Detection of Inception Cavitation in Centrifugal Pump by Fluid-Borne Noise Diagnostic

Table 2

Instruments in measuring system.

Device	Range	Resolution	Locations
Electromagnetic flowmeter	1–50 m^3/h	±0.5%	The length of straight pipe before and after the flowmeter is 10 times of its internal diameter
Pressure transducer at inlet	−0.1–0.1 MPa	±0.5%	2 times of pipe diameter from inlet flange
Pressure transducer at outlet	0–0.1 MPa	±0.5%	2 times of pipe diameter from outlet flange
Vibration acceleration transducer	0.5–8 kHz	10 Mv/ms^−2	Discharge flange, pump foot, and pump casing
Sound pressure transducer	20 Hz–100 kHz	±0.2 dB	1 m away from impeller inlet
Hydrophone	20 Hz–200 kHz	±2 dB	8 times of pipe diameter from outlet flange