Step 1. Determination of the maximum air flow Identify capacity air receivers (passport data / information on the tag), completely fill air receivers, connect the consumers of compressed air, measure the fall time pressure of max means. to min means. = Min allowable working pressure in the network calculate the air flow according to the formula: Q = (V xn) x 60 / t (l / min), where: Q – Air flow (l / min), V – Receiver Capacity (L) n – the difference maxdavl-mindavl (optimal difference maxdavl-mindavl = 2 kg/cm2 (bar)), t – Time (sec). Step 2. Find a selection of the compressor the compressor can be as follows: A = (Q xk) / r (l / min), where A – the compressor (L / min), Q – air flow, calculated using the formula in section 1, k – coefficient equal to: 1,6 – for semi-piston compressors, 1,5 – for reciprocating compressors for industrial performance, 1,4 – reciprocating compressors for high-and 1,2 – for screw compressors. r – coefficient of efficiency compressor head: 0,65 – for single heads, 0,75 – two-stage and more heads, 1,0 – for the screw heads. Note: for compressors of household type, since it is impossible for periodic operation, the calculation does not applicable..
Each of the above systems is used exactly as prescribed. For example, centrifugal pumps suitable for pumping clean or slightly polluted water because they fairly simple and allow you to adjust supply and pressure in a wide range. A related technique of vortex is characterized by small size and low cost (by 20-30% cheaper), but it has several disadvantages that Several narrows its scope. Outs of such equipment are unpleasant high-frequency noise and increased demands on the purity of water. If the owners have decided to save money and become a vortex pump, it is better place as much as possible from the bedrooms, for example, in the back room, and since this device is sensitive to particulate matter contained in tap water, also add the system filters the mechanical treatment.
Caution should be approached to purchase self-priming pump stations with ejector. On sale are complex surface arrangement, capable, according to the manufacturer, to raise water from 40-50-meter depth. They are cheaper units with submersible pumps and downhole, but at the same time characterized by low efficiency, low consumption and unstable. In addition, when the ejector pollution, and it happens quite often, the workers characteristics of the station are deteriorating. from pressure to flow main characteristics of any pump – flow and pressure. Feeding is the volume of liquid pumped per unit per unit time, and pressure – the total number of energy imparted to it by a unit mass of liquid. In a simplified form of pressure, expressed in meters water column indicates the altitude at which you can pick up water.