Sweden — Vessel Pipe Renewal (cupronickel to PE-lined)
Client /A Swedish ship-repair partner
Location /Sweden (survey & installation), Shenzhen (manufacture)
Date /2025 (international delivery completed during the vessel's port call)
Sweden · cupronickel to PE-lined carbon-steel pipe conversion
Project Background
A Swedish ship-repair partner took on an international pipe-renewal project for a vessel whose seawater lines were cupronickel. The owner decided to use the drydocking to convert the whole system to more cost-effective PE-lined carbon-steel pipe. The conversion meant redesigning the interface from adjustable lap-joint flanges to a fixed-flange system, demanding very high manufacturing accuracy.
Challenges & Requirements
The material conversion brought three layers of complexity:
Different thermal expansion & wall thickness
Cupronickel and carbon-steel pipe differ in thermal expansion, wall thickness and jointing, so the interface redesign required precise engineering conversion.
Tight fixed-flange tolerances
The fixed-flange system imposed very tight geometric tolerances on the spools — any deviation would stop the faces sealing.
One standard across continents
With teams in Sweden and China working across continents, quality standards had to be perfectly aligned so that any miscommunication did not become an on-site failure.
Core goal: ensure 100% interface fit through the material conversion, achieving first-time installation from cross-continent remote prefabrication
The Irwin Solution
The Swedish partner surveyed the vessel at berth with Automet FAB and sent the data to Irwin's Shenzhen factory. Irwin's engineers turned the raw data into manufacturing isometrics, with particular engineering review and tolerance calculation for the flange-conversion interface. After fabrication, the spools underwent post-weld Automet verification, pressure testing and electrical-isolation checks, with a full quality dossier shipped alongside. The finished pipe travelled by international freight to Sweden, where the local partner installed it.
Process
Results
Every spool's flange face aligned, with no misalignment and no leaks
Well below local Nordic fabrication, saving the client a substantial budget
The Swedish partner has actively brought Irwin into other Nordic ship-repair projects
Cross-continent remote prefabrication from a digital model proved entirely viable
✅ 100% fit — flange interfaces with zero leaks and no on-site adjustment.
✅ Cost advantage — a substantial budget saving versus local Nordic fabrication.
✅ Trusted quality — the Swedish partner now recommends Irwin as the prefabrication supplier for its Nordic ship-repair projects.
✅ Model validated — cross-continent digital collaboration becomes a repeatable international template.
Client Value
The success of this project lay not only in the quality and cost of a single delivery but in proving a repeatable model of international collaboration. The Swedish partner saw that, by working digitally with Irwin, they could focus locally on client relationships and field service in the Nordics while handing the precision manufacture of complex pipe to Irwin's cost-advantaged, expert China factory. That model laid a foundation of trust for long-term collaboration across the wider European ship-repair market.