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The pressure loss in corrugated hoses in 100% higher than in new welded steel pipes, because the bore of a corrugated hose is not smooth. This means that in the case of corrugated hoses an increase in diameter of 15% is required to reduce the pressure loss to the value of the pressure loss in steel pipes.
The chart shows the approximate pressure drop for each size of corrugated hose related to a flw rate where water is the fluid. The utilize the chart, read off on the base line the flow rate required. Where vertical line from the selected point on the base line intersects the nominal bore line, the pressure drop is shown on the vertical axis, corresponding the the point inter section.