High pressure pipe and fitting restraint system

Abstract

A restraint system for use in securing temporary flow lines that include multiple pipe sections, each pair of pipe sections connected together with a fitting or coupling such as a hammer joint coupling. The system includes multiple pluralities of endless loop slings connected end to end with a cow hitch or girth hitch knot. Disconnectable fittings (e.g., shackles) are placed every three or more slings so that easy disassembly is afforded in case of leakage or other failure.

Claims

1. A restraint system for use in securing temporary flowlines that include multiple pipe sections, each pair of sections connected together with one or more fittings, the system comprising: a) an assembly of multiple endless loop slings connected end-to-end, each said sling having first and second sling end portions, said sling end portion secured to one or more of said other slings with a knotted connection; b) a plurality of disconnectable fittings that each join one assembly of multiple slings to another assembly of multiple slings; c) wherein the disconnectable fitting is not a said sling; d) the slings attached to the assembly of pipe sections and fittings with knots at spaced apart positions; and e) each knot formed by a portion of a said sling that encircles the temporary flowline at a position in between said first and second sling end portions.

2. The restraint system of claim 1 wherein the disconnectable fitting is a shackle.

3. The restraint system of claim 1 wherein the knot includes at least one 360 wrap of a said sling around a said pipe section.

4. The restraint system of claim 1 wherein each sling assembly includes multiple endless loop slings.

5. The restraint system of claim 1 wherein the said knot secures each endless loop sling assembly to the pipe section encircling the pipe next to a said fitting.

6. The restraint system of claim 4 wherein each sling assembly includes a sling that connects to two other said slings with first and second spaced apart cow hitch knots.

7. The restraint system of claim 1 wherein there are multiple spaced apart fittings and the assembly of endless loop slings encircles a pipe section multiple times in between two of said spaced apart fittings.

8. The restraint system of claim 1 wherein the assembly of endless loop slings encircles a said fitting multiple times and on opposing sides of said fitting.

9. The restraint system of claim 1 wherein the slings are of differing lengths.

10. The restraint system of claim 1 wherein the slings are of differing thicknesses.

11. A method for restraining a temporary flow line that includes multiple pipe sections, each pair of sections connected together with a disconnectable coupling to form a pipe assembly, comprising the steps of: a) providing first and second sling assemblies, each assembly comprising multiple endless sling loops connected to one another, each said sling having first and second sling ends; b) each sling assembly including at least three endless loop slings connected end to end, one of the endless loop slings being a middle sling that connects at spaced apart positions to the other said slings; c) the endless loop slings connected end to end connecting each plurality to another plurality with a disconnectable connector; d) the slings attached to the assembly of pipe sections and fittings with knots; and e) wherein each knot is formed by a portion of a said sling in between said first and second sling ends that encircles the flow line.

12. The method of claim 11 wherein the disconnectable connector is not a part of an endless sling.

13. The method of claim 11 wherein the connector is metallic.

14. The method of claim 11 wherein the connector is a shackle.

15. The method of claim 11 wherein the connector is a fitting having two parts, one part that disconnects from the other part.

16. A method for restraining a temporary flow line that includes multiple pipe sections, each pair of sections connected together with a disconnectable coupling, comprising the steps of: a) providing multiple connected endless loop slings, each endless loop sling having first and second sling ends; b) one or more of the endless loop slings connecting to another said sling with a disconnectable connector; c) knotting the slings to the flow line at intervals with spaced apart knots; and d) wherein each knot is formed by a portion of a said sling in between said first and second sling ends that encircles the flowline.

17. The method of claim 16 wherein the disconnectable connector is not a part of an endless sling.

18. The method of claim 16 wherein the connector is metallic.

19. The method of claim 16 wherein the connector is a shackle.

20. The method of claim 16 wherein the connector is a fitting having two parts, one part that disconnects from the other part.

21. The method of claim 16 wherein the slings are of differing lengths.

22. The method of claim 16 wherein the slings are of differing diameters.

23. The method of claim 16 wherein the slings are of a polyester material.

24. The method of claim 16 wherein the slings are of a synthetic fiber material.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

(1) For a further understanding of the nature, objects, and advantages of the present invention, reference should be had to the following detailed description, read in conjunction with the following drawings, wherein like reference numerals denote like elements and wherein:

(2) FIG. 1 is a perspective view of a preferred embodiment of the apparatus of the present invention illustrating one of the loop sling portions thereof;

(3) FIG. 2 is an elevation view illustrating a part of the method of the present invention;

(4) FIG. 3 is an elevation view illustrating a part of the method of the present invention;

(5) FIG. 4 is an elevation view illustrating a part of the method of the present invention;

(6) FIG. 5 is a fragmentary view illustrating a connection used to join one endless loop sling to another endless loop sling as part of the method of the present invention;

(7) FIG. 6 is an fragmentary view illustrating a part of the method of the present invention;

(8) FIG. 7 is an elevation view illustrating a part of the method of the present invention;

(9) FIG. 8 is an elevation view illustrating a part of the method of the present invention;

(10) FIG. 9 is a fragmentary elevation view illustrating a connection of one loop sling to another loop sling using a shackle;

(11) FIG. 10 is a fragmentary elevation view illustrating a connection of one loop sling to another loop sling using a shackle;

(12) FIG. 11 is a fragmentary elevation view illustrating a connection of one loop sling to another loop sling using a shackle;

(13) FIG. 12 is a fragmentary elevation view illustrating a connection of one loop sling to another loop sling using a shackle;

(14) FIG. 13 is a fragmentary elevation view illustrating a connection of one loop sling to another loop sling using a shackle;

(15) FIG. 14 is a partial perspective view illustrating the method of the present invention, illustrating an anchor at one end portion of a sling assembly;

(16) FIG. 15 is a partial perspective view illustrating the method of the present invention, illustrating an anchor at one end portion thereof; and

(17) FIG. 16 is a partial view of a preferred embodiment of the apparatus of the present invention illustrating a sling assembly as used with the method of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

(18) FIGS. 1-16 show a preferred embodiment of the apparatus of the present invention designated generally by the numeral 10 in FIGS. 2-4. Restraint system 10 is used to secure a high pressure flow line or pipeline 11 that can be comprised of a plurality of pipe sections 12, 13 and fittings 14 (e.g., couplings, valves, elbows, tees or other fittings).

(19) Two (2) pipe sections 12, 13 are usually connected at fitting 14. However, the term fitting as used herein should be construed broadly to include anything that can be part of a piping system or flowline. Fitting as used herein includes but is not limited to an elbow, tee, reducer, valve, coupling, hammer union, union, as examples. In such a high pressure flow line 11, multiple pipe sections are typically connected end to end with fittings, unions or couplings. The flow line 11 can include multiple straight sections 12, 13 of pipe and elbow or bend sections, tee fittings, couplings, unions, and the like. Such temporary high pressure flow lines, fittings and pipe joints are well known in the art.

(20) A fitting 14 (e.g., a coupling such as a hammer union 14, which is commercially available) can be used to join a pair of pipe sections 12, 13 together (see FIGS. 2 and 8). Such hammer unions, couplings or like fittings 14 are known in the art and commercially available. Coupling or fitting 14 can provide a hammer nut 15 having projections 16 which can be pounded with a hammer to insure a tight seal for the connection of coupling or fitting 14 when it is used to join two pipe sections 12, 13 together. An example of a hammer union and seal arrangement can be seen in U.S. Pat. No. 6,764,109 entitled Hammer Union and Seal Therefor. U.S. Pat. No. 6,764,109 is hereby incorporated herein by reference.

(21) In FIGS. 5-6, there can be seen a knotted connection, such as a cow hitch or girth hitch knot 18 that joins one endless loop sling 17A to another endless loop sling 17B and to a third sling 17C (see FIG. 16). The slings 17 can be connected end to end as seen in FIG. 16 to form a sling assembly 29 (e.g., two or three or four slings). Each sling 17 has ends 31, 32 and center 33. Every few slings, the connection is with a shackle 23 or other disconnectable connector. The knot 18 of FIGS. 5-6 and 16 can be perfected to connect two slings 17A, 17B together by forming a first loop 20 and passing it through a second loop 21 as indicated by arrow 19 and pulling the first loop 20 through the second loop 21 until knot 18 is formed as indicated by arrow 22. The assembled slings 17A, 17B connected with knot 18 can be seen in FIGS. 5-6 and 16.

(22) Once two or more slings 17 are connected end to end as seen in FIGS. 7 and 16, an assembly of such slings 17 (e.g., three slings 17A, 17B, 17C connected end-to-end) is connected to another assembly of slings (e.g., three slings 17A, 17B, 17C connected end-to-end) with a disconnectable connector such as a shackle 23. Shackle 23 has two separable parts, bow 24 and pin 25. Such shackles are commercially available. In this fashion, if a leak is detected, only two shackles 23 next to or on opposing sides of the leak need be disconnected as opposed to all of the slings 17. This feature enables the disassembly of only a few slings instead of the dozens or even hundreds of slings that might be employed to restrain a high pressure pipeline or piping system.

(23) The assemblies of slings 17A, 17B, 17C (e.g., three slings per assembly) are knotted to the pipe 11 and fittings 14 at selected intervals using half hitch or other knots (see FIGS. 2-4 and 7-16). In FIG. 2, an anchor 27 is provided that can be part of an immovable object such as wellhead 26. In order to install the restraint system 10 of the present invention on a high pressure flow line 11, pipeline or piping system, one end portion of a sling assembly 29 is attached to anchor 27 of wellhead 26. FIGS. 2 and 3 illustrate such an attachment. A half hitch or cow hitch knot 18 can be used to attach an assembly of slings 17A, 17B, 17C as shown in FIG. 16 to the anchor 27 shown in FIGS. 2 and 3. End 31 is looped through the center of end 32 as illustrated by arrows 30 in FIG. 2. The knotted connection to anchor 27 is designated by the numeral 34 in FIG. 3.

(24) Once an assembly of slings 17A, 17B, 17C is connected to anchor 27 at connection 34, arrows 38 illustrate that the assembly 29 of slings is connected to the high pressure flow line 11 at intervals. At each connection to the pipeline 11, a knot can be used such as a hitch or half hitch knot 35. In FIG. 3, two half hitch or hitch knots 35 are used, one on each side of fitting 14 which fitting is an elbow in FIG. 3. For a length of pipe or section of pipe 12 or 13, half hitch or hitch knots 36 can be used at intervals (e.g., every five (5) feet (1.524 meters)) designated by the numeral 28 in FIG. 3. In FIG. 3, two more hitches or half hitch knots 37 are used on opposing sides of a fitting 14 which is a hammer union.

(25) In FIGS. 4 and 7-9, the installation of an assembly 29 of endless loop slings 17A, 17B, 17C can be seen. Assembly 29 attaches to piping system 11 wherein knots 35, 36 and 37 having been completed. Once a first sling assembly 29 of for example two or three or more slings is affixed to the piping system 11 as shown in FIGS. 3 and 4, one sling assembly 29 of a plurality of slings 17 is then attached to another sling assembly 29 of a plurality of slings 17 using shackles as shown in FIG. 16. In this fashion, only one or two shackles 23 need be disconnected should a leak occur. User's could then repair the damaged pipe section 11 or 12 or the damaged fitting 14 and then attach a sling assembly or assemblies 29 with shackles 23.

(26) FIGS. 10-13 show an alternate method of attaching one loop sling 17A to another loop sling 17B using shackle 23. In FIGS. 10-13, a first loop sling 17A is connected to a second loop sling 17B by routing the first loop sling 17A through the open center 33 of the second loop sling 17B as illustrated by arrow 39 in FIG. 10. An end 31 of the loop sling 17A is then fastened to the sling 17A using shackle 23 as shown in FIGS. 11-13.

(27) FIGS. 14 and 15 show an alternate anchoring arrangement wherein the anchor 41 connects to the piping system or pipe line 11 at connection 42. In FIGS. 14 and 15, fitting 14 such as a hammer union is closely spaced to connection 42. A sling assembly 29 or sling 17 is connected to the pipe line 11 on opposing sides of the fitting or hammer union 14 with a shackle 23 connecting one portion of the sling 17 or sling assembly 29 to another portion of the sling or sling assembly 17, 29 in order to perfect an attachment of the sling assembly 29 to the pipe line 11 itself for providing an anchor at one end portion of the sling assembly 29. The sling assembly is attached to the piping system or pipe line 11 using hitch knots or half hitch knots 35, 36, 37 as with the embodiment of FIG. 4.

(28) The following is a list of parts and materials suitable for use in the present invention:

(29) TABLE-US-00001 PARTS LIST: PART NUMBER DESCRIPTION 10 restraint system 11 high pressure flow line/pipe line 12 pipe section 13 pipe section 14 coupling/hammer union/fitting/elbow/tee 15 hammer nut 16 projection 17 endless loop sling 17A first loop sling 17B second loop sling 17C third loop sling 18 cow hitch knot/girth hitch knot/sling hitch knot/knotted connection 19 arrow 20 first loop 21 second loop 22 arrow 23 shackle/disconnectable connector 24 bow 25 pin 26 wellhead 27 anchor 28 distance 29 sling assembly 30 arrow 31 loop end portion 32 loop end portion 33 open center 34 connection to anchor 35 hitch or half hitch knot 36 hitch or half hitch knot 37 hitch or half hitch knot 38 arrow 39 arrow 41 anchor 42 connection

(30) All measurements disclosed herein are at standard temperature and pressure, at sea level on Earth, unless indicated otherwise. All materials used or intended to be used in a human being are biocompatible, unless indicated otherwise.

(31) The foregoing embodiments are presented by way of example only; the scope of the present invention is to be limited only by the following claims.