HOW TO USE THE MONOGRAM FOR FRICTION -LOSS IN RIGID PVC WATER PIPES 

 

 

*Formula i = 9.3 x 107 Q1.76 / D4.76
  Where i = Loss of Head in Mtrs.
   per thousand Mtrs.
D = INSIDE Diameter of
   of Pipe in mm
v = Velocity in Mtrs./Sec. Q = Rate of flow
   in Cubic meter per hour.

 

 

 

 

 

 

 

                                 

Example      = For a required  flow of 13

                   m3/Hr.what will be frictional head loss 70 mm I.D pipe ?

                   Using a ruler connect values of flow rate and pipe  I.D
                   and read the value on scale i.

                   The Frictional head loss is 14.0 Mtrs./sec.which is well
                   within the permissible limit.

 

 

The values in this graph are based upon the Williams & Hazen formula*

 

 

 

 

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