Comments on: Turbo oil seals http://www.ret-monitor.com/articles/1098/turbo-oil-seals/ Specific mission-critical info for professionals Fri, 18 May 2012 08:51:38 +0000 http://wordpress.org/?v=2.7.1 hourly 1 By: Terry http://www.ret-monitor.com/articles/1098/turbo-oil-seals/comment-page-1/#comment-6172 Terry Sat, 22 Jan 2011 07:15:30 +0000 http://www.ret-monitor.com/articles/1098/turbo-oil-seals/#comment-6172 What the author states about wear in a turbo piston ring seal is incorrect. The cross section aspect ratio of these seals are designed so that gas pressure keeps the ring pressed outward against the static housing bore, and the ring does not rotate. The ring is designed to seal on its OD and one end face. Thus the only surface that wears is the end face subjected to sliding contact with the shaft groove. Since the OD surface does not wear, the ring end gap will not change over time. As noted, piston ring seals work effectively as turbo shaft seals only when there is positive pressure in the compressor and turbine housings, and when the pressure delta between the turbine and compressor wheels results in a constant axial thrust force in one direction. Any pressure differential that causes the ring seal to shift axially will cause it to leak. What the author states about wear in a turbo piston ring seal is incorrect. The cross section aspect ratio of these seals are designed so that gas pressure keeps the ring pressed outward against the static housing bore, and the ring does not rotate. The ring is designed to seal on its OD and one end face. Thus the only surface that wears is the end face subjected to sliding contact with the shaft groove. Since the OD surface does not wear, the ring end gap will not change over time.

As noted, piston ring seals work effectively as turbo shaft seals only when there is positive pressure in the compressor and turbine housings, and when the pressure delta between the turbine and compressor wheels results in a constant axial thrust force in one direction. Any pressure differential that causes the ring seal to shift axially will cause it to leak.

]]> By: frank http://www.ret-monitor.com/articles/1098/turbo-oil-seals/comment-page-1/#comment-3754 frank Tue, 20 Jul 2010 13:05:02 +0000 http://www.ret-monitor.com/articles/1098/turbo-oil-seals/#comment-3754 good reading, but i would like to pose a question regarding :turbine shaft wear in way of the sealing piston rings: how can this wear on the turbine shaft be reduced or even eliminated? good reading, but i would like to pose a question regarding :turbine shaft wear in way of the sealing piston rings:
how can this wear on the turbine shaft be reduced or even eliminated?

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