We perform complex audit of pressure air, which is from measuring of leakage in distribution through measuring of utilization of individual compressors to simulations of changes in the system of production, including measuring of efficiency and determination of the return of investments.
Measuring of utilization of compressors is based on the principle of measurement of power feed of individual compressors and on measurement of pressure in the system. Measurement is carried out by sampling of one second as a standard for the period of one week. We are able to record values from even 8 compressors. Utilization of individual compressors, their capacity reserves, etc. can be deducted from measured values. Simulation of compressor operations considering addition of another compressor to the system can be carried out, their operational costs and achieved savings can be calculated.
While measuring efficiency of pressure air production, power of individual compressors contributing to supply of compressed air and concurrently flow of compressed air are measured. To measure the compressor capacities, measuring line with flow sensor that works on thermic principle and its output is so called standard – standardized – speed of flow (volume flow of sensed medium (in Nm/s, Nm3/h) related to the pressure of 1013 hPa and temperature of +20 °C is used.
These relative conditions are defined by ISO1217 and according to the standard, all performances of compressors are stated. The sensor is intended for installation by inserting into the fixing vertically to the piping and the axis of flow; it is equipped with current output of 4–20 mA for connecting to evaluation equipment. Thermic probe is calibrated with measurement accuracy to 1%. For installation the minimum calming length on the measuring line of c. 20* pipe diameter is requested.
The principle of measuring dew point is on the basis of detection of the change of electrical disposition of sensitive material of niobium probe at different content of humidity molecules in compressed air. Principle of the measurement of mechanical impurities content is based on the check of validity and compactness of the used filtration insert. It is visual and mechanical verification of condition of the insert (catchment is documented by filter producer's documentation).
To measure leakage of compressed air the Leak-Detect device that measures ultrasound signal of leaking air is used. Most often the aim of the measuring is detection and identification of places, where usually the most significant loses incur. They are usually various fittings, valves and other items in compressed air distribution. We need to realize that all distributions show leakage – in new distributions there is leakage reaching to 10% of overall capacity and in older distributions there can be leakage reaching to 50 % of the capacity. By repairing the leakage places we can achieve significant savings on production of compressed air.
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