What is the design temperature of these bolts you're looking to use? I'm not familiar with ISO standards, but it appears they are ahead of ASME in not allowing above 300 C / 572 F, as MintJulep mentioned. I've never installed austenitic SS bolting on any high temp application I've ever...
HF acid wormhole through the casting it appears. Very common in HF acid service, although I've seen it more on Carbon Steel castings. Monel castings, as you mentioned, are the issue. A very difficult material to cast properly. Many companies require the M35-1 type Monel casting for this...
Anyone who's ever had to actually enter a vessel manway would never design one to 18". 24" should be the minimum size. This is written in many of the major company design standards
I've never once spec-ed out HIC-resistant or PWHT carbon steel for the base metal/backing of any sour service vessel with 100% internal SSC-resistant alloy clad/weld-overlay. And I've spec-ed out & installed dozens of these types of vessels. The major companies I've worked for/with have also...
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...
