The activities of microbes found in piping and geologic structures are known to produce iron sulfides and pipe corrosion. The most common microbes to be found in gas pipelines that can produce iron sulfides are:
(1) Desulfovibriodesulfuricans (sulfur producing)
(2) Clostridium (acid producing bacteria).
The viability of microbes to corrode piping interior surfaces depends upon the same source materials as sulfide chemical corrosion, that is, water and iron. Furthermore, the microbes depend upon short-chain volatile fatty acids (VFA) as a nutrient source. These are nearly always found where water exists in a closed piping environment.