The Flow Conditioner is a device that improves the fluid velocity profile across the flow section. This device is typically applied when pipe straight length requirements cannot be satisfied. This often happens when, due to layout constraints, it is not possible to install a flow meter in a straight portion of pipe suitable to obtain acceptable metering conditions. With this device it is possible to have the best fluid velocity profile, even if the pipe straight length is less than the minimum prescribed by the code. On the other hand, the introduction of a flow conditioners introduces additional permanent pressure losses that shall be verified against process constraints.