Flow Meters

ProMax supports several calculations related to Differential Pressure Flow Meters to assist you in estimating the pressure effects of these meters in your units. The properties of the flow meter can be calculated by specifying the Meter Type, along with the Pipe Diameter and Orifice Diameter in a stream analysis. Currently, ProMax supports the following types of flow meters:

Orifice Meters – “Corner”, “1D – 1/2D”, and “Flanged”

Nozzle Meters – “ISA 1932”, “Long Radius”, and “Venturi Nozzle”

Venturi Meters – “As-Cast convergent section”, “Rough-Welded convergent section”, and “Machined convergent section”

Discharge Coefficient – A user-defined type of flow meter. If your flow meter is not an Orifice, Nozzle, or Venturi type, the properties can still be determined if the Discharge Coefficient and Permanent Pressure Loss Ratio are provided.

For Orifice, Nozzle, and Venturi Meters, once the type and diameters have been specified, ProMax will calculate the Discharge Coefficient, Permanent Pressure Drop, and other properties of the flow through the meter. The analysis utilizes the correlations provided by the Crane Technical Paper No. 410 (2009) to estimate the discharge coefficient for each meter type.

Estimate the Flow Resistance

Once the Differential Pressure Flow Meter Analysis has calculated the properties of the flow meter, the calculated flow resistance coefficient can be specified directly in a ProMax Pipeline block. This will override the estimated value from the Pipeline library with information tailored to your specific model, more accurately simulating the pressure drop effect of your flow meter within the rigorous pipeline calculation.

Directly Apply Calculated Pressure Drop to Simulations

A JT Valve block in ProMax can utilize the Differential Pressure Flow Meter calculations as a pressure drop method option, allowing your simulation to automatically account for the pressure drops associated with your flow meters. The JT Valve calculation will seamlessly update as flow rates change at various scenarios run in your model, and will issue an error if the pressure drop exceeds the available pressure at any point.

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