CN2799519Y - Light tension leg self-installing type single point mooring equipment - Google Patents

Abstract

The utility model relates to a light tension leg self-installing singlepoint mooring oil transportation device, which is an improvement on a traditional CALM singlepoint mooring device. The utility model is composed of a suction force anchor, an anchor topping lift hall, a mooring buoy and a buoy top turret, wherein the mooring buoy and a benthoal anchor are connected through the anchor topping lift hall (namely a tension leg) which keeps a tension state; according to water depth conditions, the height of the tension leg is regulated so that the mooring buoy is positioned underwater forever; an oil transportation hose passes through the inside of a central post of the turret; the top end of the turret is provided with an oil transportation rotating joint; the bottom of the turret is provided with a mooring rope rotating ring. The device has the advantage that the shorter a tension rope is, the bigger provided mooring force is, and thus, the utility model is suitable for shallow water; a buoy top turret post with a small diameter has the function of protecting the oil transportation hose, and thus, the utility model adapts to sea areas with ice; the suction force anchor can be basically self-installed so that construction cost and installation cost are both low.

Description

A kind of light-duty tension leg self-mounting type single point mooring (SPM) fuel delivery device

Affiliated technical field

The utility model belongs to marine oil tanker single buoy mooring system field, is the improvement to traditional C ALM system.

Background technology

Marine so far oil tanker single point mooring unit is existing multiple, relatively Chang Yong a kind of CALM system that is called, i.e. catenary anchor cable mooring system.The CALM system is made up of seabed anchor (or stake), catenary anchor cable, mooring buoy and tube top turntable.Be characterized in being provided by the catenary anchor cable mooring capacity of mooring buoy, the single long weight of catenary anchor cable is big more, and Suo Changyue is big, and the horizontal displacement of floating drum is big more, and then the horizontal restoring force of floating drum is big more, and the mooring force that provides is big more.Therefore, the CALM system is well suited for than the territory, deep-sea; Its oil line passes surface buoy and guides oil tanker through swivel joint into flotation hose in addition, and this feature makes it only to be suitable for not have the ice marine site.At shallow water the ice marine site is arranged, the CALM system is little being fit to, and other system also has similar problem.We can say and also do not have a kind of economic and practical single point mooring's fuel delivery device that shallow water has the ice marine site that is well suited for so far.

Summary of the invention

Be not suitable for the defective that shallow water has the ice marine site to use in order to overcome existing CALM system, the utility model provides a kind of light-duty tension leg self-mounting type single point mooring (SPM) fuel delivery device on the basis of improving the CALM system, this single point mooring's fuel delivery device is fit to shallow water, ice marine site (as China Bohai Sea) use is arranged.

The technical scheme that its technical matters that solves the utility model adopts is: light-duty tension leg self-mounting type single point mooring (SPM) fuel delivery device, form by seabed anchor, anchor top lift, mooring buoy and a tube top capstan head.It is characterized in that being connected by the anchor top lift (being tension leg) that keeps tension state between said mooring buoy and the seabed anchor,, mooring buoy is positioned under water forever according to the height of depth condition adjustment of tonicity leg.The capstan head center mast is inner, and the oil transportation swivel joint is arranged at the capstan head top by oil hose, and the capstan head root has the mooring fast change.The content of the technical program embodies a concentrated reflection of in the improvement to traditional C ALM system.

One of improve is that mooring buoy with the CALM system is moved under water by the water surface, change the catenary anchor cable into the tension force anchor cable, thereby the floating drum to same volume obtains maximum constant buoyancy, the anchor cable pretension of corresponding acquisition maximum and acquisition corresponding horizontal restoring force under the varying level displacement.Its know-why can be expressed by following all formulas:

If spar diameter is D, highly be H, the float buoyancy coefficient is C _W, the tension cord radical is n, and Suo Changdu is L, and the floating drum horizontal displacement is δ x, then has

Float buoyancy $B=C_w\·\frac{\mathrm{\π}}{4}{D}^{2}H$ (as get C _w≈ 0.5)

Tension cord pretension T _o=B/n

The horizontal restoring force of floating drum $F_x=B\frac{{\mathrm{\δ}}_x}{\sqrt{L^2-{{\mathrm{\δ}}_x}^2}}\≈B\frac{{\mathrm{\δ}}_x}{L}=C_w\frac{{\mathrm{\πD}}^{2}H}{4L}{\mathrm{\δ}}_x$

Big more by the visible floating drum of following formula, buoyancy is big more, and the tension cord pretension is also big more; Tension cord length is short more, and the floating drum horizontal displacement is big more, and then horizontal restoring force is big more, and horizontal restoring force is the root that obtains mooring force.As seen this system preceence that (long L is little for tension cord) uses in the shoal water zone.

Two of improvement is in change of level district ice action just district, this system only with a thinner column or the conical surface in order to the protection internal oil pipe and make the application force minimum of ice.Add the oil pipe swivel joint is located at column top more than the highest water level, the heaving pile rotating disk is located at the following column root of lowest water level, thereby makes it the impact avoiding icing, so this system also can adapt to the marine site, ice formation.

Because native system adopts the suction anchor basis, move from installing in addition so can realize moving.

The utility model beneficial effect is: 1) be suitable for shallow water, have the ice marine site to use; 2) since the tension leg anchor cable than stretched wire leg anchor cable much shorter, so structural cost is lower; 3) can realize from installing and pulling out multiplexingly, erected cost is lower.

Description of drawings

Be described further below in conjunction with drawings and Examples.

Fig. 1 is the utility model overall structure front elevation;

Fig. 2 has novel overall structure birds-eye view for this reality;

Among the figure: (1) suction anchor basis, (2) tension cord, (3) mooring buoy, (4) tube top capstan head, (5) mooring fast change, (6) oil transportation swivel joint, (7) sea is oil pipeline down, (8) manifold, (9) oil transportation standpipe, (10) trustship arm, (11) hawse pipe.

The specific embodiment

The structure of single point mooring (SPM) of the present utility model fuel delivery device is formed and is expressed by accompanying drawing.The preparation method of each component part is as follows:

(1) suction anchor basis: comprise suction anchor tube, top cover, roll by conventional steel plate and be welded;

(2) tension cord: according to calculate the tension force type selecting purchase optional wirerope or steel chain;

(3) mooring buoy: be the plate-girder system, form by conventional steel plate and section steel manufacture;

(4) tube top capstan head: in the center mast that is fixed in the floating drum center is arranged, be with outward and upper and lower two bearings bonded assembly rotating cylinder.They all are minor-diameter steel-tube, can directly select for use;

(5) mooring fast change (tape spool holds): can choose or self manufacture;

(6) oil transportation swivel joint: can choose or make by oneself.

The utility model mooring gear as follows from erection procedure:

Wherein, suction anchor basis (1) has been made integral body and has been possessed inflation from floating haul condition, mooring buoy (3) has also been made integral body together with capstan head on the tube (4) and has been possessed from floating haul condition, but so independent transportation by driving of two parts, also can be sitting in suction anchor basis on overall from floating haul (recommend overall from floating haul) with top floating drum, to the destination anchor foundation (1) exhaust is transferred until about anchor end insertion seabed 1m, tension cord (2) is stretching gradually, after this water filling sinks down into the predetermined design elevation to floating drum (3), again anchorage (1) is implemented conventional suction sinking until whole injection seabed.At this moment, tension cord (2) should with all emptyings of floating drum (3), make and obtain maximum buoyancy subsequently near stretching, so every tension cord (2) obtains the pretension with value.So far system installs, thereby enters mode of operation, and mooring force can be provided.Now take off the columns certificate:

The local depth of water is 15m (lowest water level is following), spar diameter D=12m, height H=3m, tension cord length L=12m, rope radical=4, floating drum horizontal displacement δ _x=5m then has

Buoy mooring's power $B{=C}_w\frac{\mathrm{\π}}{4}{D}^{2}H\≈0.5\·\frac{\mathrm{\π}}{4}\·{12}^2\×3^2\≈170t$

Single rope pretension T _o=B/n=170/4 ≈ 42.5t

Horizontal restoring force $F_x=B\frac{{\mathrm{\δ}}_x}{\sqrt{L^2-{{\mathrm{\δ}}_x}^2}}=170\·\frac{5}{\sqrt{144-25}}\≈170\×0.458\≈77.9t$

This is sizable horizontal restoring force, can satisfy the requirement of sizable oil tanker mooring force.

Claims (4)

1. a light-duty tension leg self-mounting type single point mooring (SPM) fuel delivery device is made up of seabed anchor, anchor top lift, mooring buoy and a tube top capstan head; It is characterized in that being connected by the anchor top lift that keeps tension state between said mooring buoy and the seabed anchor, a top capstan head is positioned at mooring buoy center of top position.

2. according to the light-duty tension leg self-mounting type single point mooring (SPM) fuel delivery device of claim 1, it is characterized in that said seabed anchor adopts the suction anchor basis.

3. according to the light-duty tension leg self-mounting type single point mooring (SPM) fuel delivery device of claim 1, it is characterized in that inner the oil transportation swivel joint is arranged at the capstan head top by oil hose for the center mast of said tube top capstan head, the capstan head root has the mooring fast change.

4. according to the light-duty tension leg self-mounting type single point mooring (SPM) fuel delivery device of claim 1, it is characterized in that said anchor top lift can wirerope, also can be anchor chain.

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