Considerations in the Hydraulic Design of Pipelines

Abstract

When the biofilm resistance model (BRM) is applied for Option 3 biofouling, the roughness is calculated for the recorded flow rate and energy loss for the diameter of the pipe equal to the original diameter minus 2 times t b. Figure i reflects the different data sets for the field measurements conducted on the Blyde (LBIS) pipeline and the Inyaka (Bushbuckridge) pipeline, showing how the assumed biofilm thickness will change the representative roughness. In Figure ii the range for the vertical axis for the a biofilm thickness varying between 7 and 13 mm in the Blyde pipeline and 14 to 18 mm in the Inyaka pipeline is shown in the shaded boxes.

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