It can be dependent on reinforcement requirements of your openings. So you need to know your design conditions & understand your reinforcement areas if req'd. But assuming you do not need your openings reinforced, there is no code requirement for minimum spacing btw openings. But typically...
Anyone telling you to tension all your flange joint studs has never worked in a real plant before. Plants will have thousands of studs in hundreds of flange joints needing to be worked, often together in large quantities at the same time during outage/maintenance events. The time it takes to...
I believe what the OP means by "hot torqueing" is what PCC-2 calls "start-up retorque". This is done when your process temp first reaches approx 400F immediately after startup. Note your flange bolts will not be at 400F at this time (assuming uninsulated flange joint, which it should be). The...
You can't fully evaluate the sockolet weld to main header with an RT. But you can often still get some idea of weld quality. You can also check for your socket gap after welding if curious. It's not useless to RT sockolet to main header welds.
Using a sockolet is much more common than a repad in this case. The sockolet is an integrally-reinforced fitting. You can still x-ray (RT) the full-pen branch weld to check for weld defects, but yes I don't believe you can qualify this weld via x-ray (RT) or UT volumetrically. Yes, mpi of...
Ah yes, welcome to the world of overdesigned flanges, brought to you by VIII-1, MA 2. One quick tip that may be helpful is to use a gasket with lower "m" & "y" values. In other words, ignore the "m" & "y" values shown in MA 2 for gasket types. This is done often with Kammpro type gaskets...
This may be true now, I'm not 100% sure. I never deal with SA-105 on tubesheets or girth flanges on new HXs since we're always going with SA-350 to get out of any impact test requirements for our lower required MDMT ratings. I know we have many older HXs that are still in operation with SA-105...
No, you can design custom girth flanges & tubesheets to SA-105/SA-350 all day long, so long as you fall under the requirements of the specs. Most carbon steel girth flanges & tubesheets are SA-105/SA-350. I work up North, with low MDMT requirements, so all of our CS girth flanges & tubesheets...
It's a ball valve. Looks like 14" 150# (Class 150) ASME/ANSI flanges to me. Interesting they installed the stem in horizontal here with the gearbox on it. May be the way to go to flush out any junk/debris every time it's opened/shut.
Forum - I know there have been past threads on this, but my question relates to a specific question on the company standard I'm working with on API valve trim types & NACE requirements:
Question 1) - Under the company standard I'm working with, if the process service is "Sour Water" or...
Almost all ASME VIII-1 S&T heat exchangers are designed to meet TEMA (Class R) standards as well, along with API660 standard if you are in the oil & gas industry. This is established up front in your bidding/purchase order documents with the vendor typically. If you say nothing, most vendors...
The thermal expansion stresses btw CS base metal shell & a solid SS nozzle vary greatly depending on the nozzle size. In the case of smaller nozzles (<3"), these stresses are typically acceptable (depending on operating temp) & solid SS nozzles can be a practical & cheaper solution, even if...
If your process isn't hazardous & your design conditions are low enough (lower design pressure & temperature), you may be able to just install a temporary "skinner clamp" or similar (https://skinnerco.com/pipeline-clamp/). If your design conditions are higher, you may have to go with a bolted...
The shell-to-nozzle weld is not a fillet weld. It's a full-pen groove weld. The reason for back-gouging this weld is to ensure you have a clean full-pen weld all the way through. This is standard practice in industry. r6155, as usual, should be ignored.
First question answer: You can apply it wherever & whenever you want. Note that the design temp for your bolts should be lower than the design temp of your process. B31.3, for example, states a 80% value for flange bolt design temp compared to fluid design temp I believe (double check me on...
You could do PT (liquid dye penetrant) NDE on the bevel prep end of the pipe that has been cut & re-beveled if you're concerned about any surface flaws. Not required though. If this is all new carbon steel pipe, I doubt you'll have any issues
