If it is necessary to quickly pump out contaminated water, the foremen use drainage pumps. Models are divided into surface and submersible. The second option is preferable, since there is a natural cooling of the engine by the pumped medium. One of the most popular types of submersible pumps is the Stavr unit. With optimal technical characteristics, it also has a favorable cost.
Device and principle of operation
- Electrical engine. Can be single-phase or three-phase.
- Working shaft with impeller. Fastened separately from the engine or to it.
- Centrifugal pump with inlet.
- Polymer or stainless steel housing. The first option is not reliable enough in terms of accidental mechanical influences.
- Float switch. Provides protection of the unit against dry running.
Do not confuse a drainage unit with a faecal one. The latter also has a special cutting knife for shredding biomass.
The Stavr submersible drainage pump operates according to the following principle:
- The device is immersed to a predetermined depth. They are included in the network.
- An electric motor enters the work, which starts the rotation of the wheel shaft. The impeller starts rotating.
- When the blades move around them, rarefied air is formed, and the pressure in the chamber is significantly reduced.
- This facilitates the suction of water and its further movement to the outlet pipe under the influence of centrifugal force.
- As soon as the liquid level in the tank drops to a minimum, the float switch stops the pump.
Drainage submersible units are used when draining flooded premises, pumping water from ravines, filling containers for irrigation from a nearby pond.
Model range of pumps Stavr
There are several modifications of Stavr drainage units on the market. Each of them has different technical characteristics. The device of the models is identical.
Pump Stavr NPD-400SH
The body of the device is made of durable polymer. The unit is equipped with a float switch and an ergonomic handle for easy transport. Pump specifications:
- power - 400 W;
- maximum pressure - 1 atm .;
- maximum immersion depth - 5 m;
- productivity - 50 l / min;
- permissible impurity diameter - 0.5 mm;
- head - 10 m;
- maximum temperature of the pumped-over medium - +35 degrees;
- the section of the outlet pipe is 25 mm.
The device weighs only 3.8 kg. The device is equipped with a 10 m cable. The factory warranty is 3 years.
Model NPD-450
The pump is designed for pumping clean or dirty water. The body of the device is plastic. The set includes a coupling with adapters for connecting a hose. The technical parameters of the model are as follows:
- power - 450 W;
- maximum working pressure - 0.6 atm .;
- permissible immersion depth - 5 m;
- head - 6 m;
- section of the outlet pipe - 25 mm;
- productivity - 125 l / min;
- the limiting temperature of the pumped-over water - +35 degrees;
- the maximum size of debris impurities is 35 mm;
- cable length - 10 m;
- device weight - 3.5 kg.
The pump also has a factory warranty of 3 years.
Stavr PND-810M
The housing of this submersible pump is made of stainless steel. Like previous models PND-810 M is equipped with a polymer float switch. Other characteristics:
- power - 810 W;
- productivity - 242 l / min;
- maximum immersion depth - 8 m;
- working pressure - 0.9 atm .;
- head - 9 m;
- diameter of dirty particles - up to 35 mm;
- cable length - 10 m.
The pump weighs 4.9 kg. The device is covered by a 3-year factory warranty.
PND-950
The model is available in black and gray. Working parameters:
- power - 950 W;
- productivity - 18 m3 / hour;
- head - 12 m;
- immersion depth - 5 m;
Like all other variants of Stavr devices, this modification is subject to a 3-year factory warranty.
Model NPD-1100M
The most powerful model of the device, the body of which is made of steel. Specifications PND-1100M:
- power - 1100 W;
- immersion depth - 8 m;
- maximum allowable pressure - 1 atm .;
- head - 10 m;
- productivity - 267 l / min;
- impurity size - up to 35 mm;
- cable length - 10 m.
The pump weighs 5.7 kg. Factory warranty - 3 years.
Advantages and disadvantages
Stavr pumps are appreciated by craftsmen for such positive aspects:
- compactness, ease of installation;
- pump mobility;
- good performance for private farm conditions;
- low noise level;
- economical consumption of electricity;
- profitable price.
Relative disadvantages include only the polymer case for some models. The plastic may crack under difficult conditions.
How to choose a model
The drainage submersible pump is selected according to the following criteria:
- Working conditions. Here you need to take into account the maximum possible temperature of the pumped water and the size of impurities in it.
- The productivity of the device. The higher it is, the faster the pump will pump out dirty liquid, but will consume more energy. For households, the optimal power indicator is 1.5 kW.
- Model's pressure. It is calculated by the formula: lifting height of liquid x abduction distance x 0.1 (coefficient)... The height is taken as the difference between the point of the discharge level and the lower boundary of the submerged apparatus.
The maximum immersion depth of the device should also be taken into account.
Installation features
The installation of the Stavr drainage pump must be carried out taking into account the following rules and recommendations:
- The drain hose must be securely fastened. Otherwise, there is a high risk of hose breakage under pressure.
- In the presence of a three-phase motor, the phases are connected in series, monitoring the direction of rotation of the impeller. If it turns counterclockwise, the order of connection of each phase should be changed.
- The pump is only installed vertically.
- Its launch is carried out exclusively in water.
To collect the liquid, you need to immediately prepare a volumetric tank or organize a safe discharge site (ravine, country roads, etc.).
Testimonials
Judging by the reviews of the Stavr submersible drainage pump, each of the models is recognized by the masters.
Anatoly, 41 years old. I bought a Stavr-450 pump for the dacha, since it is often necessary to remove water from the basement flooded in the spring (the dacha is at the bottom of the village and by the river). The unit works well. I have been using it for the second year. Removes water up to 2 mm. We collect the rest with a scoop and a rag. Advice - it is better to use reinforced hoses to pump out dirty water.
Cyril, 31 years old. Pump Stavr PND-810 bought this summer. It was assumed that with the help of the device I would supply water from the rate for irrigation. The unit is working reliably. The distance from the pond to the garden 7 meters easily overcomes. Doesn't make much noise. I like everything so far.
I bought a stavr npd 950 n in 2018 I already use everything perfectly I took it for pumping from the sewer with knives it pumps 50 meters along the sleeves it is a pity that it is impossible to leave it in the well when filling it is bad that the lower body of cast iron or iron is not clear, it rusts, and so everything is done with high quality without any complaints !!!!!