PENGARUH PEMBAGIAN LUASAN ANODA TERHADAP LAJU KOROSI DAN LIFETIME MATERIAL API 5L X65M PSL PADA PIPA UNDERGROUND

Abstract

Abstract – SACP (Sacrificial Anode Cathodic Protection) or cathodic anode protection is one type of corrosion protection method used to inhibit corrosion rates. Cathodic anode protection works by utilizing the potential difference between the anode and cathode. The currents produced by the sacrificial cathodic anode protection system are very limited because they only originate from the potential difference between the anode and the cathode. Based on the above problems, the distribution of sacrificial anodes must be carried out evenly so that the protective current can reach all metal parts. This research was conducted to test cathodic protection of the sacrificial anode method with different variations in the area of anode. Variations in the area are 60 x 30 mm, 30 x 30 mm, 60 x 15 mm and 30 x 15 mm. After that technical calculations can be made. These calculations include the calculation of corrosion rate, lifetime material and the need for anodes for sacrificial cathode anode protection installations.The test results show that the division of anode area can affect the value of corrosion rate and material lifetime. The results of the best protection comparison were produced by 4 pcs anodes measuring 30 x 15 with the greatest corrosion rate 0.002122829 mm / y at soil pH 4 and the smallest corrosion rate 0.001284870 at ph soil 6. The highest lifetime material value was 283.71 years at 4 pcs anodes measuring 30 x 15 mm. The smallest lifetime value of 82.12 years occurs on 1 pcs of anodes measuring 30 x 15 mm. The final calculation results about the need for anodes for sacrificial cathodic anode protection installations were 118 units. These results are obtained from calculations based on ASTM G1-03 standards, API 570 and DNV RP-B401.