Description
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 Load 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.
Key features
- 1500m operating depth
- Spread spectrum acoustic beacon
- Robust design
Applications
- Subsea Moorings
- Cable laying operations
- Grapnel runs
Dimensional data
| Load Capacity Tonnes | Part Number | A | B | C | ØD | E | F | G | H | I | Proof Test (% Load Capacity) | Accuracy (%) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 25 | 0001 – 1250 | 225 | 125 | 44.5 | 50 | 162 | 73 | 335 | 100 | 340 | 150 | 1.0 |
| 55 | 0001 – 1251 | 327 | 125 | 66.5 | 70 | 246 | 105 | 420 | 100 | 340 | 150 | 1.0 |
| 85 | 0001 – 1252 | 365 | 125 | 76 | 82 | 308 | 127 | 460 | 100 | 340 | 150 | 1.0 |
| 120 | 0001 – 1253 | 416 | 125 | 89 | 95 | 347 | 150 | 518 | 100 | 340 | 150 | 1.0 |
| 200 | 0001 – 1254 | 530 | 140 | 120 | 125 | 450 | 180 | 605 | 100 | 340 | 150 | 1.0 |
| 300 | 0001 – 1255 | 565 | 150 | 130 | 150 | 534 | 205 | 655 | 100 | 340 | 150 | 1.0 |
Product specification
| WWL | 25t to 250t |
| Operating Depth | 1500m |
| Battery: | 14.8V Rechargeable 8 Cell 5.4Ah Lithium Ion |
| Self-Discharge: | <5% per month at 20˚C / <10% per month at 30˚C / <20% per month at 40˚C |
| Estimated Battery Life: | 72,000 samples or 2 months (whichever is sooner) |
| Operating Temperature: | Charging: 0˚C to +45˚C / Discharging: -20˚C to +60˚C |
| Storage Temperature: | -20˚C to + 30˚C for 1 year / -20˚C to + 45˚C for 3 months |
| Material: | 17-4PH H1150+1150 Stainless Steel |
| Calibration: | Supplied with calibration, proof load and test certificates to traceable to UKCA BS EN ISO 7500-1 2018 |