»
»
Maintenance
THE WORLD ’ S ONLY TRULY NON-STOP BIO-FOULING & DEPOSIT PROTECTION SYSTEM
Figure 3 . A transverse cross-section shows a rounded pit with some tunneling just beginning ( arrow ). Approximately 35 % of the wall thickness has been lost at the deepest point .
Figure 4 . The pit from Figure 4 after grinding approximately another 0.010-in . The tunneling pit was clearly defined with oxide in the pit . Approximately 57 % of the wall thickness was lost at the deepest point .
Metallurgical analysis The eddy current indications in the submitted condenser tubes were a result of fine MIC pitting on the ID surface . Custers of very fine , tunneled pits were found at each of the indication sites . Subsurface tunneling pits under uniform films that are rich in manganese , especially in chlorinated waters , is common in stainless steels where MIC has occurred .
Conclusion A comprehensive testing program is essential for the safe , reliable operation of any plant . Often a failure in one component will lead to damage and failures downstream with other components . In this case , neglecting condenser tube leaks can lead to failures in the HP feed water heaters . While the ID flaws were easily understood to be MIC , the OD indications were found out to be also MIC . They started out as a small tunnel on the OD and then opened up closer to the OD of the tube . Therefore , eddy current testing identified them as OD flaws when in fact , they were just really deep ID flaws . As a result of these findings , the plant implemented a complete and regular testing program on the condensers in this plant , they now conduct 100 % eddy current test on the condenser during every outage on both units . Since implementing this testing program , they have not had any online tube leaks since .
www . heat-exchanger-world . com
Agitate is a revolutionary solution to industrial Clean-in-place systems . Borne from 16 years of R & D and experience in the commercial shipping industry , our Ultrasonic Anti-Fouling Technology prevents and controls bio-fouling and deposits on any hard surface such as evaporators , plate coolers , pumps , condensers , salt-water intakes and pipelines , caissons and Heat Exchangers .
Agitate is a fit-and-forget system . Once our energy efficient transducers are fitted , your internal and external surfaces are protected 24 / 7-365 by the power of ultrasound . There is no need for regular site call outs , our self-tuning ultrasonic technology maintains clean surfaces with permanent low intensity ultrasonic protection .
Industries
Oil / Gas & Energy Maritime Food and Beverage Steel Works Water Handling
District Cooling Paper Mills Fire Suppression Aquaculture Dairies
ATEX approved transducers for zones 0 , 1 & 2
Agitate virtually eliminates the need for disassembly , chemical dosing , extensive cleaning , production downtime and reassembly delays .
AGITATE ULTRASONICS
Sonihull House , 11-12 Mercia Village , Torwood Close , Westwood Business Park , Coventry , CV4 8HX , UK
info @ agitateultrasonics . com www . agitateultrasonics . com
Reduces System Downtime , Unplanned Cleaning and Unscheduled Maintenance
Increase the Efficiency and Lifespan of Heat Exchangers and Evaporators
Permanent Non-Stop Cleaning for Pneumatic and Liquid Pipes
Prevents Internal Pipe and Valve Deposits Without Downtime
Fewer Deposits , Increased Efficiency and More Profits
Eliminates Sludge and Keeps Fire Systems Operational Longer