Patent ID: 8663352

Claim:
A system for purifying gas, comprising: a housing including an upper housing part, a middle housing part and a lower housing part, said upper, middle and lower housing parts having upper, middle and lower cylindrical jackets, respectively; first, second and third chambers located in said middle housing part, said upper housing part and said lower housing part, respectively, said first chamber receiving a gas flow to be purified, said second chamber containing a filter device through which the gas can flow, said filter device having filter media separating solid particles and dehydrating gas to precipitate coalesced fluid; a cyclone in said first chamber pre-dehydrating the gas and discharging the solid particles and fluid into said third chamber; at least one tie rod clamping said housing parts together so as to form a closed pressure container; and first and second butt joints between said upper and middle housing parts and between said middle and lower housing parts, respectively, said butt joints have planar surfaces forming directly engaged metal sealing surfaces subjected to a clamping force of said tie rod.