This report provides the most current technology and industry practices for the internal in-situ cleaning and coating application in an existing steel pipeline. This report presents general practices and preferences in regard to the cleaning, surface preparation, drying, and the application of a coating in a steel pipeline by the pig (scraper) batching method. It is applicable to onshore or offshore steel pipelines in all industries including the oil and gas gathering, distribution, and transmission industries. It is also applicable to welded steel water and brine handling pipelines.