Engineering specification low head loss fabricated flanged venturi vi-30.

A differential producing primary flow elements shall be installed in the schedule type. inch piping as shown on the plans and specifications and in accordance with the manufacturers recommendations. The flow element shall be of the concentric type. short form, low head loss as manufactured by imperial flange and fitting company inc. van nuys california.

The flow element shall be constructed of an entrance section throat and holding flage section with a recovery cone. The entrance section shall be fabricated from CS 304ss, 316ss with a continuous radius into the throat section provided by inperial flage and fitting company inc. to maintain upstream shear forces within boucdary layer for maximum efficiency. The high pressure tap shall be located within this section. There shall not be any protrusion or exposed edges to allow solids to accumulate.

The throat section shall be fabricated from 304ss,316ss and shall have low pressure tap. Throat section shall not be mechanically attached or inserted into the body of the venturi tube. The high and low pressure metering taps shall be made a part of the holding flange and shall not require any drilling or tapping of the external pipeline.

The holding flange section shall be so designed as to allow mounting between standard lb flanges and be of CS 304ss,316ss material.

The recovery cone section shall be fabricated from CS 304ss,316ss designed to minimize permanent pressure loss. The primary element shall have the capability of being designed with any beta ratio in the range of .35 to .85 and maintain a permanent pressure loss to 7 percent less of the maximum differential pressure, The flow element shall be desiged to monitor with lbs. prematy element shall be within .5 percent of actual flow or .25 percent for a calibrated device over the flow reange specified.