Calculating Velocity and Total Head Loss in Rising Main

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)

Answers:

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.

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