Bill of materials for this line
Yazıcı Endüstri · yaziciendustri.com.tr| Material | Quantity | Note |
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How do we calculate?
Flow rate = heat load (kW) × 0.86 ÷ ΔT. Pressure loss is calculated with the Darcy-Weisbach formula for 70 °C water and steel pipe roughness. Velocity limit: 1.0 m/s up to DN50, 1.5 m/s up to DN150, 2.0 m/s above. 30% is added to the line loss for elbows and valves. Pipe dimensions follow EN 10255 / EN 10220, flanges and bolts our EN 1092-1 PN16 catalogue.
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Send us the list from the calculator; we will quote flanges, elbows, tees, reducers, pipes and valves in a single offer, with EN 10204 3.1 material certificates.
Frequently asked questions
How is the pipe size calculated in a heating system?
First the flow rate is found: flow (m³/h) = heat load (kW) × 0.86 ÷ supply-return temperature difference (°C). Then the smallest pipe size that keeps velocity and pressure loss per metre within suitable limits at this flow is selected. Our calculator does this automatically.
This calculator is used in these sectors: Building services (HVAC & plumbing). All calculators →
Results are for preliminary selection and do not replace engineering design. Ask our technical team for the final selection.