How Variable Speed Pumping PAYS OFF!
A pump is predictable in the method it reacts to system demand. As the demand
fluctuates, the pump travels back and forth on its curve. A drop in demand causes the
pump to move back on its curve and, consequently, generate a higher pressure. In a
pressure boost system, this added pressure is absorbed by the Pressure Reducing
Valve (PRV). The net result is WASTED ENERGY. FIGURE A Typical Usage Profile.
Variable speed pumping enables us to match the discharge pressure of the pump to
the correct system requirements. This markedly reduces the amount of energy wasted
in the form of pressure absorbed by the PRV. In most cases the PRV will be eliminated.
In FIGURE B the system is designated to provide 55 PSIG at the discharge header. This
red and blue diagonal lines represent the excess pressure generated by constant speed
pumps. This is the pressure that must be absorbed by the PRVs. We will refer to this
as the " Variable Speed Sector ". By varying the speed of the pump(s), we will
operate at any point within this sector. Therein generating only the amount of pressure
the system requires. Whereas energy consumption of a centrifugal pump VARIES as
the CUBE of SPEED, we then reduce power consumption by 27% by merely reducing
pump speed to 90%. Our variable speed BPCS is capable of meeting demand at less
than 90% speed ( if your current pumps were properly selected in the original design)
so your savings maybe even greater. ROI
Our BPCS is designed as a retrofit to your existing pumps;
therefore, you should receive the benefit of an accelerated ROI.
We do offer the option of a complete booster pumping system.
This chart is based upon
a COMPLETE Skid mounted
(new pumps) pumping system.
Utilizing your exiting pumps
and ancillary devices should
decrease payback by a factor
of 2.
