Double containment pipe joint assembly

• US 5,141,261 A
• Filed: 04/04/1991
• Issued: 08/25/1992
• Est. Priority Date: 04/04/1991
• Status: Expired due to Term

• Current Assignee: Christopher G. Ziu
• Original Assignee: Double Containment Systems, Inc.
• Inventors: Ziu, Christopher G.
• Primary Examiner(s): Nicholson, Eric K.
• Application Number:
  US07/681,331
• Time in Patent Office: 509 Days
• Field of Search: 285/47, 285/138, 285/133.1
• US Class Current: 285/123.1
• CPC Class Codes: F16L 39/005 for concentric pipes

Abstract

A double containment pipe joint assembly is provided with an inner pipe and an outer or containment pipe secured in concentric relation. The pipe joint assembly includes a fitting having end surfaces on concentric flanges which can be secured to a length of a primary and containment pipe at intervals along the pipeline wherein sections of the pipeline can be removed and repaired without the necessity of removing the whole pipeline. The concentric flanges are joined by a thickened divider ring which provides smooth fillets at its juncture with the flanges to reduce thermal stresses on the fitting.

Claims

1. A double containment pipe joint assembly comprising:

a pipe fitting having

tubular body provided with an inner annular flange provided with a bore therethrough adapted to be joined along at least one end surface to a first pipe,

an outer annular flange connected by a ring encircling said tubular body to said tubular body having an end face adapted to be secured to a second or containment pipe,

said ring having a thickness greater than the thickness of said inner or outer annular flange,

said outer annular flange being concentrically mounted about and spaced from the tubular body portion of said fitting, and

said ring being formed as one piece and having on one end a first substantially conical end surface in cross-section between said outer flange and tubular body portion, and having on the other end a second substantially conical end surface in cross-section between said outer flange and tubular body portion, said second conical end surface being tapered in a substantially opposite direction relative to said first conical end surface,

said outer annular flange and said tubular body being joined to said ring by a smooth fillet throughout the length of a juncture for reducing thermal stresses on said fitting.

2. A double containment pipe joint assembly in accordance with claim 1 wherein said pipe fitting is formed from one-piece of solid material.

3. A double containment pipe joint assembly comprising:

a pipe fitting having

a generally tubular body provided with an inner annular flange including an aperture formed therethrough and adapted to be joined to a first pipe,

an outer annular flange connected by a ring encircling said tubular body and said tubular body having a surface adapted to be secured to a second or containment pipe, said outer annular flange being made of a different material in comparison to the material of said tubular body,

said ring being formed as one piece and having a thickness greater than the thickness of said inner or outer annular flange, said ring defining on one end a substantially conical-tapered end surface and defining on the other end another substantially conical-tapered end surface tapered in substantially the opposite direction in comparison to the other end surface,

said outer annular flange being concentrically mounted about and spaced from the tubular body portion of said fitting, and

said outer annular flange and said tubular body each being joined to said ring by smooth fillets throughout the length of a juncture for reducing thermal stresses on said fitting.

4. A double containment pipe joint assembly comprising:

a pipe fitting having

a generally tubular body provided with an inner annular flange defining an aperture extending therethrough and adapted to be joined along a surface thereof to a first pipe,

an outer annular flange connected by a ring encircling said tubular body to said tubular body having a surface adapted to be secured to a second or containment pipe,

said ring being formed as one piece and having a thickness greater than the thickness of said inner or outer annular flange, said ring including on one end a substantially conical end surface located between said outer annular flange and said tubular body, and including on the other end another substantially conical end surface located between said outer annular flange and said tubular body, said conical end surfaces being tapered in substantially opposite directions relative to each other,

said outer annular flange being concentrically mounted about and spaced from the tubular body portion of said fitting,

said outer annular flange and said tubular body each being joined to said ring by smooth fillets throughout the length of a juncture for reducing thermal stresses on said fitting.

5. A double containment pipe joint assembly comprising:

an inner tubular body provided with an aperture extending therethrough,

an outer tubular body connected by a ring encircling said inner tubular body to said inner tubular body,

said ring having a thickness greater than the thickness of said inner or outer tubular bodies,

said outer tubular body being concentrically mounted about and spaced from said inner tubular body by said ring,

said ring being formed as one piece and having a first substantially conical-tapered end surface in cross-section located between said outer tubular body and said inner tubular body, and a second substantially conical-tapered end surface in cross-section located between said outer tubular body and said inner tubular body on an opposite end of said ring relative to said first conical-tapered end surface, said first and second end surfaces being tapered in substantially opposite directions relative to each other.

6. A double containment pipe joint assembly as defined in claim 5, wherein said inner tubular body includes an inner flange for joining along at least one end surface of said inner flange to a first pipe.

7. A double containment pipe joint assembly as defined in claim 5, wherein said outer tubular body includes an outer flange for joining along at least one end surface of said outer flange to a second pipe.