This NACE standard test metbod was prepared as a guide for evaluating the application of polymeric coatings of 250 to 760 μm (1 O to 30 mils) to the internal surfaces of metallic tubular goods used in the oil and gas industry. It is not intended as a means of predicting the service life or service performance of these coatings. This test method is based on the current technology and experience of the petroleum production industry. NACE Standard TM0384(1l addresses holiday detection of internal tubular coatings of less than 250 μm (10 mils) dry film thickness.

This NACE standard was originally prepared by Task Group T-1G-9 on Holiday Testing of Plastic Linings, a component of Unit Committee T-1G on Protective Coatings, Elastomers, and other Nonmetallic Materials for Oilfield Use, and was reaffirmed by T-1G in 1989 and 1994. It is issued by NACE International under the auspices of NACE Group Committee T-1 on Corrosion Control in Petroleum Production, which is composed of representatives from the oil and gas industry including consumers, producers, and interested individuals.

1.1 This NACE standard provides a nondestructive test method for the detection of holidays in a nonconductive coating film that has been applied to the inner wall (bore) of oilfield tubular goods. The apparatus and the recommended procedure for conducting the test are described, as are methods of reporting the test data.

1.2 The test method applies to coatings that have a dry film thickness of 250 to 760 μm (10 to 30 mils) that have not been in service or previously tested. When holiday testing is performed on coatings that have been in service or that have been previously tested for holidays with a salt solution, there is a possibility of misleading results arising from surface contamination or salt bridging. The coating surface shall be free of materials that give added electrical insulation or that can mechanically damage the coating during the test.

1.3 A "holiday" is defined as any discontinuity or bare spot in a coated surface. For this test method, it means an area in an applied nonconductive coating that exhibits electrical conductivity when exposed to a known impressed voltage.

1.4 The voltage range for holiday detection is 4 to 12 V (DC) per μm (100 to 300 V [DC] per mil) of dry film thickness. The test voltage is determined by the type of probe, the maximum specified dry film thickness, applicable coating application, and the customer. The voltage shall be measured between the probe and the pipe.