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Large Seawater Intake Pump Upgrades
Author: Ahmed Al Dossary
1 © Copyright 2012, Saudi Aramco. All rights reserved.
Background
Pump location
2 Large Seawater Intake Pump Upgrades
Background (cont.)
Large Seawater Intake Pump Upgrades
Vertical pump with enclosed shaft tube.
Flow rate 35,000 GPM. Over than 50 years old. Obsolete and no spare parts
available.
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Problem Frequent pump seizure. Enclosed tube oil sealing failure and seawater contamination. Repeated failure in the bushings. Enclosed shaft tub difficult to fill due to improper venting. Pump head weak base plate.
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Findings after Dismantling Excessive rubbing on all bushings. Damaged O-ring at lower side of enclosed tube. Oil leak between enclosed tubes. Lack of lube oil at enclosed tube.
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Failure Root Causes
Insufficient oil flow in the stuffing box. Upper bushing is not totally submerge
in the oil. Oil leak between enclosed tubes
segments. Insufficient oil flow between un-
grooved bushings. Repetitive oil leaks from lower side
tube O-ring.
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Recommended Upgrades
Split base platform pump head and increase plate thickness. Upgrade upper stuffing box and bushing. Improve shaft tubes joint sealing. Improve enclosed tube lower side sealing.
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Pump head split and increase plate thickness for better maintenance and stability.
Large Seawater Intake Pump Upgrades
Before After
Implementation
Joint flange
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Redesign upper stuffing box for better lubrication and oil flow.
Large Seawater Intake Pump Upgrades
Before After
Implementation
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Implementation
Large Seawater Intake Pump Upgrades
Redesign upper stuffing box for better lubrication and oil flow.
Packing Lip seal
Oil reservoir
Before After
Oil inlet
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Install O-ring between tubes to ensure seal between them.
Large Seawater Intake Pump Upgrades
Implementation
O-ring groove O-ring face
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Bushing modification for better lubrication and oil flow.
Large Seawater Intake Pump Upgrades
Implementation
Oil groove
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Lower tube sealing modification.
Large Seawater Intake Pump Upgrades
Implementation
O-ring grove
Bowel
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Large Seawater Intake Pump Upgrades
Lower tube sealing modification to double lip seal.
Implementation
Lip seal housing
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Outcome of Upgrades Cost avoidance. Improved pump MTBF. The pump has been running for two years. Spare parts availability and local fabrications. Lube oil filling period reduced from days to
hours. Air pockets elimination. Simplicity to maintain and handling.
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Large Seawater Intake Pump Upgrades
Thank you
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