scope:

General

In AMPP standards, the terms shall and must are used to state requirements and are considered mandatory. The term should is used to state something that is recommended, but is not considered mandatory. The term may is used to state something considered optional.

This test method describes an accelerated test procedure for determining comparative resistance to cathodic disbondment of protective coating systems applied to the exterior of steel pipes and structures that are buried in soil or submerged. This test method is intended for use with specimens of coated tube, a specimen cut from a section of coated pipe, or flat coated steel plates.

This test method also is applicable to tank linings with an internal cathodic protection system.

This test method is not intended for tape or sleeve coatings with a soft adhesive that may flow at the test temperature.

This test method is intended to cover all service temperatures from ambient to elevated temperatures.

The test results obtained in this method will serve as a ranking of the candidate coating systems in their cathodic disbondment resistance at different service temperatures. This standard test method is not intended to simulate field conditions or predict service life.

There are many test parameters that may affect the cathodic disbondment test results. This test method has taken all test parameters into consideration, and all the test parameters shall not be modified to satisfactorily meet the requirements of this standard.