3-6. Metering of an Oil Flow by an Orifice. A heavy oil at 20C having a density of 900kg/m3 and a viscosity of 6cp is flowing in a 4-in. Schedule 40 steel pipe. When the flow rate is 0.0174m3/s, it is desired to have a pressure-drop reading across the manometer equivalent to 0.93105Pa. What size orifice should be used if the orifice coefficient is assumed as 0.61 ? What is the permanent pressure loss