Equipment: Circulating Water Pump 1BLocation: CommonPump Specifications Motor SpecificationsType: Vertical Manufacturer: HyundaiNo. of blade 5 Power: 3300 kWModel: Speed: 295 rpmCapacity: 45280 m3/h Voltage: 11000 VTotal Head: 22.37 m Phase: 3

Poles: 20Frequency: 50 Hz

Point SymbolMotor outboard M1Motor inboard M2Shaft vibration SThrust bearing axial vibration Z

The pump is designed to suck sea water from Intake to condenser.

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M1

M2

S

Z

Since starting service in 2014, vibration of motor gradually increase after each low tide event (suction pressure reduces 2 times per months).

- In Apr 2016, the motor vibration is maximum 5mm/s when suction level is 6.5m

- In 2018 and 2019, the pump is trip by vibration at NDE motor 1 times, and many time peak to 7.1mm/s, but not trip due to delay in logic

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Data collected by CSI 2600 vibration analyzer, from port of the Pump’s vibration monitoring system

At normal tide level (7m)o Motor NDE side: dominant peak at 2X

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o Motor DE side: also dominant peak at 2X, and some peak around 140Hz (which is not appear when collect data by portable analyzer)

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o Shaft vibration: dominant peak at 1X, 2X peak appear

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o Axial vibration at thrush bearing: peak at 5x with noise floor raises

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At low tide level (6.4m)o Motor NDE side: vibration level is much higher than normal tide, but dominant

peak still 2X

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o Motor DE side: same situation as NDE side, but amplitude does not increase as much as NDE

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o Shaft vibration: does not change much compare with normal tide

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o Axial vibration at thrush bearing

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