Examen basic of water suply

Allowable operating pressure.

Design pressure.

Operating pressure.

Service pressure.

Hydraulic hammer (water hammer).

Distribution main.

Feeder main.

Transmission main.

Network storage.

Distribution network.

Nominal diameter (DN).

Inner diameter.

Outer diameter.

Cover height.

Equivalent length.

Peak flow factor.

Name the components of the water supply system presented in the drawing below:

Give at least 4 examples of situations where stagnation of water in pipes may occur.

What designed period is appropriate for a water supply system?. 25 years. 35 years. 50 years. 60 years.

Which regulations determine requirements regarding water for fire protection?.

Which elements of a water supply system are particularly important for the system's safety?.

Explain the parameters of the Daecy-Weisbach formula: (H,λ,L,v^2,D^2 y g).

Name at least 3 factors that affect the determination of appropriate flow velocity in pipes.

Which situations may result in the hydraulic hammer?.

The trench should be prepared so that all the pipelines are located: below sanitary sewers. below freezing depth. at least 1.2 m below ground. above ground water level.

What is the minimum horizontal distance between water pipes and other underground installations: under normal conditions: ≥ 1.5 m. in case of dense infrastructure: ≥ 0.4 m. under normal conditions: ≥ 0.4 m. in case of dense infrastructure: ≥1.5 m.

When is disinfection of water pipelines required?. After construction of new pipelines. After repair or replacement works. After contamination or flooding. Before commissioning a pipeline into service. When hydrants are unavailable or insufficient.

What is the desired flow velocity in a water supply system?. > 0.3 m/s. 0.5–2.0 m/s. 1.0 m/s. < 3.5 m/s.

What can be proposed diameter of distribution main supplying a population of: 30 people: DN 50 mm. 100 people: DN 80 mm. 250 people: DN 100 mm. 30 people: DN 60 mm. 100 people: DN 180 mm. 250 people: DN 110mm.

Name water supply system configurations presented on drawings below:

Name water supply system configurations presented on drawings below:

Name water supply system configurations presented on drawings below:

Give at least two benefits of a looped water supply system. Higher reliability of water supply (alternative flow paths). More uniform pressure distribution. Reduced water stagnation. Easier isolation of damaged sections without service interruption. Sudden changes in flow velocity.

Name at least three agents that can be used as disinfectants in a water supply system. Chlorine. Chlorine dioxide. Ozone. Sodium hypochlorite. Calcium hypochlorite. Ultraviolet (UV) radiation.