Hammar H20HRU LifeRaft Hydrostatic Release System

Hammar H20HRU Hydrostatic Release System is a SOLAS-approved, automatic liferaft release device designed to ensure float-free deployment if a vessel sinks. Installed between the liferaft securing straps and the vessel, the H20HRU automatically releases the liferaft at a predefined depth, allowing it to surface, inflate, and remain accessible even when manual launch is impossible. This single-use, maintenance-free unit is trusted worldwide on commercial vessels, offshore installations, and safety-critical marine applications.

Key Features:

• Automatic Float-Free Release: Activates at 1.5–4.0 m depth in compliance with SOLAS and IMO requirements, ensuring liferaft deployment without crew intervention.
• Maintenance-Free, Sealed Design: No annual servicing, no moving parts exposed to corrosion. The unit is fully sealed and replaced every 2 years.
• SOLAS / IMO / Transport Canada Approved: Certified for global commercial and offshore use under SOLAS 74, IMO resolutions, EU Marine Equipment Directive, and Transport Canada approvals.
• Red Weak Link™ Safety System: Engineered breaking strength of 2.2 ± 0.4 kN (standard model) ensures reliable raft inflation followed by safe separation from the vessel.
• Universal Liferaft Compatibility: Designed for liferafts rated from 6 to 150 persons using standard cradle and lashing systems.
• Durable Marine Construction: Glass-fiber reinforced nylon body with an internal stainless-steel blade, built to withstand long-term exposure to UV, saltwater, and extreme marine environments.
• Clear Expiry Marking System: Integrated month/year marking tabs must be scratched at installation to indicate the mandatory 2-year service life, ensuring inspection compliance.

Specifications:

• Product Type: Hydrostatic Release Unit (HRU)
• Release Depth: 1.5 – 4.0 m (5 – 13 ft)
• Maximum Buoy Load: 3,750 lb (1,700 kg)
• Weak Link Breaking Strength (Standard): 2.2 ± 0.4 kN
• Weak Link (Small Raft Version): 1.2 ± 0.4 kN (green lower thimble)
• Rope Sling Strength: >15 kN
• Dimensions: 18 × 9 × 7 cm
• Service Life: 2 years from month of installation
• Materials: Glass-fiber reinforced nylon body, stainless-steel cutting blade
• Approvals: SOLAS 74, IMO MSC.48(66), IMO MSC.81(70), EU MED 96/98 EC, Transport Canada, NATO Stock Number

Trade-offs / Limitations:

• Single-Use Device: The H20HRU must be replaced after activation or at 2-year expiry, regardless of condition.
• Not for Very Small Rafts: Liferafts under 4 persons are not supported—consult the liferaft manufacturer for alternatives.

Compatibility / Installation Notes:

• Compatible with most liferaft cradles using manual release hooks or slip hooks
• Requires shackles (not included) for deck/cradle mounting and painter line connection
• Expiry date must be physically marked on the unit at installation to remain compliant
• Do not paint or modify the unit
• Installation should follow the official Hammar H20 manual exactly