The history of wax coating and wrapper systems antedates 1940. Until now, however, no standard has been developed specifically for the application and use of these materials as protective systems for pipelines.

This recommended practice has been issued as a standard for wax-type protective coatings and wrappers for underground pipelines by NACE Group Committee T-10 (Underground Corrosion Control). The document was prepared by NACE Task Group T-10D-6 (Wax Coatings) of NACE Unit Committee T-10D (Protective Coating Systems). It covers the various wax-type materials used in the protection of underground piping structures for industry.

This recommended practice discusses both hot- and cold applied wax coatings and component wrappers as coatings systems for the protection of underground piping. It also suggests proper methods of obtaining surface preparation, coating application, handling, storage, and installation of the coated piping.

Tables 1 through 5 indicate requirements and test methods for the various materials discussed in this text.

This standard supersedes NACE publication 2L 161, Tentative Recommended Minimum Requirements for Hot-Applied Wax-Type Protective Coatings and Wrappers for Underground Pipelines.

1.1 This recommended practice covers both hot- and cold-applied wax coatings and component wrappers as coatings systems for the protection of underground piping.

1.2 The use of wax coating and wrapper systems for underground piping provides a pipe surface continuously coated with wax coating, over-wrapped with a component wrapper. Such systems are designed to provide protection for pipeline against a corrosive environment.

1.3. Some material requirements are delineated for primer, wax coating material, wrapper, outer coating, and out wrap.

1.4 Wax coatings may be applied by machine, either in the field as a travel-line operation, or in a coating applicator mill, or by hand, as required.

1.5 This recommended practice also indicates proper methods of surface preparation, coating application, handling, storage, and installation of the coated piping.

Historical Document 1975