I am trying to clarify if performing a calculation for t-min. on a vessel, when inputing the pressure(P), would you use the MAWP/design from the dataplate or U-1 form only, or would you add the static head to the MAWP.
Question 2: After performing t-min calcs, would you add the corrosion...
The corrosion allowance on the U1 is O. It was built in 1991 to 1989 AD.
jte-I believe the allowable stress for this would be 18.8 @650F based on the thickness of .271"
The reason I bring it up is because I am confused as to why the nominal stated on the U1 which is .271" is what I get when I do the t min calculation. The actual readings taken were between .270"-.276". It seems to me that there is very little wall loss yet the t-min calculates out to be the...
In calculating the t-min for a small propane tank it seems that the t-min is equal to the nominal. The vessel is designed for 250 psi @650 F which it would never see. It is made from SA-455. Can I derate this just by lowering the Max temp to 450F and attaching a new plate with this info or what...
What about using E-309 if the repair is just on the inner nozzle plate welded directly to the cladding. The design drawings show the use of E-309 here. I am assuming that this is where the problem should be. I'll know more once the vessel is opened.
It is an atmospheric column in a crude distillation unit. It is a 4" c/s nozzle with a 3 1/2" s.s. pipe inside of it. The s.s. pipe has a plate around it that is welded directly to the clad lining on the vessel I.D. and seal welded at the nozzle flange end. I am not sure of the Op pressure and...
If there is a repair done on the cladding of an atmospheric column around a nozzle, would this be considered a code repair requiring the useof an "R" stamp holder etc. There is a leak noted from the telltale nozzle which has a s.s. insert and is seal welded at both ends of the nozzle. The...
