BS ISO 8573-1:2010 pdf download

BS ISO 8573-1:2010 pdf download.Compressed air Part 1: Contaminants and purity classes.
4 Reference conditions
The reference conditions for gas volumes shall be as follows:
airtemperature 20°C
— absolute air pressure 100 kPa = [1 bar J(a)
relative water vapour pressure 0
5 Compressed air purity classes
5.1 General
The three major contaminants in compressed air are solid particles, water and oil: these are categorized by compressed air purity classes.
These compressed air purity classes group the concentrations of each of the above contaminants into ranges, each range being given its own purity class index. The range limits are aligned to those figures found in practice.
When required, all other contaminants should be stated directly by the specific concentrations allowed, or determined within the compressed air supply; see 6.4.
5.2 Particle classes
The particle purity classes are identified and defined in Table 1. Measurements shall be made in accordance with ISO 8573-4 and, when required, ISO 8573-8.
Where it is determined that there are particles with a size greater than 5 pm, then the classification of I to 5 cannot be applied.
5.3 Humidity and liquid water classes
The humidity and liquid water purity classes are identified and defined in Table 2. Measurements shall be
made in accordance with Iso 8573-3 and, when required, Iso 8573-9.
5.4 Oil classes
The total oil purity classes are identified and defined in Table 3. Measurements for liquid oil and aerosols of oil shall be made in accordance with ISO 8573-2. It is considered that, for classes3, 4 and X, the oil vapour content is not expected to significantly affect the total concentration; therefore, the measurement of vapour is optional. Where it is deemed necessary to measure the oil vapour, then ISO 8573-5 shall be used.
5.5 Gaseous contaminants
No purity classes are identified for gaseous contaminants; the presentation of contaminant levels is given in
6.4. Values for gaseous contaminants shall be measured in accordance with ISO 8573-6.
5.6 Microbiological contaminants
No purity classes are identified for microbiological contaminants; the presentation of contaminant levels is given in 6.4. Values for microbiological contaminants shall be measured in accordance with ISO 8573-7.
6 Designation
6.1 Designation principle
The designation principle of the purity class of compressed air at the specified measuring point shall include the following information in the order given and separated by a colon:
ISO 8573-1:2010 [A:B:CJ
where
A is the purity class for particles; see Table 1;
B is the purity class for humidity and liquid water; see Table 2;
C is the purity class for oil; see Table 3.
6.2 Unspecified designation
When a class for any particular contaminant A. B. or C is not specified, the designation shall be replaced by a hyphen. In the example given below, there is no humidity or liquid water classification.
ISO 8573-1:2010 [A:—:C]
6.3 Class X designation
When the contamination level falls within class X, then the highest concentration of the contaminant shall be given in round brackets. In the example given below, the concentration of liquid water, C, is 15 gIm3.
ISO 8573-1:2010 [A:X(15):C].BS ISO 8573-1 pdf download.