Seakeeper 40 Operation Manual (90716-1)
7.0 Specifications and Summary
| Seakeeper 40 | |
|---|---|
| Rated RPM | 5,150 RPM |
| Angular Momentum at Rated RPM | 40,000 N-m-s |
| Anti-Rolling Torque at Rated RPM | 104,720 N-m |
| Spool-up Time to Rated Speed | 70 minutes (5,150 RPM) |
| Spool-up Time to Stabilization | 49 minutes (4,380 RPM) |
| Spool-up Power AC Motor DC Control | 5,000 Watts Max 240 Watts |
| Operating Power AC Motor (Sea state dependent) DC Control | 1,900-4,400 Watts 240 Watts |
| Voltage AC Input DC Input | 208-230 VAC (±10%), 50/60 Hz, Single Phase, 30 A 24 VDC @ 15 A (Controls) and 24 VDC @ 20 A (Seawater Pump) |
| Seawater Supply to Heat Exchanger | 15 GPM (57 LPM) maximum 13 GPM (49 LPM) minimum |
| Ambient Air Temperature | 32˚ – 140˚F (0 – 60˚C) |
| Weight | 4,074 lbs (1,848 kg) |
| Envelope Dimensions | 54.3 L X 55.9 W X 40.6 H (inches) 1.38 L x 1.42 W x 1.04 H (meters) |
| Noise Output | At full operating RPM, steady state noise measured in the factory at a 1-meter distance measures 72-74 dBC (sound levels may be higher during spool-up). |
Arrangement
The Seakeeper 40 consists of the Flywheel, Enclosure, Foundation, Electronics, Brake, Cooling, and Cover Subsystems.
Installation Location
The Seakeeper is a torque device and does not have to be installed in a specific hull location or on the centerline. However, the Seakeeper should not be installed forward of the longitudinal center of gravity in a planing vessel.
Mounting Dimensions
See Drawing No. 90714 – Seakeeper 40 Bolt-In Installation Details.
Loads
The installer is responsible for designing the foundation to which the Seakeeper is attached and for ensuring that this foundation can safely transfer the concentrated Seakeeper loads from the frame to the adjacent hull structure. Loads that the Seakeeper imposes on the hull structure are explained on Drawing No. 90714 – Seakeeper 40 Bolt-In Installation Details; these loads do NOT include vessel motion accelerations, such as vertical slam loads which can be high for higher speed vessels.
Cooling
The Seakeeper bearings, Motor Drive Box, and hydraulic manifold are cooled by a closed water / glycol mix cooling loop that incorporates a seawater heat exchanger. The installer is responsible for providing 13 – 15 GPM (49 – 57 LPM) raw water at ambient sea temperature and a maximum pressure of 20 psi (1.4 bar) to the heat exchanger.
Electrical
The installer is responsible for supplying 208-230 VAC, 50/60 Hz, single phase power on a (30 A for Seakeeper 40) service to the Motor Drive Box, 24 VDC at 15 A service to the Seakeeper Control System, and 24 VDC at 20 A service for the DC Seawater Pump. Separate circuit breakers should be used for each Motor Drive Box in multiple Seakeeper installations. Similarly, separate circuit breakers should be used for each Seakeeper Control System and DC Seawater Pump in multiple Seakeeper installations.
Operator Controls
A ConnectBox user interface or a customer-supplied MFD or optional 5″ display is used to start, operate, monitor, and shutdown the Seakeeper.
Performance
Reduction of boat roll is a function of the boat’s displacement, transverse metacentric height (GMT) and hull damping as well as the operating conditions (speed and heading with respect to waves) and sea state. The Seakeeper controller regulates the active hydraulic brake to ensure the Seakeeper’s anti-roll torque is maximized regardless of hull characteristics or operating conditions.
Alarm and Monitoring
Sensors, alarms and shutdowns are provided to allow unattended operation. Sensors measure Seakeeper and drive temperatures, vacuum pressure, gimbal angle, brake pressure, and ship motion. The Seakeeper controller sends sensor values and alarm information to the display and also locks the brake and shuts down the motor drive in the event of an alarm condition. Seakeeper operating history during faults or alarms is recorded in the controller’s memory for subsequent recall if service is needed. Seakeeper may access the Seakeeper’s software to gather run hours, bearing loading, and hull slamming information.
Safety
The brake automatically locks the Seakeeper so it cannot generate excessive anti-rolling torque loads in the event of a system fault or alarm, loss of electrical power or loss of brake pressure. The brake can be locked from the Display or by shutting off AC and DC power at the supply breakers.