During 2021, TETRA Bitola successfully engineered and completed one of its most complex technical projects: the full construction and hydrotechnical equipping of dewatering pumping stations to control surface and groundwater inflow at the Brod-Gneotino and Suvodol mines, part of the REK BITOLA energy complex. This capital project encompassed the procurement, delivery, expert installation, and successful commissioning of high-capacity submersible pumps in series with centrifugal pumps, integrated with receivers, GRE pipelines, electrical power systems, and advanced automation.

The overall scope of work resulted in the commissioning of three complex pumping stations. At the Brod-Gneotino mine, two sets consisting of TSURUMI Japan submersible pumps ($Q=100\text{ l/s}$, $H=40\text{ m}$, $P=75\text{ kW}$) mounted on special floating pontoons were installed, connected in series with BBA PUMPS Netherlands centrifugal pumps ($Q=100\text{ l/s}$, $H=95\text{ m}$, $P=160\text{ kW}$). These are linked via DN250 PN16 GRE pipelines from Dutch manufacturer FPI-Netherlands, spanning a total length of 3,500 meters. For the Suvodol mine, one identical set was installed, equipped with a more powerful BBA PUMPS centrifugal pump ($P=400\text{ kW}$, $H=160\text{ m}$) and a 1,800-meter GRE pipeline.

The complete system was commissioned along with substations and electrical control panels equipped with variable frequency drives (VFDs), control automation, and protective systems. With this project, TETRA once again proved its capacity to solve the largest industrial engineering challenges in the country.