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Pietro Fiorentini's orifice fitting FioMaster is a volumetric measuring system based on the optional application of concentrated pressure drop via a stainless steel disc with a calibrated orifice.

The design of this device allows the disc to be replaced without interrupting the gas flow.

It can be used with previously filtered gas and is often installed in the main pipelines of high-pressure transmission systems and medium-pressure natural gas distribution networks.