A heavy oil at $20C$ having a density of $900k\frac{g}{m^3}$ and a viscosity of $6cp$ is flowing in a $4$ in schedule $40$ steel pipe. When the flow rate is $0\mathrm{.}0174\frac{m^3}{s},$ it is desired to have a pressure drop reading across the manometer equivalent to $0\mathrm{.}95{10}^{5}Pa.$ What size orifice should be used if the orifice coefficient is assumed as $0\mathrm{.}61?$ What is the permanent pressure loss?