Abstract

Surajit Ghosal^1*, Rajib Dey¹ and Buddhadeb Duari²

DOI : http://dx.doi.org/10.13005/ojc/390203

Six polymeric coatings viz. 3LPE, 3p/2p CAT, PU, VE, LE and HSS have been selected and each type of coating has been applied separately on SS316L pipe external surface. The test samples have been subjected to adhesion tests by the peel strength and pull-off methods, before and after the Hot Water Immersion (HWI) test for 100 days. After completing the test, the peel strength values of 3LPE, 3p/2p CAT, VE, HSS are found about 10.9, 1.8, 0.35, 6.8 N/mm respectively, whereas the pull-off adhesion values of PU, LE are found about 10.77, 22.7 N/mm2 respectively. The experimental results are analysed, and the adhesion performances of the coatings are compared based on the dimensionless number termed as the “Coating Bond Index” in this study. The relative rankings of the adhesion performances for these coatings are evaluated in determining coatings suitability for buried SS316L pipelines in the petroleum, petrochemical and natural gas industries.

Adhesion performances; HWI test; Polymeric coatings; Peel strength and Pull-off methods; SS316L pipes

[ View HTML Full Text]