Machine translation from English source
Choosing a safe workplace
A safe workplace must be selected for each delivery operation. It is safer to work on the downwind side of the installation than on the weather side. Even where ASOG shows that vessels can operate on the weather side, it is always preferable to install on the leeward side. Other elements to consider when selecting a safe work location include the position and reach of installation cranes, obstacles in the installation path, and interaction with installation motors.
Safe workspace
The most appropriate course for the vessel should be selected based on the fact that moving forward or backward may be required to quickly exit the installation. This can be an advantage to provide a good trim vector by positioning the vessel so that the surrounding forces are counteracted by a steady thrust.
Escape route
An evacuation route must be determined. The evacuation route must provide a clear trajectory for the vessel during normal or emergency departure from the installation site. Other vessels should stay away from escape routes.
The escape route should, if possible, extend 500 meters from the installation site. Where conditions are required (due to critical failures), consideration should be given to safely removing the facility from the site, taking into account the surrounding underground infrastructure.
Environmental Monitoring Forces (ship electromechanical)
Environmental forces are never constant. Wind, current and swell must be constantly monitored, as well as their effect on position holding. Electronic control methods, such as wind sensors and net force vectors, provide DP control using built-in devices, but these methods must be supported by visual control and prediction.
Great care should be taken where there is a possibility of sudden changes in wind and/or current. Preventive measures may require the ship to cease operations during these periods and move to a safe place
Maintaining a safe workplace
A safe work environment must be maintained at all times during installation.
In particular, this will require constant vigilance against the possible accumulation of a number of hazards. These may include, for example, those associated with environmental forces and other potential hazards such as shipping, air transport or cargo operations. This will also require the vessel to operate within its design parameters and within the range of the vessel's DP capability schedules. The possibility of an unrestricted view of the work area from the DPO position should be considered. Video surveillance or an observer can provide assistance. Worst case failure case (DP) should be taken into account
Onboard mechanical, electrical and electronic support (ship electrical engineer)
If the vessel is within 500 meters of the installation site, a mechanic must be on duty in the engine room. Whether the vessel is equipped with a UMS or not, a mechanic must be located in the engine control room. Good practice requires a manned engine room for all DP operations. When the vessel is within the 500 meter zone, electricians and, where possible, electronics officers should be on duty.
Critical and permissible deviations of the vessel
Critical and acceptable excursion limits should be established. The critical limit should not exceed half the separation distance between the vessel and the installation. The permissible limit should not exceed half of the critical limit
