Using these maximum sizes, the friction loss in a pipe line, with carpet renovators in use exclusively, will be:
TABLE 19.
Friction Loss in Pipe Lines, with Carpet
Renovators in Use Exclusively.
| Number of Sweepers. | Friction Loss per 100 Feet, Inches. | |
|---|---|---|
| With 1-in. hose. | With 1¹⁄₄-in. hose. | |
| 1 | 0.20 | 0.06 |
| 2 | 0.30 | 0.20 |
| 3 | 0.24 | 0.17 |
| 4 | 0.19 | 0.13 |
| 5 | 0.30 | 0.22 |
| 6 | 0.24 | 0.17 |
These friction losses are figured with a density of air in the pipe equal to 6-in. vacuum in case of the 1¹⁄₄-in. hose and 10-in. vacuum in case of the 1-in. hose, which will be the density of the air entering the pipe, while the average density should be used in order to give correct results. If the pipe line is not over 400 ft. equivalent length the results will be approximately correct.
These results show, first, that the friction loss in pipe lines is much lower than that in the hose lines used with the same system; second, that the higher vacuum in the pipe causes greater loss, an argument in favor of the use of larger hose.
FIGS. 57-60. DIAGRAMS SHOWING OPERATION OF BRUSH AND CARPET RENOVATORS UNDER DIFFERENT CONDITIONS.