This paper studies the effect of oxygen in methanol on the structures and growth kinetics of iron sulfide scales. Gravimetric weight analysis was used to evaluate the corrosion mechanisms and rates. Scanning Electron Microscope/ Energy Dispersive X-ray Spectrometry (SEM/EDX), Optical Microscope and X-ray Diffraction (XRD) were used to analyze the scale.
A polyamide 12 (PA12) material has been specifically engineered. After laboratory testing, a significant project was developed to install PA12 in a sour, multiphase, pipeline. Material qualification program is discussed. Performance of the liner in service and inspection of test coupons are described.