What is the pressure of water in the M.S pipe velocity 1.5m/s and Diameter of pipe 150mm?

You're going to have to be more specific. First - what is an "M.S. pipe?" To find the dynamic pressure in the pipe you will need to specifiy the static pressure - providing the velocity of flow is not sufficient. However, it may be possible to calculate loss of pressure per unit length for this situation - is that what you meant?