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Hayward Tyler Retrofitted Seawater Lift Pump Submersible Motors for Improved Reliability
Hayward Tyler was called upon to help support one of the largest and most complex deep water semi-submersible platforms in the Gulf of Mexico (GoM). The platform was experiencing issues with their existing submersible motors due to an overheating issue.
Hayward Tyler engineers reviewed the original (non-HT) installation and proposed a replacement submersible motor to fit in the same footprint. The HT motor provided improved cooling performance which reduced the Non-Productive Time (NPT). Additional instrumentation was supplied including RTD’s and PT100’s to allow the internal motor and winding temperatures to be closely monitored. Additionally, the use of a header tank instead of a diaphragm allowed the motor to be monitored for excessive leakage that would be detrimental to the motor performance.
An environmentally friendly water/glycol mix is used for cooling inside the motor.
Hayward Tyler supplied a highly experienced field service supervisor, during the COVID-19 global lockdown, to oversee the installation and commissioning of the motors. This included post-commissioning follow-up on evaluating the performance of the motors to ensure the root cause of the original motor failures was fully eliminated.
Project Summary
SITE/LOCATION:
- Gulf of Mexico
- Deep Water Semi-Submersible Platform
SOLUTION:
- Design, manufacture and install 2 submersible motors into the existing footprint
- Improve cooling across the motor to reduce NPT
- Supply additional instrumentation for motor condition monitoring
- Use environmentally friendly water/glycol to cool the motors
- Supply on-site supervision to ensure seamless installation
MOTOR DESIGN DETAILS:
- Qty- 2 Water/Glycol filled submersible motors
- Rated Power: 1475hp (1.1MW)
- Power Supply: 4160V / 60Hz / 3ph
- Starting Method: Direct Online (DOL)
- Max Ambient Water Temperature: 86°F (30°C)
- Speed: 880 rpm
- Materials: Super Duplex
- Max Pump Thrust: 45,500lbs
Project Data Sheet
| Project | Replacement submersible motor with improved cooling |
| Product | Submersible Motors with a header tank and shipping cradle |
| Quantity | Two (2) |
Mechanical Standards
| Pump Specification | API 610 |
| Machinery | Machinery Directive 2006/42/EC |
| Material Specifications | BS EN 10088, 10028, BS 970 |
| Chemical and Mechanical Certification | EN 10204 Type 3.1 |
| Rotor Balancing | API 610 / ISO 1940 |
| Non-Destructive Testing | SNT-TC-1AA, ASME Code Section V |
| Internal Fasteners | ISO 3506 |
Testing Standard
| Testing in accordance with: | IEC 60024-2 MG-1-2006 API 610 |
Motor Details
| Design Standard | BS EN 60034 |
| Motor Rating | 1100kW (1475hp) |
| Nominal Speed | 880 rpm |
| Power Supply | 4160 V / 3 ph / 60 Hz |
| Motor Full Load Current | 238A |
| Full Load Efficiency | 90.4% |
| Materials of Construction | Wetted- S.Duplex SS |
| Circulation Method | Thrust bearing as aux. impeller |
| Approx. Weight | 7,650kg |
| Direction of Rotation | CCW on drive end |
| Starting Method | Direct Online (DOL) |
| Power Cable Lengths | 55m |
| Pump Flange Connection | 27.2″ |
Hydraulic Conditions
| Max. Ambient Water Temperature | 30°C (86°F) |
| Duty Flow | 3390.3m3 / hr |
| Minimum Flow | 1703.4m3 / hr |
| Rated Pump Thrust | 29,689lbs |
| Max. Pump Thrust | 45,516lbs |
| Min. Pump Thrust | 19,215lbs |
