METHOD OF FINISH CLEANING OF CRYOGENIC SYSTEMS Russian patent published in 2012 - IPC B08B3/00 

FIELD: process engineering.

SUBSTANCE: invention relates to machine building, particularly, to surface and cavity cleaning with the help of cryogenic fluids and may be used in production of parts with higher cleanliness requirements. Proposed method comprises arranging cryogenic system in heating chamber, filling said system with liquid nitrogen from storage tank in amount of V_a≈(0.38…0.4)V_s m³, where V_s is system inner volume, isolating said volume by closing the nitrogen feed and drain valves, increasing system and vessel temperature to T≥125.25 K with control over pressure increase to P≥34 kgf/cm² to change fluid into supercritical fluid state, holding it in said state for dissolution-cleaning purposes and discharge of nitrogen via drain valve at system bottom.

EFFECT: higher quality of cleaning.

1 dwg