Tank Remaining Life
Tank Remaining Life
(OP)
I'm not exactly sure what the end product should look like but does anybody have an example of a spread sheet to do remaining life calcualtions for an vessel/tank. I have a history of thickness readings and now I want to make use of the information...or is the spreadsheet a propritary product?
Thanks.
Thanks.





RE: Tank Remaining Life
really all you need is thickness now, which will tell you fatigue life, less current cycles = remaining life
RE: Tank Remaining Life
Is it a tank?
Do you need a tank design?
What is corrosion rate?
RE: Tank Remaining Life
RE: Tank Remaining Life
I don't have my old files with me right now but I'll bring them in Monday and see if I have a copy kicking around somewhere.
RE: Tank Remaining Life
RE: Tank Remaining Life
I've looked through my files and I didn't save a copy of that spreadsheet.
Good luck!
K
RE: Tank Remaining Life
Thanks for looking!
RE: Tank Remaining Life
i don't know your references, but i suspect the calc goes something like wall thickness (decreasing over time) > pressure vessel stress > fatigue life (maybe < endurance limit, GTG) > expired life (number of duty cycles) > remaining life
RE: Tank Remaining Life
loss or L = Tp - Ti
loss/year or Ly = L/t
remaining thickness R = Tr - Tp
remaining life RL= R/Ly
time to next inspection is the lesser of RL/2 or 10 years
RE: Tank Remaining Life
i think you need to start with the original safe life, recalc the safe-life (as the thickness decreases), recalc the remaining life ... not so straight-forward ... maybe a simple way is to use something like miner's rule, summing the damage ratios from various thicknesses. maybe set up the calc from day 1 to the end (sum = 1.0) decreasing the thikcness similar to the measurements ...