Technical indicators

1. Raw Water Conduit

From the existing raw water conduit Valea Uzului Bacău, through an existing valve chamber, a new proposed conduit will be connected to transport raw water to the treatment station and storage reservoir. The conduit pipe will be made of PEHD 160 mm, SDR 17 and will have a length of 1,515 m. A 22 m canal undercrossing will be made, with a protective pipe made of OL DN200 mm.

2. Water Utility

The designed treatment station consists of a simple physical-chemical treatment installation for raw water in order to make it potable. The quality guarantee of the potable water is ensured by the processes and equipment described below:

• Industrial mechanical filter with washable stainless steel cartridges, equipped with two pressure gauges and automatic cleaning system (maximum flow 85 m³/h).
• Horizontal cylindrical reaction tank made of PAFSIN, capacity 22 m³.
• Pre-chlorination installation composed of:
  • Hypochlorite dosing pump (max 5 l/h and max pressure 15 bar).
  • Sodium hypochlorite solution storage tank (capacity 100 liters).
  • Impulse water meter DN100.
• Automatic filtration supply pumping group, consisting of two vertical electric pumps (1A+1R) with the following characteristics:
  • Q = 9 l/s, H = 44 mCA, P = 7.45 kW, n = 2850 rpm, U = 3 x 400 V, 50 Hz, automation with frequency converter per pump.
• Automatic filters with Turbidex, duplex parallel system (2 filters equipped with solenoid valves for washing process).
• Automatic activated carbon filters, duplex parallel system.
• Washing pumping group for automatic filtration installations, consisting of two vertical electric pumps (1A+1R) with the following characteristics:
  • Q = 25.8 – 39.2 m³/h, H = 46 - 41 mCA, P = 7.45 kW, n = 2850 rpm, U = 3 x 400 V, 50 Hz, automation with frequency converter per pump.
• Post-chlorination installation composed of:
  • Hypochlorite dosing pump (max 5 l/h and max pressure 15 bar).
  • PE sodium hypochlorite storage tank, capacity 100 liters.
  • Impulse water meter DN100.
• Automation panel ST.
• The treated water will be stored in a modular cylindrical reservoir made of galvanized steel panels and a 3-layer membrane of polyester fabric coated with PVC on both sides. The reservoir capacity is 502 m³ (diameter 10.3 m and height 6.35 m). It will be equipped with:
  • Interior and exterior ladder.
  • Level indicator.
  • 50 mm polystyrene wall insulation.
  • Electric heater 1 x 3 KW.
  • Roof with inspection hatch and ventilation opening.
  • Connections: supply 1 x DN150, suction distribution 1 x DN150, suction washing filters 1 x DN150, overflow 1 x DN150, bottom drain 1 x DN100.
• From the reservoir, water will be pumped into the proposed distribution network through a treated water pumping group consisting of two vertical electric pumps (1A+1R) with the following characteristics:
  • Q = 14 l/s, H = 60 mCA, P = 14.91 kW, n = 2850 rpm, U = 3 x 400 V, 50 Hz, level floats (min, max), and automation with frequency converter per pump.

3. Distribution Network

The proposed distribution network will be made of PEHD 63 - 160 mm, PE100, SDR17 and will have a total length of 24,521 m. Along its route, 78 valve chambers are proposed to be constructed. The chambers will be made of concrete and will have frames and covers made of composite material, trafficable. For undercrossing national roads, rivers, and streams over a length of 339 m, protective pipes made of OL DN200 mm will be used.