# US 2019/0315438 A1 · Self-restoring motion compensating mooring system

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2019/0315438 A1
- Document ID: US20190315438A1
- Status: Published application
- Kind: A1
- Application number: 16/381,122
- Filed: 2019-04-11
- Published: 2019-10-17
- Earliest claimed: 2018-04-11
- Assignees: Jitendra Prasad; William C Hu; Manoj Menon
- Inventors: Jitendra Prasad; William C Hu; Manoj Menon; Ramakrishnan Hari Prasad; Suresh Kumar Moyyeti
- Web page: https://patentgrep.com/patent/US20190315438A1

## CPC

- B63B 39/06: to decrease vessel movements by using foils acting on ambient water (constructional aspects of bilge keels B63B3/44 {; foils mounted on the housing of outboard motors B63H20/34})
- B63B 21/20: Adaptations of chains, ropes, hawsers, or the like, or of parts thereof
- B63B 39/02: to decrease vessel movements by displacement of masses
- B63B 21/10: Fairleads
- B63B 21/16: using winches (winches per se B66D)
- B63B 21/50: Anchoring arrangements {or methods} for special vessels, e.g. for floating drilling platforms or dredgers
- B63B 2021/206: {Weights attached to mooring lines or chains, or the like; Arrangements thereof}
- B63B: SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING (arrangements of vessel ventilation, heating, cooling, or air-conditioning B63J2/00; floating substructures as supports of dredgers or soil-shifting machines E02F9/06)

## Abstract

There is provided a self-restoring motion compensating mooring system for a floating unit. The mooring system includes a plurality of mooring anchors, a plurality of top fairleads attached near the top edges of the floating unit, a plurality of bottom fairleads attached near bottom edges of the floating unit, a stabilizer, a plurality of mooring cables passing through the respective top and bottom fairleads, connected between the plurality of mooring anchors and the stabilizer. Further, in respective equilibrium positions of the floating unit and the stabilizer, the center of gravity of the stabilizer is located directly below the center of gravity of the floating unit.

## Claims

### Claim 1

A self-restoring motion compensating mooring system for a floating unit, the mooring system comprising:
a floating unit;
a plurality of mooring anchors;
a plurality of top fairleads attached near the top edges of the floating unit;
a plurality of bottom fairleads attached near bottom edges of the floating unit;
a stabilizer located below the floating unit configured to lower the center of gravity of the entire system leading to greater stability;
a plurality of mooring cables passing through the respective top fairleads and the respective bottom fairleads, connected between the plurality of mooring anchors and the stabilizer;
wherein the center of gravity of the stabilizer is located directly below the center of gravity of the floating unit in the respective equilibrium positions of the floating unit and the stabilizer;
wherein external forces acting upon the floating unit and/or stabilizer, causes the stabilizer to move in the direction of the applied force relative to the position of the stabilizer under the floating unit thereby creating tension on the plurality of mooring cables;
wherein the tension created by the displacement of the stabilizer acts in the opposite direction to offset the applied force and brings the floating unit and the stabilizer back to the respective neutral equilibrium positions.

### Claim 2 (depends on 1)

The mooring system a claimed in claim 1, wherein the floating unit is selected from a structure, platform, vessel or rig that is deployed in water of any depth.

### Claim 3 (depends on 1)

The mooring system a claimed in claim 1, wherein the external forces include forces applied by the wind, current, waves and/or tides.

### Claim 4 (depends on 1)

The mooring system a claimed in claim 1, wherein each of the plurality of mooring cables passes through two or more top fairleads and/or bottom fairleads of the plurality of top fairleads and the plurality of bottom fairleads, for motion compensation and/or for avoiding interference by a structure of the floating unit.

### Claim 5 (depends on 1)

The mooring system a claimed in claim 1, wherein the plurality of top fairleads and the plurality of bottom fairleads are mounted on a plurality of hinges and/or pivots to allow the plurality of top fairleads and the plurality of bottom fairleads to swing side to side and/or to rotate.

### Claim 6 (depends on 1)

The mooring system a claimed in claim 1, wherein the plurality of mooring lines pass through respective tension sensors to provide signals to curtail, to suspend or to shutdown floating unit operation in case of abnormally high or low cable tension.

### Claim 7 (depends on 1)

The mooring system a claimed in claim 1, wherein the plurality of mooring cables are connected with a plurality of respective wear cables, thereby making the plurality of wear cables connect with the stabilizer, through the plurality of fairleads attached on to the floating unit.

### Claim 8 (depends on 1)

The mooring system a claimed in claim 1, wherein the plurality of top fairleads are selected from a group comprising winches, pulleys and a combination thereof.

### Claim 9 (depends on 8)

The mooring system a claimed in claim 8, wherein the combination of winches and pulleys are wound manually and/or with a motor driven by electric, hydraulic or pneumatic power.