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General:
Furnish and install as shown on the drawings a fl ow element of the Venturi Nozzle design differential pressure type as manufactured by Preso.
Confi guration:
The Venturi inlet section shall be built with a precise radial section causing a uniform change in fluid velocity. The cylindrical throat section with pressure sensing taps shall have a straight
section and the exit cone shall have a precise angle in order to prevent permanent pressure loss that will not exceed 10% of the generated differential pressure. The beta ratio shall be determined by the manufacturer according to recognized standards and formulas. The discharge coeffi cient (Cd) shall be linear and stable in the operating fl ow range and shall have a value above 0.90. This shall be achieved by adhering to the ASME and/or ISO 5167 standards.

Materials:
The construction shall be with an inlet and outlet section with insert style wafer holding fl ange all of 304 stainless steel with instrument connections and instrument valves selected to meet the intended service conditions. Identifi cation tag shall be provided as required.