Abstract:Accurate and rapid calculation of the friction power consumption of dry gas seal is conducive to the design,operation and performance monitoring of dry gas sealThe interfacial frictional torque times the rotational angular velocity is the friction power consumptionThe concept of equivalent clearance was presented based on the idea of equal volume of the clearanceIt means the volume of equivalent clearance equals the volume of actual clearanceAccording to equivalent clearance,the calculation formula of the interfacial frictional torque of the mechanical seals with grooved faces was obtained by using Newtons law of shear directlyTaking spiral groove dry gas seal as an example,the calculation result of this formula was compared with that of Muijdermans formula,Gabriels formula and Sedys formulaThe results show that the proposed calculation method proposed is more accurate than the Sedys method and the deviation of this method is decreased significantly with the increasing of operating thicknessIn the common range of 3μm to 5μm of operating thickness of dry gas seal,the proposed calculation method has sufficient accuracy.