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Quick release mooring hooks

Strainstall's quick release mooring hooks provide safe mooring line release, offering reliable operation within the harshest of marine environments.

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Our quick release mooring hooks help to ensure safe operations as well as asset protection in the event of any incident. In oil and gas terminals, their use during cargo handling is recommended by the Oil Companies’ International Marine Forum (OCIMF) and The Society of International Gas Tanker and Terminal Operators (SIGTTO), as they form the basis of a safe mooring system.

Designed to provide ease of installation and maintenance as well as being able to incorporate mooring load monitoring, they can be either free standing or buoy mounted and are supplied as standard or pelican hooks. Optionally, electric, hydraulic or pneumatic remote release systems are available, with an integrated capstan to assist heaving in the mooring lines from the vessel.

The complete range of quick release mooring hooks has been designed to withstand the harshest of marine environments and features simple release in both manual and remote release units.

Standard hooks are available in single, double, triple, quadruple, double back-to-back and quadruple back-to-back. Safe working loads vary from 30 tonnes to 200 tonnes, with proof loads of 1.5 times the safe working load.

Benefits of quick release mooring hooks:

  • Protects personnel and infrastructure
  • Provides safe mooring line release
  • Designed to withstand harsh marine environment
  • Simple remote or manual release options
  • Wide range of movement (horizontal and vertical)
  • Easy to install and maintain
  • Can incorporate mooring load monitoring
  • Recommended by OCIMF and SIGTTO

Download Strainstall's complete jetty monitoring and management systems brochure, including quick release hooks (3.2MB).


"The Strainstall system will really modernise our operations, an investment that helps to further protect the safety of our workforce."

Martin Putman, port manager of Portsmouth International Port

How Strainstall's quick release hooks work

Quick release hooks form the basis of any safe mooring system and enable a vessel to be securely moored alongside a jetty, but with the facility to quickly and safely release the mooring lines, even when they are at full tension.

The Strainstall quick release mooring hooks are unique as they have been designed to provide full mechanical protection to the release mechanisms and incorporate load monitoring. They have also been upgraded in material selection and manufacture to provide safe and reliable operation in the environments encountered on jetties. A unit usually comprises of single, double, triple or quadruple hooks as required by the layout of the terminal, although other configurations can be supplied.

In addition to the standard local manual hook release, Strainstall offers electric, hydraulic and pneumatic remote release systems, with the activation devices totally integrated into the hook assembly. This allows the hooks to be released from a remote location as well as an option of activating a button on the motor starter enclosure on the rear of the hook.

Each hook is proof tested to 150% of its rated load, with the release mechanism tested at full load rating at our own test facility, witnessed by a surveyor from an independent Classification Society. They are also supplied with material certification and traceability.

Local displays of the mooring load tensions and audible and visual alarms can also be incorporated into the hook. In addition, when the hooks are equipped with mooring load monitoring, an in-hook load cell calibration facility is provided, eliminating the need for separate and costly testing of the system.

Quick release hook (QRH) servicing

Strainstall provides a complete quick release hook (QRH) and jetty system servicing package to help maximise the performance and safety of ports and terminals.

Supporting everything from lubrication to full service and inspection we will also advise on any design upgrades which can be integrated during servicing allowing for continual operation and enabling ports to stay ahead of any legislative changes.

Strainstall's jetty system maintenance package includes:

  • Onsite inspections
  • System upgrades
  • Scheduled servicing
  • Spare parts
  • Training
  • Technical expertise

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