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Piping pressure calculation

Hazen–Williams equation
Hf=5.4755×103・C1.85・D4.87・Q1.85・L

C:  Flow rate factor
D: Inside pipe diameter (m)
Q: Flow volume (m3/min)
L: Pipe length (m)

Hf=10.666×C-1.85・D-4.87・Q1.85・L

Or,
C: Flow rate factor
D: Inside pipe diameter (m)
Q: Flow volume (m3/min)
L: Pipe length (m)

is displayed as shown.

Pipe conditions & the value of C
Pipe type C
New-mint iron pipe 130
Old cast iron pipe 100
New steel pipe 120~130
Old steel pipe 80~100

Please calculate lining pipes, concrete pipes, PVC pipes, and other pipes with a good internal degree of roughness as C=130 (or 140).

Equivalent length of straight pipe fittings and valves
Name Joint Shape Pipe diameter (Upper level B) (Lower level mm)
1 2 3 4 5 6 8 10 12 14
25 32 40 50 65 80 100 125 150 200 250 300 350
90°
Short elbow
Screw 1.6 2.0 2.3 2.6 2.9 3.4 4.0            
Flange 0.5 0.6 0.7 0.9 1.1 1.3 1.8 2.2 2.7 3.7 4.3 5.2 5.5
90
Long elbow
Screw 0.8 1.0 1.0 1.1 1.1 1.2 1.4            
Flange 0.5 0.6 0.7 0.8 0.9 1.0 1.3 1.5 1.7 2.1 2.4 2.7 2.9
45°
Elbow
Screw 0.4 0.5 0.7 0.8 1.0 1.2 1.7            
Flange 0.3 0.4 0.4 0.5 0.6 0.8 1.1 1.4 1.7 2.4 2.7 3.3 4.0
Cheese (Main) Screw 1.0 1.4 1.7 2.4 2.8 3.7 5.0            
Flange 0.3 0.4 0.5 0.6 0.6 0.7 0.9 1.0 1.2 1.4 1.6 1.8 2.0
Cheese (Branch) Screw 2.0 2.8 3.0 3.7 4.0 5.2 6.4            
Flange 1.0 1.3 1.6 2.0 2.3 2.9 3.7 4.6 5.5 7.3 9.1 10.3 11.2
180°
Bend
Screw 1.6 2.0 2.3 2.6 2.8 3.4 4.0            
Flange 0.5 0.6 0.7 0.9 1.1 1.3 1.8 2.2 2.7 3.8 4.3 5.2 5.6
Spherical valve Screw 8.8 11.3 12.8 16.5 18.9 24.1 33.5            
Flange 13.7 16.5 18.0 21.3 23.5 28.6 36.5 45.6 57.8 79.1 94.5    
Sluice valve Screw 0.3 0.3 0.4 0.5 0.5 0.6 0.8            
Flange       0.8 0.8 0.9 0.9 1.0 1.0 1.0 1.0 1.0 1.0
Check valve Screw 3.4 4.0 4.6 5.8 6.7 8.2 11.6            
Flange 2.2 3.1 3.7 5.2 6.4 8.2 11.6 15.2 19.2 27.4 36.6 42.7  
Angle valve Screw 5.2 5.5 5.5 5.5 5.5 5.5 5.5            
Flange 5.2 5.5 5.5 6.4 6.7 8.5 11.6 15.2 19.2 27.4 36.6 42.6 48.7
Secular changes in old cast iron pipes

Secular changes in old cast iron pipes

Hazen-Williams equation

Piping pressure

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