View Larger

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 cylindrical with a pressure sensing tap and of the same diameter as the incoming pipe section and followed by a precise smooth contoured radius section causing a uniform change in fl uid velocity, and to prevent a permanent pressure loss on 3% at 0.75 beta.
The beta ratio shall be selected by the manufacturer according to standard engineering formulas. The discharge coeffi cient (Cd) shall be linear and stable in the operating flow range.
Materials:
The construction material, instrument connections, instrument valves and end connections shall be selected to meet the intended service conditions. Identifi cation tag shall be provided as required.