Pipe coupling assembly and method for lined and unlined pipe

1. A coupling assembly comprising:

a first pipe comprising a threaded portion and a non-threaded portion, the non-threaded portion located at a free end of the first pipe;

a second pipe comprising a threaded portion and a non-threaded portion, the non-threaded portion located at a free end of the second pipe;

a coupling member fixedly connecting the first pipe and the second pipe, the coupling member comprising a first threaded inlet for receiving the first pipe, a second threaded inlet for receiving the second pipe and a non-threaded portion extending between the first inlet and the second inlet, the non-threaded portion of the coupling member including an annular recess, a cross-section of the coupling member defining the annular recess comprising:

a vertical leg;

a first angled leg extending from the vertical leg;

a horizontal leg extending from the first angled leg;

a second angled leg extending from the horizontal leg; and

a third angled leg extending from the second angled leg to the first threaded inlet of the coupling member, the first angled leg and the horizontal leg defining a beveled portion of the non-threaded portion of the coupling member and the second angled leg and the third angled leg defining an undercut recess, the undercut recess configured to receive the non-threaded portion at the free end of the first pipe, and

a lining system comprising:

a ring member positioned at the free end of the first pipe, the ring member comprising a body member having a first end and a second end, the first end having a flange extending therefrom;

a liner disposed in the first pipe, the liner having an end configured to cooperate with the first end of the ring member; and

a corrosion barrier ring disposed between and cooperating with the second end of the ring member and the beveled portion of the non-threaded portion of the coupling member, the corrosion barrier ring comprising opposing indented ends comprised of beveled portions configured to cooperate with a beveled portion of the second end of the ring member and the beveled portion of the non-threaded portion of the coupling member.

2. The coupling assembly of claim 1 , wherein the cross-section defining the annular recess further comprises:

an additional horizontal leg extending from the vertical leg to a center of the non-threaded portion;

a sloping leg extending from the additional horizontal leg;

a fourth angled leg extending from the sloping leg; and

a fifth angled leg extending from the fourth angled leg to the second threaded inlet of the coupling member.

3. The coupling assembly of claim 2 , wherein the fourth angled leg and the fifth angled leg define an additional undercut recess.

4. The coupling assembly of claim 3 , wherein the additional undercut recess is configured to receive the non-threaded portion at the free end of the second pipe.

5. The coupling assembly of claim 2 , wherein the sloping leg extends from the fourth angled leg to the additional horizontal leg at an angle of about 5°.

6. The coupling assembly of claim 1 , wherein the beveled portions of the corrosion barrier ring, the second end of the ring member and the non-threaded portion of the coupling member are beveled at about a 45° angle.

7. The coupling assembly of claim 1 , wherein the corrosion barrier ring is made of a resilient elastomeric material.

8. A coupling assembly comprising:

a pipe comprising a threaded portion and a non-threaded portion, the non- threaded portion located at a free end of the pipe;

a box accessory comprising a coupling member for fixedly connecting the pipe to the box accessory, the coupling member comprising a threaded inlet for receiving the pipe and a non-threaded portion extending from the threaded inlet, the non-threaded portion of the coupling member including an annular recess, a cross-section of the coupling member defining the annular recess comprising:

a vertical leg;

a first angled leg extending from the vertical leg;

a horizontal leg extending from the first angled leg;

a second angled leg extending from the horizontal leg;

and a third angled leg extending from the second angled leg to the threaded inlet of the coupling member, the first angled leg and the horizontal leg defining a beveled portion of the non-threaded portion of the coupling member and the second angled leg and the third angled leg defining an undercut recess, the undercut recess configured to receive the non-threaded portion at the free end of the first pipe, and

a lining system comprising:

a ring member positioned at the free end of the pipe, the ring member comprising a body member having a first end and a second end, the first end having a flange extending therefrom;

a liner disposed in the pipe, the liner having an end configured to cooperate with the first end of the ring member; and

a corrosion barrier ring disposed between and cooperating with the second end of the ring member and the beveled portion of the non-threaded portion of the coupling member, the corrosion barrier ring comprising opposing indented ends comprised of beveled portions configured to cooperate with a beveled portion of the second end of the ring member and the beveled portion of the non-threaded portion of the coupling member.

9. The coupling assembly of claim 8 , wherein the box accessory is one of a valve and a pump.

10. The coupling assembly of claim 8 , wherein the beveled portions of the corrosion barrier ring, the second end of the ring member and the non-threaded portion of the coupling member are beveled at about a 45° angle.

11. The coupling assembly of claim 8 , wherein the coupling member is made of steel.

12. The coupling assembly of claim 8 , wherein the ring member is made of glass-reinforced epoxy.

13. The coupling assembly of claim 8 , wherein the corrosion barrier ring is made of a resilient elastomeric material.