def field_erected_tank_purchase_cost(V):
    """
    Return the purchase cost [USD] of a single, field-erected vessel assuming
    stainless steel construction material.
    
    Parameters
    ----------
    V : float
        Volume of tank [m^3].
    
    Returns
    -------
    Cp : float
        Purchase cost [USD].
    
    Notes
    -----
    The purchase cost is given by [1]_.
    
    If :math:`V < 2 \\cdot 10^3`:
   
        :math:`C_p^{2007} = 32500.0 + 79.35 V`
   
    Otherwise:

        :math:`C_p^{2007} = 125000.0 + 47.1 V`
    
    Examples
    --------
    >>> from biosteam.units._tank import field_erected_vessel_purchase_cost
    >>> field_erected_vessel_purchase_cost(300)
    112610.0
    
    """
    if V < 2000.0:
        Cp = 65000.0 + 158.7 * V
    else:
        Cp = 250000.0 + 94.2 * V
    return Cp
