Misalignment

Vibration Project PresentationVibration of PumpPump vibration problem

MisalignmentMisalignment () Alignment 2 Misalignment Misalignment(Angular Misalignment)

(Parallel Alignment)

(End float)

(Torsional flex)

(Angular Misalignment) (Axis) .

(Parallel Alignment) (Offset) 5

10-1 10-3 Preventive maintenance Condition based maintenance Laser Alignment Jack Lambley Alignment Laser Alignment 10 : 27 kW/pump* 8760 hrs/ *$0.1/kWh*1,000 pumps*0.01 = $236,520/ 1,000 pumps Laser = $.25/

Cavitation

NPSHA > NPSHR (NPSHR)

NPSHR 6 Rotating unbalanced mass (unbalance)

d = n(1 - 2) 1/2 unbalanceStatic Unbalance Inertia Axis Rotating Axis C.G.

static unbalance shaft support

unbalanced mass unbalanced mass Dynamic Unbalance unbalance 1 inertia axis rotating axis (rotating part)

static unbalance dynamic unbalance dynamic unbalance

Balancing MachineBalancing machine unbalanced mass unbalance Balancing machine unbalance

Vibration MonitoringVibration Measurement

3 (Displacement) 1200 / 20Hz

(Velocity) RMS 20Hz -1,000Hz

(Acceleration) 10,000 Hz (Vibration measurement Method)

3 (Axial, A)- - 2. (Radius) (Horizontal, H)- - 3. (Radius) (Vertical, V)- -

(Vibration monitoring)

Proximity monitoring

(Overall)

ISO 2372 ISO10816

(Standard and Judgment)

Seismic monitoring

2

1. Overall

2. Spectrum

Vibration Spectrum

Unbalance

Bent ShaftPump and MotorMisalignment(Angular)

Vibration Spectrum

Pump and MotorMisalignment(Parallel)Blade pass or Vane pass Flow turbulenceCavitationA pipe carrying steam through a section of a factory vibrates violently when the driving pump hits a speed of 232 rpm. In an attempt to design an absorber, a trial 1 kg absorber tuned to 232 rpm was attached. By changing the pump speed, it was found that the pipe-absorber system has a resonance at 198 rpm. Redesign the absorber so that the natural frequencies are less than 160 rpm and more than 320 rpm.