Two indicators to detect air filtration equipment holistic approach to detect the main air filter efficiency and leakage coefficient, the sum of these two indicators for individual equipment is 100%, while on the integrity of the filter is detected more complex. Brief detection method, these methods are from the actual operation of the results obtained with the implementation of the standards are not contradictory, but because the evaluation is based on the average, so it was not included in the calculation of error and confidence interval , the statistical characteristics of the particles can also be taken into account. Accordance with the relevant provisions of the method used to evaluate the efficiency of the filter installed, just calculate the average parameters can also be applied statistical concepts, standard deviation and 96% confidence range Cottle air compressor, but some experts that such a method does not make much sense compressor price, because the whole method is based on the actual assumptions can not be completed. 1, the first assumption for air filter inlet particle concentration in the entire surface area of ??the terminal is not changed, so how to detect? The answer is unable to detect air compressor brands, outliers can reach concentrations of 1/10 or even several times. 2. The second assumption is assumed filter outlet wind speed is constant, but the reality of the wind speed is not possible to maintain such a state, but allows a certain variation within ± 20% of the average value . 3. The third assumption is based on scanning speed, which is also require constant, but when the actual work of the hands of people can not maintain strict uniform motion, would have a slight jitter and pauses. So, over this series of assumptions and the actual situation is very far, a variety of factors that are very random appearance of reality, that these assumptions to avoid reality, clearly beyond these methods 96% confidence limits of the range should be considered. 5 grade pressure vessel pressure vessel according to the security situation in the security situation, is divided into five levels. Security level should be assessed based on the test results, in order to assess which projects to assess the level of the lowest grade. 1: pressure vessels manufactured complete information; design, manufacturing quality comply with the relevant regulations and standards; can be used safely under design conditions. 2: Factory basically complete information; design, manufacturing quality in line with the requirements of the relevant regulations and standards; according to the inspection report, there are certain not to endanger the safety, do not fix general defects; in the regular inspection cycle and regulations, the provisions of can be used safely under the operating conditions. 3: Factory Data not complete; the main material, strength, structure, in line with the requirements of the relevant regulations and standards, there are some non-compliance with the relevant regulations or standards issues or defects, according to the inspection report, confirmed as regular inspection cycle and regulations in inside, under specified operating conditions, can be used safely. 4: Factory information is not complete; the subject material is unknown or does not comply with the relevant provisions; the structure and intensity does not meet the requirements of the relevant regulations and standards; there are serious deficiencies; according to the inspection report, confirmed the air compressor in the regulations of the test period, the need Under the provisions of the operating condition monitoring use. 5: serious defect, it is difficult or impossible to repair after repair value or no repair is still hard to ensure the safe use; inspection report concluded sentenced to waste. It should be noted: the security situation in the level of defects, refers to the existence of the state of ultimate pressure vessel, such as a defect has been eliminated, places to determine the status of the security situation after the elimination of the pressure vessel grades. Air compressor brands, Qin Wei Air Compressor Brand authority (certified), provided by the Xianyang compressor Compressor Co., Ltd. Qin Wei. Xianyang Qin Wei Compressor Co. (www.xykyj.cn/) is Xianyang, compression, separation equipment leader, over the years, the company implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Qin Wei Air leadership with the staff warmly welcome all inquiries negotiations to create Qin Wei Air a better future.