Pipes become rougher as they age. In some cases pipes become much rougher than
common literature recommendations for aged pipe. Age related changes in pipe
roughness are particularly important because of the ubiquity of iron based pipe. For this
study, it was found that the headloss due to friction in seven pipes ranging from 30 to 50
years old increased 200%-2400% as compared with the new condition. This unique set
of aged pipe friction data shows that Darcy's f for the tested aged pipes ranged from
0.06 to 0.22. A ratio of the effective aged pipe diameter to the new pipe diameter was
also calculated for each pipe. Plotting Darcy's f versus the diameter ratio revealed
correlation between the two terms. The seven aged pipes were chosen for testing
because they had visible age degradation and are not necessarily representative of
pipes in this age class. Includes 12 references, tables, figures.
| Edition : | Vol. - No. |
| Number of Pages : | 20 |
| Published : | 06/01/2007 |
