Thanks Guys,
Yes as indicated by "dpc" torque is a concern do you suggets me to double the torque for cold start of pump?
becuase i have to select the motor for pump operating temperature in winter condition is -4 to -40 deg C?
Acutally the inside ambient temperature is -4 deg C and the motor should be rated ot -40 deg C. This is winter time and i think i should have high torque available for the motor for cold start?