Trading and engineering company focusing on process pumps
In the spring of 2021, Copenhagen pump entered into a collaboration project with the Danish Nature Agency (NST) to modify a pump well with a new dry-installed self-priming pump technology.
The technology consists of the Varisco self-priming centrifugal pump, a Kostahl integral motor and a Dinel ultrasonic transmitter and coding.
The advantage of the Copenhagen Pump solution is that the pump is an easily accessible pump where all technology is mounted at "eye level" and not buried at the bottom of a well. Service thus becomes far simpler and more pleasant to deal with.
The water from the drained areas has a very high content of ochre that precipitates, partly in the drainage pipe system and partly by centrifugal force in the pump. As a result, ochre blocked and precipitated over a short period of time in the previous pump solution, often resulting in breakdowns. The Varisco pump is far more solid in its construction. With experience from other applications, the expectation is that any precipitation can be cleaned more easily by flushing.
The pump is driven modulating using the VFI's PI setup aided by a Dinel ultrasonic transmitter, in our case for the "constant level" application.
Energy consumption and service:
Energy consumption is expected to remain relatively low, despite the (in this case) 7.5 kW electric motor, the pump consumes no more than 0.5 kW at 20 Hz on a November day in 2021. At the same time, there is a huge capacity available.
Construction costs:
It is our assessment that the construction costs are comparable to a submerged pump solution, provided that the dry top pump solution is chosen from the start.
Retrofitting existing submerged solutions still makes a lot of sense, as subsequent maintenance relief still outweighs and repays future maintenance.
About re-wilding.
Large parts of Denmark are reclaimed drained areas based on the Dutch model. The areas are therefore low and some even below sea level, protected by dikes and pumps. In this case, it is the drainage water from the crop rotation area that creates value by contributing to a new higher-lying wetland at sea level. Thus (according to Bernoulli's equation) no more energy is consumed and no more Co2 is emitted than the area's original total energy and Co2 load. The water is just allowed to benefit biodiversity before it naturally reaches the sea. The results of the Danish Nature Agency's re-wilding project have proven to be very effective in just a few years. During the planning phase, commissioning and subsequent supervision of the project, we have not been able to avoid feeling like a lucky guest in nature.
In the you tube video below, Engineer Thorbjørn Schrøder explains the case and the construction and operation of the system. Pay special attention to how quiet the entire arrangement is before the envelope is installed.
Parties:
The Danish Nature Agency by Morten Elling (biologist)
Contractor Skak Gaarde
Copenhagen Pump by Thorbjørn Schrøder 50174018 ths@summit.dk
Summit Electronics by Henrik Rødtnes hr@summit.dk
