Hydrostatic Release Units
Thanner offers three different solutions of hydrostatic release units. Disposable HRU, Disposable Remote Activated HRU Systems and Serviceable HRU. For detailed explanation of the three, please continue reading. Do you have any questions related to our services or products, please get in contact.
Disposable Hydrostatic Release Unit
Thanner Disposable Hydrostatic Release Units are all patented units, designed for trouble free installation, reliable function and service free lifetime up to 6 years /72 months , 4 years /48 months ore 2 1/2 years /30 months after correct installation.
The units are all approved to the new MED and SOLAS regulations together with ships wheel approval, USCG, TC and many others. The units are made from stainless steel and UV- resistant plastics to meet the tough requirements of the marine environment. The units operate independently of the life raft buoyancy and is approved for all sizes of life raft! up to a buoyancy load of 1500kgs.
All parts can be recycled and are made from non-toxic materials. Special versions/other release depths are available on request.
Disposable Remote Activated HRU Systems
Thanner Disposable Hydrostatic Release Units for Remote Activation are based on the standard disposable HRU range. The standard units are fitted with adaptor enabling remote activation mechanical, electric and pressure.
One unit alone can act as hydrostatic release, remote and manual unit, which simplifies the installation and increase safe operation.
The units have the same approvals as the standard units.
Mechanical Activation
The HRU has an adapter to which a mechanical connection can be fitted. The mechanical activation could be by a TELEFLEX or MORSE cable or any kind of mechanical connections. This method can be used for limited distances only.
Electric Activation
The HRU has a pyrotechnic activator, which by limited electric power activates the HRU. The power can be supplied either by batteries or the ships emergency supply system, or both as safety back up. The electrice installation is a standard ships installation like a fire alarm system. The activation can be activated by a control box placed in the wheel house. Two wires are necessary for each HRU. No limits of distance from the control box to HRU’s. Programmed priority of release sequence. Close proximity activation at life raft cradle.
Pressure Activation:
The HRU has an adapter to which a pressure line can be connected. The pressure can be supplied from a gas disposal cylinder or a pressure tank. More units can be activated simultaneously or one unit at a time if fead by individual pressure lines. No limit in distance from control panel to HRU.
Serviceable Hydrostatic Release Unit
Thanner Serviceable Hydrostatic Release Units are designed for heavy duty installations, reliable function and no limited lifetime if serviced regularly. Service intervals follow the raft servicing
The units can be manually released and reset, the manual release is only for use during testing, and does not eliminate the need for a slip-hook or pelican-hook. The DK84.1 is approved to the new MED and SOLAS regulations together with ships wheel approval, USCG, TC and many others.
The unit is made from stainless steel and composite polyamid plastic to meet the tough requirements of the marine environment. The unit operates independently of the life raft buoyancy and are approved for any life raft up to a load of 1850 kgs.
All parts can be recycled and are made from non-toxic materiales. Special versions/release depths are available on request. The DK84.1 FN and DK84 RN2 does not comply with MED / SOLAS but have the same main carateristics as DK84.1
None SOLAS versions are available with release depths down to 50m water gauge.
Product Range
Part numbers
Certifcates & Instructions
Hydrostatic Release Units
- Operating head DK99 & DK99S Certificate ISO 15738
- Gas-cylinder valve CV DK99 / DK99S Certificates ISO 15738 and TPED/ADR2017:
- Inflation valve Mark III Certificate ISO 15738-003A rev1
- Inflation valve Mark 5 Certificate ISO 15738-005
- Pressure relief valve OTS-45 Certificate ISO 15738
- Topping up valve clamping OTTC-45 Certificate ISO 15738
- Pressure relief valve OTS-65 Certificate ISO 15738
- Marine Hoses FDC_THANNE_ISO 15738_001