Flange assembly

An assembly comprising:

• a metallic equipment flange that comprises an axially extending bore wall, a seal recess disposed at a radial distance from the axially extending bore wall, and a radially extending surface between the axially extending bore wall and the seal recess;
• a metallic pipe flange that comprises an axially extending bore wall, a seal recess disposed at a radial distance from the axially extending bore wall, and a radially extending surface between the axially extending bore wall and the seal recess;
• a metallic joint component seated in part in each of the seal recesses to form a primary seal and to create an axial gap between the radially extending surfaces with a gap dimension;
• a disk-shaped joint component seated radially inwardly from the metallic joint component, wherein the disk-shaped joint component comprises axially extending lips at an inner perimeter that contact the radially extending surfaces to form a secondary seal therebetween, and wherein the disk-shaped joint component comprises a disk portion that extends radially outwardly from the axially extending lips with a disk portion axial dimension that is less than an axial dimension of the axially extending lips and less than the gap dimension;
• and
• a protective fluid disposed between the disk-shaped joint component and the radially extending surface of at least one of the metallic equipment flange or the metallic pipe flange.