Pipe friction & head loss worksheet with answers

Free printable Pipe friction & head loss worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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1.Easy
Q = 15 L/sD = 75 mmν = 1.31 × 10⁻⁶ m²/s

Water at 10 °C (ν = 1.31 × 10⁻⁶ m²/s) flows through a pipe with an inside diameter of 75 mm at 15 L/s. Find the Reynolds number Re.

Q = 15 L/sD = 75 mmν = 1.31 × 10⁻⁶ m²/s
Re =
2.Easy
Q = 20 L/sD = 100 mmν = 1.00 × 10⁻⁶ m²/s

Water at 20 °C (ν = 1.00 × 10⁻⁶ m²/s) flows through a pipe with an inside diameter of 100 mm at 20 L/s. Find the Reynolds number Re.

Q = 20 L/sD = 100 mmν = 1.00 × 10⁻⁶ m²/s
Re =
3.Medium
V = 1.1 m/sD = 200 mmL = 300 mf = 0.025

Water flows at a mean velocity of 1.1 m/s through a pipe 300 m long with an inside diameter of 200 mm. Use the Darcy friction factor f = 0.025 and g = 9.81 m/s². Find the friction head loss hf.

V = 1.1 m/sL = 300 mD = 200 mmf = 0.025g = 9.81 m/s²
hf = m
4.Medium
Q = 12 L/sD = 75 mmL = 800 mf = 0.03

Water flows at 12 L/s through a pipe 800 m long with an inside diameter of 75 mm. Use the Darcy friction factor f = 0.03 and g = 9.81 m/s². Find the friction head loss hf.

Q = 12 L/sL = 800 mD = 75 mmf = 0.03g = 9.81 m/s²
hf = m
5.Hard
K = 10free outletH = ?L = 100 m, D = 250 mm, f = 0.0154× bend (K = 0.3)

A pipe 100 m long with an inside diameter of 250 mm (Darcy friction factor f = 0.015) runs from an open reservoir and discharges as a free jet into the air. The minor losses are a square-edged entrance (K = 0.5), 4 bends (K = 0.3 each) and a valve (K = 10). Use g = 9.81 m/s². How far H must the reservoir surface be above the pipe outlet for a flow rate of 150 L/s?

Q = 150 L/sL = 100 mD = 250 mmf = 0.015Kentrance = 0.5Kbend = 0.3 (×4)Kvalve = 10
H = m
6.Hard
K = 2free outletH = ?L = 100 m, D = 150 mm, f = 0.023× bend (K = 0.3)

A pipe 100 m long with an inside diameter of 150 mm (Darcy friction factor f = 0.02) runs from an open reservoir and discharges as a free jet into the air. The minor losses are a square-edged entrance (K = 0.5), 3 bends (K = 0.3 each) and a valve (K = 2). Use g = 9.81 m/s². How far H must the reservoir surface be above the pipe outlet for a flow rate of 30 L/s?

Q = 30 L/sL = 100 mD = 150 mmf = 0.02Kentrance = 0.5Kbend = 0.3 (×3)Kvalve = 2
H = m

Answer key

  1. 1. Re = 194388
  2. 2. Re = 254648
  3. 3. hf = 2.313 m
  4. 4. hf = 120.3 m
  5. 5. H = 8.9 m
  6. 6. H = 2.605 m

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