This facility provides cold storage services to a variety of customers in it’s 4 freezer areas in this plant, which is part of its 145- facility US network. The original facility had a portion of the ammonia piping routed on the roof with some of the suction piping routed inside the freezer spaces. As the facility expanded, suction liquid and hot gas lines were added and also routed across the roof. During a routine maintenance inspection, their maintenance manager also inspected some pipe. After some investigation, Summit Refrigeration Group was called in to perform a mechanical integrity inspection on the pipe and indeed found several areas where the pipes required replacement. This customer then decided that the time was right to replace all of the piping and control valve groups to 11 freezer evaporators.