Analisa Perbandingan Efisiensi Metode SACP dan ICCP Underground Pipe Sistem Perpipaan Fire Fighting – PLTGU Bekasi
Abstract - The Bekasi PLTGU company has an underground fire extinguisher pipe using A53 grade B pipe which has a position close to the sea so it is easy to have a large enough corrosion potential. Additional corrosion protection is still needed to make the pipe more durable even if the underground pipe is coated. Therefore, corrosion protection with an additional anode is required to protect the pipe. There are two types of corrosion protection compared, namely SACP (Sacrificial Anode Cathodic Protection) and ICCP (Impressed Current Cathodic Protection) to determine their efficiency. The method used in this study is the immersion test and manual calculations referring to company data. The immersion test using the weightloss method refers to the ASTM G31 standard, carried out for 336 hours with a solution of HNO3 and NaCl adjusted to the soil data. While the lifetime calculation refers to the API 570 standard. Technical and economic calculations are carried out to determine the number of anodes and the cost difference between SACP and ICCP. Technical calculations from the immersion test and manual calculations obtained a corrosion rate of 0.013036234 mm/year. With a 6” diameter pipe, the remaining lifetime for SACP is 255 years and ICCP is 336 years. In the 8” diameter pipe, the remaining lifetime for SACP is 256 years and for ICCP is 337 years, while the required number of anodes for SACP is 123 units and ICCP is 24 units. From the economic calculation, the total cost of SACP is Rp. 479,500,000.- while ICCP obtained a total cost of Rp. 357,898,800.- so the cost difference between SACP and ICCP is Rp. 121.601.200.-. Based on the results of these technical and economic calculations, it is known that the most efficient corrosion protection method for underground fire fighting pipes is ICCP.