Swivel seal assembly and alignment method

An alignment assembly for a swivel seal assembly having a non-rotating upper nut, having a sleeve and a carrier assembly and a stationary seal assembly connected with the carrier assembly, a rotating lower nut having a rotating seal assembly mounted on the rotating lower nut, wherein the rotating seal assembly comprises a rotating seal retainer and a rotating seal ring having an annular protrusion on a sealing surface of the stationary seal ring, wherein the stationary seal ring sealing surface and the rotating seal ring sealing surface face one another, and wherein the rotating seal ring annular protrusion and the stationary seal ring annular protrusion are concentrically aligned with and directly engage one another in a sealing relationship when the rotating seal assembly and stationary seal assembly are concentrically aligned with one another, the alignment assembly comprising:

• a first alignment fixture having a flange and an alignment cylinder extending from the flange and wherein the first alignment fixture alignment cylinder is provided with an outside diameter;
• a second alignment fixture having a flange and an alignment cylinder, wherein the second alignment fixture flange is configured for mounting to the rotating lower nut, wherein the second alignment fixture alignment cylinder is provided with an inside diameter greater than the outside diameter of the first alignment fixture alignment cylinder;
• wherein the first alignment fixture alignment cylinder is configured to be inserted into the second alignment fixture alignment cylinder in a sliding fit;
• an adapter flange having a planar base and an annular flange extending from the planar base, wherein the first alignment fixture flange is configured for mounting to the planar base and wherein the planar base includes at least one locating fixture extending from the planar base parallel to the annular flange of the adapter flange, wherein the adapter flange is concentrically aligned with the rotating lower nut and the rotating seal assembly when the first alignment cylinder is inserted into the second alignment cylinder;
• wherein the non-rotating upper nut comprises an alignment pilot configured to accept the locating fixture of the adapter flange to position the non-rotating upper nut into concentric alignment with the adapter flange, the adapter flange being further configured for mounting to the sleeve and carrier assembly in concentric alignment;
• wherein the stationary seal assembly comprises a stationary seal retainer and a stationary seal ring having an annular protrusion on a sealing surface of the stationary seal ring;
• wherein the rotating seal assembly comprises a rotating seal retainer and a rotating seal ring having an annular protrusion on a sealing surface of the stationary seal ring;
• wherein the stationary seal ring sealing surface and the rotating seal ring sealing surface face one another, and wherein the rotating seal ring annular protrusion and the stationary seal ring annular protrusion are concentrically aligned with and directly engage one another in a sealing relationship when the rotating seal assembly and stationary seal assembly are concentrically aligned with one another;
• a stationary seal pilot ring mounted on and concentrically aligned with the carrier assembly and configured to contain the stationary seal assembly within the stationary seal pilot ring in concentric alignment with the carrier assembly;
• and
• a rotating seal pilot ring mounted on and concentrically aligned with the rotating lower nut and configured to contain the rotating seal assembly within the rotating seal pilot ring in concentric alignment with the rotating lower nut.

A method of aligning a swivel seal assembly having a non-rotating upper nut, having a sleeve and a carrier assembly and a stationary seal assembly connected with the carrier assembly, a rotating lower nut having a rotating seal assembly mounted on the rotating lower nut, wherein the rotating seal assembly comprises a rotating seal retainer and a rotating seal ring having an annular protrusion on a sealing surface of the stationary seal ring and having an inside diameter and an outside diameter, wherein the stationary seal ring sealing surface and the rotating seal ring sealing surface face one another, and wherein the inside diameter and outside diameter of the rotating seal ring annular protrusion are approximately the same as the insider diameter and outside diameter of the stationary seal ring annular protrusion such that the rotating seal ring annular protrusion and the stationary seal ring annular protrusion are concentrically aligned with and directly engage one another in a sealing relationship when the rotating seal assembly and stationary seal assembly are concentrically aligned with one another, the method comprising:

• assembling the non-rotating upper nut and rotating lower nut;
• mounting an adapter flange to a flange of a top alignment fixture;
• mounting a bottom alignment fixture to the lower nut;
• inserting an alignment cylinder of the top alignment fixture into an alignment cylinder of the bottom alignment fixture and collapsing the top and bottom alignment fixtures together;
• raise the top alignment fixture and adapter flange and align a locating fixture of the adapter flange with an alignment pilot of the non-rotating upper nut to align the non-rotating upper nut with the adapter flange;
• secure the upper nut to the adapter flange;
• remove the top and bottom alignment fixtures;
• and
• fasten the adapter flange to the sleeve, carrier assembly, and stationary seal assembly.