The Acoustic Load Shackle is designed for subsea operations where load monitoring is required, either for short term operations lowering an item to the seabed or for longer periods monitoring dynamic loads.
The Acoustic Shackle assembly comprises a Crosby lifting shackle with a modified pin. The standard pin is replaced by a Load Cell machined from stainless steel. On the side of the Load Cell there is a mounting bracket to hold an acoustic beacon, which is clamped in place using stainless steel brackets. The shackle is provided with a bobbin which can be machined to bespoke dimensions.
The load on the shackle is measured by strain gauges connected to a digital amplifier which is housed within the head of the shackle pin and pressure tested to 200bar. The amplifier connects via subsea cable connectors to the acoustic beacon which in turn transmits signals to the surface PAM unit at user selectable sample rates.