In some applications, the pump may be permanently, or may occasionally be, below the level of the water it is to pump. (Non-contractual photo, does not necessarily reflect the drawing)
In some applications, the pump may be permanently, or may occasionally be, below the level of the water it is to pump.
This is the case, for example, for cell and basement exhaustion pumps that run the risk of flooding, or pumps placed at the edge of a watercourse that overflows frequently.
It is then necessary to use a pumping assembly perfectly sealed. In this case, the electric motor is required. It is then a sealed motor, powered by a circuit under pipes also sealed. There are pumps that start automatically under the action of a float switch as soon as the water submerges them.
When the volume to be exhausted is very important, we can however design a submersible pump with a heat engine. But the installation becomes very complex, since the engine must be placed in a waterproof box, with ventilation chimney for the intake of air of supply and cooling, and evacuation of the exhaust gases. Engines used for these groups are usually derived from outboard marine engines.
It is rare for the individual to be equipped with a pump that can always work underwater. The most frequent case concerns the evacuation of water invading a low point: cellar, basement, ground of ground. This evacuation must be able to be carried out automatically, as soon as the water reaches a critical level, even out of any human intervention. In this type of application, you need a very high flow pump, in order to exhaust the excess water as quickly as possible to limit the damage of the flood.
On the other hand, suction height is, by definition, practically zeroor even negative, which solves the boot problem. But the length of the drain piping can be important, in order to eject the water drawn far enough so that it does not return to flood the area protected by the pump. The triggering of the pump is controlled by a float device, set to control the start of the engine as soon as the water reaches a critical level.
A particular version of the submerged pump, due to its principle of construction, the floating pump can render many services to the owner of a second home. It may also interest the user of a caravan or motorhome.
A floating pump consists of a totally sealed pumping unit, fixed on a floating support, usually made with a small box filled with polyurethane foam. A suction strainer is placed under the box.
It is needed in a number of specific cases, but its many qualities make it adopted by a growing number of users.
Its main advantage is to allow the water to be pumped more than 8 m deep, which is impossible with a conventional overhead pump. It is known that, contrary to aspiration, repression is not limited. By placing a pump in the water, we can theoretically push it to an indeterminate height. The submerged pump is therefore particularly suitable for very deep wells, but it also has the advantage of solve the problem of noise and especially the gelsince it is submerged and placed deep in the ground, it will not freeze.
Finally, the submerged pump is satisfied with a borehole of small diameter (40 cm), which exempts the digging of a real well, always very expensive.
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