Nanjing Nanlan Environmental Protection Equipment Manufacturing Co., Ltd. is a professional electromechanical integrated enterprise dedicated to the development of environmental protection culture, integrating scientific research, design, production, internal and external sales, and service. Our leading products include submersible thrusters, submersible aerators, submersible axial flow pumps, submersible mixed flow pumps, peripheral transmission mud scrapers and other sewage treatment equipment. Our sales network covering all parts of the country provides users with the most comprehensive services at any time, which has won the trust of our customers.
The gap between the grille bars in front of the water pump should be determined based on the pump's ability to allow dirt to pass through.
In the design of sewage treatment systems, two grids are installed, usually with a middle grid in front of the pump room and a fine grid behind the pump room. At the same time, the gap between the grid bars should meet the following requirements:
Manual clearance is 25-40mm;
Mechanical clearance is 16-25mm;
The maximum gap is 40mm.
When there is no local operating data available, empirical data can be used for the amount of slag in the grid.
4. The daily amount of slag is 0.2m3, and mechanical cleaning is generally used
Mechanical grilleNot less than 2 units, with one in use and one as backup.
The water flow velocity in the channel in front of the grille is generally 0.4-0.9m/s, the flow velocity passing through the grille is generally 0.6-1.0m/s, and the inclination angle of the grille is generally 45 ° -70 °
Mechanical grilleGenerally, it ranges from 60 ° to 70 °, and special types can reach up to 90 °.
6. The water channel in front of the fence is designed to gradually expand to prevent water blockage and backflow. The head loss through the grille is generally between 0.08 and 0.15 meters.
7. If the groove for placing the grating exceeds 7m, a steel wire rope type grating machine should be selected; Arc grilles should be used for depths of 2m or less; Chain type cleaning machines are recommended for medium depths.
8. The working width of a single grating machine is generally not greater than 3.0m, and multiple machines can be used if it exceeds this limit.
9. The height of the bars is generally determined by the normal high water level. When a reliable automatic device is installed in the current pool, the height of the bars should be at least 1.0m higher than the normal high water level to increase safety. If there is no reliable self-control equipment, the height of the bars should consider very high water levels.
10. A workbench must be set up between the grids, and the countertop should be 0.5m higher than the design water level in front of the grid. The width of the aisle on both sides of the workbench should not be less than 0.7m, and the width of the aisle on the front of the workbench should not be less than 1.2-1.5m. The workbench should have safety and flushing facilities.