ABSTRAK
Analisa terhadap pipa penyalur bawah tanah dengan spesifikasi API 5L PSL1 GradeB dan lapisan eksternal three layer polyethylene serta lapisan internal epoxypolyamide untuk mendistribusikan avtur dari Depot Pengisian Pesawat Udara keBandar Udara yang mengalami kegagalan beroperasi sesaat setelah prosescommissioning dinyatakan baik dan masih dalam masa pemeliharaan setahun.Analisa dilaksanakan dengan melakukan pengujian secara mekanik, kimia, dandilakukan pengamatan secara rinci pada produk karat dengan menggunakanScanning Electron Microscopy serta Energy Dispersive X-Ray. Uji polarisasidilakukan dalam medium Avtur dan medium air hasil proses Horizontal DirectDrilling. Kondisi lingkungan dan sistem elektrikal di lokasi berpengaruh besarterhadap percepatan korosi.

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ABSTRACT
Analyze of underground pipeline with API 5L PSL1 Grade B and three layerpolyethylene external coating and epoxy polyamide internal coating to distributeaviation fuel from the Aircraft Filling Depot to the Airport that failed operateshortly after commissioning process is declared good and still under maintenancea year. The analysis was carried out by testing mechanical, chemical, and detailedobservation on rust by using Scanning Electron Microscopy and Energy DispersiveX-Ray. The polarization test was conducted on Avtur medium and horizontal DirectDrilling process water medium. Environmental and electrical system at the sitehave a major effect on corrosion acceleration.