Case Study: Subsea pump Pump Condition Monitoring

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Case Study: Subsea pump Pump Condition

Monitoring 2007-2010

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Partners: Smart Fibres, Flowserve, SKF, Teledyne ODI Project Sponsor: Shell Upstream Americas – Deepwater Platform: Subsea twin-screw pump and motor Objective: Develop fibre optic condition monitoring Why fibre: Harsh environment, no subsea electronics

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18 motor temperature sensors

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Pump lube oil pressure & temperature

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Bearing housing tri-axis acceleration

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Bearing condition monitoring (with SKF)

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Bearing loads match FE model within 5%

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10 kHz raw data. Odd signal on one roller

Enveloping shows defect. Time period = cage speed

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Enveloping of FFT

Healthy bearing

Damage bearing

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Data analysis predicted: 3.0 mm scratch length, minimal scratch depth

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Inspection found… 3mm scratch length, and 2 micron scratch depth

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Image c/o Shell

on a bearing inside here

visible on an instrument here

A 2 micron scratch here

+44 1344 484111 [email protected] smartfibres.com Smart Fibres Ltd, Spectrum House, Brants Bridge, Bracknell, RG12 9BG, United Kingdom

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