This NACE standard test method was prepared as a guide for evaluating the application of polymeric coatings of less than 250 μm (10 mils) dry film thickness to the internal surfaces of metallic tubular goods used in the oil and gas industry. It is not intended to provide 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 TM01861 addresses holiday detection of internal tubular coatings of 250 to 760 μm (10 to 30 mils) dry film thickness.

This standard was originally prepared by NACE Task Group T-1G-9 on Holiday Testing of Plastic Linings, a component of Unit Committee T-1 G 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 Group Committee T-1 on Corrosion Control in Petroleum Production, a committee composed of representatives from the oil and gas industry, including producers, consumers, and interested individuals.

1.1 This NACE standard provides a nondestructive method for the detection of holidays in a nonconductive coating film that has been applied to the inner wall 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 less than 250 μm (10 mils) that have not been in service or previously tested for holidays with a salt solution. 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 of applied coating that exhibits electrical resistance of less than some specified value when that area is contacted with a wet sponge and detected with an appropriate instrument.

1 .4 The specified resistance for holiday detection is 80,000 ohms ±10% when measured between the wet probe sponge and the pipe substrate.

Historical Document 1994