A liquid at 10 C (kinematic viscosity of 1.307*10^-6 m^2/s) is to flow from a roof-top reservoir to a tanker truck through a cast iron pipe (roughness of 0.26 mm) of length 25 m at a flow rate of 0.0020 m^3/s. The roof-top tank liquid level is located 2 m above the tanker truck fluid level. The system contains a sharp-edged entrace, 6 threaded 90 degree elbows, and a sharp edged exit. Determine the required pipe diameter for the given flow conditions. Assume the SG of the liquid=1.05.