Pipe Size Optimisation

Find the economically optimal pipe diameter by minimising total annualised capital and energy costs — Hazen-Williams method.

System inputs

Discharge (l/s)

Pipe length (m)

Static lift (m)

Hazen-Williams C

Pumping time (hr/day)

Pumping days (days/yr)

Economics

Pump efficiency (%)

Energy cost ($/kWh)

Interest rate (%)

Asset life (years)

Pipe catalogue — sizes & installed unit costs *

	Diameter (mm)	Installed cost ($/m)	Remove

Results

Energy cost/yr Pipe cost/yr (amortised) Total annual cost

Diameter	Velocity	Hyd. gradient	Head loss	Power	Energy cost/yr	Pipe cost/yr	Total/yr