Typical sizes of clean water tanks. Water supply tanks

Reservoirs pure water(RFV) are intended for storage regulatory stock W reg , required to accumulate water when different modes work of pumping stations of the 1st and 2nd rises, fire fighting W p / p, and water supply for the own needs of the treatment plant W sob. The total volume of clean water tanks is determined by the formula:

W RFV = W reg + W pp + W sob, (m 3) (27)

The regulating volume of the RFV, like that of the water tower, can be determined from the table from the joint operating schedules of the pumping stations of the 1st and 2nd rises or by f. (23). Considering that the operating mode of the pumping station of the 1st lift is usually taken to be uniform, the coefficient K n becomes equal to one, formula 23 will take the form

W reg = Q days [(K h - 1) / K h) K h / (K h - 1)], (m 3) (28)

The fire safety reserve of water W pp is calculated from the condition that the RFW stores a supply of water to extinguish all simultaneous fires for 3 hours, and the fire occurs during the most intense operation of the network (i.e., during the hours of maximum water consumption)

W pp = 3Q max + W p / p - 3Q n, (m 3) (29)

where 3Q max is the total consumption for 3 adjacent hours, m 3, giving the highest water consumption (determined by the table of total water consumption);

W p / p - the required fire-fighting water supply, determined by f. twenty;

3Q n - pumping by the pumping station of the 1st lift for the same 3 hours.

The supply of water for the own needs of the treatment plant W sob is necessary for washing filters, preparing a coagulant and other needs, it is taken 5 - 8% of Q days.

The number of tanks must be at least 2. It is necessary to select standard tanks according to the catalog, indicate the passport number and dimensions.

1. Tracing the water supply network of the city

Before routing the network on the general plan of the city, the location of water intake and treatment facilities, pumping stations of the 1st and 2nd rises and a water tower are outlined. Water intake facilities are located upstream of the city along the river, taking into account the sanitary protection zone, which must be at least 500m long. To reduce the height of the water tower and, accordingly, its cost, the tower is placed at the highest point of the city. Lines water supply network are usually laid along all streets where there is a building. Only main lines are subject to hydraulic calculation, the minimum diameter of which must be at least 150 mm.

1. Preparation of the network for hydraulic calculation

From the table of total water consumption for the calculated ones, the costs are written out (Table 2), which are necessary for further calculations.

table 2

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Clean water tanks are control and reserve tanks located between the first lift pumping station and the second lift pumping station. They ensure the storage of the regulating volume of water resulting from the fact that pumping station the first lift operates in a uniform mode, while the pumping station of the second lift is uneven.

The clean water reservoir plays the role of a surge reservoir, the presence of which allows the filters to operate at a constant performance. Typically, the capacity of the tank is taken equal to 8 - 12 hours reserve. It is often desirable to have additional headroom in the tanks of the distribution system. Inspection wells in the pool cover must be watertight. Ventilation is required to avoid sudden fluctuations in air pressure in the tank during filling and emptying. The installation of sewer pipes should not be allowed in the area of ​​the clean water reservoir.

Clean water tanks located between treatment facilities(the pumping station of the first lift) and the pumping station of the second lift accommodate the regulating and reserve volumes of water, as a result of which the pumping stations operate uniformly with a time-varying withdrawal of water by consumers.

Clean water reservoirs (with a volume of 100 to 2000 m3) are constructed from reinforced concrete, bricks and rubble stone. The reservoirs are supplied with pipelines for supplying and withdrawing water, as well as for draining and discharging dirty water during repairs. The system for switching the pipelines of the tanks is placed directly in the pumping station room or in special chambers - control units.

Clean water reservoirs (with a volume of 100 to 2000 m3) are constructed of reinforced concrete, bricks and rubble stone. The reservoirs are supplied with pipelines for supplying and withdrawing water, as well as for draining and discharging dirty water during repairs. The system for switching the pipelines of the tanks is placed in the pumping station room or in special chambers - control units.

In this case, pure water reservoirs are considered as additional buffer tanks capable of smoothing fluorine breakthroughs, which are possible in emergency situations.

Clean water tanks and water tower tanks must be equipped with water level indicators. Instrument readings are displayed in the MDP of water supply systems.

Clean water tanks and water tower tanks must be equipped with water level indicators. Instrument readings will be sent to the TIR of water supply systems.