Power-generation ductwork that dry-fit on the first attempt, and a 100-foot wastewater trough held straighter than spec.
Each case study covers the requirement, how Northern built it, and the outcome the customer measured.
Power generation facility needed large-diameter stainless exhaust ductwork to mate to existing in-plant flanges during a scheduled outage, with zero tolerance for forced alignment on site.
Regional wastewater authority needed a 100-foot 304L stainless trough to replace a failed unit during a planned outage. Straightness was specified within 1/8 inch over the full 100-foot length. The previous fabricator couldn't hold tolerance over the span.
A pollution-control OEM needed a large WESP (wet electrostatic precipitator) built in AL-6XN: a multi-story collecting structure, roughly 17 feet tall, with collector rows stacked one above the next. Each row had to hold straight within 1/8 inch, and the tolerance stacked from the bottom up.
A 67-foot, 100-ton 304L stainless steel monocoque with 72 unique multi-ton panels, sharp corners that ruled out press brake forming, and no two faces parallel. As designed, the structure was considered unbuildable.
Every joint passed radiography against the piping-package acceptance criteria, with the welder and procedure stamped on each weld map.
A process-piping program needed full-penetration butt welds that would pass radiography on every joint, in a high-chromium austenitic stainless that punishes inconsistent prep. The variable that defeats full penetration on pipe is fit-up.
Send the drawing. Our engineers review the spec before we quote it.
