Replacing the top 15 feet of the ISO ALT-06 ISO stripper at Imperial’s Strathcona Refinery was a job an entire year in the making. Melloy Industrial supplied two staff members — a planner/scheduler and a superintended (a full-time Melloy employee) —to Imperial to plan for the job in Autumn 2014 with the turnaround slated for the following September.

This planning phase allowed us to devise methods for the complicated technical work to follow. To complete the water jet cut on the head and capture the nearly five tons of sand used in the cutting process, Melloy built a scaffold and bulk head to prevent the need for a massive clean up in the bottom portion of the tower. The job also required an alternate welding procedure that would not require a post-weld heat treatment, which we developed a procedure for, and in order to reduce the time required for welding inspection, we utilized phased-array ultrasonic testing (PAUT).

This particular vessel was located inside the refinery’s alkylation unit, which uses hydrofluoric acid as a catalyst. This specialized scope of work required all staff working in the unit to wear full alkylation protective “B” suits. With over 50,000 labor hours in these conditions, Melloy did not experience a single recordable incident on the project.

Constructed by