Heat exchanger with telescoping expansion joint
View Patent ↗A heat exchanger comprises a shell comprising a hollow shell body and separate shell end members attached thereto. A number of tubes is disposed within the shell body which is sized to permit both ends of the tubes to project outwardly therefrom to facilitate access for attaching the tubes ends to respective tube header plates, after which time the shell end members are slid over the shell body towards the shell body ends for attachment to respective header plates. The heat exchanger can include an expansion element attached between a shell end member and the shell body, wherein the expansion element is positioned adjacent a slidable joint formed by an overlapping section of the shell body and shell end member. Together, the expansion element accommodates axial movement and the slidable joint carries vibration loads between the shell body and shell end member.
1. A method for making a shell and tube heat exchanger comprising a plurality of tubes disposed within a shell, the method comprising the steps of:
placing a number of tubes within a body of the shell, wherein the body has an axial length sized to permit opposed ends of the tubes to project outwardly a distance from opposed shell body ends, the shell including a pair of shell end members slidably disposed along an outside surface of the shell body away of the shell body ends to provide access to the tube ends;
fixedly attaching tube header plates to the opposed tube ends;
moving the shell end members along the shell body towards the tube header plates;
fixedly attaching the shell end members to respective tube header plates and attaching the shell end members to the shell body;
before the step of attaching the shell end members to the body, attaching an expansion element that is positioned around the shell body, wherein the expansion element is attached at one end to an end of one of the shell end members opposite the respective tube header plate, and is attached an opposite end to a surface of the shell body, and wherein the expansion element facilitates expansion movement between the shell body and respective shell end member.
2. The method as recited in claim 1 wherein before the step of attaching the expansion element, the end of the shell end member to be attached thereto overlaps a desired section of the shell body to provide a desired degree of load carrying therebetween, and wherein the shell end member that is attached to the expansion element is not directly fixedly attached to the shell body.
3. The method as recited in claim 1 wherein the shell body section is disposed within the shell end member a distance in the range of from about 10 to 40 millimeters.