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Backwash head loss in Pluvitec Master pipesCircular weirAtmospheric pressure given altitudeFair-Whipple-Hsiao equationAir specific massDynamic viscosity of atmospheric air

Hazen-Williams equation head loss

Input data

Diameter

Flow

Length

Hazen-Williams constant (C)

Output data

Head loss

Description

Performs hydraulic calculations using Hazen-Williams formula

hf=10.643(QC)1.85LD4.87\begin{equation*} h_f = 10.643 \left(\frac{Q}{C}\right)^{1.85}\frac{L}{D^{4.87}} \end{equation*}

There are 5 options:

  1. Calculates the head loss
  2. Calculates the pipe extension
  3. Calculates the flow
  4. Calculates the diameter
  5. Calculates the Hazen-Williams C factor

Head loss calculations using the Hazen-Williams equationHead loss calculations using the Hazen-Williams equation

Material
Minimum CC
Maximum CC
Average CC
Aluminum
130
150
140
Asbestos Cement
140
140
140
Asphalt Lining
130
140
135
Brass
130
140
135
Brick sewer
90
100
95
Cast-Iron - new unlined (CIP)
130
130
130
Cast-Iron 10 years old
107
113
110
Cast-Iron 20 years old
89
100
94.5
Cast-Iron 30 years old
5
90
47.5
Cast-Iron 40 years old
64
83
73.5
Cast-Iron, asphalt coated
100
100
100
Cast-Iron, cement lined
140
140
140
Cast-Iron, bituminous lined
140
140
140
Cast-Iron, sea-coated
120
120
120
Cast-Iron, wrought plain
100
100
100
Cement lining
130
140
135
Concrete
100
140
120
Concrete lined, steel forms
140
140
140
Concrete lined, wooden forms
120
120
120
Concrete, old
100
110
105
Copper
130
140
135
Corrugated Metal
60
60
60
Ductile Iron Pipe (DIP)
140
140
140
Ductile Iron, cement lined
120
120
120
Fiber
140
140
140
Fiber Glass Pipe - FRP
150
150
150
Galvanized iron
120
120
120
Glass
130
130
130
Lead
130
140
135
Metal Pipes - Very to extremely smooth
130
140
135
Plastic
130
150
140
Polyethylene, PE, PEH
140
140
140
Polyvinyl chloride, PVC, CPVC
150
150
150
Smooth Pipes
140
140
140
Steel new unlined
140
150
145
Steel, corrugated
60
60
60
Steel, interior riveted, no projecting rivets
110
110
110
Steel, projecting girth and horizontal rivets
100
100
100
Steel, vitrified, spiral-riveted
90
110
100
Steel, welded and seamless
100
100
100
Tin
130
130
130
Vitrified Clay
110
110
110
Wrought iron, plain
100
100
100
Wooden or Masonry Pipe - Smooth
120
120
120
Wood Stave
110
120
115

Data extracted from: https://www.engineeringtoolbox.com/hazen-williams-coefficients-d_798.html. (Last seen at 08/28/2023)

References

  • Fonte: AZEVEDO NETTO, J. M. de; FERNANDEZ Y FERNANDEZ, Miguel. Manual de hidráulica, 9.ed. São Paulo: Blucher, 2015.