Basic principles:nomenclature and units

NOMENCLATURE AND UNITS

Nomenclature

Unless otherwise specified in the text, the following symbols are used consistently throughout this book:

Basic Principles-0095Basic Principles-0096

Note on units

SI units are used consistently throughout this handbook. Certain conventions within the SI structure are used generally throughout the European compressed air industry. These are as follows:

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Conversion factors

For the convenience of those readers more familiar with Imperial units, the following conversion factors may be used.

The values quoted are adequate for most engineering purposes, ie accurate to at least 3

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Basic Principles-0099TERMS AND DEFINITIONS

Terms and definitions used in the Compressor Industry (see also BS 1571 and BS 5791):

Basic Principles-0100Basic Principles-0101Basic Principles-0102

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Hydraulic accessories:Beta ratio

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Beta ratio It is a measure of a filter's efficiency. It is defined as the number of particles upstream from the filter that are larger than the micron rating of the filter, divided by the number of particles downstream from the filter larger than the micron rating of the filter. The example illustrated below demonstrates the concept of beta ratio quite clearly. From Figure 7.4, it is seen that there are 200 particles upstream from the filter which are larger than 3 !Jm in size. A filter having a lower beta ratio is less efficient because it allows more particles through it. Again referring the example above, it is seen that while the filter at the top allows 100 particles through, only 1 particle is allowed to pass through the filter at the bottom. The beta ratio for the filter at the top is given by f3 = 200/100 = 2 which is a less efficient value, whereas the beta ratio for the filter at the bottom is given by f3 = 200/ 1 = 200 which is a more efficient value. The followi...
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