Here at Dutypoint, we understand that navigating the complexities of pump station sizing and selection can be daunting. With decades of experience, since 1976, as the UK’s top provider of fluid technology solutions, we’ve learned that a well-designed pump station is crucial for efficient and reliable stormwater and wastewater management. We’re committed to providing not just products, but also the expertise and support you need to make informed decisions.
Article Guide
- Why Are Pump Stations Needed?
- Sizing and Selecting the Right Pump Station
- Understanding Pump Impeller Types
- Vortech™ Packaged Pumping Stations
- Ensuring Optimal Performance and Longevity with Dutypoint
- Pump Station FAQs
Why Are Pump Stations Needed?
Why are pump stations needed? This is a question we frequently encounter. Essentially, pump stations are indispensable when gravity alone cannot facilitate the movement of wastewater or stormwater. This typically occurs in several scenarios:
- No Gravity Method: When properties or sections of buildings sit below the mains sewer line, a pump station is necessary to move waste upward to the sewer system. This was precisely the case at Allscott Meads, where the site’s insufficient natural fall made gravity drainage unfeasible, requiring a bespoke adoptable sewage pumping station to transport waste to the mains.
- Restricted Outflow: Some sites require controlled discharge rates to prevent overwhelming existing sewer infrastructure. This was demonstrated at the A43 Moulton Bypass (Phase 1B), where Dutypoint engineered a stormwater pump station with flow restrictions to ensure the discharge rates aligned with the downstream network’s capacity, preventing overload.
- Attenuation Needs: Where large volumes of water need temporary storage before controlled release, pump stations help manage the flow rate. For example, a Sainsbury’s Superstore in Aylesbury, had high-capacity pump stations installed to manage peak wastewater output and ensure a controlled discharge into the local sewer system.
- Long-Distance Transport: When properties are far from the nearest gravity sewer, a pump station is required to bridge the gap efficiently. At the Project Mary distribution centre in Avonmouth, Dutypoint supplied five strategically placed sewage pump stations to move waste across the expansive site, overcoming significant distances to reach the mains sewer.
These systems ensure that regardless of geographical or infrastructural challenges, efficient fluid management is achievable.
Sizing and Selecting the Right Pump Station
How to size a pump station, and how to select the right one, are critical questions that demand precise answers. At Dutypoint, we’ve observed that many common pump station problems stem from incorrect product selection, often due to improper pipework sizing, inadequate storage, or incorrect pump sizing. Improper pump sizing and selection, leads to inefficiencies, frequent breakdowns, and costly maintenance. To mitigate these issues and ensure optimal performance, it’s vital to consider several factors during the sizing and selection process:
1. Type of Medium Being Pumped: First and foremost, the type of medium to be pumped must be determined. Is it stormwater, foul sewage, or a combination? This distinction is crucial as it dictates the type of pump and impeller required. For instance, stormwater and foul sewage often benefit from vortex impellers, while foul sewage might necessitate macerator or heavy-duty chopper impellers.
2. Application Type: The application also plays a significant role. Whether it’s a domestic setting (single or multiple dwellings), a commercial or industrial facility, infrastructure project, hotel, hospital, or even a car park, each scenario has unique demands. For example, a hospital requires a robust and reliable pump system to allow continuous operation and sustain critical hygiene standards.
3. Rising Main Design Considerations: The level at which the rising main sits (the pipe carrying wastewater from the pump station to the sewer), both in the pump station and the outfall chamber, is another crucial consideration. Critical considerations regarding the design of the rising main include:
- Ideal Velocity: Should be between 0.75 m/s and 2.5 m/s to prevent sludge build-up and excessive wear.
- Continuous Rise: Ideally, the rising main should continuously rise between the pump chamber and outfall. However, when this isn’t feasible, minimising rises and falls is essential to prevent sludge buildup and air pockets.
- Air Valves & Washout Chambers: Blockages can be further mitigated by installing air valves at high points and washout chambers at low points.
Calculating rising main velocity is essential for optimal pump station performance. We recommend maintaining an ideal velocity to prevent silting up or excessive wear. For detailed guidance, refer to our knowledge section on rising main calculations.
4. Storage Requirements: Similarly, calculating pump station storage and emergency storage needs is vital. Proper storage capacity prevents flooding and ensures the pump operates efficiently. British Water loading units should be considered, particularly if the station is next to a building. Finally, the inlet pipe should be positioned above the emergency storage area to avoid backflow.
Understanding Pump Impeller Types
Choosing the correct pump impeller is paramount, some of the key pump impellers and their applications include:
- Vortex Impeller: Best for stormwater and foul water applications; allows solids to pass without clogging.
- Channel Impeller: Ideal for surface water applications with low solids content.
- Macerator Impeller: Used for foul and sewage water, breaking down solids into smaller particles.
- Heavy-Duty Chopper Impeller: Designed for challenging applications like industrial waste and abattoir discharge.
Dutypoint offers a variety of tank solutions tailored to different needs, making it easier to choose the right pump station tank:
- Poly Tanks (Vortech™ Range): Lightweight yet durable polyethylene chambers, easy to install and maintain.
- GRP Tanks (EnviroGUARD): Suitable for larger applications, available in horizontal and vertical configurations.
- Bespoke Pump Solutions: Tailored pump station designs for unique project requirements.
The Dutypoint Advantage: Vortech™ Packaged Pumping Stations
Within our extensive range of pumps, Dutypoint’s Vortech™ pumps stand out for their versatility and reliability in handling both stormwater and foul sewage. The design of a vortex impeller minimises direct contact with the pumped liquid, significantly reducing wear and tear. This not only extends the lifespan of the pump but also ensures consistent waste management even in demanding applications. Their efficiency and durability make Dutypoint’s Vortech™ range a trusted waste management solution for projects where reliability is critical.
Benefits of Dutypoint’s Vortech™ Packaged Pumping Stations:
- All-in-one packaged system: Simplified installation, reducing site disruption.
- Easy Installation: Pre-configuration of inlets specified at purchase to align with existing pipework allowing for easy installation.
- Versatile Sizing: Capacity from 280 L to 9,000 L, ensuring suitability for small domestic setups to large commercial projects.
- High-Quality Materials: Constructed from durable, corrosion-resistant virgin polyethylene.
- Reliable Performance: Comes with high-quality submersible and macerator pumps for various applications.
- Advanced Features: High-level alarm, guide-rail system for easy maintenance, and control panel for seamless operation.
- 25-year manufacturer’s warranty: Ensuring long-term reliability and cost-effectiveness.
Case Study: Reliable Sewage Pumping at Allscott Meads
An example of Dutypoint’s expertise in action is the Allscott Meads development in Telford, where a significant residential project faced a challenge common to many new-build sites: an insufficient natural fall to connect to the mains sewer via gravity. This made the No Gravity Method essential, requiring a reliable pump station to move wastewater from low-lying areas up to the existing sewer network.
Dutypoint provided a bespoke adoptable sewage pumping station using our Vortech™ packaged system, specifically selected for its robust polyethylene construction and compatibility with Severn Trent Water adoption standards. The Vortech™ system was chosen for its ease of installation, long service life, and ability to handle foul water with solid content from multiple domestic dwellings.
Pump Stations: Ensuring Optimal Performance and Longevity
In summary, to get the most from a pump station, regular maintenance is key:
- Check impeller conditions regularly to prevent blockages.
- Inspect air valves and washout chambers to ensure smooth flow.
- Monitor alarm systems to catch issues before they escalate.
- Use the Dutypoint Pump Selection Form to get expert guidance for your specific project needs, such as ensuring correct sizing and selection.
Ensuring Optimal Performance and Longevity with Dutypoint
If you’re unsure about which pump station is right for your project, Dutypoint’s experts are here to help. Contact us today or download our Big Amber Book, packed with industry-leading wastewater pump systems and technology.
Pump Stations: Frequently Asked Questions
Why are pump stations needed in properties below the mains sewer line? Pump stations are crucial to elevate wastewater to the mains sewer when gravity flow is insufficient, preventing sewage backups and ensuring proper drainage.
What are common pump station problems to avoid? The most common issues come from poor sizing, incorrect impeller type, inadequate storage, and rising mains with improper velocity or layout. These lead to blockages, wear, and costly breakdowns.
What factors should I consider when sizing a pump station? Pump station sizing depends on the application, the volume of water, and how far and high the liquid needs to be pumped. Accurate rising main and storage calculations are key to preventing flooding and ensuring efficiency.
How do I calculate rising main velocity? Use Dutypoint’s knowledge section or Pump Selection Form to determine the ideal rising main velocity, typically between 0.75 m/s and 2.5 m/s, to minimise sludge build-up and maximise efficiency.
What is the British Water loading unit, and why does it matter? British Water loading units help calculate correct storage volumes, especially when a pumping station is near buildings. It ensures flood risk is reduced and emergency storage is correctly positioned.
What’s the difference between stormwater and sewage pump stations? Stormwater pump stations handle runoff from rain and clean water sources, while sewage (or foul water) stations deal with waste from toilets, sinks, and industrial processes, requiring pumps that can handle solids.
Which type of impeller is best for foul sewage? Macerator or heavy-duty chopper impellers are best for foul sewage, as they break down solids to prevent clogging.
What are air valves and washout chambers, and why are they needed? Air valves and washout chambers prevent sludge buildup and air pockets in rising mains, ensuring smooth, efficient flow.
How often should a pump station be maintained? Regular maintenance, including impeller checks, air valve inspections, and alarm system monitoring, is crucial for optimal performance and longevity.
What is a poly tank, and when should I use one? Poly tanks, such as those in our Vortech™ range, are made from high-density polyethylene. They are ideal for domestic and small commercial applications due to their light weight, corrosion resistance, and ease of installation.
What is the benefit of a vortex impeller? Vortex impellers are ideal for applications with high solids content, as they minimise contact with the pumped liquid, reducing wear and clogging.
What are the benefits of Dutypoint’s Vortech™ packaged pumping stations? Dutypoint’s Vortech™ stations offer easy installation, versatile sizing, durable construction, reliable performance, and advanced operational features.
Can Dutypoint provide bespoke pump station solutions? Yes, Dutypoint specialises in tailored pump station designs to meet unique project requirements, ensuring optimal performance and compliance.
