Drag reduction phenomenon in pipelines has received lots of attention during the past decades due to its potential engineering applications

especially in fluid transporting industries. Various methods to enhance drag reduction have been developed throughout the years and divided into two categories; non-additives method and additives method. Both categories have different types of methods

with different formulations and applications which will generally be discussed in this review. Among all the methods discussed

drag reduction using polymer additive is as one of the most enticing and desirable methods. It has been the subject of research in this field and has been studied extensively for quite some time. It is due to its ability to reduce drag up to 80% when added in minute concentrations. Reducing drag in the pipe will require less pumping power thus offering economic relieves to the industries. So

this paper will be focusing more on the use of polymer additives as drag reducing agent

the general formulations of the additives

major issues involving the use of drag reducing polymers

and the potential applications of it. However

despite the extensive works of drag reduction polymer

there are still no models that accurately explain the mechanism of drag reduction. More studies needed to be done to have a better understanding of the phenomenon. Therefore

future research areas and potential approaches are proposed for future work.