Static Mixer

A possible translation:

"Above 17.5 bar pressure drop, expect the static mixer element to find its way out through the downstream port, probably bent, and possibly in fragments. At the design flow, the pressure drop through the device is expected to be less than the maximum 10psi allowable"

U mean to say above 17.5 bar, mechanical damage would occur... hmm that seemz logical, bt i m nt assuming anything rather asking the vendor to ellaborate

The 17.5 bar pressure drop would be a maximum allowable, which would occur at a high flow rate. Your actual process flow is probably less, hence the pressure drop will also be lower. If you have access to the technical part of the vendor's report, see if there is a chart or graph that shows pressure drop at various flow rates and for various fluids. To give a rough example, if your design flow was 10 gpm at 10 psid, a large flow of 160 gpm would result in 17.5 bar pressure drop (PD varies as square of flow). It appears that the vendor has stated the matter correctly and straightforwardly, but check the technical data.