Centrifugal, submersible, and positive-displacement pump manufacturers for water and wastewater duty.

    Find a Water Pump Provider

    Matched providers: 14

    Top countries: United Kingdom, Indonesia

    Popular technologies: Acid Dosing Systems, Aerated Lagoons, MABR

    Pump Selection, Hydraulic Design, and Performance Standards for Water and Wastewater Applications

    Pump selection for water and wastewater applications requires matching the pump hydraulic performance curve (head-flow, H-Q) to the system curve (static head plus friction losses). Key pump types: centrifugal (radial, mixed-flow, axial) for low-to-high flow at moderate-to-low head; positive displacement (reciprocating plunger, progressive cavity, peristaltic) for high-viscosity, high-pressure, or metering duties; submersible borehole pumps (multi-stage radial, 4-inch to 24-inch diameter, 100 to 3,000 L/min); end-suction and split-case centrifugal (ISO 9906 performance certification, Class 1 or 2); and axial flow propeller pumps (high flow, low head, 1,000 to 50,000 L/s in flood pumping stations). Duty point selection requires adequate Net Positive Suction Head Available (NPSHa) exceeding NPSHr by a minimum safety margin of 0.5 to 1.0 m per ISO 9906. Pump efficiency at duty point should exceed 65 to 75 percent minimum for large-scale applications; EU ErP Minimum Efficiency Index (MEI) of greater than or equal to 0.4 applies to water pumps 0.75 to 150 kW under Regulation 547/2012.

    Variable speed drives (VSDs, also variable frequency drives, VFDs) are applied to centrifugal pumps to modulate flow and pressure with substantially reduced energy consumption. Affinity laws: flow varies proportional to speed (Q2/Q1 = N2/N1); head varies as square of speed (H2/H1 = (N2/N1)2); power varies as cube of speed (P2/P1 = (N2/N1)3) - a 20 percent speed reduction reduces power by 49 percent. VSD retrofits typically achieve 20 to 50 percent energy savings in pumping systems with variable demand profiles (water distribution, HVAC). VSD efficiency: modern IGBT-based drives achieve 97 to 98 percent efficiency at full load; at 50 percent speed, combined motor-drive efficiency remains above 85 percent. Harmonic distortion from VSDs (IEEE 519-2014 THD limits: less than 5 percent voltage THD at point of common coupling) requires harmonic filters or 12-pulse rectifier configurations on large installations greater than 75 kW.

    Pump maintenance and lifecycle management: MTBF for submersible wastewater pumps is typically 15,000 to 25,000 hours (7 to 12 years continuous operation); mechanical seal life 5,000 to 15,000 hours depending on solids content and abrasion. Condition monitoring technologies: vibration analysis (ISO 10816 velocity limits: less than 2.8 mm/s for Class I small pumps, less than 4.5 mm/s for Class II medium pumps at bearing housings); current signature analysis (CSA) detects rotor bar defects and impeller wear via motor current harmonics; online pressure pulsation analysis detects cavitation and recirculation. Pump testing: ISO 9906:2012 specifies factory acceptance test (FAT) tolerances: efficiency tolerance minus 3 percent for Class 1, minus 5 percent for Class 2; flow tolerance plus or minus 4 percent (Class 1). Site acceptance testing (SAT) conducted after installation at design duty points confirms system hydraulics. UK Water Industry standard PSSR 2000 (Pressure Systems Safety Regulations) and PED (Pressure Equipment Directive) apply to pressurised pump systems.

    Frequently Asked Questions

    How do I select the right pump for a water system?

    Pump selection follows a systematic process: (1) Define the duty point: required flow (L/s or m3/hr) and total dynamic head (TDH = static head + friction losses at design flow); (2) Plot the system curve (head vs flow for the pipeline); (3) Select pump type: centrifugal for most water/wastewater duties; positive displacement for metering, high viscosity, or high pressure greater than 100 bar; (4) Match pump H-Q curve to system curve: duty point should be at or near the pump's best efficiency point (BEP), ideally within 70 to 110 percent of BEP flow to avoid recirculation and cavitation; (5) Check NPSHa vs NPSHr: NPSHa must exceed NPSHr by 0.5 to 1.0 m; (6) Verify motor power at maximum flow on the H-Q curve (non-overloading characteristic preferred); (7) For variable demand: size for maximum duty, apply VSD for turndown. ISO 9906 Class 1 or 2 factory test certification should be specified for all critical pumps.

    What efficiency standards apply to water pumps?

    EU Regulation 547/2012 (implementing Ecodesign Directive for water pumps): sets Minimum Efficiency Index (MEI) requirements for clean water end-suction, multistage, submersible borehole, and circulators. MEI greater than or equal to 0.4 for water pumps 0.75 to 150 kW from January 2015; MEI greater than or equal to 0.7 from January 2017. MEI is a dimensionless index comparing pump efficiency at specific speed (Ns) against a reference: MEI 0.4 approximately equals 65 to 75 percent hydraulic efficiency for common pump sizes. US: DOE EISA 2007 Section 312 sets minimum efficiency standards for submersible turbine pumps and clean water centrifugal pumps. UK: retained EU Regulation 547/2012 post-Brexit via UKCA marking. Extended Product Approach (EPA) for pump plus motor plus drive systems uses Pump Energy Index (PEI) weighting efficiency across the operational range. ACEEE and Hydraulic Institute publish additional efficiency guidelines for large municipal pumps above the EU Regulation scope.

    When should variable speed drives be used on pumps?

    VSDs provide the greatest benefit when pump demand varies significantly over time. Key criteria: (1) System with variable demand: water distribution (daily demand variation 40 to 200 percent of average), HVAC cooling water (seasonal variation), irrigation (batch cycles) - VSD payback typically 1 to 4 years; (2) System head dominated by friction (not static head): affinity laws apply most beneficially when friction losses predominate; in high-static-head systems (borehole pumping against 100 m+ static head), VSD speed reduction saves less energy than expected because head is largely independent of flow; (3) Throttled valve control: existing systems with control valves wasting energy are prime VSD candidates; (4) Soft-start requirement: VSDs eliminate motor starting current surges (typically 600 to 800 percent of full-load current for DOL starting vs 100 to 150 percent for VSD ramp-up), reducing electrical system stress and extending motor life. VSD contraindications: pumps running at constant duty near BEP continuously (e.g. constant-flow industrial process) gain little from VSD and pay unnecessary conversion losses.

    What causes pump cavitation and how is it prevented?

    Cavitation occurs when local pressure in the pump falls below the liquid's vapour pressure, forming vapour bubbles that collapse violently (implosion pressure 100 to 1,000 bar locally) causing erosion, noise (crackling/gravel-like sound), vibration, and head/flow loss. Causes: (1) Insufficient NPSHa - high suction lift, long suction pipe, high fluid temperature, high altitude reducing atmospheric pressure; (2) Operating far above BEP (recirculation cavitation): internal recirculation at impeller inlet and discharge at flows greater than 115 percent BEP; (3) Vortex at suction bell/sump (entrained air); (4) System resonance creating pressure pulsations. Prevention: (1) Maintain NPSHa greater than NPSHr + 0.5 to 1.0 m safety margin (ANSI/HI 9.6.1 specifies required margin by pump type); (2) Reduce suction lift: submersible or wet-pit installation; (3) Oversize suction pipework (velocity less than 1.0 m/s at pump inlet); (4) Operate pump near BEP (70 to 110 percent flow range); (5) Sump design per ANSI/HI 9.8 (wet-pit dimensions, submergence, floor clearance) to prevent vortexing.

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    Water Pump Companies

    Centrifugal, submersible, and positive-displacement pump manufacturers for water and wastewater duty.

    14 providers

    This page is a good fit if you need:

    • Acid Dosing Systems or Aerated Lagoons, MABR capabilities
    • Suppliers with contractors sector experience
    • Providers operating in United Kingdom or Indonesia
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    Find a Water Pump Provider

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    Ecosystems International logo

    Ecosystems International

    Verified
    Indonesia51-200 employees
    Flat Sheet Microfiltration Units · Hollow Fiber MF Systems · Ceramic Microfiltration Modules +80 more
    apac · china · europe +3 more

    PT Ecosystems International (PT ESI) was established at Jakarta on 21st November 2006. We are an industrial effluent treatment systems integrator specializing in electrocoagulation (EC), a unique waste water treatment profile. PT ESI has capabilities in designing complete waste water treatment solutions by combining various effluent treatment systems such as the electro-coagulation, biological, chemical processes and membrane filtration, offering its customers a wide and comprehensive range of solutions, tailored to suit their various needs – ranging from basic effluent treatment for discharge to effluent recycling for water reuse. The Company is experienced in handling the design, engineering, procurement, construction and operation of new Effluent Treatment Plants (“ETP”) and possesses expertise in retrofitting existing ETP to increase the flow rate and treatment capability without any major infrastructure increase PT ESI is also a premier waste water treatment service company specializing in handling waste water generated from Exploration (Drilling) and Produced Water. Customers in Indonesia include major Oil & Gas companies such as Pertamina, Exxon, Chevron, Petro-China and Medco. Operations in Indonesia are provided by both mobile and fixed units. At drill sites where waste-water recycling is required, PT ESI supplement these treatment units with skid mounted mobile Reverse Osmosis systems. The technologies and solutions employed by PT ESI are developed in-house and examples of these are its proprietary Trident™ Electro Contaminant Removal (“ECR”) system, the Stage Contaminant Removal (“SCR”) process and Mobile On-Site Waste-Water Treatment (“OWT”) units

    Reverse Osmosis (RO) Systems
    Ultrafiltration (UF) Systems
    Multi-media Filtration (MMF) Systems
    +63 more
    agriculture
    manufacturing
    Industrial Pipework Services logo

    Industrial Pipework Services

    United Kingdom

    At Industrial Pipework Services, we provide bespoke engineering services. With over 25 years’ experience IPS can offer complete mechanical engineering solutions including design, manufacture & installation services. Our experienced workforce are trained to the highest standards. IPS is situated within easy access to the M4 corridor approximately 30 minutes North of Cardiff. The company embraces innovative thinking while utilising the latest technology. IPS operating base comprises of 30,000 square foot of workshops, offices and assembly areas.  The Workshops are fully segregated for the manufacture of both carbon steel and stainless-steel products and are serviced by dedicated overhead gantry cranes. With over two decades of engineering experience the company strives to combine first class engineering and design to deliver the high quality that is required.  The Company maintains a proactive approach, working closely with our Clients to achieve our collective aims for each scheme. This ambition is underpinned by an uncompromising commitment to attain the highest standards of health, safety and environmental care. IPS provides continued excellence in design, manufacturing and installation gained from many years experience within the industry. Our In-House design capability allows the company to provide a full engineering design service using the latest Auto CAD software packages. IPS offers a design service for both pipework and steelwork systems from proposal drawings to the production of as built drawings. IPS Design Office provides all relevant AutoCAD drawings for steelwork and pipework, Isometric drawings for fabrication, general layout drawings for plant and equipment and As Built drawings. Structural steelwork calculations and flow characteristics are also provided as required. IPS offer a full 3D surveying services and production of cloud point data for project modelling. IPS operates primarily within the Water Industry and provides services for both clean water and sewage. IPS is a Tier One Mechanical Engineering Specialists Provider to Dŵr Cymru Welsh Water and the Strategic Alliance. IPS operate nationally and have delivered projects throughout the UK for many Water Utility companies including Anglian Water, Thames Water and Bristol Water. Continual improvement into our infrastructure and the development of new IT systems has brought us to a level consistent with the requirements of our clients. IPS offers a complete project management service, including operation of Principal Contractor role as well as delivering turnkey projects. Experience gained in the water industry has enabled us to manage the competing demands of cost, quality and safety for all our projects.

    Networks - Water Supply
    Contractors
    PLR Building Services Ltd logo

    PLR Building Services Ltd

    United Kingdom

    Here at PLR Building Services, our team brings extensive experience in the water industry, specialising in top-tier electrical installation work for framework companies across the utility companies. Our primary focus is on ensuring compliance with regulatory requirements for water systems. We offer a comprehensive electrical design package and project management services. Our team is equipped with the latest health, safety, and electrical qualifications to meet all your project requirements efficiently. As a NICEIC approved contractor, we excel in both new systems installation and the refurbishment of existing installations. Water treatment Wastewater treatment Sludge treatment Pumping stations Reservoirs Inspection Testing Electrical Design Project managing

    Contractors
    Water Pumping Stations
    Intelect logo

    Intelect

    United Kingdom

    At Intelect, we have over 25 years experience in providing engineering expertise to clients in process industries. Intelect have worked with Northumbrian Water and its Tier 1 suppliers and partners for over a decade, and during this time, we have provided services in design, electrical installation, control panels and pipework services. Our attention to detail, quality, and attitude to Health and Safety has been consistently recognised by our clients over the years, with us receiving numerous awards for the projects we have completed. Our flexible workforce of apprentices, engineers and project managers allows us to efficiently complete any project to our client’s requirements. On-going innovation and investment in our business means that we have the latest training and technology to execute high quality engineering projects, from design through to commissioning, all whilst maintaining best practices in Health and Safety. Intelect are committed to working in partnership with both contractors and suppliers within the utility sector, sharing our expertise and knowledge to help support companies who provide utilities to homes and businesses across the North East and the rest of the country.

    Networks - Water Supply
    Contractors
    JK Fabrications Ltd logo

    JK Fabrications Ltd

    United Kingdom

    With over 30 years of experience delivering expertise in the industry, JK Fabrications Ltd has become one of the front runners and will keep challenging ourselves and others to improve our Environment as we believe that; Our Environment, is our Future. At JK Fabrications, we are an engineering company that takes pride in our family roots, with an aim to continue to successfully grow our business. Our company values are incorporated into everything we carry out and we seek to work with like-minded companies. Established in 1998, JK Fabrications specialises in efficent, effective, and environmentally sensitive solutions to the Water Treatment, Waste Water, Waste to Energy, and Pharmaceuticals Industry. With over 30 years of experience delivering expertise in the industry, JK Fabrications has become one of the front runners and will keep challenging ourselves and others to improve our Environment as we believe that ‘Our Environment, is our Future’. With the ease of access to Northern Ireland’s principal motorway network and equal distance between both Belfast Airports and Dublin Airport, JK Fabrications’ 50,000 Sq/ft premises in Newry are the perfect location to produce and deliver your project. Design We have a fully equipped in-house design team with over 65 years of combined technical, manufacturing, and sector-specific experience, that are highly skilled and trained using the very latest design software. Manufacture We have built our reputation by producing specialised products for the waste-to-energy, wastewater, water treatment, and pharmaceutical industries. Our experienced welders and fabricators along with our state-of-the-art machinery make sure that each project is carried out to a high standard. Install We have an experienced installation team with a dedicated core team of engineers, mechanical fitters, and coded welders who have over 30 years of experience in the supply and installation of our fabricated products for a wide range of projects throughout the UK and Ireland. Commission Our experienced commissioning engineers will attend the site to oversee the installation of systems, plants, and equipment. They will commission, test, and optimise the equipment as well as provide the operators with operation and maintenance manuals. Products include: Stainless Steel Pipework | Stainless Steel Vessels (inc Pressure Vessels) | Mild Steel Pipework | Lamellas | Picket Fence Thickeners | Rectangular Bridge Scrapers | Half Bridge Scrapers | Conical Settlement Tanks

    Pipeline & Pipework Products
    Accreditations
    Glenfield Invicta Ltd logo

    Glenfield Invicta Ltd

    United Kingdom

    From concept to completion, Glenfield Invicta’s end-to-end Project Solutions provide market leading valve and penstock engineering excellence, across a multitude of water utility and non-water utility infrastructure projects. The company combines the strength and unique proposition of Invicta’s site solutions, penstocks, and environmental expertise, with Glenfield’s experience and expertise in specifying and managing large Dams, Reservoirs and Hydropower projects. Supported by the vast product portfolio from the AVK Group of manufacturing companies. We are market leaders distinguished by our industry expertise, we have been designing and manufacturing specialist engineered valves and penstocks for more than 170 years. We stand behind every product we install for life, offering some of the best extended warranties in the industry. Our experienced and multi-skilled project team work closely with our partners and key stakeholders to ensure your project is executed to exacting standards. Our long history in designing, supplying, and installing highly engineered valves and pipeline equipment in projects is what sets us apart. Our projects are delivered safely, on time, and to the highest standards in arduous applications. This specialist capability has made the our brands synonymous with engineering excellence worldwide. We have recently invested over £2m in our Kilmarnock facility which extends to over 200,000 sq. ft. of manufacturing, office, warehousing, and education space. It includes a new purpose-built Learning Academy; which will include an interactive visitor centre. We are committed to training the apprentices and engineers of the future.

    Project Planning & Surveying
    Designers
    EMS Industries Ltd logo

    EMS Industries Ltd

    United Kingdom

    EMS are a UK based manufacturer of positive displacement ram pumps and grit removal solutions used traditionally in the wastewater industries but also in the food waste (AD) sector. EMS Industries was established in 1995 and has since grown into a world-renowned name for providing robust, reliable products which have provided our substantial client list with many years of trouble free service. All EMS products are designed, manufactured and tested in our Stoke on Trent operational facilities where we can also offer additional services including spare parts, service and repairs, installation, commissioning, operator training packages and full CAD and 3D modelling services. As a framework provider to some of the major UK utility companies, we ensure that our products meet with all current legislation and continually strive to provide innovative products to the market place.

    Treatment Process Technologies
    Waterco logo

    Waterco

    United Kingdom

    Waterco are engineering and environmental consultants providing design and consultancy services relating to water, drainage and flood risk. We have expertise in engineering and environmental disciplines and are supplemented by a network of specialist independent consultants with extensive experience in major development projects throughout the UK. Our focus is on achieving the optimum solution for our clients, meeting their objectives and adding value to their projects. We have gained a reputation for a friendly, professional and flexible approach since our establishment in 1990. Our Services Water industry infrastructure and non-infrastructure projects Pipelines & Sewerage Water & Wastewater Treatment & Systems Pumping Stations Contingency Planning Security Assessments Asset Management Surge Analysis Hydraulic Modelling Flood Risk Assessment Breach Analysis Coastal & Shoreline Analysis Surface Water Management Sustainable Drainage Systems Natural Flood Management/Catchment Approaches Clients and Partners Our clients and partners include water companies, consultants and contractors. Incorporating their experience and knowledge, we investigate and develop practical designs, to help deliver cost-effective solutions. Geographic Coverage We undertake projects all across the UK, with many of our reporting services being desk-based, travelling to site visits and meetings as required. We have also been involved in international projects such as a major development in Lekki, Nigeria. Accreditations We currently have an ISO 9001 : 2015 accredited Quality Management System; have a BS8555 : 2003 certified Environmental Management System; have design approval in the Water Industry Registration Scheme (WIRS); have maintained Investors in People recognition since 2011 and operate an ICE approved training scheme.

    Designers
    JN Bentley Ltd logo

    JN Bentley Ltd

    United Kingdom

    JN Bentley Ltd (JNB) is a leading, privately owned construction services provider in the UK. We now have an annual turnover in the region of £100 million, generated from projects in both the building and civil engineering markets. JN Bentley JN Bentley delivers civil engineering contracting services, together with mechanical and electrical expertise. Founded in 1972, the company has grown largely from repeat work, maintaining a focus on providing construction services with an open and honest approach. The JN Bentley team numbers over 2,000 colleagues. We pride ourselves on our large, directly employed construction workforce, a team that gives us and our clients added assurances for safety and quality. We look to find innovative solutions to traditional construction challenges, applying the latest technologies to drive efficiency and reach sustainable outcomes. Across JN Bentley and our design and build companies MMB and JBA Bentley, annual revenue now exceeds £500 million. Mott MacDonald Bentley (MMB) MMB provides fully integrated civil engineering feasibility, design, construction and commissioning services to the UK water sector. Established in 1999, it harnesses the contracting strength of JN Bentley and the design specialisms of Mott MacDonald to form a 3,000-strong team – with further expertise brought in from across the Mott MacDonald Group when required. MMB was formed specifically to deliver long-term, high-volume capital programmes collaboratively with water companies. With a focus on innovation, affordability, and flexibility, since securing its first contracts with Yorkshire Water in AMP3, MMB has grown to deliver work for eight of the largest water companies in the UK.

    Renewables & Energy Management
    Contractors
    Costain logo

    Costain

    United Kingdom

    Costain works with water and wastewater companies to shape, create and deliver pioneering solutions that improve water quality, affordability and resilience. Population growth, regulatory changes, energy costs and climate change are having a dramatic impact on water usage. The national approach to managing water supply is changing to meet these challenges. The Government and industry regulator are tasked with cutting wastage and preserving an increasingly valuable resource, while protecting consumers from higher water bills. The water sector team offers: Expert input into consultation documents, close work with Government and water companies and innovative delivery, all of which help to minimise costs to water users while meeting national investment needs. A manufacturing mindset: programme optimisation advisory services, standard product development, production controls, whole-life costing and lean delivery processes. Cross-sector best practice: we provide value for our clients by drawing on experience from across the company and by working closely with our decarbonisation experts to drive regional growth strategies. Technology integration: working with some of the UK’s leading asset and data analytics organisations we analyse large volumes of real time data to create greater benefits for our customers through optimised maintenance, pump operation, energy and chemical usage. Current water industry frameworks: Anglian Water – Strategic Pipeline Alliance Severn Trent Southern Water – CMDP JV Thames Water United Utilities – Maintenance Service Provider Yorkshire Water – Technical Services

    Programme Management
    Contractors
    Active Tunnelling Ltd logo

    Active Tunnelling Ltd

    United Kingdom

    As an industry leader since 1994, Active Tunnelling Ltd (ATL) is the UK’s most experienced independent, micro-tunnelling, auger boring, shaft sinking and pipe jacking company offering a comprehensive range of services to the water and civil engineering industries across the UK & Ireland. More than just a tunnelling company ATL delivers all encompassing projects solutions: whether it is a segmental shaft or complete project management from ‘tunnel’ to final landscaping, ATL delivers flexible, and tailor made solutions to suit any brief. ATL prides itself on its long list of clients that includes amongst others the UK’s leading construction companies and is proud to claim total satisfaction on every job. A dedicated and highly skilled/experienced sixty strong team are at the core of ATL’s success, this weight of experience backed by the UK’s largest independent specialist plant enables ATL to deliver on time every time. Services Our comprehensive range of services allows us to satisfy even the most demanding brief, even with short lead times you can place your trust in us leaving you to focus on other aspects of the project. Tunnelling and pipejacking: 1,000mm – 2,400mm diameter. Micro-tunnelling: 150mm – 900mm diameter. Auger boring: 150mm – 725mm diameter. Grouting. Shaft sinking. Cover slab construction. Timber headings. ATL offer Professional management team with over 30 years experience. Quick mobilisation to site. Technical support/design where required. Achilles UVDB Verify approved company. Quality Assured ISO 9001:2008 Registered Firm Cert. No. A11969. Fast response to enquiries. Fast and efficient service maintaining a high standard of safety. Specialist trenchless plant. A completed project to a high quality at a reasonable price. A willingness to work as one team with all parties to ensure satisfaction.

    Networks - Water Supply
    Contractors
    Quantum Engineering Developments Ltd logo

    Quantum Engineering Developments Ltd

    United Kingdom

    Quantum Engineering Developments Limited specialises in the design, construction installation and commissioning of surge control systems, compressed air systems and booster pump sets. Surge Control Systems Surge conditions, or ‘water hammer’ can occur due to starting or stopping a pump, or failures in the power supply, controls or valves. Quantum Engineering is the leading UK supplier of surge vessels and related control equipment for the alleviation of this effect. All systems can include a patented QUBE controller, developed especially for surge vessel and accumulator control in complex variable flow rate and multi-pump systems. Packaged Booster Pump Sets The company supplies booster sets suitable for applications in final effluent and potable water booster pumps for sewage and water treatment installations. Control Panels Quantum Engineering specialises in the construction of multi-compartment control panel suites to suit the requirements of most UK water authorities. Electrical control panels are available with relay, PLC and microprocessor controlled logic systems, including variable speed drives and soft start, as well as conventional DOL and STAR/DELTA starters. Accreditation All systems are factory tested in house, and are assembled and fitted to meet current statutory requirements, including UK pressure systems legislation and DWI Regulations 25 and 31. Recent Contracts QED supply and install surge vessels via both main contractors and direct with the end users, to nearly all of the UK water companies on both new and replacement/refurbishment projects. What can Quantum do for you today?

    Accreditations
    Drive Systems Limited logo

    Drive Systems Limited

    United Kingdom

    With over 35 years experience and knowledge of manufacturing variable speed electrical control systems, Drive Systems Ltd provide fixed and variable speed drives, control panels and will commission and install both the mechanical equipment and electrical supplies, as required. Drive Systems Limited is a wholly owned independent company founded in 1986 by its present directors to promote the use of packaged inverter drive systems into a wide range of industrial applications so that they could benefit from the flexibility of control and the large potential energy savings that this, then, emerging new technology could provide. Many areas of industry, from pet food manufacturers to woodworking machine makers and from the nuclear industry to the water companies became valued customers and benefited from bespoke packaged drive systems tailored to their specific application. The water companies soon became the source of the majority of the companies workload, with inverter based drive systems being developed for wet well submersible pump systems, rectangular bacteria bed distributors (both rope hauled and independently driven) and for circular filter bed distributor drives. This latter drive system, enjoying patent protection of its principles of operation, has been a huge success and over 2000 systems have been supplied into all of the UK`s Water Companies, as well as to numerous overseas locations. Drive Systems has recognised the need, not only to provide products and packaged control systems, but also to provide an installation and commissioning service which ensures optimised performance from the existing plant. Drive Systems site programme includes installation of both mechanical and electrical equipment on prepared foundations. The service is not complete without the inter connection of all items of equipment, including cables, cable trays and ducts, as required. Lighting, heating, ventilation are a natural extension of this work. Drive Systems can provide Fixed and variable speed drives for pumps and fans Control panels and cabinets designed for specific applications Percolating circular filter bed drives and control Percolating rectangular filter bed drives and control Complete installation both mechanical: cabling and electrical supplies Commissioning and test Servicing and repairs

    Treatment Works Products/Services
    AJ Engineering & Construction Services Ltd logo

    AJ Engineering & Construction Services Ltd

    United Kingdom

    AJ Engineering & Construction Services Ltd provide a wide spectrum of engineering services ranging from steel fabrication and CNC machining to cladding and civil engineering, with our highly experienced team we provide on-time, on-budget quality solutions. From our bases in Forres and Fort William, and a team accustomed to travel we can meet our client’s needs wherever required. Having worked on various water and wastewater treatment projects for the past 25 years we have developed a great working relationship with water companies across the UK. Our in-house capabilities allow us to offer a turnkey service to our clients from reactive maintenance and manufacturing to planned infrastructure and non-infrastructure projects. Many of the projects we undertake in the water sector are within water treatment and wastewater treatment plants where cleanliness is paramount, all our water sector site teams hold certification and Water Hygiene cards. Our range of services collated into one means that we can take on multiple discipline contracts and deliver them as one which provides our clients with a number of advantages. It removes the need to have multiple contractors on site at once. Benefits in cost savings passed down on procuring large amounts of steel for a side wide project. Little risk of dimensional discrepancies between contractors We work alongside framework delivery partners throughout the UK providing the services below; Steel portal frame buildings (design, fabrication, erection & cladding) Design, manufacture and installation of pipe bridges Design, manufacture and installation of site wide access metalwork (walkways, access stairs, ladders etc) Design, manufacture and installation of modular water buildings transportable by road. Design of various process tanks, pipework and pumps. Fabrication of tanks and pipework (stainless and carbon) Mechanical Installation Modular Treatment Buildings and Mechanical Fit-out SR2 rated steel enclosures (quicker than GRP Kiosks) We appreciate how important quality and cleanliness is in the water sector and we are proud that we have completely segregated facilities for stainless steel and carbon steel. In addition to this we are also approved under the regulations 31(4)(A) of the water supply regulations 2016 to supply stainless steel and pipework fabrications to the drinking water sector.

    Networks - Sewerage
    Asset Maintenance & Rehabilitation

    Pump Selection, Hydraulic Design, and Performance Standards for Water and Wastewater Applications

    Pump selection for water and wastewater applications requires matching the pump hydraulic performance curve (head-flow, H-Q) to the system curve (static head plus friction losses). Key pump types: centrifugal (radial, mixed-flow, axial) for low-to-high flow at moderate-to-low head; positive displacement (reciprocating plunger, progressive cavity, peristaltic) for high-viscosity, high-pressure, or metering duties; submersible borehole pumps (multi-stage radial, 4-inch to 24-inch diameter, 100 to 3,000 L/min); end-suction and split-case centrifugal (ISO 9906 performance certification, Class 1 or 2); and axial flow propeller pumps (high flow, low head, 1,000 to 50,000 L/s in flood pumping stations). Duty point selection requires adequate Net Positive Suction Head Available (NPSHa) exceeding NPSHr by a minimum safety margin of 0.5 to 1.0 m per ISO 9906. Pump efficiency at duty point should exceed 65 to 75 percent minimum for large-scale applications; EU ErP Minimum Efficiency Index (MEI) of greater than or equal to 0.4 applies to water pumps 0.75 to 150 kW under Regulation 547/2012.

    Variable speed drives (VSDs, also variable frequency drives, VFDs) are applied to centrifugal pumps to modulate flow and pressure with substantially reduced energy consumption. Affinity laws: flow varies proportional to speed (Q2/Q1 = N2/N1); head varies as square of speed (H2/H1 = (N2/N1)2); power varies as cube of speed (P2/P1 = (N2/N1)3) - a 20 percent speed reduction reduces power by 49 percent. VSD retrofits typically achieve 20 to 50 percent energy savings in pumping systems with variable demand profiles (water distribution, HVAC). VSD efficiency: modern IGBT-based drives achieve 97 to 98 percent efficiency at full load; at 50 percent speed, combined motor-drive efficiency remains above 85 percent. Harmonic distortion from VSDs (IEEE 519-2014 THD limits: less than 5 percent voltage THD at point of common coupling) requires harmonic filters or 12-pulse rectifier configurations on large installations greater than 75 kW.

    Pump maintenance and lifecycle management: MTBF for submersible wastewater pumps is typically 15,000 to 25,000 hours (7 to 12 years continuous operation); mechanical seal life 5,000 to 15,000 hours depending on solids content and abrasion. Condition monitoring technologies: vibration analysis (ISO 10816 velocity limits: less than 2.8 mm/s for Class I small pumps, less than 4.5 mm/s for Class II medium pumps at bearing housings); current signature analysis (CSA) detects rotor bar defects and impeller wear via motor current harmonics; online pressure pulsation analysis detects cavitation and recirculation. Pump testing: ISO 9906:2012 specifies factory acceptance test (FAT) tolerances: efficiency tolerance minus 3 percent for Class 1, minus 5 percent for Class 2; flow tolerance plus or minus 4 percent (Class 1). Site acceptance testing (SAT) conducted after installation at design duty points confirms system hydraulics. UK Water Industry standard PSSR 2000 (Pressure Systems Safety Regulations) and PED (Pressure Equipment Directive) apply to pressurised pump systems.

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    Frequently Asked Questions

    How do I select the right pump for a water system?

    Pump selection follows a systematic process: (1) Define the duty point: required flow (L/s or m3/hr) and total dynamic head (TDH = static head + friction losses at design flow); (2) Plot the system curve (head vs flow for the pipeline); (3) Select pump type: centrifugal for most water/wastewater duties; positive displacement for metering, high viscosity, or high pressure greater than 100 bar; (4) Match pump H-Q curve to system curve: duty point should be at or near the pump's best efficiency point (BEP), ideally within 70 to 110 percent of BEP flow to avoid recirculation and cavitation; (5) Check NPSHa vs NPSHr: NPSHa must exceed NPSHr by 0.5 to 1.0 m; (6) Verify motor power at maximum flow on the H-Q curve (non-overloading characteristic preferred); (7) For variable demand: size for maximum duty, apply VSD for turndown. ISO 9906 Class 1 or 2 factory test certification should be specified for all critical pumps.

    What efficiency standards apply to water pumps?

    EU Regulation 547/2012 (implementing Ecodesign Directive for water pumps): sets Minimum Efficiency Index (MEI) requirements for clean water end-suction, multistage, submersible borehole, and circulators. MEI greater than or equal to 0.4 for water pumps 0.75 to 150 kW from January 2015; MEI greater than or equal to 0.7 from January 2017. MEI is a dimensionless index comparing pump efficiency at specific speed (Ns) against a reference: MEI 0.4 approximately equals 65 to 75 percent hydraulic efficiency for common pump sizes. US: DOE EISA 2007 Section 312 sets minimum efficiency standards for submersible turbine pumps and clean water centrifugal pumps. UK: retained EU Regulation 547/2012 post-Brexit via UKCA marking. Extended Product Approach (EPA) for pump plus motor plus drive systems uses Pump Energy Index (PEI) weighting efficiency across the operational range. ACEEE and Hydraulic Institute publish additional efficiency guidelines for large municipal pumps above the EU Regulation scope.

    When should variable speed drives be used on pumps?

    VSDs provide the greatest benefit when pump demand varies significantly over time. Key criteria: (1) System with variable demand: water distribution (daily demand variation 40 to 200 percent of average), HVAC cooling water (seasonal variation), irrigation (batch cycles) - VSD payback typically 1 to 4 years; (2) System head dominated by friction (not static head): affinity laws apply most beneficially when friction losses predominate; in high-static-head systems (borehole pumping against 100 m+ static head), VSD speed reduction saves less energy than expected because head is largely independent of flow; (3) Throttled valve control: existing systems with control valves wasting energy are prime VSD candidates; (4) Soft-start requirement: VSDs eliminate motor starting current surges (typically 600 to 800 percent of full-load current for DOL starting vs 100 to 150 percent for VSD ramp-up), reducing electrical system stress and extending motor life. VSD contraindications: pumps running at constant duty near BEP continuously (e.g. constant-flow industrial process) gain little from VSD and pay unnecessary conversion losses.

    What causes pump cavitation and how is it prevented?

    Cavitation occurs when local pressure in the pump falls below the liquid's vapour pressure, forming vapour bubbles that collapse violently (implosion pressure 100 to 1,000 bar locally) causing erosion, noise (crackling/gravel-like sound), vibration, and head/flow loss. Causes: (1) Insufficient NPSHa - high suction lift, long suction pipe, high fluid temperature, high altitude reducing atmospheric pressure; (2) Operating far above BEP (recirculation cavitation): internal recirculation at impeller inlet and discharge at flows greater than 115 percent BEP; (3) Vortex at suction bell/sump (entrained air); (4) System resonance creating pressure pulsations. Prevention: (1) Maintain NPSHa greater than NPSHr + 0.5 to 1.0 m safety margin (ANSI/HI 9.6.1 specifies required margin by pump type); (2) Reduce suction lift: submersible or wet-pit installation; (3) Oversize suction pipework (velocity less than 1.0 m/s at pump inlet); (4) Operate pump near BEP (70 to 110 percent flow range); (5) Sump design per ANSI/HI 9.8 (wet-pit dimensions, submergence, floor clearance) to prevent vortexing.

    Case Study·Water supply infrastructure
    Challenge

    A water company in the North West of England needed to replace eight ageing horizontal split-case pumps at a strategic reservoir-fed booster station supplying 65,000 properties. The existing pumps, installed in 1987, had specific energy consumption of 0.68 kWh/m3, bearing failures every 14 months, and no variable speed control, causing frequent pressure transients on start/stop.

    Approach

    The contractor replaced units with end-suction centrifugal pumps fitted with integrated VSD drives, operating in a duty/assist/standby configuration. Hydraulic modelling confirmed new pump curves against system curve across all demand scenarios. Sump geometry was redesigned per ANSI/HI 9.8 to eliminate pre-swirl vortices. SCADA integration enabled cascade pump sequencing controlled by pressure at the delivery main.

    Outcome

    Specific energy consumption fell to 0.41 kWh/m3, saving GBP 62,000 per year in electricity. Mean time between bearing failures extended beyond 36 months in year one of operation. Pressure transient events fell from 18 to 2 per year, eliminating two main burst incidents attributable to water hammer. Whole-life cost projection showed 22% saving versus like-for-like replacement.

    Questions to Ask Shortlisted Providers

    1. 1

      What are the system curve characteristics across minimum and maximum demand conditions?

      Pump selection requires matching pump curve to system curve at all operating points; mismatch causes cavitation, excessive wear, or energy waste from throttling.

    2. 2

      Is variable speed drive control specified and what is the minimum speed turn-down ratio required?

      VSD control saves 20 to 40% energy in variable-demand systems but requires attention to minimum speed to avoid bearing lubrication failure at low flows.

    3. 3

      What materials of construction are specified for the pumped fluid (pH, chlorine, abrasives, temperature)?

      Potable water pumps require WRAS-approved wetted materials; wastewater and chemical dosing duties require chemically resistant alloys or coatings.

    4. 4

      What is the NPSH available at the pump suction under worst-case operating conditions?

      Insufficient NPSHa causes cavitation; must be verified against pump manufacturer's NPSHr with a safety margin of at least 0.5 m per ANSI/HI 9.6.1.

    5. 5

      What cybersecurity and resilience standards apply to the pump control SCADA system?

      Pumping stations serving critical water supply are subject to UK NIS Regulations 2018; IEC 62443-aligned security architecture is increasingly required by water company asset standards.

    What Drives Cost in This Category

    Pump size and hydraulic complexity

    End-suction centrifugal pumps for water supply cost GBP 8,000 to 45,000 per unit; large axial flow or mixed-flow pumps for high-volume low-head duties cost GBP 80,000 to 350,000 including motor.

    Variable speed drive integration

    VSD units add GBP 5,000 to 30,000 per pump depending on motor rating; energy payback typically 2 to 5 years in variable-demand applications.

    Civil and electrical infrastructure

    Pump house civils, electrical supply upgrades, and SCADA integration typically account for 40 to 60% of total project cost.

    Whole-life energy and maintenance costs

    Energy is typically 60 to 75% of whole-life pump cost over 25 years; IE3/IE4 motors and BEP-optimised selection reduce totex significantly versus lowest-capex choices.

    Key Regulations & Standards

    WRAS Approval for Potable Water Contact

    All wetted materials in pumps handling potable water must be WRAS-approved; non-compliant components constitute a breach of the Water Supply (Water Fittings) Regulations 1999.

    ISO 9906:2012 Rotodynamic Pumps Hydraulic Performance Acceptance Tests

    Specifies acceptance test grades (Grade 1U, 1E, 2U, 2E, 3B) with tolerance bands for flow, head, and efficiency; Grade 1E is commonly specified for water industry pumps.

    Pressure Systems Safety Regulations 2000 (PSSR 2000)

    Pump systems operating above atmospheric pressure require a written scheme of examination by a competent person; periodic inspection intervals are defined in the scheme and enforced by HSE.

    UK NIS Regulations 2018 and Ofwat AMP8 Resilience Expectations

    Pumping stations serving critical water supply qualify as essential service operator assets; obligations include IEC 62443-aligned cybersecurity controls and NCSC incident reporting within 72 hours.

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    Comparing water pump companies is one slice of a larger shortlisting decision. Explore the complete directory of wastewater treatment companies, then filter by region, sector, and technology before you request scoped proposals.

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