Self Priming Monoblock Pump

Self Priming Monoblock Pump


The self priming monoblock pump is a garage floor drain used in residential and commercial settings. A self priming monoblock pump is designed to work with most types of wastewater, including oil-based fluids.

The owner or operator of the system needs to know how this particular model works to install it without any issues arising down the line properly. We will go over some basics about these pumps below and their advantages and disadvantages.

What is a self priming monoblock pump?

A self priming monoblock pump is a pump that can prime itself without the need for an external source of water. This is done by using the pump’s own moving parts to create a vacuum that draws in water from the environment.

Self priming pumps are often used in applications where there is no available water source nearby or when the water source is dirty or unreliable. They are also used in places where it would be difficult or impossible to install a traditional pump.

How does a self priming monoblock pump work?

A self-priming monoblock pump is designed to draw liquid up from a source and push it through the pump without any assistance. This is done by creating a vacuum within the pump that draws in the liquid from the source. The liquid is then forced out of the pump and into the system.

This works by allowing the pump to move liquid using only the energy inside of itself. It moves an internal plunger or piston, which compresses air or gas inside the pump. This creates a vacuum that then pulls in the liquid from the outside.

Self priming monoblock pump types

There are three main types of self priming monoblock pumps: centrifugal, positive displacement, and rotary.

Centrifugal pumps are the most common type and work by using a spinning impeller to move water from the inlet to the outlet. They are easy to use and relatively inexpensive, but they can be noisy and are not as efficient as other types of pumps.

Positive displacement pumps are more efficient than centrifugal pumps and can handle higher viscosities, but they are more expensive and difficult to operate.

Rotary pumps are also more expensive than centrifugal pumps, but they are very efficient and can handle high viscosities. They are also very quiet and easy to use.

Advantages of self priming monoblock pump

  1. Self priming monoblock pumps don’t necessarily need to be primed (in the case of non-submersible models) before they can begin functioning, thus saving both time and labor costs on installation. This is a highly beneficial aspect as there is no need for expensive equipment such as bucket elevators or other types of prime movers.
  2. Really dependable, self priming monoblock pumps require fewer connections than some other unique pumping systems and thus more easily fit into a preexisting infrastructure. This makes maintenance relatively easy and helps ensure that there aren’t any surprises during repair procedures.
  3. Compared with submersible models, self priming monoblock pumps are inherently more efficient. This is because the head pressure of what is being pumped does not affect flow rates, allowing for a constant output that requires less power input overall.
  4. Less maintenance is required with self priming monoblock pumps as they have fewer moving parts and thus fewer components to wear out over time.
  5. Self priming monoblock pumps offer greater strength in heavy-duty applications due to their custom design and heavy-duty construction and materials (such as high-grade alloy impellers).
  6. The ability to work efficiently without needing to be primed means no need for an extra storage tank or reservoir, which can save significant amounts of space.
  7. Self priming monoblock pumps are typically resistant to damage from water hammer effects, a significant problem commonly associated with submersible pumps.
  8. Thanks to their ability to avoid the issues associated with cavitation, self priming monoblock pumps can run much more quietly than other pump types and thus require less consideration regarding where they will be placed in a building or office setting.
  9. Self priming monoblock pumps generally have an accelerated drain capability that allows them to quickly empty reservoirs or tanks when needed and then move on to another task before any potential harm occurs due to an already full system (i.e., overflow).
  10. The ease with which they can be installed means that self priming monoblock pumps are also great for disaster relief efforts, as they can easily be transported to an affected area and set up quickly.

Disadvantages of self priming monoblock pump

  1. Self-priming monoblock pumps are only available in smaller sizes. This may limit their use in some settings or organizations where the job requires larger systems.
  2. Self priming monoblock pumps can’t always handle high-efficiency filtration equipment without being fitted with a bypass valve (which has its own separate cost).
  3. Unlike submersible models, self priming monoblock pumps cannot be used in a completely submerged state and must always have a small air pocket available. This means that they may not work as well in high-pressure systems where the pressure is more significant than what can safely remain within the pump during operation.
  4. While self priming monoblock pumps offer more minor frictional losses, they are still far from being perfectly efficient – especially when compared to other types of technology.
  5. Installation costs for self priming monoblock pumps are significantly higher than those associated with submersible models due to additional fittings and design components that add to both time and overall expense (though in some cases, this can be offset fully or partially by eliminating the need for an extra storage tank).
  6. Self priming monoblock pumps are typically not equipped to handle changes in water pressure very well and may shut down or stop working altogether if a drop in system pressure occurs.
  7. Cavitation’s long-term effects can be a serious concern for self priming monoblock pumps, especially when moving from one water source to another of differing pressures/properties (such as going from a pond to a municipal tap).
  8. It is more difficult for self-priming monoblock pumps to run quietly than for submersible models due to their higher operating speeds, which can produce more noise under some circumstances. This only becomes an issue with larger systems that require more power input overall, but it does make a difference in some cases.
  9. Self priming monoblock pumps typically have a lower maximum flow rate than submersible models due to their design and overall configuration.
  10. The unique design of self-priming monoblock pumps provides much less power than other types of pump technology and many specific brands and models within the same general family.

In most cases, this does not pose much of an issue unless it is needed for larger systems or those that require very high-pressure operation from the pumps involved.

Self priming monoblock pump application

A self priming monoblock pump is a pump that can be used to draw water from a well or other water source. It has a built-in priming system that allows it to suck in water from the source and then push it through the pump and out to the desired location.

Self priming monoblock pumps are often used in agricultural applications where there is a need to move large amounts of water quickly and efficiently. They can also be used for residential applications, such as drawing water from a well or cistern.

Self priming monoblock pumps are not recommended in industrial settings because they are often less efficient than other pumps.

Troubleshooting a self priming monoblock pump

The most common way for these pumps to fail is if they don’t prime when you first turn them on, especially if your water supply stops and there’s no pressure left in the lines. The problem may be that the pump isn’t primed correctly, or it could mean something wrong with the internal parts that would require repair by replacing the entire unit.

If you hear the motor running but nothing is coming out of your pipes, check all your connections and make sure there’s no debris clogging things up. If everything looks good, measure how much voltage the pump needs to run – it should need less than 24 volts to start up.

If you have plenty of water pressure, but the pump doesn’t work, then it’s likely that something is clogging up the impeller preventing it from rotating, or there’s a problem with the motor (if it gets hot or smells like burnt rubber).

Check for debris, algae buildup on the outside of the impeller, make sure your strainer isn’t too small, and remove any obstructions between where water enters and exits. It’s also possible that some debris has blocked the intake opening on one side of this pump.

You can take off both covers on top to check for things like leaves, food particles, etc. – if you find anything, clean it out before reassembling the unit.

If you hear grinding sounds coming from inside this pump, it could be because something is off balance or the motor cannot start up properly. Check for debris, dirt, or algae around where water flows into this pump through the intake opening.

If these are clean, check your strainer housing for cracks because sometimes these pumps can get stuck when too much sediment builds up in the strainer, and they wear out over time after years of use pushing against a clogged pipe filter.

Also, look at your anti-siphon device and make sure that it hasn’t been pushed down into the water supply line by pressure forcing it shut – but if this is working, you may have a bigger problem with this pump not starting up. Lastly, you could always check with your self priming monoblock pump manufacturer just to be safe.


Self priming monoblock pumps are a type of pump that uses centrifugal force to create pressure. They work by drawing water from the bottom, spinning it at very high speeds, and then forcing it back into the tank or pool as they spin.