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 = 6 L/sD = 100 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 100 mm at 6 L/s. Find the Reynolds number Re.

Q = 6 L/sD = 100 mmν = 1.31 × 10⁻⁶ m²/s
Re =
2.Easy
V = 0.5 m/sD = 25 mmν = 0.801 × 10⁻⁶ m²/s

Water at 30 °C (ν = 0.801 × 10⁻⁶ m²/s) flows at a mean velocity of 0.5 m/s through a pipe with an inside diameter of 25 mm. Find the Reynolds number Re.

V = 0.5 m/sD = 25 mmν = 0.801 × 10⁻⁶ m²/s
Re =
3.Medium
V = 2.5 m/sD = 100 mmL = 50 mf = 0.015

Water (ρ = 1000 kg/m³) flows at 2.5 m/s through a horizontal pipe, 50 m long, with an inside diameter of 100 mm. Use the Darcy friction factor f = 0.015 and g = 9.81 m/s². Find the pressure drop Δp over the pipe in kPa.

V = 2.5 m/sL = 50 mD = 100 mmf = 0.015ρ = 1000 kg/m³
Δp = kPa
4.Medium
V = 2.1 m/sD = 200 mmL = 300 mf = 0.018

Water flows at a mean velocity of 2.1 m/s through a pipe 300 m long with an inside diameter of 200 mm. Use the Darcy friction factor f = 0.018 and g = 9.81 m/s². Find the friction head loss hf.

V = 2.1 m/sL = 300 mD = 200 mmf = 0.018g = 9.81 m/s²
hf = m
5.Hard
K = 10free outletH = ?L = 100 m, D = 150 mm, f = 0.0222× bend (K = 0.3)

A pipe 100 m long with an inside diameter of 150 mm (Darcy friction factor f = 0.022) 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), 2 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 25 L/s?

Q = 25 L/sL = 100 mD = 150 mmf = 0.022Kentrance = 0.5Kbend = 0.3 (×2)Kvalve = 10
H = m
6.Hard
K = 0.2free outletH = ?L = 150 m, D = 300 mm, f = 0.023× bend (K = 0.3)

A pipe 150 m long with an inside diameter of 300 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 = 0.2). Use g = 9.81 m/s². How far H must the reservoir surface be above the pipe outlet for a flow rate of 100 L/s?

Q = 100 L/sL = 150 mD = 300 mmf = 0.02Kentrance = 0.5Kbend = 0.3 (×3)Kvalve = 0.2
H = m

Answer key

  1. 1. Re = 58316
  2. 2. Re = 15605
  3. 3. Δp = 23.44 kPa
  4. 4. hf = 6.069 m
  5. 5. H = 2.73 m
  6. 6. H = 1.285 m

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