51313-02175-Compatibility Between Pipeline Anticorrosion Coating and Thermal Insulator in the Presence of CP

Available for download

Product Number: 51313-02175-SG

ISBN: 02175 2013 CP

Author: Sankara Papavinasam

Publication Date: 2013

Member Price: $0.00

Non Member Price: $20.00

Price: $20.00

Qty:

Due to operational requirements including the production of heavy oil from oil-sands by the Steam-Assisted Gravitational Drainage (SAGD) process the operating temperature of pipelines is increasing. Pipelines are being operated at temperatures as high as 150oC. To maintain such temperatures the external surface of the pipeline is protected by an insulator in addition to an anti-corrosion coating. All underground pipelines are further protected by cathodic protection (CP). The cathodic disbondment (CD) test is commonly used for determining compatibility between external polymeric pipeline coatings and CP. This test measures the coating disbondment caused by electrical stress. The influence of various factors affecting cathodic disbondment of anticorrosion coating in the presence of insulator was previously investigated at 150oC by drilling a holiday through the insulator to expose the steel surface.

In this paper the disbondment characteristics of anti-corrosion coating below an intact insulator at 150oC has been investigated using a specially designed titled pipe sample. During the long-term experiment the corrosion potential at various points of the pipe sample cathodic current demand and infrared temperature photo were recorded. The cathodic disbondment area measured after the test has been correlated with these online measurements recorded during the test.