Monoblock Comparisons

A centrifugal pump is a pump in which fluid enters through the eye of an impeller and gains momentum inside the rotating vanes of the impeller and discharged through the volute casing.

Monoblock pumps are a centrifugal pump in which fluid enters suction port and agitated inside the impeller and discharged through the large or small volute casing based on the head & discharge requirement (high speed monoblock or slow speed monoblock)

The fluid enters the pump impeller along or near to the rotating axis and is accelerated by the impeller, flowing radially outward into a diffuser/casing, from where it exits.

Pump in which all rotating parts are mounted on a common shaft.

Occupies a considerable space as the assembly is kept on a platform.

Comparatively small in size and hence occupies less space.

• Water
• Sewage
• Petroleum
• Petrochemical pumping

• Drinking water supply
• Small scale agriculture

• Works well when a high amount of liquiod discharge is required.
• Easy to repair.
• Assembly can be kept at a distance from water source, saving immediate space.

• Works well for domestic applications.
• Easy to maintain,
• Assembly can be kept at a distance from water source or nearer.

• Fluid is pulled from the source by suction & the suction limit is <5 m.
• Can overheat due to low flow.
• Leakage can occur along rotating shaft.
• Can be susceptible to cavitation and corrosion.

• There is no energy loss during energy transmission.
• Priming is required.
• Wear and tear of components when encountering solid particles.
• Operation can be noisy.

Monoblock pumps are a centrifugal pump in which fluid enters the suction port and is agitated inside the impeller. This is then discharged through the large or small volute casing based on the head & discharge requirement (High speed monoblock or slow speed monoblock)

Part of fluid from delivery pipe is diverted back to venturi pipe to create a suction force at the impeller. The impeller then starts rotating and draws water after it attains the required suction force.

A pump in which all rotating parts are mounted on a common shaft.

A pump that operates on the principle of a high-pressure fluid jet and the venturi effect.

Comparatively small in size and hence the space occupied is less.

Requires separate pump house to keep the assembly, taking up more space.

• Drinking water supply.
• Small scale agriculture.

• Domestic water pumping

• Preferred where high discharge is required.
• Can be used where the water source has continuous discharge.
• Needs less space for installation.

• Preferred where the water is available at shallow depth.
• Works well where there is an intermittent discharge.
• Pressurised water delivery at outlets.

• Needs protection against wind and rainfall.
• Overheating due to low flow.
• Leakage along rotating shaft.
• Susceptible to cavitation and corrosion.

• Frequent air lock.
• Consumes more power.
• Less efficient.
• Needs more careful maintenance.