Using Pressure Switches to Shut Down Unnecessary Pumps

In most industrial plants the demand for the pumped liquid varies over time. If the pumping system is set up to supply maximum demand flows when flow needs are variable and intermittent this will result in excessive energy consumption, and may also lead to the loss of fluid, during times of reduced demand. Pressure switches may help reduce energy consumption by shutting down the pumps in response to the reduced demand in the system.

Development Status Products
Commercial

Using Pressure Switches to Shut Down Unnecessary PumpsCosts & Benefits

Parent Process: Pump Systems
Energy Savings Potential

This measure is estimated to offer following improvement potentials (UNIDO, 2010):
• 10% for low efficiency base cases;
• 5% for medium efficiency base cases;
• 2% for high efficiency base cases;

Electrical and primary energy savings potential of this technology for diffierent countries is estimated as following (UNIDO, 2010): 

  Final* (GWh/y) Primary* (TJ/y)
US 2869 31500
Canada 856 10663
EU 2059 19347
Thailand 162 1625
Vietnam 129 1840
brazil 235 2624
CO2 Emission Reduction Potential

Total emission reduction potential, as kt CO2/y for different countries are estimated as (UNIDO, 2010): 

US 1729
Canada 426
EU 898
Thailand 83
Vietnam 63
brazil 34

Costs

Estimated typical capital costs of this measure for different system sizes (S) are:
• US $3000  for S < 37 kW;
• US $3000 for 37 kW < S < 75 kW;
• US $3000 for 75 kW < S < 150 kW;
• US $3000 for 150 kW < S < 375 kW;
• US $ for 375 kW < S < 745 kW; (UNIDO, 2010)

Cost of conserved energy, expressed as US $/MWh-saved, in different countries are estimated as following (UNIDO, 2010):

US 65.7
Canada 64.5
EU 76.6
Thailand 45.1
Vietnam 24.3
brazil 44.7

Using Pressure Switches to Shut Down Unnecessary Pumps Publications

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39-48

Using Pressure Switches to Shut Down Unnecessary Pumps Guidelines

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13