초록 ▼

A heated flowline electrical isolation joint is disclosed for introducing current into a pipe-in-pipe system having an outer and an inner pipe. A hub presents a load flange having tension and compression load shoulders on its terminal end and connects to the inner pipe on its other end. An end flang

A heated flowline electrical isolation joint is disclosed for introducing current into a pipe-in-pipe system having an outer and an inner pipe. A hub presents a load flange having tension and compression load shoulders on its terminal end and connects to the inner pipe on its other end. An end flange presents an end flange load shoulder on one end and a high strength, highly electrically insulative first ring separates the compression load shoulder from the end flange load shoulder which engage therethrough in a load bearing relationship. A plurality of o-ring seals secure the compression load shoulder-to-first ring-to-end flange load shoulder interfaces. A retainer flange connects to the end flange on one end and to the outer piper on the other end, encircling the hub and presenting a retainer flange load shoulder. A second high strength, highly electrically insulative ring separates the tension load shoulder of the hub from the retainer flange load shoulder which engage therethrough in a load bearing relationship. A plurality of o-ring seals securing the tension load shoulder-to-second ring-to-retainer flange load shoulder interfaces. An electrical feedthrough tubes receives an electrical penetrator which reaches through the retainer flange to electrical connection with the hub. An electrically insulative material in the annulus between the hub and the retainer flange and between the electrical penetrator and the electrical feedthrough tube secures electrical isolation across non-load bearing areas.

대표청구항 ▼

[ What is claimed is:] [1.]1. A heated flowline electrical isolation joint for introducing current into a pipe-in-pipe system having an outer and an inner pipe, the joint comprising:a hub presenting a load flange on its terminal end and connected to the inner pipe on its other end;tension and compre

[ What is claimed is:] [1.]1. A heated flowline electrical isolation joint for introducing current into a pipe-in-pipe system having an outer and an inner pipe, the joint comprising:a hub presenting a load flange on its terminal end and connected to the inner pipe on its other end;tension and compression load shoulders on the load flange;an end flange having an end flange load shoulder;a first ceramic insulating seal ring separating the compression load shoulder from the end flange load shoulder which are engaged therethrough in a load bearing relationship;a plurality of o-ring seals securing the compression load shoulder-to-first ceramic insulating seal ring-to-end flange load shoulder interfaces;a retainer flange connected to the end flange on one end and to the outer pipe on the other end, encircling the hub and presenting a retainer flange load shoulder;a second ceramic insulating seal ring separating the tension load shoulder of the hub from the retainer flange load shoulder which are engaged therethrough in a load bearing relationship;a plurality of o-ring seals securing the tension load shoulder-to-second ceramic insulating seal ring-to-retainer flange load shoulder interfaces;an electrical feedthrough tube;an electrical penetrator reaching through the electrical feedthrough tube to the inner pipe;an electrical insulating material in a first annulus between the hub and the retainer flange and a second annulus between the electrical penetrator and the electrical feedthrough tube.