. I may take you up on your offer to review my file, but do you have the capability to open/view a Mathcad Prime 8.0 file...

Thank you for the responses. IFR, the fact that your API 650 Mathcad design program works without bogging down is great to hear, especially since you seem to have more details of the code built in. I currently have Mathcad techies looking into why mine runs so slow. I have a few questions...

I spent a considerable amount of time creating a robust API-650 design program in Mathcad. Apparently it got too complex/large for Mathcad to handle because it's now so slow it's basically unusable. Anyone else run into this issue? Any tips? My PC is pretty powerful btw, 3.8 GHz I7 processer...

blacksmith37, "likely additives and contamination will produce any significant vapor pressure." *will or won't? After a fruitless search for the Latent Heat of Vaporization and Molecular Mass of Vapor, I ended up just using the "cookie cutter" API 2000 emergency venting tables for...

Compositepro, I'm designing per API 2000 which specifies two types of venting, normal and emergency. Normal venting includes provisions for tank fill/discharge and thermal effects, the latter is what you're referencing with a rain event on a warm/hot tank. Like don1980 assumed, I need the...

I'm looking at designing emergency venting for two different tanks, one for asphalt/bitumen storage and one for used motor oil storage. In order to design the venting I need the Latent Heat of Vaporization and Molecular Mass of Vapor for both liquids. I scoured the internet and haven't come up...

I'm looking at designing emergency venting for two different tanks, one for asphalt/bitumen storage and one for used motor oil storage. In order to design the venting I need the Latent Heat of Vaporization and Molecular Mass of Vapor for both liquids. I scoured the internet and haven't come up...

I'm looking at designing emergency venting for two different tanks, one for asphalt/bitumen storage and one for used motor oil storage. The design spec for both tanks is API 650 which states that all tanks require a form of emergency venting: tank frangibility or pressure relief devices per API...

Can't seem to sort this discrepancy out, could use some advice: Equation (15) of API 2000, for the required flow capacity, states that "T" the absolute temperature of the relieving vapor is normally assumed to be the bubble point of the stored fluid. However, the "cookbook" tables 5, 6, 7 and...