船舶防海生物装置.pdf

MGPS DOCUMENT K.C. LTD. REV(0) : 14/10/05 INTRODUCTION FOR M.G.P.S The system is based on the electrolytic principle consisting of copper and aluminium anodes which are fed with a fixed impressed electrical current from control panel. The System is designed to give continuous protection with the minimum maintenance against marine growth and corrosion caused by marine growth in seawater service line. It will provide complete protection through the full designated anode life. Excessive anode current will result in an excessive rate of consumption of the anodes, and then reducing their life and possibly leaving the water system unprotected if the anodes are worn out. SYSTEM PRINCIPLE The system produces anti-fouling ion using specially alloyed anodes. There are two types known as the CU(copper) anodes and AL(aluminium) anodes. CU Anodes are manufactured from copper as major part for system. The copper anode produces ions which are transported by the seawater and carried into the pipework system to prevent marine growth. They release ions during electrolysis as following reactions. Anodic reaction Cu → Cu2+ + 2e Cathodic reaction 2H O + 2e → H + 2OH- 2 2 AL Anodes are manufactured from aluminium as supplementary part for system. The slow dissolution of the aluminium anode produces ions which spread throughout the system and produce an anti-corrosive layer on the internal surface of sea water cooling lines. They release ions during electrolysis as following reactions. Anodic reaction Al → Al3+ + 3e Cat