Technical Manual
22
Frame Assembly
Description
Datem’s complete frame assembly consists of three main sections: The sub
frame, base frame and top frame. Some clients provide alternative frames and
in such cases the following information will not be valid.
The sub frame provides the mounting point for the thruster. This part of the
frame is constructed in mild steel, and painted using a marine grade of high-
visibility yellow paint. This frame is then welded or bolted to the mild steel
base frame.
The base frame provides the mounting point for the sub frame and the Pod
carrier which houses the electronics pod, inverter pod and Power Pod. This
part of the frame is constructed in mild steel, and painted using a marine
grade of high-visibility yellow paint.
The top frame section provides a means of attaching the lifting equipment to
the unit, with some degree of protection against low energy impact. This part
of the frame is completely constructed from a marine grade of stainless steel,
using predominantly tubular structures for maximum strength.
To protect the dissimilar metals used in the construction of the frames and
base, sacrificial anodes are mounted to the base. These should corrode at an
accelerated rate, in order to protect the main structure. As the anodes only
provide protection whilst the frame is submersed, it should be washed down
with clean, salt-free water whenever it is returned to the deck of the ship.
Specification
Sub Frame: Painted Mild Steel
Base Frame: Painted Mild Steel.
Assembly
General
When assembling a frame, it is recommended to leave all nuts and bolts loose
initially as the individual parts are put together. This allows all the joints to
find their best position to reduce stress in individual frame members. To
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