Then that is 3 horsepower electric. Thought the guy was using a 22 GPM pump. So here are some 3,450 RPM, 3 horsepower models with high breakdown torque from Leeson and Baldor:
Leeson:
120341 << Max breakdown torque is 300% of full load torque.
131637 << Max breakdown torque is 284% of full load torque.
Baldor:
L3606 << Max breakdown torque is 311% of full load torque.
These are the choices I think would be best for you, OP. They leave PLENTY of margin since at most, the motors will see no more than 150% beyond full load torque. So you got plenty of extra oomph that is not needed, but it helps for under voltage sag conditions because for AC induction motors, the torque varies as the square of the voltage. So say you got 208 volts running on the motor rather than the 240 volts, then that is 13% dip in voltage so only 87% of voltage which means torque will be at 76%. Seventy six percent of the worst one at 284% of BD, gives you 216% BD at 208 volts.
