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UPLIFT CONSIDERED IN API 620 TANKS

UPLIFT CONSIDERED IN API 620 TANKS

UPLIFT CONSIDERED IN API 620 TANKS

(OP)
What is the procedure to find UPLIFT forces required for anchorage in API 620 tanks ? , if there isnt any ,can I use Uplift load conditions given in API 650 table 5-21 as given below. If i use the formula given in API 650 the value of UPLIFT seems to be high .
P-8Th X D2 X 4.08 - W1
My question is whether the USED condition from API 650 takes account of only the Design internal pressure acting on Roof , because it doesnt seem to considering the internal pressure acting downward & on the shells .
 

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