Seakeeper 9 Installation Manual (90222-11); S/N 9-233-4900 to Current
2.2 Selection of Installation Location
The Seakeeper should be installed aft of amidships to minimize high acceleration loadings due to hull/wave impacts during operation at high speed or in large waves. If the only possible Seakeeper location is forward of amidships then the installer should have Seakeeper review the installation location prior to finalizing the design.
Seakeeper can only assess installation location regarding its impact on Seakeeper operation and serviceability. Seakeeper cannot determine how the installation location will affect the vessel static or directional stability other than cyclic roll reduction. The Installer is responsible for considering the Seakeeper’s effect on the Center of Gravity location, trim, overall stability, and performance of the vessel.
The Installer is solely responsible for ensuring that the Seakeeper is properly located and installed on the vessel foundation with an adequate margin of safety for the specified design loads and vessel operating characteristics.
Selection of mounting location of the Seakeeper should consider the following desirable features:
- Adequate service access for scheduled maintenances and overhaul of the Seakeeper 9 is required. See Figure 4 and Drawing No. 90225 – Seakeeper 9 Bolt-In Installation Details for service clearance requirements.
- The Seakeeper should be installed in a dry space to minimize effects of corrosion.
- Clearance for all recommended scheduled maintenance and any repairs that may be necessary (See Figure 3).
VIEWS SHOWING RECOMMENDED CLEARANCES AROUND THE SEAKEEPER FOR USE OF HANDTOOLS, EASE OF MAINTENANCE, INSTALLATION, AND PROPER OPERATION.
Figure 3 – Seakeeper 9 Installed Clearance Considerations
(Measurements in brackets are in inches; measurements not in brackets are in millimeters)
Refer to Figure 4 for required clearances to transverse beams. If a transverse beam is located under the forward brace, it must be 1 in. (25 mm) from the edge of the Seakeeper Frame to provide the necessary clearance for the swing of the motor power cable during the Seakeeper’s precession. Clearances aft of the Seakeeper are shown to provide access for regular scheduled maintenance.
2.2.1 Overhead Clearance Considerations
Access above the Seakeeper 9 must be considered for maintenance and service space. Figure 5 shows space considerations around and above Seakeepers installed below deck surface.
2.2.2 Noise/Soundproofing
Seakeeper 9 noise has been measured under steady state conditions (no wave load) in Seakeeper‘s Engineering Lab and in our Factory Demo Boat. The steady state noise is typically <70 dCB at 1 meter. As the frequencies emitting the highest sound pressures are low (like other marine machinery), it is recommended that the Seakeeper be installed in an enclosed space such as a machinery space, lazarette, or bilge. If additional noise reduction is needed, sound proofing insulation can be used in the space around the Seakeeper unit.