US 5,786,054 A · Inductive welding of thermoplastic pipe

Abstract

Forming a novel double containment polymeric piping assembly by interfitting slidably interfittable polymeric inner pipe components, including a first induction responsive layer therebetween, and slidably interfittable polymeric outer pipe components, preferably including a second induction responsive layer therebetween, to form an inner connection and an outer connection, while causing the inner connection to be axially offset from the outer connection, applying an electrical induction force around the periphery of the outer pipe components, axially aligned with the inner connection but not with said outer connection, and thereby fusing the inner pipe components and the first polymeric layer together, and moving the components relative to said electrical induction force, axially away from the inner connection, and axially aligned with the outer connection, applying an inductive force around the periphery of the outer pipe components, and thereby fusing the outer pipe components and the second polymeric layer together.

Claims11

Dependent claims

A method of bonding joints of a double containment polymeric piping assembly comprising:

providing slidably interfittable polymeric inner pipe components, including a first induction responsive polymeric layer therebetween;
providing slidably interfittable polymeric outer pipe components, including a second induction responsive polymeric layer therebetween;
interfitting said inner pipe components in a sliding fit with each other to form an inner connection, and said outer pipe components in a sliding fit with each other to form an outer connection, while causing said inner connection to be axially offset from said outer connection;
applying an electrical induction force around the periphery of said outer pipe components, axially aligned with said inner connection and offset from said outer connection, and thereby bonding said inner pipe components and said first polymeric layer together;
moving said components relative to said force, axially offset from said inner connection, and axially aligned with said outer connection, applying an electrical induction force around the periphery of said outer pipe components and thereby fusing said outer pipe components and said second polymeric layer together.

2 more elements

Dependencies are inferred from the claim text.

Inductive welding of thermoplastic pipe

Life of this patent

Inductive welding of thermoplastic pipe

Life of this patent

Abstract

Claims11