Computing Volume:
This chart is for computing cleaning
times on pipe cleaning.
Example: 500 ft of 10" sewer line 1/2 full of debris.
The chart says 27 cubic feet of debris per 100 foot of pipe.
5 x 27= 135 cubic feet of debris or 5 cubic yards of debris.
| PIPE | 1/4 Full | 1/4 Full | 1/4 Full | 1/2 Full | 1/2 Full | 1/2 Full | 3/4 Full | 3/4 Full | 3/4 Full | Full | Full | Full |
| SIZE | CF/LF | 100/LF | Yds/100ft | CF/LF | 100/LF | Yds/100ft | CF/LF | 100/LF | Yds/100ft | CF/LF | 100/LF | Yds/100ft |
| 8 | 0.03 | 0.30 | 0.01 | 0.17 | 17.00 | 0.63 | 0.28 | 28.00 | 1.04 | 0.35 | 35.00 | 1.30 |
| 10 | 0.05 | 5.00 | 0.19 | 0.27 | 27.00 | 1.00 | 0.40 | 40.00 | 1.48 | 0.54 | 54.00 | 2.00 |
| 12 | 0.07 | 7.00 | 0.26 | 0.40 | 40.00 | 1.48 | 0.50 | 50.00 | 1.85 | 0.79 | 79.00 | 2.93 |
| 15 | 0.15 | 15.00 | 0.56 | 0.50 | 50.00 | 1.85 | 0.98 | 98.00 | 3.63 | 1.20 | 120.00 | 4.44 |
| 18 | 0.20 | 20.00 | 0.74 | 0.90 | 90.00 | 3.33 | 1.45 | 145.00 | 5.37 | 1.80 | 180.00 | 6.67 |
| 21 | 0.25 | 25.00 | 0.93 | 1.10 | 110.00 | 4.07 | 1.80 | 180.00 | 6.67 | 2.20 | 220.00 | 8.15 |
| 24 | 0.35 | 35.00 | 1.30 | 1.50 | 150.00 | 5.56 | 2.50 | 250.00 | 9.26 | 3.10 | 310.00 | 11.48 |
| 27 | 0.45 | 45.00 | 1.67 | 1.90 | 190.00 | 7.04 | 3.10 | 310.00 | 11.48 | 3.70 | 370.00 | 13.70 |
| 30 | 0.60 | 60.00 | 2.22 | 2.50 | 250.00 | 9.26 | 4.00 | 400.00 | 14.81 | 4.90 | 490.00 | 18.15 |
| 36 | 0.85 | 85.00 | 3.15 | 3.80 | 380.00 | 14.07 | 5.80 | 580.00 | 21.48 | 7.10 | 710.00 | 26.30 |
| 42 | 1.20 | 120.00 | 4.44 | 4.90 | 490.00 | 18.15 | 7.90 | 790.00 | 29.26 | 9.70 | 970.00 | 35.93 |
| 48 | 1.60 | 160.00 | 5.93 | 6.50 | 650.00 | 24.07 | 10.50 | 1050.00 | 38.89 | 13.00 | 1300.00 | 48.15 |
| 54 | 2.00 | 200.00 | 7.41 | 8.00 | 800.00 | 29.63 | 13.00 | 1300.00 | 48.15 | 16.00 | 1600.00 | 59.26 |
| 60 | 2.50 | 250.00 | 9.26 | 10.00 | 1000.00 | 37.04 | 16.25 | 1625.00 | 60.19 | 20.00 | 2000.00 | 74.07 |
| 72 | 3.50 | 350.00 | 12.96 | 14.00 | 1400.00 | 51.85 | 22.25 | 2225.00 | 82.41 | 28.00 | 2800.00 | 103.70 |
| 84 | 4.80 | 480.00 | 17.78 | 19.50 | 1950.00 | 72.22 | 31.50 | 3150.00 | 116.67 | 39.00 | 3900.00 | 144.44 |
Evaluating Nozzles:
Nozzles perform one
of two basic functions-
- Cleaning debris off walls - A line with heavy grease requires a different nozzle than a line full of sugar sand.
- Moving debris down the line - How far does the debris move before it falls out of the nozzle flow?
Factors effecting performance-
- Angle of Jets - A nozzle with less angle will pull up the line better than a nozzle with high angle
- Number of Jets - Nozzles with 3 jets will leave stripes on the pipe walls when cleaning grease
- Placement of Jets - Is the nozzle stream clear of the nozzle shank and hose fitting?
- Size of Nozzle- weight does effect the speed the nozzle travels up the line
- Efficiency of Nozzle - How internal design effects flow of the water
Step Cleaning: Utilizing a method of taking small measured steps. This system is based on several basic assumptions.
- A nozzle can carry a given amount of material before it is overloaded and starts dropping material as it travels down the pipe. Example-A nozzle working at 2000 psi @ 35 gpm can carry approxmiately 1.5 to 2 cubic feet of material of debris in optmium conditions.
- Proper step size is important to consistent line cleaning.
- Taking a larger step than necessary creates several situations:
- Increases the potential for pushing water into a home
- Increased the chances of hanging up the hose in the line
- The operator loses some sense of what is going on in the line
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