Every vessel is designed with mooring arrangements. The arrangements aid wires and ropes of recommended strength can carefully help to moor alongside buoy, berth or jetty. Basically, a vessel has to be positioned with a jetty or berth in-between mooring buoys, to a mooring buoy, to another barge or ship and then made fast. Some of the standard methods of mooring offered by a mooring rope manufacturer include conventional mooring, Mediterranean mooring and running mooring.
Let us explain these methods one by one:
In this technique, the ship’s bow uses both its anchors. While the stern is secured for buoying around it. In this approach, initially, vessel approaches the final position of a berth at a 90-degree angle from forward to ship’s final direction of berthing. The starboard anchor is now let go at a pre-decided destination while the boat is making progress or headway. Required amount of cable is paid plus astern propulsion too is operated simultaneously for stopping the vessel.
Once the vessel is stopped, the port anchor is released, and thus vessel positions its stern along with the centerline. To align the vessel along the centerline port cable is paid out while starboard cable is heaved in with astern propulsion.
The engines and helm are used carefully during this maneuver for ensuring the stern is swinging clear of any of the buoys. During the process of un-berthing, the anchor cables are pulled in, for moving the vessel forward, and weight is put on the windward lines. This maneuver, as per the dock lines manufacturer, requires efficiency and skilled operation of the crew of the ship as mooring equipment’s weight can be very immense.
In this mooring type, a pre-calculated position is approached and defined by engine movements. Initially, the bow is made to head towards the berth, and the starboard anchor is released in that position. Then the engines are run astern while the port anchor is released at the destined port. The vessel falls aft and swings towards starboard. So, the ship is controlled through both anchors as it advances the quay.
Moorings are kept tight through anchor cables. The vessel positioning is such that mooring gets completed with four shackles present on each anchor. Often, the tide is used for controlling the drift of the vessel towards quay while positioning it through paying or heaving out on one of the anchors.
Running maneuver requires short duration than Mediterranean mooring and provides more control to the vessel. The starboard anchor of the ship is released at a point almost four to five shackles from the bow’s final position and about nine chains paid out while moving ahead on engines. As the vessels fall astern with the tide, the port anchor is let go, and the starboard anchor is retched onto five shackles.
This method restricts the swinging room and minimizes the load on the windlass.
There are some more methods as well. However, these three are most common in the mooring world.