def power_pump(flate_pump_feed, rho_F, g, head_pump, ECE_motor, ECE_trans):
    """
    Calculates the  power of pump.
    Parameters
    ----------
    flate_pump_feed : float
        The flow rate pump for Feed [m**3 / h]
    rho_F : float
        The density of feed, [kg / m**3]
    head_pump : float
        The  hydraulic head of pump, [m]
    ECE_motor : float
        The energy conversion efficiency of motor, [dismensionless]
    ECE_trans : float
        The energy conversion efficiency of transfer, [dismensionless]       
    Returns
    -------
    power_pump : float
        The  power of pump, [kW]
    References
    ----------
    &&&&
    """   
    return (flate_pump_feed * rho_F * g * head_pump / (ECE_motor * ECE_trans))