What is the principle of siphon drainage?
The principle of siphon drainage is that siphon phenomenon can also occur in vacuum. The force that makes a liquid rise is the cohesion of molecules between liquids. When siphon happens, the liquid will continue to flow in one direction because there is more liquid flowing out of the pipeline than in the pipeline, and the gravity on both sides is unbalanced. When the liquid flows into the pipe, the higher it flows, the lower the pressure. If the liquid rises very high in the pipeline, the pressure will be reduced to the extent of generating bubbles (composed of air or other gases) in the pipeline, and the working height of the siphon is determined by the generation of bubbles. Because the bubble will break the liquid, the force between gas molecules at both ends of the bubble will be reduced to zero, thus destroying the siphon effect, so the pipeline must be filled with water. Under normal atmospheric pressure, the siphon works better than in vacuum, because the atmospheric pressure on the nozzles on both sides increases the pressure inside the siphon. Application example: insert one end of the hose filled with water into the water, and the other end is hung outside the water container, and the water outlet should be lower than the water surface. In this way, water will flow out of the container along the hose.
Key points of siphon drainage construction:
The first point: preparation before construction
1, the personnel organization is equipped with sufficient operators, and a special project department is set up for construction management.
2. Send workers with good quality and experience in installing siphon rainwater drainage system to participate in the work of the project department and receive corresponding training before taking up their posts.
3. Carefully study the construction drawings, and work closely with designers and constructors to make a comprehensive construction plan.
4. Set up temporary facilities and arrange the stacking of materials and machinery reasonably.
5, arrange related instruments, machines and tools, auxiliary materials comes into play.
6. Strengthen the supervision of construction personnel on engineering quality and safe and civilized construction.
7, bracket welding process operators must hold relevant certificates.
8, in strict accordance with the requirements of the national construction drawings on-site measurement, and recheck before pipeline installation, to ensure that the pipeline installation fully meets the requirements of construction drawings and acceptance specifications.
Point 2: Pipe connection and installation
When installing pipelines, siphon drainage and drainage system must be designed and installed in strict accordance with the drawings. When siphon drainage is connected with drainage system, butt welding and electric welding pipe hoop joint are generally used.
Point 3: Construction of butt welding connection
1. When welding, the welding parts and welding tool plates must be kept clean.
2, according to the weather conditions during construction, master the correct welding temperature of welding plate.
3, in the process of welding connection to apply the correct and uniform force.
4. The welding cutting surface must be 90 degrees vertical.
The above is the siphon drainage principle and construction points introduced by Bian Xiao. Only when the key points of construction are understood can the construction be put in place. Siphon drainage and drainage system construction should choose a company, and we must choose a regular company, so as to ensure our own interests.