| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.6 ( September 1982 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Performance of External Polyethylene Coating on Large Diameter Pipes in High Temperature Environments
Fuminori Mukaihara, Norio Kosuge, Tadanori Makino |
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Synopsis : In order to determine the maximum operating temperature of pipelines with external polyethylene(PE) coating, the durability of mechanical properties and water resistance of the coating were investigated over a temperature range from 20to 100. The results are summarized as follows: (1) High-density PE coating shows remarkably high penetration resistance up to 80. (2) The lifetime of the high density PE coating is estimated to be more than 40 years at 100 under dry conditions on the basis of Arrhenius plots of oxidative induction time and elongation at break. (3) When heat is transmitted from the steel pipe to PE coating during operation of pipelines, the high-density PE coating has sufficient anticorrosive properties for prolonged periods in hot water environment due to the low water permeability of the coating layer. |
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