Various moorings

VARIOUS MOORINGS

 

 

 

 

Open moor

 

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Vessel anchored with both anchors leading ahead.

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Both the anchors remain 1point on the bow.

 

 

Procedures

 

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Approach the anchorage with wind or current on one bow.

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Weather anchor or upstream anchor is let go on the run (1).

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The headway continued and cable is laid up 1/3 rd of the final length of the cable.

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The second anchor is let go (2).

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First anchor snubbed at the gypsy.

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The vessel brings-to on her weather cable. It gradually grows taut to windward.

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Bow develops a rapid swing into the stream or wind.

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Both the anchors are veered.

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Finally the anchors are one point at each bow.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Standing moor, ordinary moor, dropping moor, straight moor

bullet Vessel required to moor with bridge along the dotted line.
bullet Stream ahead.
bullet Port anchor-5 shackles, stbd anchor-4 shackles.

 

Procedure:

bullet Head to stream or wind.
bullet When both are present, head to one has stronger effect.
bullet With sufficient headway, take vessel to position 1.
bullet Position-1 is roughly 5 shackles minus half ship's length beyond line AB.
bullet Let go port anchor.
bullet The vessel drifts downstream, render port cable to nine shackles, the sum of two lengths.
bullet She is brought up on her cable.
bullet Then the starboard anchor is let go at position-2.
bullet Vessel then moves to the position by rendering or veering the starboard cable and heaving in four shackles on the riding cable.
bullet Engines may be used to reduce stress on the windlass.

 

 

 

 

 

 

 

 

Running moor, flying moor

bullet Vessel required to moor with bridge along the dotted line.
bullet Stream ahead.
bullet Port anchor-5 shackles, starboard anchor-4 shackles.

 

Procedure:

bullet Head to stream or wind.
bullet When both are present, head to one has stronger effect.
bullet Let go starboard anchor on run, when vessel is 4 shackles and half of ship's length (1).
bullet The cable is rendered as the vessel moves upstream.
bullet The cable is not allowed to be tighten, as bow will cant to starboard.
bullet The cable is rendered or veered 9 shackles and vessel moves to position-2.
bullet In position-2, port anchor is let go.
bullet The vessel moves stern.
bullet Five shackles weighed on lee (starboard) cable and five shackles veered on riding cable.
bullet The vessel is then brought up on her riding cable at position-3.

 

 

 

 

 

 

Advantages of mooring

bullet Vessel occupies little swinging room.
bullet Vessel turns almost to her length about stem.
bullet Scopes can be pre-adjusted for the prevailing strength of wind or stream.
bullet Scope of each cable is estimated in the same way as single anchor.

 

Disadvantages

bullet Lee anchor has no value to ship if headwind increases or vessel drags.
bullet Risk of getting a foul hawse.

 

 

 

Special precautions

bullet Maintain a constant watch to prevent foul hawse.
bullet Determine foul arc and clear arc.
bullet Vessel should always swing to clear arc on each tidal change.
bullet Use engine to give vessel correct sheer.
bullet Keep eye on the weather.
bullet Know the times of tide change.

 

 

Preference:

I will prefer standing moor. Because:

bullet Safer
bullet More control on the ship.
bullet The anchor is let go after vessel stopped.
bullet There is no possibility of damage due to anchoring at headway.

 

 

 

 

 

 

Baltic moor

bullet Employed alongside a quay.
bullet Used when construction of the berth is no sufficiently strong enough to withstand ranging in bad weather.
bullet Can be employed for berthing a vessel in an onshore gale wind.

Procedures:

bullet For a average size merchant ship, a 25-30mm wire is passed from the after ends on the poop, along the offshore side, outside and clear of everything.
bullet Offshore anchor is cockbilled.
bullet A man is send overside on a chair to secure the wire with the anchor, preferably at the shackle.
bullet The wire is secured with ship's rail by sail twine in bights.
bullet The aft end of the wire is sent to a wrapping barrel, ready for heaving slack wire.
bullet When the stem is abreast the position of the quay where the bridge will be positioned, the anchor is let go.
bullet The vessel is still on headway.
bullet About half a ship's length of the cable, the cable is surged and then snubbed.
bullet The wire is hove-in aft.
bullet The onshore wind will drift the vessel to the berth.
bullet The scope of the cable and the wire is adjusted and veered slowly until the ship is alongside.
bullet Distance of ship, length of cable and wire must be considered.
bullet Normally, the anchor is dropped at a distance 2/3 shackles length of the cable from the quay, which may vary depending on the prevailing circumstance.

 

 

 

 

 

 

Mediterranean moor

bullet Method of securing a vessel stern to the berth.
bullet Both the anchors leading ahead to hold the bow in position.
bullet The approach should preferably be made with the berth on port side.
bullet The starboard anchor is let go about two ships length from the berth(1).
bullet The vessel continues to move ahead.
bullet Starboard helm is applied and the cable is veered.
bullet The engines are then put astern and the port anchor is let go (2).
bullet As the vessel comes astern, transverse thrust swings the stern to port towards the berth.
bullet Stern lines are sent away.

 

 

Updated: October 12, 2007

 

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