CHEMICALS USED IN THE FLUSHING OF PIPELINES

CHEMICALS USED IN THE FLUSHING OF PIPELINES

Flushing of pipelines are very essential where pressure is been applied to empty a pipeline using appropriate chemicals to suspend, disperse and remove accumulated materials. After this process, the pipelines are given a final flush with clean water and chemical inhibitors are added to protect the pipelines.

Chemical flushing is been used in many industries today to eliminate debris, oil, grease, rust, scale, slug, accumulated materials that could be found or formed in the pipelines. Accumulated materials or deposits are sometimes called fouling, which needs to be removed time to time to prevent damage and maintain efficiency of operation .During chemical flushing thin layer of the inner surface of the pipe wall will remove as well as all the unnecessary contamination. Chemical cleaning is mostly required compared to the oil flushing because, chemical flushing will reduce the oil flushing cost in term of flushing time and number of oil flushing materials use such filter elements.

The usual chemical flushing involves

• Using of liquid drain opener (alkaline) as first degreaser to clean and dissolve all organic residue from the pipeline such as grease, fats and oil, where harder deposits have occurred

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• The second step involves following step one with a liquid drain opener (acid), for neutralizing the caustic remaining on the surfaces of the pipe or removing scale build-up. The acidic opener is used to removes mineral deposits in the pipelines, particularly in warm or hot fluid lines.

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•  Rust and scale remover is used afterwards to avoid and remove rust in the pipelines and also for a 
  maximum life span, efficiency and improve looks of metal pipeline. 

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• Neutralization as third stage, rinsing of the pipeline with demineralized water.

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• Application of Corrosion inhibitor as final stage for preventive measures on pipelines.

Note that temperature and chemical pH level must be carefully monitor and control in order to complete the process with high quality result.minimal mistake could lead to a lot of problem where the whole process may need to be carry out again which would consume time and resources.

Large volume of chemicals is required in flushing of any pipeline, regardless of diameter to be filled and circulated with, to achieve desired results. Special attention has to be paid to the velocity and volume calculations during the pre-engineering phase

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