Regulations

With regard to the raising stations, the deliberation of 4 February 1977 of the Interdepartmental Committee for the protection of waters from pollution and regulations UNI EN 12050-1 and 2 recommend as follows:

• the pumping group must be dimensioned in such way so as to assure the complete removal of drainage waters even in an emergency situation (the flood arrester must intervene only in case of interruption to the electric power supply);
   

• the water catch basin and the pumping group must be dimensioned in a way that on/off times of the pumps do not involve excessive use of the same, and that the standing time of waters in the tank does not cause phenomena of septicization of the sewage waters.

Description and Operation

The raising is the operation in which the sewage system becomes raised to the level of the water in the hydraulic profile of a sewage system or of a treatment system.

Such operation is put into effect through a station consisting of a catch basin equipped with the pumping group of the water.

In the standard version, the surge group is composed of two pumps of the centrifugal submersible type with vortex impeller, specifications for the movement of sewage liquid.

The pumps are equipped with a floater level switch and are fixed to the bottom of the tank through an installation with automatic connection feet and guide tubes.

The respective raising lines consist of two pipes in galvanized steel, equipped with a containment valve, that join to constitute a delivery pipe and a recirculation pipe in the reservoir, both fortified with the capacity regulation valve.

The two pumps operate one for regular use and the other in emergency, as illustrated in the outline at the side. The corrected hydraulic calculation of the raising station is an indispensable condition for being able to comply with the recommendations of the deliberation of the interdepartmental committee.