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H20 Hydrostatic Release Unit (HRU)
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H20 Hydrostatic Release Unit (HRU)

The Hammar H20 is the best-selling HRU in the world, and it has been saving lives on the oceans for more than 30 years. Its safe, reliable, and its simple design has earned more worldwide approval than any other unit.

When you buy a Hammar H20 Hydrostatic Release Unit (HRU), you don't just get the market's best-selling release unit. You also get a sample of our long history and tradition of safety at sea. Hammar has by far the broadest product range on the market.

The H20 needs no annual service, maintenance, or spare parts. You simply install a new unit and dispose of the old once it has reached the end of service life.

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WHAT DOES AN HRU DO?

If the vessel sinks, the increasing water pressure activates the Hammar H20. It automatically releases the liferafts, EPIRBs (Emergency Position Indicating Radio Beacons), or other life-saving appliances it is connected to.

The Hammar H20 is designed to be safe and reliable in all extreme conditions that you and your ship might meet on the oceans. The Manual Release Units (MRU) and Electronic Release Units (ERU) allow for a smooth, controlled release in an early stage of abandoning the ship without compromising the hydrostatic function.

Product Features:

A lashed liferaft will follow the ship down if no mechanism is there to release the lashing; this is the purpose of an HRU. All vessels complying with the SOLAS (Safety for Life at Sea) regulation are obliged to have HRUs on sufficient liferafts for saving the personnel onboard. Not only will the SOLAS HRU release the liferaft, but the Weak Link™ connected to the raft's painter line also activates the liferaft after release, making it available to survivors to board.

The Hammar H20 White Strong Rope withstands forces up to 15kN, and the HRU should release at a depth of between 1,5 to 4 meters. Once the liferaft is set free, the Weak Link™ should hold the painter line to the force of 2,2kN (+/- 0,4kN).

SOLAS defines two different types of HRUs:

Non-disposable, which require service yearly and are generally made of metal.

Disposable, which require no maintenance during its lifetime of 24 or 30 months, such as the Hammar H20.

THE HAMMAR H20 - HOW IT WORKS:

Inside the Hammar H20, a pin under tension sits in a notch of a spring-loaded knife. The pin is attached to the center of a flexible membrane. At the intended depth, water acts on the membrane pushing it inwards and out of the notch. When the pin is fully out of the notch, the blade can instantly spring forward, cutting through the strong rope and releasing the lashing.

The Weak Link™ holds the painter line assuring the necessary pull to inflate the raft as the buoyancy of the liferaft container floats towards the surface. The increased buoyancy of the inflated liferaft will cause the Weak Link™ to break, and the raft can surface.

The Hammar H20 is designed to cut through the White Strong Rope but may, in some applications, also cut the unshielded electrical cable.

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