Search Sonardyne

Follow us

Products Instruments & Software

Heavy duty release frames

Accessory for RT 6-3000 and RT 6-6000 transponders

Engineered for: Seabed, Structure

Our range of heavy duty acoustic release frames increase the WLL of RT 6-3000 and RT-6000 acoustic release transponders enabling you to lift, lower and release heavy loads onto the seabed, includes structures and specialist equipment.

At a glance

Working Load Limit of 7,500 or 25,000 kg

Breaking Load of 100,000 kg

Choice of depth rating; 4,000 or 12,000 m

Compact size; just over 1 metre long

Industry standard lifting rings

Lift and lower more with you RT 6s

Want to know more?


The Type 7869 release frame increases the Working Load Limit (WLL) of a standard RT 6-3000 or RT 6-6000 to 7,500 kg (at 4:1 safety factor) with a breaking load of 30,000 kg. The Type 7988 release frame has a WLL of 25,000 kg and breaking load of 100,000 kg.

In most cases both types of release frame can be fitted without any modification to the acoustic release itself and is easily assembled in the field.

Manufactured from high strength steel which is galvanised and powder coated, the releases offer excellent corrosion resistance for long term deployment.

Applications for which the acoustic releases have been developed include; civil engineering, offshore construction, offshore renewables, marine salvage, defence and ocean science.


Feature Type 7869 Type 7988
Depth Rating (dependant on RT 6-3000/6000) 3,000 m* (RT 6-3000), 6,000 m (RT 6-6000) 3,000 m* (RT 6-3000), 6,000 m (RT 6-6000)
Working Load Limit (at 4:1 Ratio) 7,500 kg 25,000 kg
Maximum Safe Release Load 11,000 kg 11,000 kg
Breaking Load 30,000 kg 100,000 kg
Proof Load (a Proof Test Certificate is available on request) 15,000 kg 50,000 kg
Mechanical Construction Galvanised steel, painted Galvanised steel, painted
Dimensions – (with RT 6-3000/6000, including lifting rings) (Length x Width x Height) 1190 x 160 x 303 mm (46.9 x 6.3 x 11.9“) 1465 x 265 x 306 mm (57.7 x 10.4 x 12.1“)
Weight of Frame in Air 38 kg 115 kg
Weight of Frame in Air (with RT 6-3000/6000) 58 kg 135 kg
*RT 6-3000 is pressure rated to 4,000 m; however, due to operating range constraints of MF, its use at depths greater than 3,000 m is not recommended.

Need product support? Try our knowledge base

Lift and lower more with you RT 6s