In general, you have to analyze both the suction and the discharge for any API pump. This is because we often put very minimal flexibility into the suction lines to keep the NPSH requirement down - I have seen many more pump installations fail to qualify under API on the suction side than on the discharge side. Remember that, even for suction from a tank at ambient temperature, your pipe will have temperature fluctuations due to solar irradiation and normal ambient temperature fluctuations. We can ignore such small temperature variations for pipe, but sometimes our piping system is stiff enough that even small temperature changes cause nozzle allowables to be exceeded. Also, don't forget about tank and support settlement.
If both nozzle load sets are under the contractual load limit (many organizations now specify pumps with 2X API or higher allowable nozzle loads), you're OK. If not, and you're within 2X the contractual limit, you can use Annex F to calculate your way around the basic table limits. Note that you could easily fail to meet the equations in Annex F without any single load on any nozzle exceeding 2.0x the basic table allowable - for instance, all your loads could be 60% over, and you would then exceed the limits of equations F.1 and F.2 by about 6.7%.
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CraigB