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Publication numberUS3597779 A
Publication typeGrant
Publication dateAug 10, 1971
Filing dateNov 5, 1969
Priority dateNov 5, 1969
Publication numberUS 3597779 A, US 3597779A, US-A-3597779, US3597779 A, US3597779A
InventorsMorgan George W
Original AssigneeNorth American Rockwell
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Multiconduit buoyed underwater line
US 3597779 A
Abstract  available in
Images(2)
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Claims  available in
Description  (OCR text may contain errors)

United States Patent [72] Inventor George W. Morgan Anaheim, Calif. [21 I Appl. No 874,163 [22] Filed Nov. 5, 1969 [45] Patented Aug. 10, I971 [73] Assignee North American Rockwell Corporation (54] MULTICONDUIT BUOYED UNDERWATER LINE 11 Claims, 4 Drawing Figs. [52] US. Cl 9/8 R, 174/ 101.5 [51] Int. Cl 02g 9/12 [50] Field of Search 9/8 R;

[56] References Cited UNITED STATES PATENTS 311,149 1/1885 Stevens 138/113 3/1920 Dray 138/103 3,332,093 7/1967 Skinner et al. 9/8 3,425,453 10/1965 Fuller 138/111 3,489,182 1/1970 Cameron... 9/8 3,517,110 6/1970 Morgan 9/8 Primary Examiner-Milton Buchler Assistant Examiner-Gregory W. OConnor Attorneys-L. Lee Humphries, Charles F. Dischler and Dominick Nardelli ABSTRACT: A flexible underwater line has a plurality of conduits layed in a helical configuration about a central core member. The central core member in turn has a group of spokes, extending radially therefrom and each group is disposed at spaced intervals along its length. The conduits are layed between the spokes so that the spokes protrude above the conduits and a ring-buoy is clamped about each group of spokes so that the spokes prevent the buoys from moving axially along the central core member.

Patented Aug. 10, 1971 3,597,779

2 Sheets-Sheet 1 INVENTOR. GEORGE W. MORGAN A T TORNE Y Patented Aug. 10, 1971 v 3,597,779

2 Sheets-Sheet 2 FIG 4 INVENTOR. GEORGE W. MORGAN A TTORNE' Y MULTICONDUIT BUOYEI) UNDERWATER LINE This invention relates to underwater lines and more particularly to flexible lines which may. for example, function as risers.

In my U.S. Pat. application, Ser. No. 72l,0l4 filed on Aug. l2, I968, now US. Pat. No. 3,526,086 and assigned to the same assignee as this patent application there is disclosed an underwater line wherein a plurality of conduits are layed in a helical configuration around a central core member which is capable of withstanding a relatively high tensile load. Therefore, when the underwater line is used as a riser, the top end of this core member is tied to a buoy to support all weight of the riser. This arrangement produces relatively large stresses in the core member near the buoy, especially in very long risers. Of course the stress decreases linerally with depth. Therefore, the core member is understressed at the lower end making inefficient use of the available material.

Therefore, an object of this invention is to produce a riser wherein efficient use of the material is made.

Another object of this invention is to provide means in a riser to periodically support the weight thereof to prevent the development of relatively large stresses.

These and other objects and features of advantages of the present invention will become more apparent from reading the following detailed description in conjunction with the accompanying drawings, in which:

FIG. 1 shows a portion of the complete riser incorporating the features of this invention;

FIG. 2 shows the central core member before wrapped with conduits and filler material;

FIG. 3 shows the riser with various items removed to show the novel features thereof; and

FIG. 4 is a section of the riser taken at one of the buoys, and at line 4-4.

Referring to the drawings and to FIGS. 2 and 3 in particular, there is shown the preferred embodiment of the novel riser which includes a core member preferably in the form of a metallic pipe or tube 11. Helically wound around the tube are a plurality of conduits or metallic tubes 12, for example, eight. Between the tubes 11 and 12 (FIG. 4) is disposed filler material, for example, plastic threads 13 and 14 of various diameters so that substantially all the spacing between the tubes is filled and the tubes are prevented from rubbing against each other whenever the riser flexes due to sea currents. A suitable cover, for example a plastic sheet 17, is placed around the tubes 12 and plastic threads 13 and I4 and secured by suitable means. In addition buoys 21 are axially spaced along the riser to provide a slight amount of positive buoyancy to the riser. Since the buoys have positive buoyancy and tend to rise and since the tubes II and 12 have negative buoyancy and tend to sink, one feature of this invention is to provide means for transferring the shear forces therebetween.

As shown in FIG. 2, the shear force transferring means includes spoke groups spaced axially along the core member I1. Each group contains spokes 26 that are arranged evenly around a circle to extend radially. The spokes 26 can be, for example, spot welded to the core member 11 for structural strength. In addition the spokes in one group are preferably aligned with the respective spokes on each of the other groups. The conduits I2 lie in the sector formed by two spokes 26 as shown in FIG. 4. Since the conduits 12 are helically wound around the core member I], each conduit 12 advances preferably one sector in a clockwise direction as it winds around the core member as shown in FIG. 3. The plastic threads 13 and 14 preferably twist in the same manner that the conduits twist. Since the groups 25 are axially spaced along the riser, the plastic sheet 17 preferably extends from one group 25 to the next one. The sheet 17 can be fastened in place by, for example, stitches 18. As seen in FIG. 3 the spokes 26 have a length so that they protrude beyond the plastic sheet 17. The buoys 21, which are toroidal in shape, are made into two similar sections with a semicircular channel-shaped metallic stitTner 31 disposed on the inner curved edge thereof. Suitable buoyant material 32 is molded onto the stiffners 31. Therefore when both buoy sections are bolted in place as shown in FIG. 4 the ends of the spokes are disposed within the channel-shaped stiffners 31 thereby preventing the buoys 21 from moving axially along the risers.

With the present disclosure in view, modifications thereof would appear to those skilled in the art. Accordingly, the invention is not limited to the illustrated embodiment but includes all such modifications and variations within the scope of the invention as defined in the appended claims.

What I claim is:

I. A riser comprising:

a core member adapted for extending substantially vertically in the ocean,

a plurality of conduits layed along side said core member,

means for bundling said conduits and core member together,

a plurality of spokes extending from said core member and through said bundling means, and

at least one buoy fixed to said riser and engaging at least one of said spokes so that said buoy is prevented from moving along said riser.

2. The riser of claim I wherein:

said spokes are disposed in at least one group and lying in a circle around said core member, and

said buoy is toroidal in shape and made of two similar sections,

both of said sections are clamped around said risers and engage all the spokes in one of said groups.

3. The riser ofclaim 2 wherein:

said groups are spaced along said riser and said conduits lie in the sectors formed by two spokes.

4. The riser of claim 1 wherein:

said conduits are helically wound around said core member,

and

filler material is placed between said conduits and core member to prevent rubbing therebetween when said riser flexes.

5. The riser ofclaim 1 wherein:

said buoy has a channel-shaped stiffener disposed at the inner curved periphery of each of said sections, and

the ends of said spokes are disposed within said channelshaped stiffener when said buoy is clamped to said riser.

6. The riser of claim 2 wherein:

said conduits are helically wound around said core member,

and

filler material is placed between said conduits and core member to prevent rubbing therebetween when said riser flexes.

7. The riser of claim 3 wherein:

said conduits are helically wound around said core member,

and

filler material is placed between said conduits and core member to prevent rubbing therebetween when said riser flexes.

8. The riser of claim 3 wherein:

said buoy has a channel-shaped stiffener disposed at the inner curved periphery of each of said sections, and

the ends of said spokes are disposed within said channelshaped stiffener when said buoy is clamped to said riser.

9. The riser of claim 4 wherein said buoy has a channel-shaped stiffener disposed at the inner curved periphery of each of said sections, and

the ends of said spokes are disposed within said channelshaped stiffener when said buoy is clamped to said riser.

10. The riser ofclaim 6 wherein.

said buoy has a channel-shaped stiffener disposed at the inner curved periphery of each of said sections, and

the ends of said spokes are disposed within said channelshaped stiffener when said buoy is clamped to said riser.

11. The riser of claim 7 wherein said buoy has a channelshaped stiffener disposed at the inner curved periphery of each of said sections, and 75 the ends Ffsaid spokes are disposed wifliihiaid cha hnel shaped stiffener when said buoy is clamped to said riser.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US311149 *Mar 12, 1884Jan 20, 1885 Chimney for dwelling-houses
US1332384 *Aug 1, 1919Mar 2, 1920Michael DrayShip-raising apparatus
US3332093 *May 25, 1965Jul 25, 1967Hewitt Robins IncFloat for submarine hose system
US3425453 *Oct 21, 1965Feb 4, 1969Fuller ForneyOcean pipeline system
US3489182 *Mar 23, 1967Jan 13, 1970Uniroyal LtdLiquid conveying hose with float
US3517110 *Apr 1, 1968Jun 23, 1970North American RockwellFlexible underwater riser containing electrical conductors and material conduits
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4086561 *Jun 17, 1976Apr 25, 1978Wooddy Jr Douglas WilliamMarine seismograph cable balancing
US4188679 *Oct 31, 1977Feb 19, 1980Phoeniz AgAnnular shaped buoyancy element for transport hoses
US4320590 *Nov 26, 1979Mar 23, 1982Holekamp Malcolm LDredging device
US4506622 *Nov 22, 1983Mar 26, 1985Samson Ocean Systems, Inc.Hawser line flotation
US5197912 *Aug 29, 1991Mar 30, 1993Lengefeld Ralf MBuoy for attachment to the net line of a fishing net
US5330378 *Aug 21, 1992Jul 19, 1994Park David EFloat for ropes
US5520270 *Apr 3, 1995May 28, 1996Daimler-Benz Aerospace AgTank structure for holding liquid especially in a spacecraft
US6239363 *Apr 6, 1999May 29, 2001Marine Innovations, L.L.C.Variable buoyancy cable
US6331129 *Aug 16, 2000Dec 18, 2001William L. EarleyDevice for marking swimming pool lane dividers
US7713104 *Oct 10, 2005May 11, 2010Acergy France, S.A.Apparatus and method for connection and disconnection of a marine riser
US7771245 *Nov 24, 2006Aug 10, 2010Technip FranceAssembly of buoys for flexible submarine pipe
US8152581 *Aug 31, 2007Apr 10, 2012The Yokohama Rubber Co., Ltd.Floater for marine hose
US8485855 *Jul 29, 2010Jul 16, 2013Daniel R. VogelApparatus for restoring buoyancy to a buoy
US20080214072 *Oct 10, 2005Sep 4, 2008Stolt Offshore SaApparatus And Method For Connection And Disconnection Of A Marine Riser
US20080274656 *Nov 24, 2006Nov 6, 2008Sylvain RouteauAssembly of Buoys for Flexible Submarine Pipe
US20090036008 *Jul 11, 2008Feb 5, 2009Lou WatkinsStreamlined annular buoy for marine pipelines
US20100108825 *Oct 13, 2009May 6, 2010Brock Robert DFoam support for line pipe
US20100216360 *Aug 31, 2007Aug 26, 2010The Yokohama Rubber Co., Ltd.Floater for marine hose
Classifications
U.S. Classification441/133, 174/70.00R, 174/101.5
International ClassificationH01B7/12
Cooperative ClassificationH01B7/12
European ClassificationH01B7/12