Features of the device and the choice of a motor pump

A motor pump is a type of water pump that is positioned above the liquid being pumped and is powered by either an internal combustion engine or an electric motor. When operating normally, it can draw water from a specific depth and pump it at a high rate to a distance and height determined by its technical specifications. It is distinguished from stationary units by its mobility, which has led to its widespread use in diverse industries and sectors of the economy.

Scope of application of motor pumps

• drainage of excavation sites and trenches during the building process;
• pumping liquids in case of emergency recovery operations carried out by municipal and rescue services;
• establishing water reserves for industrial and firefighting needs;
• suppressing fire outbreaks effectively;
• providing irrigation for agricultural lands and maintaining the optimal water levels for gardens and park vegetation.

Design and principle of operation

A water pump is a unit that consists of a motor and a centrifugal pump combined together. In order to achieve maximum compactness, these pumps are typically arranged coaxially or mounted on a common shaft. Additionally, most models come with a rigid frame that serves as a stable foundation, making them easy to carry and hitch with lifting gear. For heavier products, they can be mounted on movable platforms.

The pump features a sturdy hollow casing with intake and discharge nozzles. Within the casing, a rotating shaft houses an impeller equipped with blades. The suction connection is connected to a suction hose fitted with a check valve, which can either be submerged in a pond or connected to a reservoir that requires pumping. In order to prevent the equipment from getting clogged with algae, debris, or other mechanical objects, the intake hose is often equipped with a suction filter. The discharge connection is linked to a pressure hose or piping to direct the fluid away.

The motor pump operates on a simple principle. Upon starting the engine, the impeller spins rapidly, expelling air from the casing. As a result of the resulting vacuum, the pump draws in liquid through the intake and forcefully ejects it in the direction of the pumping motion.

Classification of motor pumps by engine type

Firstly, pumps can be classified based on the type of engine they have. The most common types are:

• Gasoline-powered pumps;
• Diesel-powered pumps;
• Gas-powered pumps;
• Electric pumps.

A portable gasoline pump is a versatile option. Despite its compact size, it can generate a significant amount of power. It is user-friendly and offers complete independence. Additionally, pumps with electric starters are effortless to start in any weather conditions and deliver consistent performance.

A wheeled chassis is suitable for the installation of a high-pressure firefighting motor pump with such a drive. This motor pump operates with reliability, ensuring it won’t malfunction when confronted with a critical situation.

Gas-powered models share several similarities with their gasoline counterparts, with the key difference being their utilization of a liquid propane-butane mixture as fuel.

When there is a need for a large amount of fluid to be pumped, a diesel pump comes into play. These types of pumps, which have the ability to prime themselves, tend to be quite heavy. They can either be stationary or mounted onto a trailer. Their purpose is to provide a high-pressure source for pumping water to faraway locations and high elevations.

The electric pump is incredibly simple to use, needing no special upkeep or frequent repairs. It can function in enclosed spaces, pits, and wells, where equipment with an internal combustion engine cannot be installed due to the emission of exhaust gases. However, the electric motor pump does have one notable drawback: it cannot be utilized in areas without access to a reliable power grid. Nevertheless, it can be utilized with great intensity in urban utilities or on a cottage plot.

Classification by type of pumped liquid

Pumps are used in the field to move liquids with different levels of purity and solids. When dealing with highly contaminated water, there are specific challenges such as abnormal acidity levels and intense mechanical stress on the pump components. To address these issues, motor pumps have been specially designed to handle varying degrees of contamination, featuring different designs and materials.

In general, these pumps can be categorized into several groups:

• Pumps for clean and slightly contaminated water
• Pumps for moderately polluted water
• Pumps for heavily contaminated water

The higher the level of contamination and the larger the particles present, the wider the clearances in the fluid path and the higher-quality steel needed for the pump parts.

Aside from centrifugal pumps, diaphragm pumps are also utilized for handling non-aqueous mud and thick, viscous liquids. These pumps do not have any high-speed rotating components in contact with the pumped substance, thereby reducing the risk of wear and tear.

Hint: The technical documentation of pumping equipment always reflects its purpose. When purchasing a slurry pump for the purpose of pumping sludge or a hot water pump, it is important to ensure that their intended application aligns with your specific operating conditions.

Main technical characteristics and selection tips

The key technical characteristics of any pump include:

• the volume flow rate of the liquid, which is measured in m³/hour or l/min;
• the maximum head, which is measured in meters of liquid column, atmospheres of overpressure, or MPa;
• the suction depth, which is measured in meters.

Additionally, to estimate the upcoming operating costs and ensure proper connection, it is important to know:

• the power consumption;
• the fuel consumption during normal operation;
• the diameter of the inlet and outlet ports, along with the recommended method of pipe or hose connection.

When choosing motor pumps, it is important to keep in mind the principle of reasonable sufficiency, as with any other technical devices. The pumps should be suitable for the specific conditions of your application and ideally have slightly higher performance than what is required.

Industrial motor pumps, for example, have the capability to pump hundreds of cubic meters of water per hour at pressures of tens of atmospheres. However, it’s important to consider that more powerful equipment comes with a higher price tag and requires greater operating costs.

For dachas, it is necessary to have very small units that are specifically designed for organizing irrigation or filling containers. In most cases, a flow rate exceeding 10 m³/hour or 180 l/min is rarely required.

When it comes to selecting the appropriate pump, the process becomes slightly more complicated. You must consider the height difference between the pump’s location and the discharge points. The hydraulic resistance of the pressure pipe also plays a role, which is influenced by its length, diameter, and the presence of branches. It is unlikely that you will need to perform engineering calculations for water supply on a garden plot near a well or natural water source, but it is necessary to provide a pressure reserve of 2-3 atmospheres.

Overview of popular manufacturers

Good quality pumping equipment can be expensive. To ensure its efficiency and avoid the hassle of searching for spare parts and constant repairs, it is recommended to purchase products only from reputable manufacturers. The top motor pump brands are traditionally known to come from Europe, USA, and Japan.

In the motor pump rankings, leading positions are held by global brands such as Honda, Hitachi, Subaru, Fubag, DDE, and Hüter. Prices for their most popular models with internal combustion engines for clean water start at 10,000 rubles, while prices for models designed for mud start at 20,000 rubles. Budget-friendly Russian and Chinese brands such as Kraton, Kalibr, Patriot, Champion, and Elitech can be purchased for prices ranging from 6,000 to 18,000 rubles.

In this motor pump review, you will find a list of the most popular models along with their approximate costs:

1. Honda motor pump – starting at 10,000 rubles
2. Hitachi motor pump – starting at 10,000 rubles
3. Subaru motor pump – starting at 10,000 rubles
4. Fubag motor pump – starting at 10,000 rubles
5. DDE motor pump – starting at 10,000 rubles
6. Hüter motor pump – starting at 10,000 rubles
7. Kraton motor pump – starting at 6,000 rubles
8. Kalibr motor pump – starting at 6,000 rubles
9. Patriot motor pump – starting at 6,000 rubles
10. Champion motor pump – starting at 6,000 rubles
11. Elitech motor pump – starting at 6,000 rubles
12. The Honda WB20X is a gasoline pump designed for pumping dirty water. It has a capacity of 575 liters per minute and can reach a head of 28 meters. This powerful pump is available for purchase at the price of 26,000 rubles.
13. Another option for pumping dirty water is the ROBIN-SUBARU PTG310S gasoline motor pump. With a capacity of 1000 liters per minute and a head of 23 meters, this pump is capable of handling large volumes of water. It is available for the price of 39,000 rubles.
14. The FUBAG PTH 600 is a gasoline pump designed for lightly contaminated water. It has a capacity of 600 liters per minute and a head of 23 meters. This reliable pump is available for purchase at the price of 31,000 rubles.
15. The price of the CHAMPION GP26-II gasoline pump for clean water is RUB 6,000. It has a capacity of 130 l/min and a head of 30 meters.

Is it possible and is it necessary to make a motor pump with your own hands?

Attention! Pumping equipment falls into the category of highly technical products that require factory-made components and precise assembly. It is not a feasible task to construct a motor pump from scratch in a non-professional setting.

Several artisans claim to have created a water pump using motor piston pumps crafted from pneumatic bicycle pumps or segments of water pipes. However, there is no doubt that such a motor pump, if it even works, will have a short lifespan and an extremely low level of efficiency due to the poor fit of its pump elements.

Engaging in repetitive disassembly and reassembly of components in an attempt to achieve a satisfactory outcome is not the most rewarding task. Is it worth investing your time and efforts into it? The affordable price of small household water pumps allows you to purchase a robust and efficient unit for your farm.

Pro tip! Alternatively, you can experiment with adapting a drive from a compact electric motor or a carburetor engine from an old gasoline-powered lawn mower to a pre-made manual pump. In this scenario, the layout solution will entirely depend on the brand and design characteristics of the available units.