Patent ID: 7677579

Claim:
A combination of a double-walled pipe and at least one seal assembly, the double-walled pipe comprising one inner pipe and one outer pipe, the inner and outer pipes being concentrically arranged, the inner pipe being operable to transport a fluid, an annular space being defined between the inner and outer pipes, and the seal assembly comprising an annular member dimensioned to fit within the annular space, the seal assembly dividing the annular space longitudinally, the seal assembly further comprising at least one longitudinal conveying device passing through the annular member, wherein the longitudinal conveying device communicates with the annular space on either side of the seal assembly, the longitudinal conveying device being of a shorter length than the double-walled pipe, the seal assembly forming a liquid tight seal with the inner and outer pipes by deformation of portions of the annular member when the annular member is inserted to fit within the annular space, the portions of the annular member comprising an inner lip of the annular member engaging the inner pipe and an outer lip of the annular member engaging the outer pipe to form the liquid tight seal, the inner lip of the annular member being sized and shaped to extend inward beyond the inner circumference and the outer lip of the annular member being sized and shaped to extend outward beyond the outer circumference, respectively, of a body of the annular member prior to insertion of the annular member to fit within the annular space.