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Field Modification of DCU Support Skirt-to-Vessel Attachment Weld Geometry

Presented By

Pedro Amador - AZZ WSI


Courtesy of AZZ WSICracking in the weld area of the support skirt to vessel connection is common in DCU vessels. Typically, the welded connection between the support skirt and the vessel incorporates geometry features to reduce the magnitude of stress levels caused by process thermal cycling. Some designs incorporate a tangential skirt to vessel geometry that does not offer any stress reducing features.

A refinery owner was experiencing significant cracking at the skirt to vessel attachment weld location. In addition to compromising the skirt to vessel attachment, the cracking was growing into the vessel pressure boundary. A field implemented process was developed to repair the cracking damage of the vessel pressure boundary and provide a modified attachment geometry to significantly reduce the stress levels at the skirt to vessel attachment location.

The repair was implemented utilizing two automated welding processes that eliminated the need for post weld stress relief at the repair locations.

Pedro Amador, AZZ WSI - presenter at RefComm Budapest 2017As AZZ WSI’s VP & Chief Technology Officer, Pedro has been involved in the development and implementation of a variety of industry repair processes that provide energy customers with cost and schedule saving alternatives to conventional repair techniques. Pedro has developed machine welding automation and field robotic repair vs. replace processes that are commonly used in the power generation as well as refining and petrochemical industries. In his current position, Pedro leads an engineering team focused on delivering materials and high temperature corrosion expertise complemented with automated tooling systems for the mitigation of integrity issues faced by our customers.

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