API 650 11th Edition û 5.11.2 Unanchored Tanks
API 650 11th Edition û 5.11.2 Unanchored Tanks
(OP)
MDL is a moment about the shell-to-bottom joint from the weight of the shell and roof supported by the shell. Is this weight to be considered in corroded condition or new tank weight?
Thanks.
Thanks.





RE: API 650 11th Edition û 5.11.2 Unanchored Tanks
RE: API 650 11th Edition û 5.11.2 Unanchored Tanks
See the definition of Dead Load in 5.2.1. Also note the usage of "nominal" (= "as-built") roof thickness in App. F, sections F.1.2, F.4.1, F.4.2, etc.
Note that when calculating uplift forces on anchor bolts, the corroded thicknesses are used.
RE: API 650 11th Edition û 5.11.2 Unanchored Tanks
May I, Just add slightly from a somewhat different perspective of corrosion.
Since Corrosion is most usually oxidation(i.e.oxygen is added and weight slightly increased per unit area;with the exception if it is peeled-off/ removed.)
Whereas usually it stays-on& should be witnessed clinging and associated on to the surfaces; therefore most probably this weight increase
And consequent possible momentum factor increase on this account is not considered greatly affecting from an overall perspective by the Standard related personnel.
Hope this gives some explanation to your query.I believe!
Best Regards
Qalander(Chem)
RE: API 650 11th Edition û 5.11.2 Unanchored Tanks
RE: API 650 11th Edition û 5.11.2 Unanchored Tanks