I have a client that insists on having top head manways mounted with spring assisted covers as opposed to davit arms. Frankly, I don't know how you can safely spring assist an 800 lb 24" 300# blind flange to open vertically. What happens if the spring fails and a body part happens to be in the...
If one needed a pipe 7" OD x 5" ID x 12"lg, could this be machined from a 7" thick slab of plate? Are there implications with the grain direction of the plate? I just have an unusual circumstance where I have a piece of plate available and the pipe is a long lead item.
Thanks in advance.
Can anyone shed any light as to why API's impact exemption curves are so different and more restrictive as compared to ASME? 3/8" thk SA-516-70 is good to a temp of -20F in ASME, but good only to about +8F in API 650.
I have an issue where a company1 detailed an API tank and used SA-516-70. The...
What is equivalent to a 1/4" npt pipe coupling for England?
I spelled out a 6mm BSP (British standard pipe thread) but am now being asked if it is a 6mm-1.2 or a 6mm-2. I am merely trying to provide a gauge connection on a small vessel. Is there a pipe thread norm in here somewhere?
Thanks in...
I have a vessel thats essentially going to be a large soup can. The vessel is going to be split longitudinally into halves, so I need flanges that run, in essence, the length of the vessel. Are there any design aids or resources out there?
Thanks in advance,
Michigander.
SA-36 is now becoming increasingly unavailable as the new stronger materials become popular. A-992, for example is a structural material that is recognized as a code material, but the recognition does not include Sect 2 Part D properties. Would you just always use a code recognized material for...
I have a test unit to build stateside that is to be shipped to England, and potentially Korea. The bonnets are bolted and the materials I use should be easily replicated and replaceable overseas. What overseas bolting materials are comparable to the SA-193-B7 and SA-194-2H used stateside...
I have a client that fabricated a tank that was subsequently post weld heat treated. The tank was built and stamped to RT-3 so spot radiographhy was performed. The tank was subsequently hydroed, PWHT'd,signed off by the AI, and shipped. The client then decided to do a 100% UT of the vessel and...
I have a client that is looking for an inverted cone roof on a 30 foot diameter tank. Does API recognize this type of installation? Are there issues with type of installation?
Best Regards,
Michigander
I have an App 2 loose flange that is 3" thick per design that attaches to a 1/2" thk head using 1/2" fillet welds on both sides of the flange. I had asked the fabricator to purchase a head with a 3" straight flange, but the head was ordered with only a 1 1 2/" straight flange. Using a normal...
Can nozzles be welded into shells or heads of lethal service vessels the "normal" way, for example, in accordance with UW-16.1(e)? Or is it required to be welded in so radiography can be performed on the joint, as shown in, for example, UW-16(f-4)? I am not seeing a requirement for radiography...
I have a 12" tank that is 5' long. The design call for a nozzle to project through the shell some minimal amount. The nozzle is at the midpoint of the tank so internal access is not practical. The intenral projection was not used for reinforceent, but rather, just to make fabrication easier...
IS there a methodology to analyze reinforcement on an opening in a column skirt? Or is it reasonable to just replace the removed area with equivalent reinforcement?
Thanks in advance...
Can anyone enlighten me on API addendum effectivity dates?
For example, if I purchase the current API 650 it currently includes addendum 3 although addendum 4 has been in print now for some time. Add 3 was written in 2003, I believe, and add 4 in 2005. Does anyone know if there are specific...
I have a "thrifty" client that wants a 30' dia 316 SS API 650 tank. In lieu of a SS center pole and SS rafters, they insist on external CS stiffening welded to the tank roof.
The concept includes an 8' dia rolled bar that is located concentrically on the roof. Angles, usd as pseudo rafters...
I have a number of references regarding column skirt designs but none of them address skirt openings very well. Are there any guidelines regarding the maximum size of skirt openings? Personally, I've limited them to about .3D.
I have a small column that the client want a very large opening in...
We are desiging a vessel with rather large body flanges that is a duplicate of a job done 10 years ago. ( I just love duplicates...) Now that the appendix S rigidity requirements have been included within App. 2, these new mandatory rigidity requirements are tripling the thicknesses of my...
Can anyone comment on the L dimension for the line of support in figure (b) of Fig. UG-28.1? This is the vacuum configuration that has a shell, as well as a top and bottom cone. Are the cone to shell junctures always a line of support? The referenced note 3 says " When the junction is a line of...
When drilling a custom blind flange (ASME App 2), the bolt circle ovalled, and the client would like to use a smaller bolt to compensate. 5/8" bolts would be substituted for the 3/4" bolts. There is sufficient area in the bolts to seat the gaskets. Are there any rules, requirements, or good...
