Chilled Water Pump: 1450 RPM, Bronze Impeller | Benefits

In summary, it is recommended to use a 1450 RPM pump with a bronze impeller for pumping chilled water to the chillers due to the potential corrosion of other materials and the cost-effectiveness of bronze. The RPM rating is also important and determined by various factors to ensure proper flow and avoid damage to the pump. It is important to consult with the chiller manufacturer and project specifications to determine the best impeller and RPM for a specific project.
  • #1
maxx_payne
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why is it recommended to use a 1450 rpm pump with a bronze impeller for pumping chilled water to the chillers ?
 
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  • #2
Ask the chiller manufacturer or whoever made the recommendadtion.
 
  • #3
it depends on national codes or proejct's specs. Sometimes the impeller is better to be SS than bronze. And the rpm rating is the recommended for any pump because using the pump at its maximum rpm would shorten its life cycle... hope it did u any good
 
  • #4
The bronze impeller part is the easiest to answer. The use of bronze is because the chemicals used to treat the water will corrode an aluminum impeller, the water will rust a steel impeller, and a stainless steel impeller is about 3 to 4 times the cost of a bronze impeller with no noticable improvement in performance.

The rotation per minute (RPM) of the pump drive motor vary greatly depending on things like gallon per minute (GPM) needed in the system, head pressure of the system (the force to push the water through the piping), impeller size and pitch, etc. Some pumps may have a 1075 RPM drive motor, some may have a 1350 RPM drive motor, while others may have an 800 RPM drive motor.

The project Mechanical Engineer determines the GPM of water needed for the system based on the tonnage of the cooling coils present on the project. They then figure the length and rise of the piping needed on the project. These calculations are then submitted to the pump manufacturer who then sizes the impeller needed with the drive motor to match based on these calculations along with the voltage and amperage ratings submitted by the Mechanical Engineer.

If replacing the drive motor, it is always best to replace the motor with the exact RPM range of the motor. If it is not it can cause issues such as a loss in GPM, an increase in GPM (which can be worse than being under in flow), and can cause the drive motor to have an over design in amperage causing premature failure in the drive motor.
 

1. What is a chilled water pump and what is its purpose?

A chilled water pump is a type of mechanical pump that is used to circulate chilled water through a building's cooling system. Its purpose is to facilitate the transfer of heat from the building's indoor air to the chilled water, which is then sent back to the central cooling system to be re-chilled and recycled.

2. What does it mean for a chilled water pump to have a 1450 RPM speed?

A chilled water pump with a 1450 RPM (revolutions per minute) speed means that the pump's motor is capable of rotating at a maximum speed of 1450 revolutions per minute. This is a common speed for chilled water pumps and is typically chosen based on the specific needs and requirements of the building's cooling system.

3. What is a bronze impeller and why is it used in chilled water pumps?

A bronze impeller is a type of rotating component in a pump that is made from bronze, a type of metal alloy. It is used in chilled water pumps because it is a durable and corrosion-resistant material that can withstand the constant exposure to water and chemicals in the chilled water system. This helps to prolong the lifespan of the pump and maintain its efficiency.

4. What are the benefits of using a chilled water pump with a bronze impeller?

There are several benefits to using a chilled water pump with a bronze impeller. It is highly resistant to corrosion, which helps to prevent damage and prolong the pump's lifespan. It also has a low coefficient of thermal expansion, meaning it can withstand extreme temperature changes without warping or breaking. In addition, bronze impellers are often more cost-effective than other materials, making them a popular choice for chilled water pumps.

5. Can a chilled water pump with a bronze impeller be used in all types of buildings?

Yes, chilled water pumps with bronze impellers can be used in a wide range of buildings, including commercial, industrial, and residential properties. They are versatile and can be customized to meet the specific needs and requirements of different cooling systems. However, it is always important to consult with a professional to ensure that the pump is the right fit for the building's cooling system and usage needs.

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