API 650 Bottom Plate Distortion

[Abd Ur Rehman]

Hello everyone hope u all be fine 
my question is that , as per ur experince how much API 650 Bottom Plate Distortion is acceptable .

[Anand ch]

Dear Abd Ur Rehman,

Out-of-plane distortion equal to 1 percent of the tank radius is considered acceptable."
While that's not an API requirement, that should be a measure of industry standard, 

and that plate distraction not affected on length of the plate that is acceptable range means it will accept the bottom plate 

[Abd Ur Rehman]

how much tolerance is acceptable in circumference (API650) storage tanks.

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[agum...@gmail.com]

Hello it depend of tank diameter:

API 650 2021  7.5.3   Roundness

 

Radii measured at 0.3 m (1 ft) above the bottom corner weld shall not exceed the following tolerances:

Tank Diameter m (ft)

Radius Tolerance mm (in.)

< 12 (40)                                                                              ± 13 (1/2)

From 12 (40) to < 45 (150)                                                   ± 19 (3/4) 

From 45 (150) to < 75 (250)                                                  ± 25 (1)

� 75 (250)                                                                           ± 32 (11/4)

[Mohd Siraj]

50mm acceptable, lets know if it tank is in service?, refer api 653., by the way bottom plate distortion refer as settlement, better to refer with correct terminology.