Source: supplied project archive. The intervention and outcomes below are reported for this project. Supporting records can be discussed with Euras.
The challenge
Emergency Leak Threatening Operational Safety
At the PAP Lisina facility—part of the HE Vrla hydropower system in southern Serbia—active water ingress was detected in the valve chamber and adjacent tunnel areas. The leaks were considered critical due to:
- Proximity to pressure regulation systems,
- Presence of aging concrete and prior patch repairs,
- Continued water exposure accelerating deterioration,
- Difficulty accessing the internal cavities where water was entering.
This presented a risk of structural weakening, service interruption, and escalating repair costs if not addressed immediately.
The solution
EURAS® Gel Type B for Deep Penetration and Active Displacement
EURAS® Gel Type B was chosen as the most viable option due to its:
- Ability to be injected directly into water-bearing cracks and porous concrete,
- Performance in active leak conditions without drying or sealing off the area,
- Elastic, expanding properties that allow it to flow into inaccessible voids,
- Long-term chemical and thermal stability (-25°C to +100°C),
- Full resistance to groundwater acidity and aggressive particles.
This made it ideal for a fast, high-impact intervention in one of the plant's most critical zones.
Execution methodology
The specialist team conducted:
- Targeted drilling to access water ingress zones without dismantling infrastructure,
- High-pressure injection of EURAS Gel into cracks, fissures, and joints—up to 150 bar pressure,
- Monitoring of flow reduction and gel expansion to confirm proper filling and saturation,
- Post-injection testing to verify long-term waterproofing and adhesion under load.
Despite the complexity and urgency, the intervention was completed within a 48-hour window.