One of the main and most persistent problems that occur in sewage pumping installations is the presence of solids. Regardless of the kind of pumps used, there is a constant risk of clogging of the pumps' hydraulic system, which causes an emergency in the pumping station. Especially troublesome are here solid elements in the form of strings, rags, bandages, etc. carried by sewage. Using 'clogless rotor', free-flow pumps will always involve a drop in hydraulic efficiency, which will result in increased cost of maintenance of the pumping station. Using a pumping station with separation of solids allows to effectively avoid above-mentioned and other problems that occur in sewage pumping systems.
The main advantages of the sewage pumping station include:
reduction to a minimum of occurrences of emergencies caused by clogging of pumps by solid materials from sewage (long and dragging),
minimising of the risk of damaging the hydraulic system of the pumps (separation of solids before the pump),
using high-efficiency pumps allows to use engines with less power,
building a sewage pumping station in a dry chamber definitely improves the comfort of conducted maintenance and repair work,
lower capacities of tanks prevent sewage decomposition and production of unpleasant odours (more frequent activation of pumps).
TS sewage pumps can be used in any sewage system. By analysing in detail their advantages, they can be recommended for use in the following areas:
pumping within a large range of pressure of inflowing sewage,
places where high elevation is required,
sewage systems where large quantities of dragged materials appear, e.g. hospitals, hotels, holiday resorts, etc.
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Type TSC sewage pumping station with solids separation system TSC
Sewage pumping stations with solids separation system TSC type are characterized by effi cient work and greater freedom of
operation. Cost optimization achieved thanks to the construction with modern design allows for installation of the equipment
in tanks with smaller diameters suitable for “dry installation” and increases space for its maintenance.
Friendly installation and operating system of sewage pumping station with separation of solids is achieved thanks to using
such elements as movable fl ange on the infl ow side and using appropriate fi ttings. Th e elbow between the pump and the separator
allows for the access to the separator without dismantling of the pump and using shut-off valves before the separator
and pumps allow for conducting maintenance work without switching the sewage pumping station with solids separation
system off service.
Th e advantages of sewage pumping station with solids separation system TSC type:
direct access to the separator without dismantling of the pump,
shut-off valves before separators and pumps allowing to conduct maintenance work without switching the sewage pumping station off service,
increasing the space for maintenance work and easier access to separators and shut-off valves,
additional fl oat allowing for alternative control even in the case of probe failure.
Construction
A TS sewage pumping station is a complete, fully automated device that consists of the following components:
collector tank,
separation tank,
two separators - bar basket, flaps,
two pumps with a high-efficiency channel impeller,
hydraulic equipment elements, i.e. flanges, T-connectors, elbows, SHUSTER system ball check valves, connectors, knife gate, etc.,
ultrasound level gauge,
safety and control device.
The sewage pumping station tank, depending on the size type, is made entirely of austenite steel or austenite steel and plastic. Separators, flanges, T-connectors and connecting elements are made of austenite steel of high corrosion resistance to sewage effects. The structure and materials of other elements of hydraulic equipment (check valves, gates, pumps) make them resistant to sewage effects. In construction of sewage pumping stations were used SZUSTER check valves that ensure reliable and effective transport of sewage containing solids on the stretch gravitational collector - separators.
The valve ball (when fully open) tightly closes the bent valve duct, which ensures :
very high resistance of the valve to solid pollutions, because during flow the valve works like a regular elbow,
free clearance for solids, from the flow speed of 0.7 m/s, without causing vibrations of the ball, which is impossible to achieve with classic valve constructions.
The structure of the sewage pumping station was designed so that access to its basic elements (pump, separators) for conducting repair or service work could be possible without the need to break its operation.
The structure of the sewage pumping station was designed so that access to its basic elements (pump, separators) for conducting repair or service work could be possible without the need to break its operation. The sewage pumping station is equipped with two FZB pumps working alternatively, with a high-efficiency hydraulic system and a movement-durable drive transmission. Because for driving FZB pumps were used classic high-efficiency electric motors with fan cooling and an additional separation oil chamber was used between the pump and the driving motor, operation values of these pump machines could be improved.
In the classic (wet) pumping station, sewage supplied through a gravitation duct flow directly into a retention tank. In pumping stations with separation of solids, sewage flows into a pumping station housed in a dry chamber, then distributed into individual separators. From separators, partly treated sewage, without solids, sediments and dragged elements flows gravitationally through hydraulic elements of pumps into the pumping station's tank. In the case when any of the pump is working, sewage flows only into the separator connected with the idle pump. Preset sewage levels in the stations tank are controlled with an ultrasound gauge (optional use of other types of sensors). The safety and control device, after receiving a signal that preset sewage levels in the tank have been achieved, activates or stops proper appropriate pumps. The activated pump sucks in partly treated sewage and forces it into the separator located on the axis of the pressure switch of the pump. The energy of the stream of sewage being pumped carries solids from the separator and takes them to the pressure pipeline of the pumping station. Excess pressure produced during pumping closes back flow of sewage into the stations tank. During the pump's working cycle, sewage flows into the tank through the second separator and hydraulic system of the idle pump. After achieving the lower preset sewage level in the tank, the pump switches off automatically. The separator's construction (a special rod cage system) enables the pumping station to work in a constant way that does not require the implementation of additional operations of removing accumulated impurities. During every start of the pump, the separator performs a 'self-cleaning' procedure. The hydraulic system of the pumps, which does not have direct contact with solids, and especially dragged materials, is not exposed to clogging.
Filling stage
Pumping stage
Power supply and control
Power supply and control of a TS sewage pumping station is performed by a safety and control device UZS.8. Basic power comes from the electric grid. As backup, after switching electric power modes, the system can be powered from a current-generating unit with an adequate power. UZS.8 has the following protections:
shorting protection from effects of short circuits in winding of the engine and supply cables
overload protection from effects of current overload
protection from non-full phase and power asymmetry
protection from power voltage drop
protection from "dry" operation.
The whole of the system is controlled by a microprocessor SZH-2 driver (it is possible to use other controller). This controller is a modern electronic device that automatically controls the work of pump units installed in the sewage pumping station. The pump units work alternately. In the case of an intensive inflow of sewage into the station, two or three pumps are activated. A safety was used that prevents simultaneous activation of two pump units, in order to avoid overloading the power grid. Control of pump units is conducted according to a programmed algorithm. The immediate signals for the execution of consecutive stages of the process are impulses from an ultrasound probe, measuring sewage level. The controller's software enables sending proper signals to a remote supervision system. This enables sending messages or visualisation of the work of the sewage pumping station.
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Certification
According to guidelines of the European Union, sewage pumping stations are subject to the following directives: the building products directive (89/106/EWG), the machine directive (98/37/WE), the low-voltage directive (73/23/EWG) and the electromagnetic directive (89/336/EWG). TS sewage pumping stations fulfill the requirements, certified with WE tests conducted by a notified entity, of norm PN-EN 12050-1:2001 "Pumping sewage in buildings and their vicinity. Principles of construction and testing. Part 1: Pumping stations for sewage containing faeces" and PN-EN 12050-4:2001 " Check valves for pumping sewage without faeces and with faeces", norms harmonised with directive 89/106/EEC.
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