Definition - What does Field Painting mean?
Field painting is the act of safeguarding structural steel and other materials that are prone to corrosion by applying a protective layer at the immediate site location where the material will be installed.
Corrosionpedia explains Field Painting
It is important to follow existing standards and practices when performing field painting. These standards determine factors such as outdoor temperature, indoor temperature, preparatory treatment, corrosivity classes and all other criteria that must be evaluated before field painting.
Understanding Corrosion in Pumps and How to Deal With It