Orifice flange assemblies are used for measuring flow of various Liquids, Gases & Steam. It gives an acceptable level of certainties at lowest cost and long life without regular maintenances. Orifice Plates are most commonly used as primary element for flow measurement in pipelines based upon the principle of measurement of ‘Differential Pressure’ created when an obstruction is placed in the fluid flow, due to increase in fluid velocity. The orifice plate dimension is based on BS/ISO- 5167 specification.

The use of the orifice flange assembly negates the requirement for further pipe drilling ensuring the quality of the tapping to ISO 5167-2 and minimizing the errors of the system. Although the weld beads and condition of the upstream piping should be considered when assessing the overall accuracy of the flow meter.

When fluid is flowing from main pipeline. Orifice plate restricts the flow and develops the Differential Pressure which is proportional to the square root of the flow rate.