Grid coupling seal and method
A system and method for replacing a sealing arrangement of a grid coupling without removing or disturbing a mechanical connection of the coupling with driver and driven shafts connected to the coupling includes providing combined seal members having gasket seal portions that are integrally formed with radial seal portions and that are disposed between portions of the housing and the rotating seal group of the grid coupling.
1. A method for replacing seals in a grid coupling, comprising:
providing a grid coupling in an assembled position between two rotating machine components;
while a rotating group of the grid coupling remains connected between the rotating machine components:
removing a housing from around the rotating group of the grid coupling;
removing existing seals of the grid coupling disposed between the rotating group and the housing;
inserting two seal elements around the rotating group, each of the two seal elements including a gasket portion and two radial seal portions;
assembling the housing around the rotating group and the two seal elements such that the two radial seal portions are disposed in sliding and sealing relation between the housing and the rotating group and the gasket portion creates a mechanical face seal between flanges of two halves of the housing; and
securing the two halves of the housing together to form the housing.
2. The method of claim 1 , further comprising providing a second gasket portion in each of the two seal elements, the second gasket portion creating a mechanical face seal between the flanges.
3. The method of claim 1 , further comprising inserting each of the two radial seal portions into a corresponding channel formed around at least a portion of an opening of the housing that surrounds a cylindrical bearing surface of the rotating group.
4. The method of claim 1 , further comprising compressing a thicker cross section of the gasket portion along an inner end of the housing and a thinner cross section of the gasket portion along an outer end of the housing.
5. The method of claim 1 , wherein each gasket portion is flat and includes first and second axial ends and wherein each radial seal portion has a U-shape connected at one end to the first or second axial ends of a respective gasket portion, wherein the two radial seal portions extend in parallel to one another.
6. The method of claim 1 , wherein each gasket portion sealably engages the flanges of one of the two housing halves, and each radial seal portion has a semicircular shape, and wherein each of the two seal elements is formed as an integral structure from an elastomeric material.
7. The method of claim 1 , wherein each radial seal portion has a cross sectional shape that is flat on an outer periphery and convex on an inner periphery thereof.