Just be careful. API 610-11th Ed-2009 6.5.5 says: "Annex F gives methods of qualifying nozzle loads in access of those in Table 5. The purchaser should be aware that the use of the methods in Annex F can result in a misalignment up to 50 % greater than that based on the loads given in Table 5 and can impact equipment installation criteria. The use of the methods in Annex F requires approval by the purchaser and specific direction to the piping designers for its use."

I think this mandatory statement is very clear. The piping designer cannot make decision by themselves without approval by the purchaser and the pump supplier.