scope:

This standard describes the special protective interior coatings for valves and hydrants used for water supply service. The standard describes the material, application, and performance requirements for these special interior coatings. The coating shall be either a liquid or powder system and shall not contain coal tar. These coatings are applied to interior ferrous surfaces of valves and hydrants where corrosion protection is specified.

Exceptions.

This standard does not cover the following:

Exterior coatings.

It is normal commercial practice for the coating applicator to apply this coating to the exterior surface of resilient seat gate valves. It should be recognized that the performance requirements for exterior service may vary from those specified for interior use because of differences in exposure conditions.

Special service conditions.

Coatings agreed on between the purchaser and the manufacturer for special service conditions, including salt water, acid, and high temperature.