Velocity is the cross-sectional average for steady incompressible flow in one completely liquid-filled circular pipe. Calculations use actual inside diameter. US mode uses US gallons; metric mode uses litres and SI dimensions. Conversion basis: 1 US gal = 0.003785411784 m³; 1 in = 0.0254 m; 1 ft = 0.3048 m. Calculations retain full precision; displays are rounded.

Optional checks use Re = ρvD / μ and pipe volume = A × length. The flow-regime labels use approximate boundaries of Re < 2,300 (laminar), 2,300–4,000 (transitional), and > 4,000 (turbulent). These approximate regime boundaries follow Caleffi’s flow-regime explanation. A turbulent estimate is not proof of cleaning effectiveness. The main calculator evaluates one pipe segment. The independent design toolkit adds an estimated pressure duty and assigned branch-flow examples; pump capability, pressure-balanced branch distribution, spray coverage and partly filled return flow still require separate assessment.

The temperature demo uses an exchanger energy balance with water-like density 998 kg/m³ and specific heat 4.18 kJ/(kg·K). The valve is limited to 2,000 kg/h; assumed steam latent heat is 2,100 kJ/kg with 90% delivered efficiency. The heat balance follows the approach described in Spirax Sarco’s heat-load and steam-load explanation. The illustrative PID includes flow feed-forward, derivative filtering, output limits, and conditional integration to limit windup (see MathWorks’ anti-windup explanation). These are demonstration assumptions and gains, not a steam-property calculation, pump curve, heat-exchanger rating, or field controller tune. The circuit return is a delayed supply reading minus 3°C (floor 20°C). Return flow contributes to the wash tank energy balance only while the recovery valve is open, using its additional travel time to the tank. The wash tank begins at 45°C with a fixed 250 US gal (946.35 L) working volume and a 0.15 kW/K heat-loss coefficient to 20°C ambient. Its thermal balance is C_tank dT/dt = ṁ c_p(T_return − T_tank) − UA(T_tank − T_ambient), with the return term zero when diverted to drain. Rinse supply remains at 20°C. Tank levels and chemical dilution remain outside this illustrative model. Heater ΔT is the liquid supply temperature minus its inlet temperature; a warmer wash inlet reduces the rise and steam required to hold the same supply setpoint.

Sani-Matic: CIP System Design Considerations for Cleaning Pharmaceutical Equipment (August 8, 2017) provides the tube IDs used here and a 5 ft/s pipeline velocity guideline. This tool derives flow directly from those IDs, so decimal results differ from the article’s whole-number values.

The 7 ft/s (2.1336 m/s) target is an additional comparison. The linked article does not establish it as a universal requirement. Likewise, 5 ft/s (1.524 m/s) is a cited design guideline, not a declaration of ASME-BPE, 3-A, or EHEDG compliance. Higher flow can increase pressure losses and utility demand. Select the design target for the application, soils, chemistry, temperature, equipment, and validated procedure.

The two-tank schematic is an original illustration of a common CIP arrangement, with the reference article providing design context. It is not a manufacturer drawing or equipment specification. Equipment locations, levels, and motion are illustrative. The current calculation applies to the selected pipe segment only.