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Methodology

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Checks

• UDL beam, 8 kN/m on 6 m: reactions 24 kN, moment 36 kN·m.
• Slab 4.5 × 2 × 0.2 m: 1.800 m³.
• Slope 0.15 / 3: 5% and 1 in 20.
• Shaft 50 N·m at 1450 rpm: 7.59 kW.
• Ohm 230 V, 46 Ω: 5 A, 1,150 W.
• Voltage drop 16 A, 25 m, 2.5 mm² copper: about 5.5 V.
• Pump 0.02 m³/s, 15 m, 70%: 2.94 kW hydraulic, 4.20 kW shaft.
• Pipe 0.02 m³/s, 150 mm: about 1.13 m/s. f = 0.02, 50 m: about 0.43 m head loss.
• Pad 400 kN on 1.5 m square: 178 kN/m² average.
• Three-phase 400 V, 32 A, pf 0.85: 18.85 kW.
• Formwork 25 kN/m³ over 3 m: 75 kN/m² hydrostatic bound.
• Rational runoff C 0.8, 50 mm/h, 0.4 ha: 44.5 L/s.

What we will not add

Code unity checks, reinforcement design, cable selection from BS 7671 tables, or a “pass” badge. Those need a project standard and a responsible person. A green tick on a free page would be the wrong product.

Last checked 3 October 2026.

What to write beside the result

A review can only check this figure if the inputs sit next to it. Write the value, the unit and the assumption the form used. A diameter in millimetres and a diameter in metres are not the same reading. A force in kilonewtons divided as if it were newtons is a thousand-fold error.

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