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For pipe installed through bore methods, visual inspections and electronic coating holiday detectors during installation becomes impractical. This paper/presentation will discuss the steps we took as a pipeline operator to find a practical approach to performing a coating quality test on bored pipe.
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An alternative method to record the potential shift when performing a coating conductance test outlined in NACE TM0102-021 is proposed. This method utilizes an oscilloscope rather than a digital multimeter to capture the potential shift when performing the applied current method.
This standard covers internal tubular polymeric coatings on a steel pipe/piping substrate. The standard defines and provides a procedure for the determination of the presence of holidays in a thick-film coating. This test method is based on the current technology and experience of the petroleum production industry This standard is intended for end users, manufacturers, applicators, corrosion engineers, and quality inspectors of internally coated metallic tubular goods.
This nondestructive test method describes a procedure to detect discontinuities (“holidays”) in thin-film polymeric coatings of less than 330 µm (13 mils) dry film thickness (DFT) applied to the internal surfaces of metallic tubular goods used in the oil and gas industry. The apparatus and the recommended procedure for performing the test are described, as are methods of reporting the test data.
A separate test method, NACE TM0186, addresses holiday detection of internal tubular good coatings of 330 to 760 µm (13 to 30 mils) dry-film thickness.