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Monthly Archives: March 2018

  • How do drainage pumps work?

    drainage pumps

    Drainage pumps are often installed to move waste-water from a range of domestic and industrial sites, including private housing, farmland, and construction sites. They deal in underground dewatering, usually when gravity can't be applied to move the water (in this respect a drainage pump is similar to a sewage pump). What a drainage pump does is effectively ‘what it says on the tin', however, how they do it is a different matter entirely. This article aims to introduce the how's and why's of non-submersible and submersible drainage pumps.  

    Non-Submersible Drainage Pumps

    A non-submersible drainage pump is not placed directly in water; instead, it uses suction hoses and permanent pipework to transport the waste-water from the unwanted location. This type of drainage pump is often used when pumping waste-water from ponds, and other mobile drainage requirements.

    Submersible Drainage Pumps

    The reputable pump manufacturer Grundfos defines the submersible pump as "an enclosed unit with a close coupled pump and motor, due to its construction, the pumps are suitable for submersible installations – designed to be partially or completely immersed in water."

    A submersible drainage pump will collect water from the base of the unit and transport the water up and out of the system and include a no return valve to ensure there is no potentially damaging backflow. To use the ABS Coronada 250W-SX as an example, it is optimised to work when submerged in several ways. Firstly, the unit is encased in corrosion resistant stainless steel which is vital for the products durability – the model is also equipped with thermal sensors in the motor to prevent overheating. The Coronada is also equipped with the previously mentioned no return valve.

    The Calpeda GXRm 11 fits the similar purpose of draining rooms, water extraction, and can also clean water containing solids of up to 10mm in size. Its operating systems differ in various ways from the Coronada, for example in the Calpeda the motor is cooled by the water passing between the motor jacket and external jacket. However, both jackets are similarly corrosion proof – making both these submersible drainage pumps excellent units for domestic use.  

    Submersible Drainage Pumps & Industrial Use

    An industrial site naturally includes different working conditions when compared to the domestic setting – the Trencher T400F automatic submersible drainage pump is an excellent example to consider concerning industrial conditions.

    Whilst this pump is undoubtedly suited to a residential environment, what makes it uniquely suited to industrial sites is its adept handling of water supply from lakes and rivers. The Trencher is excellent when dealing with sediment removal thanks to its high abrasive resistance resin vortex impeller– which is something more common in industrial sites that often handle raw materials, thus this feature is less likely to be needed in a suburban estate.

    Every pump adheres to its specifications and operating systems, they often share a common purpose but when looking at the ‘how', one must look carefully at the detailed specification pdf's that are regularly available to select the correct drainage pump for you.

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