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The paper presents results on the experimental work of crystallization and prevention of barium sulfate scaling in the vibrated pipes with flowing water and the use of green chemical inhibitors. The duplicate scaling experiments were performed on the water flowing in pipes under mechanical vibration with varying frequency (0, 4, and 8 Hz). The result shows an increase in vibration frequency, leading to an increasing scale deposition rate. Five green inhibitors were examined, namely; formic acid; EDTA; tartaric acid; oxalic acid and acetic acid. Under the influence of vibration, the scale retardation capability of inhibitors could be presented consecutively: formic acid; EDTA; tartaric acid; oxalic acid and acetic acid. In particular, at 8 Hz frequency, the best scale retardation was obtained with 10 ppm of formic acid addition. The barite crystal scale was formed on pipes as confirmed by XRPD (X-ray powder diffraction) method, whereas a rosette-shaped like morphology could be developed in the crystal as observed by SEM. Additionally, the crystal surface of barite has changed to be smoother, when the frequency of vibration increased. This finding of the study is expected to add knowledge of barite scale formation in the vibrated piping system and the use of chemical additives for the scale growth prevention.

EFFECTS OF FIVE GREEN INHIBITORS OF CONTROLLING BARITE CRYSTAL GROWTH IN FLOW-INDUCED VIBRATION IN PIPE