Can GLEN replace an existing QRH without rebuilding the original foundation?

During FEED, the Safe Working Load (SWL) and hook configuration of a Quick Release Mooring Hook (QRH) should be assessed against the project’s technical scope. Key inputs include mooring analysis results, maximum design line loads, mooring line Minimum Breaking Load (MBL), horizontal and vertical line angles, vessel range, terminal operating philosophy and applicable project specifications. Vessel deadweight tonnage alone should not be used as the final basis for selection.

The number of hooks per QRH unit should also reflect the mooring arrangement and the expected number of lines at each dolphin. Project teams can submit vessel data, mooring information, berth conditions and control-interface requirements to GLEN for technical review. Before the specification is finalized, preliminary requirements for SWL, hook quantity, capstan requirements, foundation loads and control interfaces can be defined.

GLEN product range includes QRH, berthing aid systems, mooring load monitoring, environmental monitoring, central monitoring and ship-to-shore link systems.

Before the QRH layout is finalized, the civil designer should obtain the preliminary equipment envelope, base dimensions, anchor-bolt arrangement, horizontal and vertical design reactions, maximum load directions, equipment weight and maintenance-clearance requirements. These data are required to assess foundation dimensions, anchoring conditions, structural loading and available installation space.

For integrated systems, provisions should also be made for local control panels, cable routes, cable entry points, operating access and maintenance access. Early exchange of this information can reduce the risk of redesign after equipment selection. GLEN can provide preliminary foundation and interface information during the engineering stage, with final certified loads and drawings issued after detailed design and project confirmation.

Potentially, yes, subject to the outcome of a retrofit assessment. Many older terminals still have mechanical QRH that remain suitable for service, while PLC, HMI, communication hardware, load indicators and spare parts may be obsolete, discontinued or difficult to maintain. Before an upgrade, GLEN can assess whether the existing mechanical hooks remain suitable and whether the control system can be replaced independently.

Where the mechanical QRH remain serviceable, the upgrade may include a new PLC/HMI, remote release controls, mooring load monitoring, alarms, historical data recording, and communication with the terminal DCS or CMS. GLEN monitoring and control systems can centrally monitor QRH, BAS, EMS and MLMS, supporting equipment status monitoring, alarm management, historical records, remote monitoring and system diagnostics. The systems can also integrate with DCS, SSL, AIS and CCTV.

Before implementation, functional safety, release logic and sensor compatibility should be confirmed.

Reset refers to the method used to return a QRH to its operating position after release.

Manual reset relies primarily on direct operation by personnel and is suitable where the equipment can be accessed safely and manual handling meets project requirements.

Assisted reset uses a balancing or assistance mechanism to reduce the physical effort required, although personnel still complete the reset operation.

Powered reset uses hydraulic, pneumatic or electric actuation to reset the hook, reducing manual intervention at the dolphin.

Automatic reset adds control logic to the powered-reset arrangement so that the reset sequence can be initiated under predefined conditions. Whether automatic reset is used should align with the project safety philosophy, operating permissions and control requirements.

The preferred reset method should be selected according to hook capacity, functional-test frequency, manpower, dolphin accessibility and the owner’s operating requirements. The operating sequence should be clearly defined in the project specification.

GLEN mooring and release systems include QRH, integrated mooring capstans and remote release control systems. QRH support manual and remote release, while the remote release system can support single-hook or group release, real-time hook-status feedback, and integration with CMS, PLC and ESD systems.

Yes. A terminal does not require all subsystems to be supplied by one manufacturer, provided that system interfaces are clearly defined at an early stage. The interface matrix should cover signal types, communication protocols, alarm priorities, command permissions, time synchronization, data ownership and testing responsibilities. Depending on the information-exchange requirements, hardwired signals and open industrial protocols such as Modbus, OPC and OPC-UA may be used.

GLEN CMS can bring QRH, BAS, EMS and MLMS data together on a control-room platform for equipment-status monitoring, alarm management, historical data recording and trend analysis. It can also integrate with DCS, SSL, AIS and CCTV. MLMS can monitor individual mooring-line loads and connect with QRH and CMS, while EMS can provide wind, current, wave, tide and meteorological data.

Defining interfaces early allows EPC contractors to select suitable equipment from different suppliers while reducing commissioning risk during the later stages of the project.

Loss of power, PLC communication or remote control should not result in unintended QRH release. During engineering, the project should define the fail-safe behavior of the mechanical hook, local controls, remote release functions, alarms, status feedback and backup power arrangements. Where required by the project, local manual operation should remain available.

For LNG, LPG and oil terminals, the cause-and-effect logic should distinguish between loss of communication and an emergency release command. The design should also avoid a single failure creating an unsafe release condition.

GLEN quality-management process includes engineering review of project requirements, system interfaces and operating conditions, together with design verification, system-integration review and risk assessment. FAT covers mechanical functions, system integration, alarms and controls, communication and interfaces, software and HMI verification, and may include operational-condition simulation. GLEN also provides installation support, SAT, training, inspection and testing, maintenance, repair and remote technical support.

Final requirements for failure response, alarm logic, control permissions and interface-testing scope should be confirmed during design, FAT and SAT, and incorporated into the project specification, cause-and-effect matrix and ITP.