The invention provides niobium-titanium films, coatings comprising one or more niobium-titanium films, and substrates bearings such coatings. The rotor apparatus of a pump includes a drive shaft in which a plurality of arcuate circumferential surface sections centering on an axial center and a plurality of flat surface sections are disposed alternately, and an inner rotor having a mounting hole into which the drive shaft is inserted. A turret-style separator is positioned within the containment vessel, the separator comprising blades, and adapted to contain the soap sticks between the blades of the turret-styled separator and the contiguous wall of the containment vessel. A feature pressure signal is located in at least one of the frequency bands and compared to a reference wavelet to determine if a fault exists in the hydraulic pump andor a type of defect in the hydraulic pump.