The water used for pipeline flooding and hydro-testing testing has for some time been known as a potential source of microbial contamination, containing natural concentrations of SRB’s (Sulphate Reducing Bacteria), Acid Producing Bacteria and Planktonic Slime Forming Bacteria, that if left untreated, pose a range of negative consequences including:
Microbiological induced corrosion
Production of highly hazardous hydrogen sulphide gas H2S
Formation of biofilms and slime
Formation of Extracellular Polymeric Substances (EPS)
Damage of equipment and components (e.g. pumps, pipework)
UV disinfection: A highly effective solution for pipeline flooding water.
Traditionally, chemical biocides such as Glutaraldehyde and THPS have been used to prevent bacterial growth, however strict limitations on discharges to the environment of wastewater following completion, together with the high cost of chemical biocides have seen operators look for alternative water treatment solutions.
UV disinfection of fresh water, brackish water and seawater provides a highly effective, low cost alternative to chemical biocides for eliminating microorganisms and bacteria such as SRB’s. As a chemical-free technology, UV treatment has been successfully used in the field by leading operators on some of the worlds’ largest and most prestigious pipeline commissioning projects including the Nord Stream (Baltic Sea) and Castor (Caspian Sea) pipelines.
When using UV disinfection with a filtration package and food grade oxygen scavenger as the primary technique for controlling bacterial growth, operators have been able to fully eliminate the use of hazardous biocides from the process, significantly improving the environmental profile of the project and lowering operational costs.
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