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06 A white paper Here are some properties to look for when specifying a point-of-use filtration system: Reliable particle removal Our three-stage filtration system uses multiple filters to remove ever smaller particles. For example, the first stage removes particles 25 µm or larger, exceeding the ISA-7.0.01 standard. The second filtration stage removes particles 5 µm or larger. The third filtration stage removes submicron- sized particles. This multi-stage approach dramatically improves the air quality at each phase, prolonging the filter element life of the next stage. High water extraction efficiency Running instrument air or instrument gas through three filters in succession removes more than 95 percent of liquid water. High oil removal efficiency General purpose filters do not remove oil contamination. The third stage of the three-stage filtration system is a coalescing filter for oil removal. The filter element's high efficiency design removes oil to 0.01 ppm, or 99.9 percent of oil vapour. Resistance to harsh operating environments Offshore and onshore oil and gas extraction, refineries, hydrocarbon and chemical processing plants all present harsh, corrosive environments. Filters used in these applications need to conform to National Association of Corrosion Engineers (NACE) standard NACE MR0175 for materials used in hydrogen sulfide (H2S) environments common in the petroleum and natural gas industries. Corrosion-resistant 316 stainless steel will resist sulfide stress cracking and discoloration. Seals made from high performance nitrile elastomers will operate across a wide temperature range and stand up to exposure to hydrogen sulfide. A multi-stage filtration system should be designed to meet an application's specific requirements and installed as close as possible to the equipment being powered. This is the best way to protect sensitive instruments, prolong equipment life and prevent unscheduled shutdowns. Anatomy of good point-of-use filtration