As for the last two parameters, it is important for us only in terms of availability or not, adequate power supply. This may allow us to preselect the device, as the screw compressors are only for three-phase (400 V), but only smaller piston compressors are supplied with 230V (up to a capacity of 200-250 l / min).
Another important parameter is the maximum working pressure of the compressor. Unfortunately, often this parameter is considered the most important. Only the smallest piston compressors offered (capacity approx. 100 l / min) produce air with a maximum pressure of 8 bar. However, all larger compressors are able to achieve maximum pressures of 10-11bar (in the case of reciprocating compressors) and 10-13bar (in the case of screw compressors). In addition, most of the machines, devices and pneumatic tools should work at the maximum pressure of the working medium, in the range of 6-6.5 bar. This fact causes, often wrongly, that in fact every compressor is able to properly handle any pneumatic tool.
The most important parameter that we should follow when choosing the right compressor is its efficiency . Under this concept is the amount of air produced by the compressor per unit of time (most often given in l / min). In addition, it is important that this is the parameter of effective efficiency or efficiency on the pressing , because only these values show the actual efficiency of the device. Some manufacturers give the suction performance parameter, which has nothing to do with the actual efficiency of the device (it is significantly overstated).
In connection with the above, when choosing a suitable compressor, we should first of all rely on information from pneumatic machines and tools about their consumption of compressed air. As a result, adding up the needs of individual components of the system, we are able to estimate the size of the compressor we will need. Additionally, it should be remembered that the compressor can not be “in contact”. For screw compressors, this stock should be around 20-25% of capacity. However, in the case of reciprocating compressors, in the case of continuous work with tools, this inventory should amount to at least 50-60% of the compressor capacity and in the case of intermittent operation, at least 30% of the capacity.
Another important aspect is the appropriate selection of connectors and diameters of power cords. This is to provide the right amount of air (flow) from the compressor tank to the pneumatic tool we work with.
For the most popular tools, such as � “impact wrenches, air consumption, depending on the model, is 200-400 l / min. A similar or slightly greater appetite for compressed air is characterized by: drills and pneumatic screwdrivers, mandrel grinders, smaller pneumatic hammers (but this also results from the nature of the tool, which usually works for a long time). Less demand for air is characterized by tools such as: ratchet wrenches, staplers and pneumatic tweezers, pneumatic riveters. At the other extreme, high-speed tools such as angle grinders, oscillating grinders, pneumatic agitators, and larger pneumatic hammers can be positioned.