2.3 Selection of Installation Method

The Seakeeper 18 can be affixed to the hull structure using two methods:

1. Bolt-in installation or
2. Bond-in (Saddle) installation. See figures below.

OPTION 1 – DIRECT FASTENING OF SEAKEEPER FOUNDATION TO SHIP’S STRUCTURE

Option 1 would be applied when a metal structure or laminated tapping plates are available for attachment. The Seakeeper 18 frame would fasten directly to hull structure or plates using isolation gaskets for metal-to-metal contacts and (16) M14X2.0 fasteners. Depending on the structure to which the Seakeeper is fastened, blind threaded holes or thru-bolting can be utilized.

OPTION 2 – SADDLE INSTALLATION (4 PLACES)

Option 2 would most commonly be used on a FRP hull structure. For this option, four 12.9 in. (327 mm) long x 4.9 in. (125 mm) wide x 6.7 in. (170 mm) height saddles (P/N 90547) are bonded to properly spaced and prepared structural members that are an integral part of the hull structure. Seakeeper recommends using a structural adhesive with a lap shear strength of 2,000 psi (13.8 MPa) or greater. Careful consideration should be exercised by the installer while selecting the appropriate adhesive.  Compatibility with the Seakeeper’s cast aluminum A356-T6 saddles, hull structure and pot life are three important factors to consider. Proper surface preparation in accordance with adhesive manufacturer’s recommendations prior to installation is very important. Recommended adhesives can be found in Seakeeper Technical Bulletin 90382 – Structural Adhesive Recommendations.