Hammar Hydrostatic Release Unit Green Model HRU for Small Liferafts



Hammar Hydrostatic Release Unit Green Model Small Raft


Please Note: Due to MCA regulations, all HRUs are now date marked on dispatch and therefore, cannot be refunded after purchase

Replace every 2 years  Watch the HAMMAR HRU in action


The Hammar Hydrostatic Release Unit Green Model Small Raft is designed for liferafts from 4 up to 12 persons and outside SOLAS regulations.

For liferafts smaller than 4 persons, please contact the liferaft manufacturer or CM Hammar AB.


The Hammar H20 for small rafts consists of a double-looped white rope line, a release mechanism and a Red Weak Link with a green lower thimble (breaking strength 1,2 +/- 0,4 kN).

The strong white rope of Hammar H20 is secured to the deck or liferaft cradle and attached to the liferaft lashing with a slip hook.

If the ship sinks, the water pressure will, within approx. 4 metres, activate a sharp knife, that cuts the white strong rope and the liferaft will float free. As the ship sinks, the liferaft painter line will be stretched and the liferaft starts to inflate.

The Red Weak Link breaks and survivors can board the floating liferaft.

2 Year Life


Servicing Intervals

The Hammar H20 needs no annual service, maintenance or spare parts, but MUST BE REPLACED EVERY TWO YEARS. The HRU will be dated marked on dispatch of your purchase and will expire 2 years from this date.



The Hammar H20 Hydrostatic release units are approved worldwide, and fulfil the requirements of the SOLAS 74/96 Convention, Reg. III/4 LSA Code, MO Res. MSC. 48/(66), IMO Res. MSC. 81(70), approved by EU Directive 96/98 EC on Marine Equipment has a NATO stock number.

Release depth 1,5 – 4,0 metres according to IMO/SOLAS regulations. The required certificates can be downloaded under Approvals.



Delivery Information

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