Pump selection issues

1. A backup pump is not required in the rainwater pumping station. Refer to Article 5.4.1 of the \"Code for Design of Outdoor Drainage Systems (2011 Edition)\” (GB 50014-2006): The selection of water pumps shall be determined based on factors such as the designed flow rate and required head, and shall meet the following requirements: . . . . . . 2 The sewage pump room and the combined sewage pump room should be equipped with standby pumps; when the number of operating pumps is 4 or less, it is advisable to have 1 standby pump. When the number of working pumps is 5 or more, it is advisable to have 2 backup pumps ； When there are 2 standby pumps in the submersible pump room, 1 can be kept on site as a standby and 1 stored as a backup. A rainwater pumping station may not be equipped with a backup pump. Rainwater pumping stations in overpass roads can be equipped with backup pumps depending on the importance of the station. . . . . . . II. Volume of the sump in the rainwater pumping station. Refer to Article 5.3.1 of the \"Code for Design of Outdoor Drainage Systems (2011 Edition)\” (GB 50014-2006): The volume of the collection tank shall be determined based on factors such as the designed flow rate, the capacity of the pumps, and the operating conditions of the pumps, and it shall meet the following requirements. . . . . . 2 The volume of the sump in the rainwater pumping station should not be less than the water output of the largest pump over 30 seconds. . . . . . . III. Design flow rate of the rainwater pumping station. Refer to Article 5.2.2 of the \"Code for Design of Outdoor Drainage Systems (2011 Edition)\” (GB 50014-2006): The design flow rate for rainwater pumping stations shall be determined based on the design flow rate of the main inlet pipe of the pumping station. If the designed flow rate for rainwater is 1400 L/S and this value is correct, it is feasible to consider using two pumps (with a designed flow rate of 700–800 L/S per pump), and a reservoir volume of 50 m3 would be appropriate.

One in use and one as a backup; depending on the volume of the rainwater tank and the area of the plant exposed to rainfall, a pump with a capacity of around 50 m3 will suffice.

One in use and one as a backup; depending on the capacity of the rainwater tank and the area of the plant exposed to rainfall, a pump flow rate of around 50 m3 is sufficient.

Estimate the hourly water consumption and required head to select the pump

Estimate the water consumption per hour and the required head, then select the pump accordingly