I second what SnTMan said.
I've yet to see a case on a typical welded box header air cooled heat exchanger where 14.7 PSIG external pressure would come anywhere close to being the governing design case, but if you have to show calcs proving it, follow Appendix 13, section 13-14 "VESSELS OF...
david339933, thank you for the definitions and references. I think it is clear from these definitions that the NBIC "may" be used in both of these cases. But as to whether or not it is "required" to be used and R-stamp "required" to be applied, I still see some gray area. Corrected U1A's are...
Talked to our AIA and he thought since the vessel hasn't left the shop, a corrected U1A can be submitted instead of an R-stamp, but he will call his boss and check to be sure.
Metengr, where can these definitions be found? I know I read once that if the OEM still owns the vessel because it hasn't left the shop yet, then the vessel is still under the code of construction rather than the NBIC, but I cannot find where I read that.
Another similar situation but instead...
Pressure vessel fabricator has 4 pressure vessels that were fabricated 2 years ago. U1As signed off and submitted. Customer did not want to take delivery so they never left the fabrication facility. Now the customer wants to lower the MDMT form -20 to -40 which will require the manufacturer to...
As zdas04 said, there are many criteria to look at.
Assuming this scrubber has a mesh pad, the ID of the vessel has to be sized for the condition. If this is 20" OD with 1/2" wall, you have a 19" ID which gives a superficial velocity of 4.77 fps on the 2 MMSCFD condition and 9.53 fps on the 4...
Like others have said, the force acting to pull the flanges apart would be P x A so if the ID is 8", ~2500 lbs neglecting any supports.
I was curious about flanges with set screws so I googled that and found Zip Flanges... is that what is being used...
I don't think there is any requirement in ASME VIII for pressure up rate or pauses. I've seen a lot of customer specs and only recall seeing one that specified pause intervals on the hydro. I think they required a pause at half the design pressure, again at design pressure, and then go on up to...
Mous1747, there is no such thing as "NACE certified". The NACE MR0175 specification states that it is the end user's responsibility to determine the specific service environment (pressure, temp, and partial pressure of H2s, CO2, pH, amount of chlorides, and is liquid water present?) and use the...
MRDAGERUS, you are correct. The coolant does not need "dwell time" inside the engine or inside the cooler/radiator for efficient operation of the cooling system. I'm guessing this myth has developed because a slower flow rate will likely result in a lower cooler outlet temp (but a higher average...
Background:
In the ACHE industry SA-214 welded carbon steel (11400 PSI allow. stress at 350 F) is by far the most common material for finned tubes in non-sour applications. If a slightly higher allowable stress is required or if seamless is desired, then seamless SA-179 carbon steel (13400 PSI...
This is for some box headers on an ACHE and the thinner plate is 1/2" and 5/8" while the thicker plate is 1", 1.25" and 1.375". At those thicknesses the curve D gives -30F, -21F, and -18F so maybe that is where the confusion is coming from. But the governing thickness is the thinner plate, so...
The plate is normalized so it is curve D. Governing thickness are 1/2" and 5/8" so the MDMT per UCS-66 is -48 F and that can be reduced further due to excess thickness.
So as I said, no charpy test is required, so I don't know why the -30 F impact test on the MTR would preclude it from being...
I have SA-516-70N plate that says on the MTR it was charpy impact tested at -30F.
MDMT is -40 F.
Based on my design calculations, charpy impact testing is not required for my MDMT of -40F.
In my opinion, there should be no problem using this plate for -40 F but I'm being told that since the MTR...
