Used Centrifugal Pump 25 hp

• Price: $1,500.00
• Manufacturer: Goulds Pumps
• Year of Manufacture: 2012
• Location: Roswell, NM
• Zip Code: 88202
• Size/Dimensions: 25 hp
• Condition: Good
• Type: Used

Used Centrifugal Pump 25 hp

Used Centrifugal Pump 25 hp are the most common type of pump used in industry, agriculture, municipal (water and wastewater plants), power generation plants, petroleum and many other industries. They are the primary pump type in the class of pumps called "kinetic" pumps and are distinctly different than "positive displacement" pumps.

All Used Centrifugal Pump 25 hp include a shaft-driven impeller that rotates (usually at 1750 or 3500 RPM) inside a casing. The impeller is always submerged in water, and when the pump is operational the impeller spins rapidly. The centrifugal force applied to the water from this rotation forces the water outside of the casing, where it exits a discharge port. More liquid is introduced through a suction port, or inlet. The velocity imparted to the liquid by the impeller is converted to pressure energy or "head".

Used Centrifugal Pump 25 hp are unique because they can provide high or very high flowrates (much higher than most positive displacement pumps) and because their flowrate varies considerably with changes in the Total Dynamic Head (TDH) of the particular piping system. This allows the flowrate to be "throttled" considerably with a simple valve placed into the discharge piping, without causing excessive pressure buildup in the piping or requiring a pressure relief valve. Therefore, centrifugal pumps can cover a very wide range of liquid pumping applications.

Used Centrifugal Pump 25 hp Throttling Flowrates

As described above, one key advantage of centrifugal pumps is the ability to "throttle" their flowrates over a wide range. Throttling centrifugal pumps with a discharge valve is not as energy-efficient as using a Variable Frequency Drive (VFD) to slow the pump/motor speed down, but it is much less expensive to install. Of course, throttling a centrifugal pump's flowrate has certain limits.

They should not be throttled below the "minimum safe flowrate" indicated by the pump manufacturer for other than a minute or so; otherwise excessive recirculation can occur inside the pump casing which can cause excessive heat buildup of the liquid. In addition, too much "throttling" will cause excessive shaft deflection which will increase the wear on bearings and seals inside the pump.

Therefore, the ideal flowrate for a centrifugal pump is near its "Best Efficiency Point" (BEP). The BEP can be found on many pump Head-Flowrate Curves that have Efficiency curves shown on the same drawing. The BEP for a given model, speed and impeller diameter is the point where Efficiency is highest; this maximizes energy efficiency as well as seal and bearing life inside the pump.

Another important point is that running centrifugal pumps at 1750 RPM motor speeds instead of 3500 RPM motor speeds will reduce wear on seals and bearings by almost 4 times and the pump will also be less likely to cavitate when less favorable suction conditions (long suction pipes, high "lifts" from ponds or pits, low supply tank levels, or liquids with high vapor pressures such as hot water, gasoline, etc) are involved. However, centrifugal pumps running at 1750 RPM require much larger casings and impellers than those running at 3500 RPM and therefore, cost considerably more money.

Used Centrifugal Pump 25 hp Viscosity

Used Centrifugal Pump 25 hp are designed for liquids with relatively low viscosity that pour like water or like a very light oil. They can be used with slightly more viscous liquids such as 10 or 20 wt. oils at 68-70 deg F (ambient temperatures) but additional horsepower must be added because centrifugal pumps become less inefficient with even slight increases in viscosity and require more horsepower.

When viscosity of the liquids exceed those of 30 wt oils at ambient temps (approx. 440 centistokes or 2,000 SSU), centrifugal pumps become very inefficient and require much more horsepower. In those cases, most pump manufacturers start recommending positive displacement pumps (such as gear pumps, progressive cavity pumps) instead of centrifugal pumps in order to keep horsepower requirements and energy usage lower.

Used Centrifugal Pump 25 hp Horsepower

Used Centrifugal Pump 25 hp also require increases in horsepower when pumping non-viscous liquids that are more dense than water such as fertilizer and many chemicals used in industry. Water has a density of 8.34 lbs/gallon. The specific gravity of any liquid is the density in lbs/gallon of that liquid divided by 8.34. The required increase in horsepower for a centrifugal pump used for a more dense liquid than water is directly proportional to the increase in specific gravity of the liquid.

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