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Table 1

Velocity correction coefficients for type 1 pipes

Pipe wall roughness (mm)Nominal pipe diameter (mm)Initial pipe cross-section (mm2)Estimated pipe diameter in case of 1 mm roughness (mm)Corrected pipe cross-section (mm2)Velocity correction coefficient
1.46 100 7,853.98 97.6 7,481.51 1.05 
6.2 100 7,853.98 87.3 5,985.75 1.31 
22.6 100 7,853.98 75.8 4,512.62 1.74 
50 100 7,853.98 66.9 3,515.14 2.23 
100 100 7,853.98 57.1 2,560.72 3.07 
200 100 7,853.98 43.2 1,465.74 5.36 
Pipe wall roughness (mm)Nominal pipe diameter (mm)Initial pipe cross-section (mm2)Estimated pipe diameter in case of 1 mm roughness (mm)Corrected pipe cross-section (mm2)Velocity correction coefficient
1.46 100 7,853.98 97.6 7,481.51 1.05 
6.2 100 7,853.98 87.3 5,985.75 1.31 
22.6 100 7,853.98 75.8 4,512.62 1.74 
50 100 7,853.98 66.9 3,515.14 2.23 
100 100 7,853.98 57.1 2,560.72 3.07 
200 100 7,853.98 43.2 1,465.74 5.36 
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