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HEAD LOSSES IN ORDINARY WATER PIPES :
 
Figures indicate head in metres per 100 meters of straight pipes
Quantity of Water Head Losses in Ordinary Water Pipes
m³/h Liters/min Liters/sec Nominal Pipe Diameter in Inches and Internal Diameter in (mm.)

½"

15.75

¾"

21.25

1.00

27.00

1¼"

35.75

1½"

41.25

2"

52.50

2½"

68.00

3"

80.25

3½"

92.50

4"

105.0

5"

130.0

6"

155.5
0.6 10 0.16 9.91 2.41                    
0.9 15 0.25 20.11 4.86 1.57 0.42                
1.2 20 0.33 33.53 8.04 2.59 0.68 0.35              
1.5 25 0.42 49.93 11.91 3.83 1.00 0.51              
1.8 30 0.50 69.34 16.50 5.28 1.38 0.70 0.22            
2.1 35 0.58 91.54 21.75 6.95 1.81 0.91 0.29            
2.4 40 0.67   27.66 8.82 2.29 1.16 0.37            
3.0 50 0.83   41.40 13.14 3.40 1.72 0.54 0.16          
3.6 60 1.00   57.74 18.28 4.72 2.38 0.75 0.22          
4.2 70 1.12   76.49 24.18 6.23 3.13 0.99 0.29 0.13        
4.8 80 1.33     30.87 7.94 3.99 1.25 0.36 6.16        
5.4 90 1.50     38.30 9.83 4.93 1.55 0.45 0.20        
6.0 100 1.67     46.49 11.90 5.97 1.88 0.54 0.24 0.12      
7.5 125 2.08     70.41 17.93 8.97 2.80 0.81 0.37 0.19 0.10    
9.0 150 2.50       25.11 12.53 3.90 1.12 0.51 0.26 0.14    
10.5 175 2.92       33.32 16.66 5.18 1.49 0.67 0.34 0.18    
12 200 3.33       42.75 21.36 6.62 1.90 0.86 0.43 0.23 0.08  
15 250 4.17       64.86 32.32 10.03 2.86 1.28 0.65 0.35 0.13  
18 300 5.00         45.52 14.04 4.01 1.79 0.90 0.49 0.18 0.07
24 400 6.67         78.17 24.04 6.83 3.05 1.53 0.83 0.29 0.12
30 500 8.33           36.71 10.40 4.62 2.32 1.25 0.45 0.19
36 600 10.0           51.84 14.62 6.51 3.26 1.76 0.62 0.26
42 700 11.7             19.52 8.69 4.36 2.35 0.83 0.35
48 800 13.3             25.20 11.18 5.58 3.01 1.07 0.45
54 900 15.0             31.51 13.97 6.98 3.76 1.33 0.56
60 1,000 16.7             38.43 17.06 8.52 4.60 1.62 0.67
75 1,250 20.8               26.10 13.00 7.01 2.46 1.03
90 1,500 25.0               36.97 18.42 9.89 3.46 1.44
105 1,750 29.2                 24.76 13.30 3.47 1.93
120 2,000 33.3                 31.94 17.16 4.67 2.50
150 2,500 41.7                   26.26 6.00 3.81
180 3,000 50.0                     9.22 5.42
240 4,000 66.7                     13.05 8.93
300 5,000 83.3                     22.72 14.42
90°C bends slide valves 1.00 1.00 1.10 1.20 1.30 1.40 1.50 1.60 1.60 1.60 1.70 2.50
T-pieces non-return valves 4.00 4.00 4.00 5.00 5.00 5.00 6.00 6.00 6.00 6.00 7.00 9.00
 

The table is calculated in accordance with H.Lang's new formula a=0.02 and for a water temperature of 10°C

The head loss in bends, slide, valves, T-Pieces and non-return valves is ecuvate it.