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Posted: August 24th, 2022
A water pipeline consists of three pump stations, each having one constant-speed motor-driven pump of 2000 HP.essay
A water pipeline consists of three pump stations, each having one constant-speed motor-driven pump of 2000 HP. The analysis of current operations shows that the pipeline has been operating at a fairly constant flow rate of 3000 gal/min, and the pump throttle pressures are as follows:
A water pipeline consists of three pump stations, each having one constant-speed motor-driven pump of 2000 HP. The analysis of current operations shows that the pipeline has been operating at a fairly constant flow rate of 3000 gal/min, and the pump throttle pressures are as follows:
A water pipeline consists of three pump stations, each having one constant-speed motor-driven pump of 2000 HP. The analysis of current operations shows that the pipeline has been operating at a fairly constant flow rate of 3000 gal/min, and the pump throttle pressures are as follows:
Pump station 2:75 psi
Pump station 3:85 psi
Pump station 1 has zero throttle pressure. Trimming the pump impellers to the correct size so as to eliminate wasted HP from pump throttle is estimated to cost $50,000 per pump station. Retrofitting each pump station with VFD motor-driven pumps is estimated to cost $500,000 per pump station. The operating cost for the VFD units is $50,000 per site.
(a) Determine the economics of installing trimmed impellers and the payment period based on 8% interest rate. Assume 80% pump efficiency for HP calculations and an electricity cost of 10 cents/kWh.
(b) If it was decided not to trim the pump impellers, compare the VFD motor option with the constant-speed pump option. Consider the control valve annual operating cost to be $5000 per site.
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A water pipeline is made up of three pump stations, each with a 2000 HP constant-speed motor-driven pump. The pipeline has been operating at a fairly consistent flow rate of 3000 gal/min, according to a review of current operations, and the pump throttle pressures are as follows:
A water pipeline is made up of three pump stations, each with a 2000 HP constant-speed motor-driven pump. The pipeline has been operating at a fairly consistent flow rate of 3000 gal/min, according to a review of current operations, and the pump throttle pressures are as follows:
A water pipeline is made up of three pump stations, each with a 2000 HP constant-speed motor-driven pump. An examination of current operations reveals that the pipeline has been running at a reasonably steady rate.
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