## How to use API 650 ANNEX M.4.2 formulation

## How to use API 650 ANNEX M.4.2 formulation

(OP)

Dear All,

M.4.2 says that if all criterias of either condition a or b are met, cyclic design life evaluation need not to be made. Condition b, says that 0.3(Dt)^0.5 is normally maintained in tank. My question is this that the value which comes out from this formula needs to be compared with which liquid level: "high liquid level" or "low liquid level" or "low low liquid level"?

Regards

Inam

M.4.2 says that if all criterias of either condition a or b are met, cyclic design life evaluation need not to be made. Condition b, says that 0.3(Dt)^0.5 is normally maintained in tank. My question is this that the value which comes out from this formula needs to be compared with which liquid level: "high liquid level" or "low liquid level" or "low low liquid level"?

Regards

Inam

## RE: How to use API 650 ANNEX M.4.2 formulation

## RE: How to use API 650 ANNEX M.4.2 formulation

Regards,

Inam

## RE: How to use API 650 ANNEX M.4.2 formulation

## RE: How to use API 650 ANNEX M.4.2 formulation

## RE: How to use API 650 ANNEX M.4.2 formulation

"N" is the estimated number of cycles. If the tank is not operated under exemption (a) or (b), then the bottom/annular plate/shell need to be adjusted so that N calculates to be greater than 1300.

## RE: How to use API 650 ANNEX M.4.2 formulation