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Hydraulics

Water Pipe Pressure Loss with Temperature

Enter values in the stated units. Example inputs are provided to help you explore the method.

Inputs

Results

Your results will appear here after calculation. Changing an input clears the previous result.

Method & assumptions

  1. Calculate pure-water density and viscosity from temperature and inlet pressure, then estimate straight horizontal pipe friction. Liquid-water range: 0.01–110 °C and saturation pressure through 300000 Pa absolute.
  2. IAPWS SR6-08(2011) supplies temperature-dependent water properties with limited-pressure corrections. Properties are held at their inlet values along this constant-diameter, isothermal pipe.
  3. Velocity = 4Q/(πD²), Re = ρvD/μ. Darcy f = 64/Re below Re 2300, otherwise the Swamee–Jain approximation. The transitional range 2300–4000 is flagged as uncertain; EPANET transitional interpolation is not implemented. Q = 0 gives zero loss.
  4. ΔP = f(L/D)ρv²/2; head loss = ΔP/(ρg), g = 9.80665 m/s². Outlet pressure = inlet pressure − ΔP. Reject a predicted outlet pressure below saturation rather than applying a single-phase result there.
  5. No fittings, valves, elevation change, pump, developing-flow correction, water hammer or heat transfer. Use actual internal diameter and a documented roughness; defaults are illustrative. A passing saturation check is not a cavitation assessment of other system components.

Sources