Acoustic Load Shackle
ALS-2.0

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 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