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
V = 1.9 m/sD = 75 mmν = 1.31 × 10⁻⁶ m²/s

Water at 10 °C (ν = 1.31 × 10⁻⁶ m²/s) flows at a mean velocity of 1.9 m/s through a pipe with an inside diameter of 75 mm. Find the Reynolds number Re.

V = 1.9 m/sD = 75 mmν = 1.31 × 10⁻⁶ m²/s
Re =
2.Easy
V = 2.5 m/sD = 100 mmν = 1.14 × 10⁻⁶ m²/s

Water at 15 °C (ν = 1.14 × 10⁻⁶ m²/s) flows at a mean velocity of 2.5 m/s through a pipe with an inside diameter of 100 mm. Find the Reynolds number Re.

V = 2.5 m/sD = 100 mmν = 1.14 × 10⁻⁶ m²/s
Re =
3.Medium
V = 1.6 m/sD = 100 mmL = 300 mf = 0.015

Water (ρ = 1000 kg/m³) flows at 1.6 m/s through a horizontal pipe, 300 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 = 1.6 m/sL = 300 mD = 100 mmf = 0.015ρ = 1000 kg/m³
Δp = kPa
4.Medium
Q = 40 L/sD = 300 mmL = 100 mf = 0.025

Water flows at 40 L/s through a pipe 100 m long with an inside diameter of 300 mm. Use the Darcy friction factor f = 0.025 and g = 9.81 m/s². Find the friction head loss hf.

Q = 40 L/sL = 100 mD = 300 mmf = 0.025g = 9.81 m/s²
hf = m
5.Hard
K = 5Δz = 14 mL = 300 m, D = 250 mm, f = 0.0153× bend (K = 0.3)

Two open reservoirs are joined by a pipe 300 m long with an inside diameter of 250 mm and a Darcy friction factor f = 0.015. The water surface of the upper reservoir is 14 m above that of the lower one. The minor losses are a square-edged entrance (K = 0.5), 3 bends (K = 0.3 each), a valve (K = 5) and the exit into the lower reservoir (K = 1.0). Use g = 9.81 m/s². Find the flow rate Q in L/s.

Δz = 14 mL = 300 mD = 250 mmf = 0.015Kentrance = 0.5Kbend = 0.3 (×3)Kvalve = 5Kexit = 1.0
Q = L/s
6.Hard
K = 10Δz = 39 mL = 150 m, D = 300 mm, f = 0.022× bend (K = 0.3)

Two open reservoirs are joined by a pipe 150 m long with an inside diameter of 300 mm and a Darcy friction factor f = 0.02. The water surface of the upper reservoir is 39 m above that of the lower one. The minor losses are a square-edged entrance (K = 0.5), 2 bends (K = 0.3 each), a valve (K = 10) and the exit into the lower reservoir (K = 1.0). Use g = 9.81 m/s². Find the flow rate Q in L/s.

Δz = 39 mL = 150 mD = 300 mmf = 0.02Kentrance = 0.5Kbend = 0.3 (×2)Kvalve = 10Kexit = 1.0
Q = L/s

Answer key

  1. 1. Re = 108779
  2. 2. Re = 219298
  3. 3. Δp = 57.6 kPa
  4. 4. hf = 0.136 m
  5. 5. Q = 161.4 L/s
  6. 6. Q = 415.9 L/s

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