Calculating Velocity and Total Head Loss in Rising Main

02 Nov 2023

Questions:

1. What is the actual velocity if ID is 150mm?

2. What is the total head loss in rising main due to friction? (Ignoring local losses)

1. The actual velocity when the diameter is 150 mm can be calculated as follows:

2. The total head loss due to friction in the rising main can be calculated using the following formula:

1. To find the actual velocity when the diameter is 150 mm, we use the formula:

Velocity = (4 x Flow Rate) / (π x Diameter² x 3600)

Plugging in the known values:

Velocity = (4 × 9.84) / (π × (0.15)² × 3600)

Velocity = 0.895 m/s

Therefore, the actual velocity of the fluid is 0.895 m/s.

2. The total head loss due to friction in the rising main can be calculated using the formula:

Total head loss (hf) = f(L/D)(v²/2g)

Substitute the values in the formula:

Total head loss (hf) = 0.0196(240/0.15)(0.895²/2 x 9.81)

Total head loss (hf) = 26.41 m

Therefore, the total head loss due to friction is 26.41 m.