BRITISH STANDARD BS ISO 8573 9:2004 Compressed Air Part 9: Test ....pdf
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How to Test Liquid Water Content in Compressed Air According to BRITISH STANDARD BS ISO 8573 9:2004
Compressed air is widely used in various industries and applications, but it can also contain contaminants that affect its quality and performance. One of these contaminants is liquid water, which can cause corrosion, damage, and inefficiency in compressed air systems. Therefore, it is important to measure and control the liquid water content in compressed air to ensure its reliability and safety.
BRITISH STANDARD BS ISO 8573 9:2004 is an international standard that specifies test methods for determining the liquid water content in compressed air, expressed as the liquid water mass concentration. It is part of a series of standards that aim to harmonize air contamination methods and define purity classes for compressed air. This standard was last reviewed and confirmed in 2017, so it remains current and valid.
This article will explain the scope, terms, methods, and requirements of BRITISH STANDARD BS ISO 8573 9:2004, and how to use it to test liquid water content in compressed air.
Scope of BRITISH STANDARD BS ISO 8573 9:2004
The standard applies to compressed air that has a pressure above atmospheric pressure and a dew point above or below 0°C. It does not apply to compressed air that contains solid or liquid contaminants other than water, or that has a high water vapour content. The standard also does not specify sampling frequencies, locations, or procedures, which should be determined by the user according to the specific application and objectives.
Terms and definitions of BRITISH STANDARD BS ISO 8573 9:2004
The standard defines the following terms and symbols related to liquid water content in compressed air:
Liquid water content: the mass of liquid water per unit volume of compressed air at a given temperature and pressure.
Liquid water mass concentration: the ratio of the liquid water content to the volume of compressed air at a given temperature and pressure.
Liquid water mass flow rate: the product of the liquid water mass concentration and the volume flow rate of compressed air at a given temperature and pressure.
Liquid water removal efficiency: the ratio of the difference between the liquid water mass flow rates at the inlet and outlet of a device or system to the liquid water mass flow rate at the inlet.
Symbol for liquid water content: w
Symbol for liquid water mass concentration: c
Symbol for liquid water mass flow rate: q
Symbol for liquid water removal efficiency: η
Methods of BRITISH STANDARD BS ISO 8573 9:2004
The standard specifies two methods for measuring the liquid water mass concentration in compressed air:
Method A: Gravimetric method. This method involves collecting a known volume of compressed air in a container, separating the liquid water from the air by condensation or filtration, and weighing the collected liquid water. The liquid water mass concentration is calculated by dividing the mass of liquid water by the volume of compressed air.
Method B: Volumetric method. This method involves passing a known volume of compressed air through a calibrated measuring device that indicates the volume of liquid water collected. The liquid water mass concentration is calculated by dividing the volume of liquid water by the volume of compressed air.
The standard also specifies two methods for measuring the liquid water removal efficiency of a device or system:
Method C: Gravimetric method. This method involves measuring the liquid water mass flow rates at the inlet and outlet of a device or system using method A, and calculating the liquid water removal efficiency by dividing the difference between the inlet and outlet values by the inlet value.
Method D: Volumetric method. This method involves measuring the liquid water mass flow rates at the inlet and outlet of a device or system using method B, and calculating the liquid water removal efficiency by dividing the difference between the inlet and outlet values by the inlet value.
Requirements of BRITISH STANDARD BS ISO 8573 9:2004
The standard specifies the following requirements 248dff8e21