APPENDIX A – Non-uniform Spatial Grid
Surge Analysis and the Wave Plan Method
Supplementary Material: Example Problems and Solutions
Appendix A – Problem 2
A.2 Repeat the above exercise with 100 mm and 3000 mm diameter pipes keeping the velocity range the same.
Solution:
- If the pipe is new and made of mild steel
100 mm diameter mild steel pipe
Hazen-William roughness coefficient for a new mild steel pipe is assumed to be 130.
For the generally accepted velocity range of 2 to 2.5 m/s, the length of the pipe section should be roughly 350 m (0.35 km) to produce a total friction headloss of 20m in a 100 mm diameter pipe.
3000 mm diameter mild steel pipe
Hazen-William roughness coefficient for a new mild steel pipe is assumed to be 130.
For the generally accepted velocity range of 2 to 2.5 m/s, the length of the pipe section should be roughly 17000 m (17 km) to produce a total friction headloss of 20m in a 3000 mm diameter pipe.
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