Hungarian energy company MOL Group has completed reconstruction of the AV3 atmospheric distillation unit at its Danube refinery, according to reports. The unit suffered significant structural and equipment damage in a fire in October 2025, and the reconstruction is reported to have cost approximately 18 billion forints (about US$57 million).
MOL said the reconstruction work included the installation of 27 new high-capacity pumps and the replacement of 8 kilometers of piping and 100 kilometers of electrical cabling. The work also involved demolishing and rebuilding damaged concrete structures, along with restoring associated equipment, control systems and electrical infrastructure, it is reported. Construction was completed on September 22, after which the unit will undergo system flushing, pressure testing and functional testing of safety controls before crude oil is introduced in stages, according to reports.
The reconstruction investment totaled about 18 billion forints (roughly US$57 million), with 27 new high-capacity pumps installed and 8 kilometers of piping and 100 kilometers of electrical cabling replaced. Construction was completed on September 22, and phased normal operation, including crude oil introduction, is expected to proceed gradually from October, it is reported.
The completion marks the normalization, roughly a year after the fire, of a core refining unit that had been offline since the incident.
The relatively short roughly one-year timeline for completing large-scale reconstruction following a refinery fire suggests careful advance planning around spare parts procurement and workforce allocation, alongside parallel process management, according to observers. Since the atmospheric distillation unit sits at the most upstream stage of the refining process, its prolonged shutdown can affect utilization rates across downstream units, making this completion an important milestone for normalizing overall utilization at the Danube refinery. Some in the industry also note that the case underscores the importance of fire risk management and rapid recovery capability at refining facilities. The multiple safety checks, including flushing and pressure testing, required before crude introduction reflect a cautious approach to ensuring stable restart. As fire and accident risk at aging refining facilities has repeatedly been raised as an issue across Europe in recent years, MOL’s relatively swift recovery could serve as a reference case for other European refiners’ equipment investment and safety management standards. Since the Danube refinery is regarded as one of the major refining hubs in Central and Eastern Europe, this normalization is also expected to have a positive effect on regional petroleum product supply.
Whether the phased crude introduction and transition to normal operation planned for October proceeds smoothly as scheduled is the primary point to watch. How long it takes for the AV3 unit’s actual utilization and stability to return to prior levels after the restart is also worth monitoring. Whether this fire prompts MOL to expand additional safety inspections or capital investment across its other refining facilities is another point of interest. How the Danube refinery’s full normalization affects the petroleum product supply picture in Central and Eastern Europe is also a point to watch.