Talk:Captain James Cook Memorial

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Pump power not correct

Latest comment: 4 years ago2 comments2 people in discussion

Article states: "250 litres per second against a head of 183 metres" and "two 3.3 kVA pumps".^[1] (about 4.4 horsepower) Is the 250 liters per second for one or two pumps?

The article states that "The design of the jet is based on the Jet d'Eau in Geneva, Switzerland" Jet d-Eau Five hundred litres (110 imp gal; 130 US gal) of water per second are jetted to an altitude of 140 metres (460 ft) by two 500 kW pumps (about 670 horsepower)

As a tie breaker, Engineering toolbox when set to density of water - kg/m^3: 1000 , efficiency: 0.9 , volume flow (m3/s): .25 (250 liters per second), head (m) 183 - The result is 404 kW per pump.

I propose finding a source that give a more realistic value or removing that data from the article. 2606:6000:CB81:1700:8567:58A3:B73A:DFD1 (talk) 09:14, 24 March 2020 (UTC)Reply

You're right, the press release got the unit wrong. The two motors driving the pumps have a voltage of 3.3 kV^[2]. One of the mechanical engineers who worked on the fountains upgrade in 2014 mentions on his LinkedIn profile that "The jet consists of two pumps, each driven by a 640 kW water cooled 3.3 kV electric motors, which propel 6 tonnes of water down 150m of 450dia pipework and up to a height of more than 152m."^[3]. This appears realistic (640 kW motor input power * assumed 90 % motor efficiency * assumed 70 % pump efficiency = 403 kW pump hydraulic power), but I have not been able to find a citable source for this.--Tentotwo (talk) 11:57, 23 September 2020 (UTC)Reply

References

^ "Australia's Captain Cook Memorial Jet to reach new heights" (PDF). nca.go.au source. 6 March 2017.
^ Andrich, Deborah. "Jetting Over the Hurdles" (PDF). Electrical Connection (Autumn 2018): 32. Retrieved 23 September 2020.
^ Ward, Christopher. "Captain Cook Memorial Jet, Lake Burley Griffin, Parkes ACT". LinkedIn. Retrieved 23 September 2020.

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[1] "Australia's Captain Cook Memorial Jet to reach new heights" (PDF). nca.go.au source. 6 March 2017.

[2] Andrich, Deborah. "Jetting Over the Hurdles" (PDF). Electrical Connection (Autumn 2018): 32. Retrieved 23 September 2020.

[3] Ward, Christopher. "Captain Cook Memorial Jet, Lake Burley Griffin, Parkes ACT". LinkedIn. Retrieved 23 September 2020.

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