Water, gasoline, liquid waste - all of the above are moved using buckets, pipes, pumps to transfer liquid. Liquids are technically much more efficient to push than to suck. When immersed in a liquid medium, a pump is turned on, which pushes water into the outlet pipe, while liquid flows freely into the inlet pipe.

However, some environments are not well suited for instrument immersion. This is due to the high viscosity of such media (for example, water with sand and silt, fecal fluids). Some media initially contain little liquid (slurry, stucco), and therefore require aerated suction, when the liquid is drawn in using a vacuum. This principle is also used in motor pumps.

Pump specialization dictates the type of pump. Pumps use two types of pumps: - centrifugal , - diaphragm (diaphragm) .

The scope of membrane (vacuum) motor pumps is fecal pits, waste from livestock farms, and other media with high viscosity. To choose the right motor pump, you need to clearly formulate:

Motor pump MODN

Motor-pumps of MODN type are designed for pumping viscous and contaminated liquids: - industrial and waste water; - oil and oil products, including pumping out their spills and residues from tanks. Motor pumps are operated in temperate climate conditions, location category 1 with a nominal ambient temperature not higher than 40 and not lower than minus 400C in accordance with GOST 15150.

Motor pumps, depending on the power of the diesel engine and the design of the pump, are manufactured in four modifications:

Motor pumps type MD 25-70

MD type motor-pumps are designed for water intake from open reservoirs and its supply through pipelines for technical needs, pumping water or other liquids similar to water in terms of chemical activity with a density of up to 1050 kg / m3, temperature from -2 to + 450С, with pH 6-9 , with the content of solid inclusions not more than 0.1% by weight and not more than 0.2 mm in size for MD 25-70 and not more than 5% by weight and not more than 1 mm in size for MD 55-30 .

Diesel pumping unit UN

Design and purpose:

The diesel pumping unit driven by an internal combustion engine of the UN type is designed to take water from open reservoirs and supply it through pipelines for technical needs, pumping water or other liquids similar to water in terms of chemical activity with a density of up to 1050 kg / m3 with a temperature of up to 850C, with pH 6-9, with the content of solid inclusions not more than 1% by weight and not more than 0.2 mm in size.

The UN D10 plant can also be used in other industries, if its parameters and design meet the operating and safety conditions in these industries. The unit belongs to products of type 1 (repairable) in accordance with GOST 27.003 and is produced in a climatic version U of placement category 1 in accordance with GOST 15150 is not intended for installation in explosive and fire hazardous rooms.

Frequently Asked Questions

What are the suction conditions? The greatest suction depth, as a rule, ranges from 7.5 to 8.5 meters. This parameter depends on the pump model. The vast majority of motor pumps are self-priming, have a built-in check valve. This option enables "dry start" when there is no water in the suction hose. Naturally, before starting the pumping part of the pump, its body, should be filled with water. The suction pipe is equipped with a non-deformable hose, best reinforced.

Protection against mechanical damage. Almost all models of motor pumps have suction filters. The grid cells are sized to keep out large solid particles from the suspension that could damage the operation of the pump.

The temperature of the pumped medium. Most pumps on the market are claimed to be able to pump liquids with temperatures up to 90 degrees. It is worth bearing in mind the thermal expansion of materials - with significant heating by secondary heat (from water), the gaps at the interfaces and valves increase, which means that the pressure drops and the efficiency decreases. When you read the specifications, keep in mind that they are for water at room temperature.

Required amount of liquid supply. The market makes it possible to choose a motor pump with any capacity. Special industrial pumps are capable of delivering up to one and a half thousand cubic meters per hour. For the needs of public utilities, incl. private houses, there are more modest household motor pumps.

Required fluid pressure. If the motor pump is designed exclusively for pumping liquid media, the pressure value does not play a big role, so domestic pumps with a pressure of up to 25-35 meters are suitable here. If the pump serves as a fire extinguishing pump, you should pay attention to Japanese quality. Advantages - increased service life and the highest pressure characteristics. These properties are accompanied by a remarkable compactness and small mass of Japanese motor pumps.

What features of the pump are important? These are: - Productivity (in liters or cubic meters) - Height of the water column, from the water level to the pump. -% loss.

An additional factor influencing the choice is the type of drive:

- Motor pumps with diesel drive. As a rule, professional, with a long service life, are equipped with very powerful pumps. Quite economical - fuel costs are low.

- Motor pumps with petrol drive. Used to solve household problems. Combine low cost and modest size.

- Motor pumps with electric drive. Usually used where gasoline and diesel drives are unacceptable for sanitary and hygienic reasons - hangars, caves, boathouses.