Patent ID: 6626467
Filing Date: 2003-09-30
Classification: F16L

Abstract:
A double containment pipe connection comprising:an inner primary pipe and an outer secondary pipe with a fluid passage between the pipes, wherein an end portion of the secondary pipe has a reduced outer diameter forming an annular lip; a fitting including an inner tube and an outer tube with a fluid passage between the tubes; an intermediate diameter portion adjacent to the end of the outer tube of the fitting having a diameter intermediate between the inside diameter and the outside diameter of the outer tube, the intermediate diameter portion comprising a cylindrical surface; a sealing reducer comprising: a smaller diameter end having an inside diameter sufficiently larger than the outside diameter of the outer secondary pipe to slide over the outside of the outer secondary pipe, and a larger diameter end having an inside diameter sufficiently larger than the outside diameter of the inner tube to permit fluid flow therebetween; a first seal between the smaller diameter end of the reducer and the outside of the outer secondary pipe; a second seal between the larger diameter end of the reducer and the intermediate diameter portion of outer tube of the fitting, the second seal comprising an adhesive cement between the outside of the outer secondary pipe and the inside of the smaller diameter end of the reducer; and a split ring positioned around the annular lip of the secondary pipe and adhered to the secondary pipe with an adhesive cement, wherein the split ring has a thickness approximately equal to difference between the outside diameter of the annular lip and outside diameter of the secondary pipe adjacent the annular lip, and wherein the second seal comprises an adhesive cement between the outside of the split ring and the inside of the smaller diameter end of the reducer.