A differential producing primary flow elements shall be installed in the flanged schedule type inch piping as shown on the plans and specifications and on 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 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 flow 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 flanges shall be so designed as to allow mounting between standard lb flanges and be of CS 304ss 316ss designed to minimize permanent pressure loss. The primary element shall have the capability to be designed with any beta ratio in the range and maintain a permanent pressure loss or less of the maximum differential pressure.

The flow element shall be designed to monitor with lbs of pressure over a flow range of . The accuracy of the uncalibrated primary element shall be within of actual flow or for a calibrated device over the flow range specified.

In case of Carbon steel end flanges, there shall be no contact between the end flanges and the media All stainless steel wetted parts.