APPENDIX A – Non-uniform Spatial Grid
Surge Analysis and the Wave Plan Method
Supplementary Material: Example Problems and Solutions
Appendix A – Problem 1
A.1 Define unit headloss in a pipeline. Tabulate (at least 10 rows) the velocity, unit headloss, and length of pipe that generates a total headloss of 20m within a 1000 mm internal diameter pipeline carrying a flowrate ranging from 10,000 lpm (liters per minute) through 150,000 lpm in 10,000 lpm increments for the following cases using suitable pipe frictional characteristics:
a. If the pipe is new and made of mild steel
b. If the pipe is 30 years old and made of mild steel
c. If the pipe is new and made of prestressed concrete
d. If the pipe is 30 years old and made of prestressed concrete
Solution:
a. If the pipe is new and made of mild steel
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 5000 m (5 km) to produce a total friction headloss of 20m within a 1000 mm diameter pipe.
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