# Head Loss Calculation in Cast Iron Pipe

## What is the head loss due to friction in a 720 m long cast iron pipe with a diameter of 200 mm and a flow velocity of 2 m/s?

Is the Hazen-Williams formula commonly used for calculating head loss in pipes?

## Head Loss Calculation in Cast Iron Pipe

The head loss due to friction in a 720 m long cast iron pipe with a diameter of 200 mm and a flow velocity of 2 m/s is 7.925 meters. This value was obtained using the Hazen-Williams formula.

## Utilization of the Hazen-Williams Formula

Yes, the Hazen-Williams formula is widely used for calculating head loss due to friction in pipes. It is based on the assumption of fully turbulent flow and takes into account the Hazen-Williams coefficient to represent the roughness of the pipe.

The Hazen-Williams formula is a commonly used method for determining head loss due to friction in pipes. It is represented by the equation:

**hL = 10.67 × L × Q^1.85/C^1.85 × D^4.87**

Where:

**hL = head loss due to friction (m)**

**L = length of pipe (m)**

**Q = flow rate of water (m^3/s)**

**C = Hazen-Williams coefficient**

**D = diameter of the pipe (m)**

In this case, with a pipe length of 720 m, a diameter of 200 mm, and a flow velocity of 2 m/s, the head loss due to friction was calculated as 7.925 meters using the given formula. The Hazen-Williams coefficient for cast iron pipes is approximately 120.85.