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Difference Between Monoblock And Centrifugal Pump - NTGD Pump

Differences in Operating Principles

Monoblock Pump: The pump operates by using a plunger to reciprocate within a cylinder, changing the volume of the working chamber to draw in and discharge liquid. Its main characteristic is the ability to generate high pressure, with a relatively small and stable flow rate.

Centrifugal Pump: The centrifugal pump works by rotating an impeller to generate centrifugal force, which propels the liquid outward toward the pump casing, causing the fluid to flow. Its main characteristic is a high flow rate, making it suitable for low-viscosity liquids, with the flow rate significantly affected by pressure changes.

Difference in Startup Procedure

• Centrifugal Pumps: These pumps require the discharge valve to be closed during startup. This practice ensures that the pump does not run under a no-load condition, which could cause damage or excessive wear.
• Monoblock Pumps: In contrast, monoblock pumps need the discharge valve to be open when starting. Closing the valve can lead to a rapid pressure increase, potentially harming the pump and the associated system.

Difference in Flow Regulation

• Centrifugal Pumps: Typically equipped with a flow regulation mechanism at the discharge, centrifugal pumps allow for flow adjustment by partially closing the discharge valve. This alters the system resistance, thereby changing the flow rate.
• Monoblock Pumps: These pumps usually do not feature a flow regulation mechanism at the discharge. They deliver a consistent flow rate that remains relatively unaffected by changes in discharge pressure.

Difference in Discharge Pressure

• Centrifugal Pumps: While capable of achieving high pressures, centrifugal pumps generally operate at lower pressures compared to monoblock pumps. The pressure is influenced by the pump’s design and operational speed.
• Monoblock Pumps: Known for their ability to produce high discharge pressures, monoblock pumps are ideal for applications requiring precise and high-pressure delivery.

Difference in Application and Flow Characteristics

• Monoblock Pumps: Often used as metering pumps, monoblock pumps provide a nearly constant flow rate regardless of pressure variations. They are suitable for applications that require precise volume measurement and control, such as chemical dosing. Their flow rates are generally lower but remain consistent as long as the stroke length is unchanged.
• Centrifugal Pumps: Though capable of achieving high pressures, centrifugal pumps are more suited for applications needing continuous flow. The flow rate of a centrifugal pump is continuous and varies with changes in system resistance, which is an important consideration during pump selection.

Difference in Operational Differences

• Flow Continuity: Monoblock pumps, being volumetric, produce a pulsating flow. During the suction phase, there is no flow, leading to intermittent delivery. This characteristic must be considered when selecting the pump for specific applications.
• Centrifugal Pumps: These pumps provide a continuous flow, crucial for processes requiring steady fluid delivery without interruption.

Difference in Pressure and Flow Regulation

• Monoblock Pumps: Pressure regulation is achieved by adjusting the pump speed rather than using a discharge valve. Theoretically, these pumps can generate infinitely high pressures if there is no relief or safety mechanism in place.
• Centrifugal Pumps: Pressure and flow are typically controlled by a discharge valve. The head (pressure) is inversely proportional to the flow rate and directly proportional to the system resistance.

Difference in Startup and Operational Method

• Monoblock Pumps: Pressure regulation is achieved by adjusting the pump speed rather than using a discharge valve. Theoretically, these pumps can generate infinitely high pressures if there is no relief or safety mechanism in place.
• Centrifugal Pumps: Pressure and flow are typically controlled by a discharge valve. The head (pressure) is inversely proportional to the flow rate and directly proportional to the system resistance.

Differences in Application Fields

• Monoblock Pump: Monoblock pumps are commonly used in high-pressure, low-flow applications such as hydraulic systems, fuel injection systems, and chemical injection systems. They are particularly suitable for scenarios requiring precise metering and high pressure.
• Centrifugal Pump: Centrifugal pumps are widely used in low-pressure, high-flow applications such as water treatment, petrochemical industry, agricultural irrigation, and municipal water supply and drainage. They are ideal for transporting low-viscosity, non-corrosive liquids.

Conclusion

Understanding these differences between monoblock pump and centrifugal pump will help you select the right pump, ensuring efficiency, safety, and effectiveness in various industrial processes.