Air/oil separator

An air/oil separator assembly adapted for removal of entrained oil in a gaseous stream, the assembly comprising:

• a head flange defining an air outlet passage in a portion thereof;
• an end plate positioned in a spaced parallel relationship to said head flange;
• a first elongated support member having a first closed outer wall defining a bore in communication with a plurality of openings through said first outer wall, said first support member secured at one end to said head flange and secured at an opposing end to said end plate;
• a second elongated support member having a second closed outer wall defining a bore in communication with a plurality of openings through said second outer wall, said second support member secured at one end to said head flange and secured at an opposing end to said end plate, wherein said first and second support members define a first annular gap;
• an outer jacket having a plurality of openings therethrough, said outer jacket axially aligned with and spaced outward from said second support member, said outer jacket secured at one end to said head flange and secured at an opposing end to said end plate, wherein said second support member and said outer jacket define a second annular gap;
• a first separator element secured in a position proximate to and outboard of said first support member within said first annular gap;
• a second separator element secured in a position proximate to and outboard of said second support member and within said second annular gap;
• and
• a pre-separator element secured in a position proximate to and outboard of said second separator element within said second annular gap;
• wherein said gaseous stream enters said assembly through said openings in said outer jacket;
• wherein said pre-separator and separator elements are sealably secured along opposing edges to said head flange and said end plate, said sealably securing operative to constrain said gaseous flow to pass in sequence through said pre-separator element, said second separator element and then said first separator element to reach said outlet passage;
• wherein said pre-separator and separator elements are operative to coalesce oil from said gaseous stream;
• wherein said elongated support members are operative to prevent collapse of said separator elements and pre-separator elements;
• and
• wherein said pre-separator improves oil removal performance and reduces pressure drop of said assembly by removing a significant amount of oil before reaching said first and second separator elements.