BV Series – Vertical External Pumps

Hydrodynamic sealing uses an expeller mounted on the shaft that, as it rotates, generates centrifugal pressure that prevents the fluid from escaping upwards along the shaft. When the pump is stopped, no liquid is in contact with the seal area. The result: zero leakage during operation, with no mechanical seal to maintain or replace periodically. It is the preferred solution for fluids where the mechanical seal would be the weak point of the equipment.

The BT is designed to be submerged in relatively deep wells, pits or sumps (up to 5.2 m) with a cantilever shaft. The external BV is installed on the cover of an outdoor tank, with the suction column inside the vessel and the motor on the outside. The BV handles greater flow rates (up to 1,200 m³/h) and is typically used in chemical tank farms with short suction piping and no need for a pumping pit.

It means the BV can operate during intervals without liquid in the suction column — for example, when the tank empties or the level drops below the suction bell — with no damage to bearings or the sealing system. This robustness prevents the catastrophic failures common in conventional pumps when accidentally run dry due to oversight or level fluctuation.

The column is engineered to the customer’s tank dimensions. Standard configurations cover up to several metres, and for longer columns the design is reinforced with guides and auxiliary plastic bearings. TECNIUM sizes the column in each case according to the tank, fluid and flow rate, ensuring mechanical stability and minimum vibration.

Yes. The BV Series is available in ATEX-certified versions according to Directive 2014/34/EU, with antistatic plastics where applicable, seal monitoring and proper earthing. This is the standard configuration in solvent tank farms, oxidising-acid storage and outdoor zones classified as 1, 2, 21 or 22.

No. Without a mechanical seal, the most common cause of scheduled maintenance and unplanned shutdowns of process pumps disappears. Maintenance is reduced to checking upper bearings, motor alignment and column condition. For 24/7 continuous service, this translates into a significantly lower operating cost across the equipment’s service life.