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HRU(Hydrostatic Release Unit )

A hydrostatic release unit allows a liferaft to launch automatically if there isn’t time for crew to launch it manually. 

How it works:
  • The strong white rope is secured to the deck or liferaft cradle and attached to the liferaft lashing with a sliphook. 
  • If the ship sinks, the water pressure will (within 4 metres) activate the sharp knife which  cuts the white rope and the liferaft will float free. 
  • As the ship sinks, theliferaft painter line will be stretched and the liferaft starts to inflate.  
  • The Red Weak Link breaks and survivors can board the floating liferaft.

• Breaking strength of white rope sling: min 15kN.
• Breaking strength of red weak link: 2.2 +/- 0.4 kN

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