Matters to be noted when piping compressed air pipelines When piping the main pipeline, the pipeline must have an inclination of 1° to 2° to facilitate the discharge of condensed water in the pipeline. Design and calculation of pipelines The air compressor is a complete system composed of pipelines, valves, etc. and other equipment. Improper design, calculation and installation of pipelines will affect the economy and reliability of the entire system, and may even cause serious destructive accidents.
A. Pipe inner diameter: The inner diameter of the pipeline can be obtained by the following formula according to the pre-selected gas flow rate: In the formula, is the inner diameter of the pipeline (); is the gas volume flow rate (); is the average flow rate of the gas in the pipe (), and the average flow rate of compressed air is given in the following table. Recommended average flow rate in pipe Gas medium Pressure range (Mpa). Average flow rate (m/s) Air 0.3～0.6 10～20! 0.6～1.0 10～15 1.0～2.0 8～12 2.0～3.0 3～6: Note: The recommended values in the above table are the recommended values of compressed air flow rate in the gas transmission main line (or trunk pipe); for pipes with a length of less than 1m or pipe accessories - inlet and outlet of coolers, purification equipment, pressure vessels, etc., there are installation size restrictions, and the instantaneous gas flow rate can be appropriately increased.
(3) The branch line must be connected from the top of the main line to prevent condensate in the main line from flowing down to the working machinery or back to the air compressor.
(4) The pipeline should not be arbitrarily reduced or enlarged, and the pipeline must use a tapered pipe. If a tapered pipe is not used, turbulence will occur at the joint, which will cause a large pressure drop and have an adverse effect on the life of the pipeline.
(5) If there are purification buffer equipment such as air storage tanks and dryers after the air compressor, the ideal piping sequence should be air compressor + air storage tank + dryer. The air storage tank can filter out some condensed water and also has the function of lowering the gas temperature. The load of the dryer can be reduced by introducing compressed air with a lower temperature and less water content into the dryer.
(6) If the air usage is large and the time is very short, it is best to install another air storage tank as a buffer. This can reduce the number of times the air compressor is loaded and unloaded, which is of great benefit to the service life of the air compressor.
(7) Try to reduce the use of elbows and various valves in the pipeline.
(8) The ideal piping is that the main line surrounds the entire factory, so that compressed air can be obtained in both directions at any location. For example, when the air usage of a branch line suddenly increases, the pressure drop can be reduced. In addition, an appropriate valve group should be configured on the annular main line to facilitate cutting off during maintenance.
(9) When the air output pipelines of multiple air compressors are connected in parallel, there is no need to install a check valve at the output end of the air compressor.