Electrical connection system suitable for providing cathodic protection underwater
An electro-mechanical connection is of the type of a “hot stab” connection. The connection also includes a jagged surface in the form of a scraper, which is capable of cutting through a deposit that could otherwise excessively increase the electrical resistance across the connection. The connection can be used underwater and installed by a diver or ROV, for example, for connecting cathodic protection to a subsea structure.
1. A connection system, comprising:
a first connector assembly, the first connector assembly including a first conductive body capable of being connected to a cable, the first conductive body having a jagged surface, the first connector assembly comprising a first threaded portion; and
a second connector assembly, the second connector assembly including a second conductive body capable of being connected to subsea equipment, the second conductive body having a contact surface, the second connector assembly comprising a second threaded portion;
wherein, upon connection of the first connector assembly with the second connector assembly, the first threaded portion engages the second threaded portion and the jagged surface of the first conductive body engages and scrapes the contact surface of the second conductive body,
whereby an electrically conductive pathway is created between the first conductive body of the first connector assembly and the second conductive body of the second connector assembly.
2. The connection system of claim 1 ,
the first connector assembly having a first guide surface; and
the second connector assembly further having a second guide surface,
wherein, upon connection of the first connector assembly with the second connector assembly, the first guide surface engages and slides against the second guide surface.
3. The connection system of claim 2 ,
wherein directions of the first guide surface and an envelope of the jagged surface are oblique, and
wherein directions of the second guide surface and the contact surface are parallel.
4. The connection system of claim 3 ,
wherein the first guide surface comprises at least a portion of a first cylindrical surface;
wherein the envelope of the jagged surface comprises a portion of a cylindrical surface, which is inclined relative to the first cylindrical surface;
wherein the second guide surface comprises a portion of a second cylindrical surface; and
wherein the contact surface comprises another portion of the second cylindrical surface.
5. The connection system of claim 1 wherein the first conductive body includes an aperture and a scraper mounted in the aperture, wherein the jagged surface is disposed on the scraper, and wherein the jagged surface protrudes from the aperture.
6. The connection system of claim 5 wherein the scraper is mounted in the aperture using a compliant element.
7. The connection system of claim 6 wherein the compliant element includes a spring pin.
8. The connection system of claim 1 wherein the jagged surface comprises at least one tooth.
9. The connection system of claim 8 wherein the contact surface is essentially smooth.
10. The connection system of claim 8 wherein the jagged surface is formed by a plurality of teeth.
11. The connection system of claim 10 wherein each of the plurality of teeth includes a wedge-shaped ridge.
12. The connection system of claim 1 wherein the first connector assembly comprises a shaft rotatable inside a bore of the first conductive body, wherein the first threaded portion is disposed around the rotatable shaft, wherein the second connector assembly comprises a hole, and wherein the second threaded portion is disposed inside the hole.
13. A method of using a connection system, comprising:
connecting a cable to a first connector assembly, the first connector assembly including a first conductive body configured to be connected to the cable, the first conductive body having a jagged surface, the first connector assembly including a first threaded portion; and
connecting subsea equipment to a second connector assembly, the second connector assembly including a second conductive body configured to be connected to the subsea equipment, the second conductive housing having a contact surface, the second connector assembly including a second threaded portion;
connecting the first connector assembly with the second connector assembly;
engaging the first threaded portion with the second threaded portion;
causing the jagged surface of the first conductive body to engage and scrape the contact surface of the second conductive body upon connection of the first connector assembly with the second connector assembly; and
creating an electrically conductive pathway between the cable and the subsea equipment.
14. The method of claim 13 , further comprising cutting through a deposit on the contact surface with the jagged surface.
15. The method of claim 13 , further comprising causing a first guide surface of the first connector assembly to engage and slide against a second guide surface of the second connector assembly upon the connection of the first connector assembly with the second connector assembly.
16. The method of claim 13 , further comprising deflecting a compliant element, wherein the first conductive body includes an aperture and a scraper mounted in the aperture, wherein the jagged surface is disposed on the scraper, wherein the jagged surface protrudes from the aperture, wherein the scraper is mounted in the aperture using the compliant element.
17. The method of claim 13 , further comprising maintaining a potential of the subsea equipment via the cable for providing cathodic protection to the subsea equipment.
18. The method of claim 13 , wherein the electrically conductive pathway between the cable and the subsea equipment is created in absence of seals between the first connector assembly and the second connector assembly.