What is the function of a grating?
1 Answers
Grating is the most important auxiliary equipment in sewage pumping stations. Generally composed of a set of parallel bars, it is installed at an angle of 60°~80° at the inlet of the pump station's collecting tank. A working platform should be set up behind the grating, usually 0.5m higher than the highest upstream water level. For manually cleaned gratings, the platform should be at least 1.2m long along the water flow direction, while for mechanically cleaned gratings, it should be at least 1.5m long, with a passage width of no less than 0.7m on both sides. 1. Grating specifications: (1) By shape: Gratings can be divided into flat and curved types. Flat gratings consist of bars and a frame. Curved gratings can be further divided into fixed curved gratings and rotating drum gratings. (2) By bar spacing: They can be classified into coarse (50~100mm), medium (10~40mm), and fine (1.5~10mm) gratings. Both flat and curved gratings can be made in these three types. 2. Related information: Since gratings are crucial for sewage treatment, newly designed sewage treatment plants usually employ coarse and medium gratings, or even coarse, medium, and fine gratings. Based on cleaning methods, gratings can be manual or mechanical. Manual cleaning is suitable for small sewage treatment plants when the residue volume exceeds 0.2m.
