You can get a Plan Review by an architect at the Fire Marshalâs Office, and they have satellite offices all over the state.
Primary flow element. A primary flow element is the element of a flow meter that serves to indicate the quantity or velocity of flow. For example, in the case of an orifice flow meter, the differential pressure across the orifice plate is the primary flow element.
Each NMIâs national flow reference standard(s) is classified as a primary calibration standard. 1  A primary flow standard is not calibration for flow measurement specifically, but rather, is calibrated based on a unit of measure that is classified as âfundamental.â For primary flow standards, the most common fundamental calibration units include: 1  Length/Distance. 2  Time. 3  Mass. 4  Temperature.