Sonardyne Flotation Collars (Compatt 6, DPT 6, AMT, PIES)
Sonardyne’s range of subsurface floatation collars enable acoustic navigation and positioning transponders to be deployed, moored on the seabed and then recovered to the surface.
Description
The floats are compatible with all Sonardyne’s latest generation Compatt 6 and DPT Wideband transponders as well as previous generation Mk 5 & 4 Compatts. They can be used with directional and omni-directional transducer types.
Manufactured from high performance materials appropriate to the required depth rating, each float assembly comes in two halves and is clamped around the transponder using stainless steel fixings.
Bright colours ensure good visibility, either when subsea and viewed from an ROV’s camera or when floating on the surface prior to recovery.
Once on the surface, the floatation collar is designed so that the transponder floats in a downward position insuring that the acoustic transducer is kept submerged. This can assist with relocating the transponder using a vessel-based acoustic positioning system and also protects the acoustic transducer during recovery back onboard.
Type 5807 is a 5,000 metre depth rated floatation collar designed specifically for use with Sonardyne’s range of Directional Compatt 5 and DPT acoustic transponders. It has improved hydro-dynamic properties, permitting a 50% faster speed of ascent then earlier models, saving vessel time.
The unique shape of the Type 5807 floatation collar allows a transponder to be installed such that the unit is acoustically shielded from localised noise interference and also afforded increased protection from accidental physical damage whilst deployed.
Technical information
| Depth | 3,000 metres | 5,000 metres | 7,000 metres |
| Weight in Air | 64.0 kg | 64.2 kg | 64.0 kg |
| Nett buoyancy | 32.7 kg | 32.1 kg | 27.0 kg |
| Dimensions (Length x Width x Depth) | 595 x 445 x 445 mm | 595 x 445 x 445 mm | 595 x 445 x 445 mm |
| Part Number | 870-0251 | 870-0378 | 870-0377 |
Low Drag Float
Subsea floatation collars enable acoustic navigation and positioning transponders to be deployed, moored on the seabed and then recovered to the surface.
The low drag is a 5,000 metre depth rated floatation collar designed specifically for use with our range of Directional Compatt 6, AMT 6 and DPT 6 acoustic transponders. It has improved hydro-dynamic properties, permitting a 50% faster speed of ascent then earlier models, saving vessel time.
The unique shape of the the low drag floatation collar allows a transponder to be installed such that the unit is acoustically shielded from localised noise interference and also afforded increased protection from accidental physical damage whilst deployed.
Each float assembly comes in two halves and is clamped around a Compatt, AMT or DPT transponder using stainless steel fixings. Bright colours ensure good visibility, either when viewed underwater from an ROV’s camera or when on the surface prior to recovery.
| Type Number | 5807 |
| Depth Rating | 5,000 metres |
| Weight In Air | 61 kg |
| Nett Buoyancy | 35 kg |
| Dimensions (Length x Width x Depth) | 650 x 500 x 500 mm |
| Ascent Rate | 1.5 m/s (typical) |
| Part Number | 870-0000 |
Ultra Low Drag Float
The ultra low drag light bulb shaped float offers a significant reduction of the deflection caused by water currents and dramatically improves the stability of the transponder. The levels of both the deflection and stability directly affect the quality of the achievable positioning. The light bulb float therefore ensures optimum performance from the seabed installed transponders.
The ultra low drag and highly stable float further allows users to deploy transponders much higher off the seabed increasing the achievable acoustic range. This reduces the required number of transponders enabling life of field positioning without requiring complicated deflection correction methods.
The light bulb float has been stringently tested in order to determine its deflection and stability using various strop lengths and seabed current strengths. A report of the wind tunnel and CFD analysis is available on request from Sonardyne. Results show that in a 0.4 m/s current using a 10 m length strop, the new float design produces less than 1 m deflection. This is much improved over the standard float whose deflection would be well over 3 m in the same scenario.
The float is compatible with all Sonardyne’s latest generation Compatt 6 transponders. Bright colours offer good visibility, either when subsea and viewed from an ROV’s camera or when floating on the surface prior to recovery.
| Depth | 3,000 metres |
| Weight In Air | 60.5 kg |
| Nett Buoyancy | 34.5 kg |
| Dimensions (Length x Width) | 699 x 600 mm |
| Part Number | 870-0017 |
