Al can probably figure that out better than me, but I do know that when you exceed your breaker's rated amperage by more than 10% you should expect it to break.

HOWEVER, Amperage is watts divided by voltage, always and forever. This means that higher voltages result in lower amps. So if your pump is rated at 115 volts and your service is 120, you have a little margin depending on the rated wattage.