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Thermal spraying aluminum process for lean glycol storage tank in LW3-1 jacket legs
Pages: 425-428
Year: Issue:  10
Journal: Electroplating & Finishing

Keyword:  jacketmonoethylene glycolstorage tankcorrosion protectionthermal sprayed aluminumcoating defect;
Abstract: The requirement of surface treatment of thermal spraying aluminum process for lean glycol (MEG) storage tank in LW3-1 jacket legs and the factors influencing the quality of thermal sprayed aluminum were discussed. The quality problems existing in construction were summarized, including the peeling in weld bead, flaking-off of coating on annular plate, and poor adhesion. Some corresponding resolutions were presented: polishing the weld beads on annular plate and internal defects to eliminate the effect of passivation film and surface defect; sand blasting with No.16 alumina to increase the surface roughness;applying a high-power ventilator to decrease the effect of dust during construction;changing the spraying method;and enhancing the inspection of equipments and the training of workers. The thermal sprayed aluminum coating on MEG storage tank had a thickness ranging from 180 μm to 300 μm. The adhesion strength of the coating was higher than 7 MPa at single spot and 9 MPa averagely, indicating that the quality of thermal spayed aluminum was improved effectively.
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