Answer Posted / carl_ellis

mmH2O is units of pressure, probably differential pressure in a case involving flow rate.


kg/hr is units of mass flow rate, kilograms per hour.



There is no inherent or implicit relationship between mmH2O and kg/hr. Therefore, there is no conversion between the two.

Differential pressure can be used to measure volumetric flow rate of liquids and gases and an inferred mass flow rate can be calculated for liquids with a known density and gases when there is static pressure and temperature compensation.


But not only do those those measuring conditions need to be met, but DP flow rate is dependent on a specific differential primary flow element and the characteristics of the fluid involved.


That means a measurement in mmH2O pressure drop in a specific design for a liquid differential flow meter could might be converted to a kg/hr mass flow rate (with appropriate static pressure and temperature for gas), but it would be specific only for that application and not transferable to any other application.

Any given DP measurement, say 2000 mmH2O, can represent 1.20Kg/hr in one flow meter and 45,000kg/hr in another flow meter. There is NO inherent relationship. Any correlation is application-specific.

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