Sewage Lifting Station

Sewage Lifting Station:

What is a Sewage Lifting Station?

 

A sewage lifting station is another term for a sewpage pumping station.

It is made up of a large tank (known as a wet well) that acts as the receiver for sewage from a building or a group of buildings. Sewage from individual houses flows into the wet well.

The sewage then sits in the well until it reaches a predetermined level. Once it reaches this level, a pump will kick in to pressurise the sewage so that it will travel out of the wet well, uphill, to a point where it enters the main sewer, or that it can then travel into the main sewer using gravity.

 

sewage lifting station

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Sewage Lifting Station

Sewage Lifting Station

Price £1,412.00 + Delivery + VAT!

Specifications

  1. These units are fully compliant to BS EN 12050, BS EN 752-6 and Building Regulations Approved Document H.
  2. This unit has Oliju F50-075 heavy duty submersible sewage pumps featuring a 50mm outlet, Vortex impeller with 50mm solids handling, cast iron and stainless steel construction 230 volt single phase. 7 litres per second maximum flow, 12 metres maximum head. SUPPLIED WITH A 5 YEAR CONDITIONAL WARRANTY
  3. Pre-glanded, manual change-over switching unit.
  4. Battery operated basic high-level alarm unit with 10m floatswitch and counterweight.
  5. Completely maintenance-free, transparent PVC, full-flow, non-return flap valves.
  6. Extended lugs on discharge stools and top brackets, ensure guide-rails won’t fall off, and “floating” guide-rails allow movement should minor ground changes flex the base of the tank.
  7. Light-weight, corrosion resistant, PVC guide-rails.
  8. Single guide-rail per discharge stool prevents claw from coming off (common occurrence when twin rails flex together); Top brackets can easily be affixed into a round tank access opening as the pump can be rotated initially through 180 degrees before final coupling onto discharge stool.
  9. Assembled onto fibreglass grating requiring only minimal holes for fixing assembly onto base of tank (normally 8 holes are required/drilled to accommodate 2x discharge stools, and more holes are more likely to leak).
  10. Holesaw & arbor and 2 rubber 4” inlet/duct sockets for self-drilling/self-fitting to suit site levels.
  11. 1 x 63mm ‘Plasson’/MDPE discharge pipe coupling (other options, e.g. hosetail & clip available at no extra cost).
  12. Access Cover & frame included, to suit opening aperture of tank selected.Galvanised steel or plastic, depending upon tank model.Heavier duty versions available from stock at extra cost.
  13. Floatswitch glanded into each pump respectively, providing automatic operation. (Use the manual change-over switch to alternate duty on a weekly basis or upon pump failure).
  14. High quality, corrosion resistant, galvanised steel, pump lifting chains.
  15. Flexible discharge hose used within tank allows movement should minor ground changes flex the base of the tank.
  16. Corrosion resistant, 4-way, float suspension hook bracket.
  17. Corrosion resistant, high quality, PVC, Slide Valve/Service Valve.

What is the difference between a sewage lifting station and a sewage pumping station?

Sewage pumping stations & sewage lifting station are two very similar, but different systems.

The lifting station is specifically designed for the pumping of waste or sewage material to a higher elevation. This is in contrast to the sewage pumping station, which is designed to raise water, not sewage, to a higher elevation. They are completely different in the material they contain and move, so it’s important to not get the 2 systems mixed up with each other.

Sewage Lift Station

There are special considerations that must be addressed in the design of the lift station as sewage presents unique problems (as opposed to just pumping of water). Some of these are:

  • Sewage has water intermixed with various solids and often has stringy debris that would clog a typical impeller, requiring grinder type pumps.
  • The sewage also generates various poisonous gases and the storage basin must be treated as a hazardous location.
  • In order to prevent the pump from frequent cycling there needs to be a range of levels that start the pump and then stop the pump, in some cases requiring more than one pump.
  • The “dead” time that a pump is off should not be so long as to allow the sewage to become septic. When it becomes septic (which is a condition of putrefaction) it becomes hazardous waste and could need to be managed differently. This may sound odd for sewer effluent but it is a serious condition.
  • In today’s designs the pump and motors are generally of the submersible type, thus solving many of the problems of isolating the motor and pump from the sewage environment.

The electrical system and controls must be isolated from the effects of the contamination of sewage and weather. Many modern control systems also include electronic monitoring systems that are sent to a centralized location. Here the operational status, as well as any alarms, can be conveniently monitored.

The lift station can range from a small in-home station where the motor is a fractional horse power motor, to a municipality where the system has several large horse power motors with built-in redundancy that helps minimize the consequences of pump failures.

Required controls generally include:

  • high water alarms,
  • alternating pumps controls (called a Lead-Lag system) and
  • indicators for any power loss to the controls or the station.

Sewage Pumping Station

A pumping station has its own set of considerations that need to be addressed in its design.

In general they involves moving large quantities of water, whether that is water from a storm management system or a reclaimed water system from a water softener or condenser. Some pumping stations operate on a constant basis and others on an infrequent basis. Those that operate on a constant basis may be the type that move water from drainage areas or diked systems to higher levels. These types must consider the effects of rainfall on the pumping requirements. For example, a pumping station in Florida, where they get an average of fifty inches of rainfall annually, would see far more operating time then say Phoenix, Arizona that gets only about eight inches annually, on average. There have been cases where rainfall has reached levels of 15 to 20 inches over a few hours. When this is a possibility appropriate pump sizing and/or redundancy is a critical aspect of the operational consideration of system design.

The pumping stations that are designed to operate on an infrequent basis have their own set of design challenges. Namely, the float switch material used on the float to activate the pumping station can deteriorate over time when not in use. This can result in the failure of the entire pumping station to activate, causing unwanted flooding. An example is when pumping is required during excessive rainfall in a localized area, such as a low laying neighborhood or roadway and the pumps do not activate. The requirements for this system involve special considerations as the need for the pumps to become active may occur only once very few years in a dry area like Arizona. The problem now becomes one of maintenance and performance verification. When pumping or other systems remain inactive for long periods of time there are also corrosion and seal deterioration issues that are difficult to test, unless a full scale operation is conducted. This presents its own set of challenges to the maintenance staff. In addition, when the issue is excessive rainfall, the pumping of the water must be to a location that will not exasperate the situation.
Principally, the controls for either the list station or the pumping station operate in much the same manner, including alarms and pump cycling. The difference between them is found in the code requirements for the ‘Authority Having Jurisdiction’. Those codes can vary widely from city to city and state to state so always consult your local authority having jurisdiction.

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Free UK mainland delivery on all orders over £200

PUMP STATION SERVICING

Regular servicing and 24/7 emergency call-outs

Sewage Lifting Stations Range Available

Off the shelf as well as bespoke solutions.

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