Epoxy paints can protect the inner surface of pipes from corrosion. Mostly oil, patrol, gas lines etc. It is useful for.
Our experience is in the below standards.
INTERNAL COATING STANDARDS (LINING)
SURFACE PREPARATION     : ISO 8501 – 1, ISO 8501 – 2, ISO 8501 – 3
EPOXY LINING                      : EN 10289, AWWA C210, NFA 49709, 
FUSION BONDED EPOXY    : AWWA C213