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PE pipes head losses
PE is common pipe for drip irrigation systems and mini sprinklers systems.
Main usage of Low Density Polyethylene pipe is for online emitters laterals and small systems sub and main lines.
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External diameter | |||||
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Flow Rate |
12 mm |
16 mm |
20 mm |
25 mm |
32 mm |
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M3/H |
class 4 |
class 4 |
class 4 |
class 4 |
class 4 |
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0.10 |
0.035 |
0.017 |
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0.20 |
0.120 |
0.027 |
0.009 |
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0.30 |
0.250 |
0.056 |
0.017 |
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0.40 |
0.400 |
0.092 |
0.028 |
0.009 |
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0.50 |
0.600 |
0.131 |
0.042 |
0.013 |
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0.60 |
0.800 |
0.186 |
0.058 |
0.018 |
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0.70 |
0.240 |
0.075 |
0.024 |
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0.80 |
0.310 |
0.096 |
0.030 |
0.010 | |
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0.90 |
0.380 |
0.120 |
0.037 |
0.012 | |
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1.00 |
0.450 |
0.140 |
0.045 |
0.014 | |
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1.20 |
0.630 |
0.194 |
0.060 |
0.019 | |
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1.40 |
0.820 |
0.260 |
0.080 |
0.025 | |
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1.60 |
0.320 |
0.100 |
0.034 | ||
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1.80 |
0.100 |
0.120 |
0.038 | ||
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2.00 |
0.490 |
0.150 |
0.046 | ||
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2.25 |
0.600 |
0.180 |
0.056 | ||
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2.50 |
0.720 |
0.220 |
0.068 | ||
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2.75 |
0.850 |
0.260 |
0.080 | ||
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3.00 |
0.300 |
0.093 | |||
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3.50 |
0.400 |
0.120 | |||
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4.00 |
0.500 |
0.150 | |||
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5.00 |
0.750 |
0.230 | |||
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6.00 |
0.310 | ||||
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7.00 |
0.410 | ||||
Main usage of High Density Polyethylene pipes is for sub-main and main lines in irrigation systems.
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Flow Rate |
External diameter | ||||
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M3/H |
40 mm |
50 mm |
63 mm |
75 mm |
90 mm |
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class 4 |
class 4 |
class 4 |
class 4 |
class 4 |
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10.00 |
0.180 |
0.061 |
0.020 |
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15.00 |
2.000 |
0.041 |
0.017 |
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20.00 |
0.070 |
0.029 |
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25.00 |
0.105 |
0.044 |
0.010 | ||
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30.00 |
0.145 |
0.060 |
0.018 | ||
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35.00 |
0.190 |
0.079 |
0.024 | ||
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40.00 |
0.235 |
0.100 |
0.031 | ||
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50.00 |
0.150 |
0.046 | |||
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60.00 |
0.210 |
0.063 | |||
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70.00 |
0.084 | ||||
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80.00 |
0.105 | ||||
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90.00 |
0.130 | ||||
Head losses in multi branch outlet irrigation pipe
Calculate the theoretical head losses as the pipe have no outlets.
Than multiply the result with the appropriate coefficient from the following table.
There are 2 types of coefficients:
1st outlet distance is equal to all other outlets distances.
1st outlet distance is equal to the half of all other outlets distances.
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Number of outlets, N |
1st. outlet distance, equal distance outlets distances |
1st. outlet distance, is half of the outlets distances |
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1 |
1.000 |
1.000 |
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2 |
0.639 |
0.532 |
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3 |
0.535 |
0.455 |
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4 |
0.486 |
0.426 |
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5 |
0.457 |
0.410 |
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6 |
0.435 |
0.401 |
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7 |
0.425 |
0.395 |
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8 |
0.415 |
0.390 |
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9 |
0.409 |
0.387 |
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10 |
0.402 |
0.384 |
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12 |
0.394 |
0.380 |
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14 |
0.387 |
0.378 |
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16 |
0.382 |
0.376 |
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18 |
0.379 |
0.374 |
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20 |
0.376 |
0.373 |
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25 |
0.371 |
0.371 |
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30 |
0.368 |
0.370 |
Utility links:
Irrigation piping bsp and npt standarts
irrigation pe piping metric standarts