ISO 12500-1:2007 PDF

Overview

ISO 12500-1:2007 - "Filters for compressed air - Test methods - Part 1: Oil aerosols" specifies the test layout and procedures for evaluating coalescing filters used in compressed-air systems. The standard defines how to measure a filter’s ability to remove oil aerosols and the associated pressure drop, and presents one method of reporting filter performance as outlet oil aerosol concentration (mg/m³) under defined rating parameters.

Key topics and technical requirements

• Test layout and equipment: Typical test rig arrangement (air supply, aerosol generator, flow control, sensing points, filter under test) and sampling points are defined.
• Standard rating parameters: Reference conditions include inlet temperature (~20 °C), test pressure (commonly 700 kPa / 7 bar(e)), rated flow (100% of manufacturer’s rated flow) and inlet oil-aerosol challenge concentration (documented test values).
• Aerosol challenge: Poly-disperse oil aerosol with mean particle size ~0.15–0.40 µm (by particle count). Care to ensure aerosols, not wall flow, enter the filter.
• Flow and Reynolds number: Tests use the manufacturer’s maximum rated continuous flow; minimum Reynolds number in the inlet pipe shall be 4 000 to maintain turbulent flow.
• Conditioning and wet pressure drop: Filters must reach equilibrium (liquid oil visible in housing and pressure-drop change