Air compressor selection issues
Thread Content
Dear experts: Hello, I am planning to acquire an air compressor for pipeline purging. I’m not sure how to choose the right model – I need the pressure in a pipeline with a volume of 30 cubic meters to reach 6 kilograms within half an hour. How should I calculate this? I would appreciate some guidance; I’m a bit confused. Thank you!
Oh, this requires a blast purging method. Just check out renting air pumps on the market. Check the flow rate of the air pumps that are available; if time is tight, use more pumps, and if there’s no rush, use fewer. A standard air pump (small piston compressor) has a flow rate of 60 L/min and a pressure of 0.7 Mpa (adjustable). For reference.
The one with four wheels below can exert a pressure of over ten kilograms
I’m worried that this air pump inflates and pressurizes too slowly; the purging process itself already takes a long time
I’m worried that this air pump inflates and pressurizes too slowly; the purging process itself already takes a long time
I’m worried that this air pump inflates and pressurizes too slowly; the purging process itself already takes a long time
It’s okay to use blasting; 30 cubic meters isn’t considered large. Otherwise, the costs will outweigh the benefits. In fact, if it’s considered in advance, acid washing and sandblasting for rust removal should be carried out before installation, followed by TIG welding as a base layer. After completion, a slight vibration or blowing should be sufficient. Otherwise, this method has to be adopted to speed things up. Oh, before blowing, it’s also necessary to strike the pipe to create some vibration.
At a pressure of 6 kilograms, the temperature is 40°C; the volume is 30 m3. The total volume calculated is 30 * (6 + 1) * 273 / (273 + 40) = 183.2 cubic meters. Filling takes half an hour, so the flow rate is 183.2 cubic meters / 30 = 6.1 cubic meters per minute. Assuming an outlet exhaust volume of 0.1 MPa at 20°C for the air compressor, the actual flow rate is 6.1 * (273 + 20) / 273 = 6.5 cubic meters per minute; therefore, an air compressor with a flow rate of over 6.5 cubic meters per minute can be selected
Expert, are there any criteria I can use to check?
So it’s resolved by getting angry, is that it, guys?
I don’t know; how do you plan to connect the purge pipeline? Is it using quick connectors? Are it still welded pipes, controlled by valves? In the former case, some large piston air compressors can achieve 3.2 m3/min at 7 Bar; in the latter case, there are many options available, and ordinary screw air compressors can meet your requirements.