Ultrasonic detection and vibration analysis

ULTRASONIC DETECTION AND VIBRATION ANALYSIS

U l t r a s o n i c detection and v i b r a t i o n a n a l y s i s have been combined in a maintenance p r o g r a m m e which has reduced the t i m e spent on o v e r h a u l s of e n g i n e / c o m p r e s s o r s at Consolidated Gas Supply Corporation, West Virginia. I n s t r u m e n tation c o n v e r t s the u l t r a s o n i c and mechanical v i b r a t i o n within engines into p e r m a n e n t p r o f i l e s (Figs 8 and 9). The p e r m a n e n t r e c o r d s a r e obtained by double exposure of P o l a r oid film to t r a c e s on an oscilograph. The u l t r a s o n i c

m e a s u r e m e n t s were c a r r i e d out with the Delcon Ultrasonic T r a n s l a t o r detector, which is a portable, b a t t e r y - p o w e r e d i n s t r u m e n t working in the range 36-44kHz. Fig 10 shows the u l t r a s o n i c pickup in position on a 2000hp integral engine/ compressor. Fig 8 shows the oscillograph from a cylinder in good condition, while Fig 9 shows those from c y l i n d e r s showing symptoms of damage. Consolidated Gas Supply Corporation, C l a r k s b u r g , West Virginia, USA Delcon Division, H e w l e t t - P a c k a r d Company, 333 Logue Avenue, Mountain Avenue, California 94040, USA

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