ASCE 7-16 and 7-22 have some pretty significant changes to wind loading on tanks, see below:
ASCE 7-16
Updated wind speed maps
Ground elevation factor
Significantly updated section for bins, silos and tanks
Including large increases in the force coefficient (Cf) for tightly spaced groups of...
It's odd that we haven't seen an addendum for the 13th Edition of API 650 yet after 5 years. Typically we'd have seen 2-3 addendums and possibly a whole new edition by now. Any idea what's going on with the committee?
Also, no updates to the Technical Inquiries have been made since 2019...
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...
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...
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...
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...
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...
Hello All,
Any help or guidance on the following is greatly appreciated! I'm tasked with analyzing a built-up I-shaped member composed of A-992 WT7x11 and 304 SS 3/16" plate, under simply supported combined major axis bending and axial compression. I've done some research and believe using...
In my industry, fairly tall columns (~50ft) are required with no possibility of bracing and a common style is two wide flange beams stitch welded in a "T" formation as shown below. Required corrosion allowance renders some of these column elements slender as well. It seems that using ASIC...
Could really use some clarification.
API 650 5.5 "Annular Bottom Plates" states that you can use lap welds in lieu of butt welds in the annular bottom if the bottom shell course is of a material in Group IV, IVA, V, or VI and the maximum product stress (see 5.6.2.1) for the first shell course...
We recently built an outdoor, open top, non-insulated, non-heat traced API650 Stainless Steel tank. Shortly after completion, the owner asked the design firm if it's ok that 1ft water will freeze during winters since the tank's lowest drain nozzle is a foot off the bottom (no sump, no sloped...
I'm looking for the yield strength of SA-335 P92 piping in the range of 1350F-1425F. I've searched the Code, the internet and all my sources and can't find anything. Could use some help. Thanks!
We're looking at possibly providing a bid to design and build a Section VIII Div. 1 pressure vessel (we don't hold a Div. 2 stamp) and i'm wondering if someone with creep-fatigue experience can confirm if a creep, fatigue, creep-fatigue or thermal ratcheting analysis would be required. If so...
We're planning on welding in a new wide flange beam into the existing boilerhouse structure to temporarily support a portion of the main steam piping. A lift lug will be welded to the underside of the temporary beam with typical rigging (shackles, chainfall, wire rope slings) attached. Is this...
We fabricated a 65ft long, 12ft diameter carbon steel stack, lined it with 4in of refractory and now we have to lift it onto the trailer for shipment to the customer. The current plan is to have a sling at each end in a basket configuration. The problem I have is that I don't know if the shell...
Any advice on the following would be greatly appreciated. I've been tasked with doing the ASME Section VIII code calculations for a heat exchanger. However I think it is out of the scope of part UHX for the following reasons: It has a segment of a circle (moon) shaped cutout in the tubesheet...
