The measurement Orifice plates are being removed in one the systems at my workplace. This is to remove any pipeline restrictions. Is this going to make much differance? As although there will be a pressure drop across these plates, it will mostly get recovered, and although the pressure drops slighty, the kinetic energy (Velocity) will go up, so wont effect mass flow rate. I was lead to believe measurement orifice plates wont effect the flow much, as they are sized for minimum pressure loss and mass flow rate loss.