Filament-wound and centrifugally cast GRP/FRP pipe manufacturers for water, sewer, and chemical service.

    Find a GRP / FRP Pipe Provider

    Matched providers: 31

    Top countries: United Kingdom, Belgium

    Popular technologies: Acid Dosing Systems, Aerated Lagoons, MABR

    GRP and FRP Pipe Design Standards: Pressure Class, Stiffness, and Corrosion Resistance

    Glass Reinforced Plastic (GRP), also termed Fibre Reinforced Polymer (FRP) pipe, is manufactured by filament winding or centrifugal casting of glass fibre rovings in a thermoset resin matrix (isophthalic polyester, vinyl ester, or epoxy). Pressure classes range from PN 1 to PN 32 (bar) per ISO 10639 (underground water) and AWWA C950. Pipe stiffness (SN) classifies deflection resistance: SN 2,500 to SN 10,000 N per m2 for buried applications, selected based on soil loading, trench depth, and bedding class. Wall construction is typically dual-layer: structural wall (glass content 70 to 75 percent by weight) plus a resin-rich corrosion liner (glass content below 30 percent, minimum 2.5 mm thick).

    Design advantages over steel and ductile iron include: zero corrosion allowance (eliminates cathodic protection and coating maintenance), Manning roughness coefficient n = 0.009 (vs 0.013 for concrete, enabling smaller pipe diameter for equivalent flow), and weight savings of 70 to 80 percent versus steel (DN 1000 GRP pipe weighs approximately 120 kg per m vs 450 kg per m for steel). Hazen-Williams C-factor is 150 for GRP vs 100 to 120 for aged steel. Joints are typically butt-and-strap laminate or elastomeric coupling; restrained joints for pressure pipes use glass fibre tape wrap over the coupling.

    Temperature limits for standard polyester GRP are -20 to +80 degrees C; vinyl ester extends to 100 to 120 degrees C for industrial chemical service. Chemical resistance is resin-dependent: isophthalic polyester resists pH 2 to 12; vinyl ester resists concentrated acids and alkalis. GRP pipe complies with ISO 10639 (potable water, NSF 61 listed resin required), EN 1796, and AWWA C950. Cost per metre for DN 500 GRP is $80 to $150 installed versus $200 to $350 for ductile iron at the same diameter. Lifetime cost advantage from eliminated corrosion protection makes GRP preferred for aggressive soil and process chemical environments.

    Frequently Asked Questions

    What is the difference between GRP and FRP pipe?

    GRP (Glass Reinforced Plastic) and FRP (Fibre Reinforced Polymer) are effectively synonymous terms for pipe manufactured by reinforcing a thermoset polymer resin matrix with glass fibres. GRP is the common European and water industry term; FRP is used in the US chemical and oil-and-gas sectors, where carbon fibre reinforcement may also be used (CFRP). Both refer to the same product family when glass fibre is the reinforcement. The key variables are resin type (polyester, vinyl ester, epoxy), glass content (60 to 75 percent by weight for structural layer), and manufacturing method (filament winding for pressure pipe, centrifugal casting for gravity pipe DN 300 to DN 3600).

    What pressure can GRP pipe handle?

    GRP pipe pressure ratings range from PN 1 to PN 32 (1 to 32 bar working pressure) per ISO 10639 and AWWA C950, with short-term hydrostatic burst pressure typically 2.5 times the rated working pressure. For water mains in the DN 300 to DN 1,200 range, PN 10 to PN 16 (10 to 16 bar) is the most common specification, covering most distribution and transmission main pressures. For fire protection service (requiring 12 bar working pressure and 24 bar hydrostatic test), PN 16 pipe is standard. Surge pressure must be evaluated separately: GRP has a lower elastic modulus than steel, resulting in lower surge pressures for the same flow change but potentially higher deflection at unsupported spans.

    How is GRP pipe joined?

    Four joint types are used in practice. Butt-and-strap (BAS) joints: glass fibre tape laminated over the pipe ends using the same resin, providing full structural continuity and pressure capacity equal to the pipe barrel. Suitable for all buried and aboveground pressure applications. Elastomeric coupling joints: a double-socket sleeve with EPDM or NBR ring seals slipped over pipe ends; quick to install but not restrained against longitudinal pull-out. Flanged joints: filament-wound GRP flanges laminated to pipe ends, used at valves, bends, and equipment connections. Adhesive bonded (for structural GRP fittings): isophthalic resin adhesive applied to socket and spigot. BAS joints are specified for large-diameter water transmission mains and chemical pipelines requiring zero-leak integrity.

    Can GRP pipe be used for hot water or steam?

    Standard isophthalic polyester GRP pipe is limited to 60 to 80 degrees C continuous service. Vinyl ester GRP pipe (e.g. Derakane 510C or equivalent) is rated to 100 to 120 degrees C. Epoxy GRP pipe with post-cure achieves 130 to 150 degrees C. For steam or condensate at pressure, GRP is not appropriate above 120 degrees C; high-temperature steel or duplex stainless is preferred. Thermal expansion of GRP is 2 to 3 times that of steel (alpha = 20 to 25 times 10 to the -6 per degree C), so expansion loops or bellows must be incorporated in aboveground hot water lines. For geothermal brine at 50 to 80 degrees C, standard GRP vinyl ester with appropriate chemical liner is a common and cost-effective choice.

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    Infrastructure, Networks & Equipment

    GRP / FRP Pipe Companies

    Filament-wound and centrifugally cast GRP/FRP pipe manufacturers for water, sewer, and chemical service.

    31 providers

    This page is a good fit if you need:

    • Acid Dosing Systems or Aerated Lagoons, MABR capabilities
    • Suppliers with asset maintenance & rehabilitation sector experience
    • Providers operating in United Kingdom or Belgium
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    Networks - Sewerage6
    Networks - Water Supply6
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    Find a GRP / FRP Pipe Provider

    Showing 1-20 of 31

    31 results from 31 matched providers

    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
    Vetres Srl logo

    Vetres Srl

    Verified
    Italy51-200 employees
    europe · mea

    We are Vetres, an Italian engineering and manufacturing company with over 30 years of experience in fiberglass reinforced plastic solutions. We design, manufacture, and install custom FRP tanks, pipes, silos, and large-scale storage systems for water, wastewater, industrial, and food-grade applications. Our strength lies in combining solid engineering, high-quality materials, and tailor-made designs to deliver durable, corrosion-resistant solutions. From detailed design to on-site construction and technical support, we work closely with clients to ensure reliable performance across the full lifecycle of every project.

    Customized Plant Construction
    Storage Tanks and Reservoir Construction
    manufacturing
    food-beverage
    DALI - Pipeline Monitoring logo

    DALI - Pipeline Monitoring

    Belgium1-50 employees
    europe

    DALI - Pipeline Monitoring specializes in advanced real-time leak and intrusion detection for pipelines using Distributed Acoustic Sensing (DAS) and fiber optic technology. Their solutions help utility companies and industrial facilities minimize Non-Revenue Water (NRW) losses, reduce waste, and prevent costly incidents, ensuring efficient pipeline management.

    Online/Real-Time Monitoring
    Remote Sensing and Telemetry
    IoT and Smart Monitoring
    Utilities
    Public Administration
    AVK UK Ltd logo

    AVK UK Ltd

    United Kingdom

    AVK UK is part of the globally renowned AVK Group who are based in over 100+ countries and has over 4,500+ employees worldwide. The AVK Group is privately owned by the founder Niels Aage Kjaer, and is named after his father Aage Valdemar Kjaer. As part of the AVK Group, we pride ourselves in being one of the leading valve manufacturers for the water, sewage, firefighting, and gas industries. Our product program comprises a large range of valves, hydrants, pipe fittings and accessories, each complying with the highest standards of safety and durability. Our focus is on the products designed and manufactured to the British Standards, however, the AVK Group today offers products in accordance with the most national and international standards. Our product portfolio also includes AVK Smart Water Management valves and sensors for real-time network information and status. We also offer Pressure Management solutions such as air valves, PRVs, and control valves, AVK Assist which enables GPS product location and, the market leading Donkin PUR range of gas valves. Our UK sales offices and manufacturing sites respond quickly to the needs of our customers and for fittings required on an express or emergency service we have a dedicated same day 24/7 helpline – 0800 202 8228. In addition, we cooperate with local and national distributor partners to offer our customers AVK products as part of multi-product packages. AVK UK is the sales division and has offices in Staveley, near Chesterfield, also known as the home of Bryan Donkin gas valves, and Northampton. AVK in the UK comprises of 7 companies and has over 500 employees. Find out more here: https://www.avkuk.co.uk/en-gb/solutions-and-information/about/avk-in-the-uk/avk-uk

    Treatment Works Products/Services
    Asset Maintenance & Rehabilitation
    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
    Steve Vick International Ltd logo

    Steve Vick International Ltd

    United Kingdom

    Steve Vick International (SVI) is dedicated to delivering cost-saving solutions for damaged, redundant or outdated underground pipework. Since its foundation in 1981, SVI has been at the forefront in developing products and techniques for the repair, renovation and decommissioning of pipes. Predominantly our work has been in the gas industry but increasingly we are undertaking projects in the water and nuclear sectors. We are the UK’s leading producer of Pipe Coil Trailers and offer a range of Pipe Handling equipment such as Handlers, Crackers and Cutters. Some of our latest innovations include the PE Pipe Cutter, the Pipe Feeder for Pre-Insulated coiled pipe, PE Live Head for Live Mains Insertion, the Perpetual Pipe Pusher, FBOS (Foambag Operation on Stubs) and SMARTester. WATER: For over 20 years water utilities and their contractors in the UK and overseas have used our pipe handling equipment to improve their efficiency and safety. Today our products include Pipe Handlers, Pipe Coil Trailers and Pipe Cutters as well as our patented DRAINBLOCK™ and RATBLOCK™ sealing systems. GAS: In the UK we are major suppliers to all the gas distribution networks. Many of the techniques we have pioneered have become the preferred methods of working in the industry and our resin foam sealant products and associated equipment are key to many of the cost-saving renovation processes used. NUCLEAR: SVI offer solutions to the problems associated with decommissioning and sealing disused pipework, ducts, sleeves and ventilation shafts. Our technology can also be designed for the mass filling of large and complex voids and is a lightweight alternative to cement grout. We have worked at Hinkley, Sellafield, Harwell, Chapelcross and Hunterston. CONTRACT SERVICES: A rapidly expanding part of our business is our Contract Service department who are well known for their work in the field of renewing and repairing underground gas pipes, for the UK Gas Distribution Networks. However, they are becoming increasingly involved in projects being undertaken by water utilities, electricity providers, rail networks, civil engineers, construction companies and local councils. This reflects the range of skills and expertise available to solve on-site problems associated with pipe repair, renovation, and diversion. Located strategically around the UK the highly skilled team can provide a fast response, emergency repairs and a rapid call out service which is offered 24 hours a day, 7 days a week. HIRE: We offer specialist plant and equipment for the Utilities Industries. Products available for hire include our Pipe Handlers, Perpetual Pipe Pusher, Pipe Coil Trailers, Rapid Rotary Cutters, Rapid Window Cutters, MACAW Pipe Crackers, CRACKERJACK and Mini Purge. All our hire equipment comes with onsite support from our highly experienced engineers and our products are fully maintained and serviced at our depots. All equipment is also available to purchase. SMARTester: SMARTester is the wireless pressure test system, that ensures absolute traceability and best practice. The system combines: SMARTester pressure sensor, an intuitive App and a Dashboard database of test evidence. Together the 3 components work to give you confidence that your tests are highly accurate, fully compliant and that evidence is traceable.

    Networks - Water Supply
    Asset Maintenance & Rehabilitation
    Polyglas logo

    Polyglas

    Netherlands
    north-america

    Polyglas is a manufacturer of plastic pipes and fittings. Polyglas supplies GRP (glass-reinforced plastic) pipes for water, wastewater, industry, and infrastructure.

    FT Ductile Ltd logo

    FT Ductile Ltd

    United Kingdom

    Ductile Iron Pipe and Fittings FT Ductile supplies a wide range of high quality, ductile iron pipes, fittings and ancillary products to the water industry for both potable and dirty water. Large stocks at our premises allow us to fulfil many orders on a next-day basis. Whatever the size of project, we can provide a tailor-made solution to include the sourcing, supply, delivery and after sales service. We supply ductile iron pipes in a range of diameters, from 80mm to 1600mm. Over the years, the range of products supplied by FT Ductile has expanded to include everything from ductile iron pipes to flange adaptors and valves. We have a number of exclusive distribution agreements in place and all products conform to DWI standards. Ductile iron pipes are most commonly used for drinking water and sewage distribution, usually lined with cement mortar in order to prevent corrosion over time. The benefit of using ductile iron pipes in potable and waste water systems is that they are stronger and resistant to fracture. FT Ductile has supply chain links with companies in Europe, USA and the Far East which has given us strong foundations for understanding how other cultures and nationalities like to do business. This information is invaluable when we come to export our pipe products and services. Wherever you are based, and whatever you require, from individual items such as valves and fittings, through to more complex orders for lengths of ductile pipe and fittings, we will provide you with our best possible price. And you can rest assured that through our extensive transport links, our products will reach you in a safe and timely manner. To find out more regarding our ductile iron pipes and other products, please feel free to contact us.

    Treatment Works Products/Services
    Networks - Sewerage
    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
    Step on Safety Ltd logo

    Step on Safety Ltd

    United Kingdom

    INDUSTRY-LEADING ANTI-SLIP GRP ACCESS SOLUTIONS: Step on Safety was founded in 2007, taking the market by storm with a selection of specialist anti-slip flooring and GRP products that have a proven, technical advantage over traditional materials. For the first time, an industry saturated with dated solutions was given a choice – advanced, versatile composites that work. We are an ISO 9001-accredited supplier of composite (GRP) slip-resistant access structures and flooring and provide a variety of industries with design, fabrication and installation solutions, including the Water, Gas, Electricity and Nuclear industries, Public, Health, Motor, Stadium, Industrial, Construction and Rail sectors. From providing a simple Hop Over to protect pipes and cables to working on multi-million pound projects such Southern Water’s Portbello Pumping Station and Anglian Water’s London Road WTW, no job is considered to large or too small. Our team is based out of a large workshop in Suffolk and comprises over 70 GRP experts. Every member of our staff is fully qualified and has extensive knowledge of the composites industry – some with on-site construction knowledge, others with years of fabrication experience. We strive to deliver competitively priced products on time, in full, every time. SOLUTIONS INCLUDE Hop Overs & Step Overs Access Ladders, Stairs & Ramps Maintenance Platforms Walkways & Gantries Bund Floors Sump & Tank Covers Handrails Machine Guards GRP is a superb alternative to traditional steel construction. It is impervious to water and most chemicals so never rusts or rots. It’s lightweight and impact resistant and the anti-slip qualities remain even when wet, icy or oily. It never needs painting or treating and does not chip or fade.

    Health & Safety
    Access Systems (Stairways, Walkways & Handrailing)
    AE Yates Group logo

    AE Yates Group

    United Kingdom

    Established in 1870, AE Yates is a progressive civil engineering contractor with an enviable track record of successfully delivering technically demanding high quality works to the complete satisfaction of a wide variety of public and private customers. An Integrated Construction Company A E Yates has grown to be an integrated construction company with a turnover of £50m, employing over 170 managerial, professional, technical and operational staff. Our company headquarters, based in Bolton, are strategically located to serve and communicate with clients throughout the United Kingdom with immediate access to road, rail and air transport facilities. We also have an operating base in Sheffield. AE Yates Group The group companies add value for customers not just in their specialism. When working together they can offer an integrated service through resource sharing and joint management of activities. Operational interfaces are removed eliminating potential co-ordination, management and programming issues for customers. AE Yates Civil Engineering Ltd AE Yates Directional Drilling Combined Soil Stabilisation Side Grip Piling SPI Piling Tritech Ground Engineering AE Yates Haulage Equipment and Skills Investment in the development of highly skilled operational teams up to date equipment has reinforced and enhanced our capability in all areas of operations. We own and operate an extensive fleet of general civil engineering and specialist plant and equipment. Experienced and Dedicated We are a highly experienced and respected civil engineering contractor operating to an Integrated Management System which is fully accredited to IS 9001:2015, ISO14001:2015 and ISO45001:2018 by BSI. We are fully committed to meeting the required standards of quality, customer care, environmental awareness, safety, health, time and cost demanded by our clients. We are fully supportive of the UK industry’s drive towards Continuous Improvement, Best Value and Constructing Excellence.

    Renewables & Energy Management
    Contractors
    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
    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
    Greenbank Group logo

    Greenbank Group

    United Kingdom

    A specialist engineering company with a global customer base. Greenbank provides a wide range of products and services to companies operating across a number of industries and is now establishing itself in the clean and wastewater sector. For many years the company has utilised the unique properties of volcanic basalt for lining products used in heavy industries such as power generation and minerals extraction. In partnership with Czech firm Eutit, the company has also been pioneering the use of basalt in the renovation and restoration of sewer systems in central European following a series of successful projects in Prague. As a result of devastating floods, the city’s sewer system was extensively rebuilt and upgraded with basalt being used in a number of key locations to provide a new level of security to the system. More than a decade on, the new system continues to perform well and has set a standard that’s now been followed in other European cities. Well suited for the most demanding of applications, thanks to the partnership between Greenbank and Eutit, a wide range of basalt solutions are now available in the UK market. These include products and systems that bring a wide range of benefits to the industry, including: Basalt tiles that can also be used to line existing brickwork, a more cost-effective solution than full replacement, and their reduced drag co-efficient means improved flow – in effect a smaller-diameter pipe or tunnel lined with basalt can carry a higher volume of water than a larger one with traditional brick surfaces. The effective life expectancy of basalt-lined sewer systems is between 100 and 200 years, thanks to their excellent resistance to abrasion and chemical damage – as well as the rigours of high-pressure water jetting that’s often used to clear unwanted blockages. For larger round or ovoid systems, basalt can be used in the lower sections to deal with the wear and tear with concrete upper sections to provide optimum life performance. Alternatively, steel pipes lined with basalt can be produced up to 3000mm diameter producing a lighter therefore lower cost installation option to thick wall concrete. Ease of installation and reduced maintenance costs make basalt ideal for bottom gutters, branch pipes and tubes and slip-resistant elements for walkways, and Greenbank can also supply bespoke-shaped tiles to meet the unique requirements of individual clients. With manufacturing facilities in Derbyshire and Nottinghamshire, supported by the additional capacity and expertise provided by the latest addition to the group, Franklyn Yates Engineering, Greenbank is well placed to react quickly and efficiently to the needs of new and existing clients.

    Saint Gobain PAM UK logo

    Saint Gobain PAM UK

    United Kingdom

    Saint Gobain PAM UK is the premier supplier of ductile iron and cast iron products to the UK's key utilities, telecoms, highways, civil engineering, construction and housing companies. We’re a leading manufacturer of ductile iron access covers, gully gratings, and pressure pipeline systems, helping the UK’s utility, highways, telecoms and infrastructure network owners reduce their whole-life costs and carbon while improving their asset durability and health and safety standards. We proudly manufacture our solutions, which enables us to not only meet but exceed the most stringent safety, quality and environmental standards. This means all of our access covers, gully gratings, and surface boxes are 100% recyclable. By providing innovative and sustainable access covers, gully gratings and pipeline systems that are right the first time, our customers enjoy quality and durable solutions that solve their problems the first time they’re installed – backed by the experts who designed them. 👨‍🔬🔬🥼 Saint-Gobain PAM UK is part of the Saint-Gobain Group, which employs over 166,000 people in 75 countries. With the international support of parent company Saint-Gobain, we offer unrivalled technical support, a total solution approach and unparalleled quality and innovation. Our solutions include: Ductile iron access covers, gully gratings and kerbside drainage solutions Ductile iron water and sewer pipes, fittings, valves, couplings and adaptors

    Treatment Works Products/Services
    Networks - Sewerage
    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
    3rd Light Media Ltd logo

    3rd Light Media Ltd

    United Kingdom

    3rd Light Media provide technical documentation and design services for water and wastewater projects, both in the UK and internationally. We provide a range of documentation for projects, helping clients achieve their handover requirements and producing high quality documents which provide the end users with the information they need to operate and maintain the plants. We are a market leader in driving digital innovative solutions to our clients to ensure documentation is presented in new and dynamic ways, this includes development of web-based O&M manuals which can integrate with client I.T. systems such as SharePoint; Graphical design to enable data and documentation of assets on a site plan or P&ID to be available within just a few clicks of a button. Additionally, we have developed a QR coded asset tagging system and mobile App. Our services mean we can provide our clients with a single source for all handover documentation requirements. The services we can provide include: Operating and Maintenance Manuals (O&Ms) Site Operating Manual (SOM) Health & Safety Files Asset Data Registration Training Manuals Site Drawings (P&IDs, Process Flows, Site Layouts and Plans, GA’s, Single Line Diagrams and more) AutoCAD Drafting Services Additionally, we also provide a range of onsite services to further enhance being a one stop provider for all your project handover needs. Some of the onsite services we provide include: Asset Identification Tags (to meet all individual client specifications) Pipe Banding to BS1710 Site signage and labelling We also provide a range of design and pre-construction services, with experience when working with Tier 1 contractors at ECI / Outline Design stages of projects including: Functional Design Specifications Control Philosophies Factory Acceptance & Site Acceptance Tests for Software Testing Commissioning Plans and Sequencing Asset Condition Reports Verification Survey Works (Producing P&IDs, ICA and Electrical Design Proposals) We work as an integrated team with both contractors and clients to ensure all aspects of project handover are achieved to the highest standard. We are able to do this with our vast knowledge of individual water companies asset standards and specifications. We are also experienced in using portals such as TWEXnet, Asite, Aconex, Business Collaborator and Conject for uploading documents. Our team comprises of skilled and experienced site and process engineers with a vast knowledge of both water and wastewater treatment systems. Our team of engineers all hold EUSR Water Hygiene and CSCS cards as well as water company specific requirements such as the Thames Water Safety Passport. We also have an in-house graphic design team providing professionally drawn illustrations and drawings which are used within our documentation, helping to visualise written descriptions and processes. Our philosophy is to take the burden of producing documentation on projects away from our clients. Being skilled process engineers, we will visit sites to gather information and we work with your supply chain to coordinate the availability of all required documents and drawings, ensuring compliance with the end clients standards. We write all the technical content and detail to the highest standard, supported by expertly drawn diagrams and illustrations. Some of the water companies we have worked with include: Thames Water Affinity Water Yorkshire Water Southern Water Severn Trent South East Water United Utilities Welsh Water Bristol Water Essex & Suffolk Water Irish Water Haya Water We work both directly with water companies and Tier 1 and Tier 2 contractors. We work on projects of all sizes, from minor schemes to major £100+ million projects.

    Treatment Works Products/Services
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    Amiblu UK LTD logo

    Amiblu UK LTD

    United Kingdom

    If you knew there was a material out there with a proven track record worldwide for outperforming others, would you want to know more about it? Using cutting edge technology to meet the toughest challenges, Amiblu manufactures GRP pipelines and storage systems that last for generations and do not corrode. GRP is a resilient, composite material utilised in many aspects of construction and civil engineering to deliver long lasting infrastructure. The history of Amiblu’s GRP systems starts with the first production of centrifugal cast (CC) pipes in Basel in 1957 and continuous filament wound (FW) pipes in 1969 in Norway using top quality raw materials combined with glass fibres to create robust pipes and storage solutions. Over the past 60+ years, research and development, growth and investment now puts Amiblu at the forefront of GRP pipe production, with seven state of the art manufacturing facilities and a global network of licensed partners producing the two market leading names in GRP pipes – Flowtite (FW) and Hobas (CC). Amiblu takes environmental responsibility very seriously by developing systems that offer a number of benefits to asset owners who are faced with aging networks, growing cities, climate change and increases in demand. Challenging traditional materials, our products are corrosion and abrasion resistant, with excellent hydraulics, can be bespoke made to meet project requirements, are low-maintenance and engineered for 150 years’ service life. Products are manufactured for: Sewage & stormwater Hydropower Circular & non-circular pipeline rehabilitation Potable & raw water delivery Industrial processes Micro-tunnelling applications. The greenest product is the one you don’t have to replace.

    Networks - Water Supply
    Asset Maintenance & Rehabilitation
    Electrosteel Castings (UK) Ltd logo

    Electrosteel Castings (UK) Ltd

    United Kingdom

    Electrosteel Castings (UK) Ltd is a leading manufacturer of ductile iron pipes, fittings and ancillary pipeline products, supplying companies all around the globe. Our products fully comply with the many international and European standards for conveyance of potable drinking water, raw water and wastewater. We pride ourselves on providing a tailor-made solution that will meet your requirements, whatever the size or nature of your project. Working closely with the rest of the Electrosteel family, Electrosteel UK have the ability to manufacture, source, and consolidate product packages enabling our customers to have a single point of responsibility for the management and delivery of the materials ordered. This in turn ensures effective, on-time project completion and peace of mind. Electrosteel Castings (UK) is part of a company that has been engaged in the water infrastructure business for over fifty years. We cater to a large customer base in the UK, the Indian subcontinent, Southeast Asia, the Middle East, Europe, Africa, and the USA. We have fulfilled more than 10,000 water supply projects in which our ductile iron spun pipes and fittings were implemented. In the UK we produce pipes and fittings in the range DN80mm – DN1000m in accordance with the following European standards: EN 545 for water EN 598 for sewerage

    Treatment Works Products/Services
    Networks - Sewerage
    Trant Engineering Ltd logo

    Trant Engineering Ltd

    United Kingdom

    Trant provide high quality engineering and project delivery services to the municipal & industrial process & water treatment markets in the UK and Internationally. We have 60 years’ experience in the successful delivery of complex water, wastewater and process treatment solutions for the main UK process & water companies. We develop innovative, cutting edge process and water solutions using advanced technology. Working closely with our technology partner SFC Umwelttechnik, we are able to utilise proven advanced technology resulting in optimal solutions for our water and process industry clients in the UK and internationally. Our in-house design teams understand the stringent regulatory challenges faced by our clients and ensure that efficiency, resilience and sustainability are factored into all design solutions. Our design studio use the latest software including BIM, augmented and virtual reality to develop and detail high tech treatment process outputs. Our control & automation and offsite manufacturing & assembly facilities enable us to provide full in-house capability from project conception through to commissioning.

    Networks - Sewerage
    Accreditations
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    GRP and FRP Pipe Design Standards: Pressure Class, Stiffness, and Corrosion Resistance

    Glass Reinforced Plastic (GRP), also termed Fibre Reinforced Polymer (FRP) pipe, is manufactured by filament winding or centrifugal casting of glass fibre rovings in a thermoset resin matrix (isophthalic polyester, vinyl ester, or epoxy). Pressure classes range from PN 1 to PN 32 (bar) per ISO 10639 (underground water) and AWWA C950. Pipe stiffness (SN) classifies deflection resistance: SN 2,500 to SN 10,000 N per m2 for buried applications, selected based on soil loading, trench depth, and bedding class. Wall construction is typically dual-layer: structural wall (glass content 70 to 75 percent by weight) plus a resin-rich corrosion liner (glass content below 30 percent, minimum 2.5 mm thick).

    Design advantages over steel and ductile iron include: zero corrosion allowance (eliminates cathodic protection and coating maintenance), Manning roughness coefficient n = 0.009 (vs 0.013 for concrete, enabling smaller pipe diameter for equivalent flow), and weight savings of 70 to 80 percent versus steel (DN 1000 GRP pipe weighs approximately 120 kg per m vs 450 kg per m for steel). Hazen-Williams C-factor is 150 for GRP vs 100 to 120 for aged steel. Joints are typically butt-and-strap laminate or elastomeric coupling; restrained joints for pressure pipes use glass fibre tape wrap over the coupling.

    Temperature limits for standard polyester GRP are -20 to +80 degrees C; vinyl ester extends to 100 to 120 degrees C for industrial chemical service. Chemical resistance is resin-dependent: isophthalic polyester resists pH 2 to 12; vinyl ester resists concentrated acids and alkalis. GRP pipe complies with ISO 10639 (potable water, NSF 61 listed resin required), EN 1796, and AWWA C950. Cost per metre for DN 500 GRP is $80 to $150 installed versus $200 to $350 for ductile iron at the same diameter. Lifetime cost advantage from eliminated corrosion protection makes GRP preferred for aggressive soil and process chemical environments.

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    Frequently Asked Questions

    What is the difference between GRP and FRP pipe?

    GRP (Glass Reinforced Plastic) and FRP (Fibre Reinforced Polymer) are effectively synonymous terms for pipe manufactured by reinforcing a thermoset polymer resin matrix with glass fibres. GRP is the common European and water industry term; FRP is used in the US chemical and oil-and-gas sectors, where carbon fibre reinforcement may also be used (CFRP). Both refer to the same product family when glass fibre is the reinforcement. The key variables are resin type (polyester, vinyl ester, epoxy), glass content (60 to 75 percent by weight for structural layer), and manufacturing method (filament winding for pressure pipe, centrifugal casting for gravity pipe DN 300 to DN 3600).

    What pressure can GRP pipe handle?

    GRP pipe pressure ratings range from PN 1 to PN 32 (1 to 32 bar working pressure) per ISO 10639 and AWWA C950, with short-term hydrostatic burst pressure typically 2.5 times the rated working pressure. For water mains in the DN 300 to DN 1,200 range, PN 10 to PN 16 (10 to 16 bar) is the most common specification, covering most distribution and transmission main pressures. For fire protection service (requiring 12 bar working pressure and 24 bar hydrostatic test), PN 16 pipe is standard. Surge pressure must be evaluated separately: GRP has a lower elastic modulus than steel, resulting in lower surge pressures for the same flow change but potentially higher deflection at unsupported spans.

    How is GRP pipe joined?

    Four joint types are used in practice. Butt-and-strap (BAS) joints: glass fibre tape laminated over the pipe ends using the same resin, providing full structural continuity and pressure capacity equal to the pipe barrel. Suitable for all buried and aboveground pressure applications. Elastomeric coupling joints: a double-socket sleeve with EPDM or NBR ring seals slipped over pipe ends; quick to install but not restrained against longitudinal pull-out. Flanged joints: filament-wound GRP flanges laminated to pipe ends, used at valves, bends, and equipment connections. Adhesive bonded (for structural GRP fittings): isophthalic resin adhesive applied to socket and spigot. BAS joints are specified for large-diameter water transmission mains and chemical pipelines requiring zero-leak integrity.

    Can GRP pipe be used for hot water or steam?

    Standard isophthalic polyester GRP pipe is limited to 60 to 80 degrees C continuous service. Vinyl ester GRP pipe (e.g. Derakane 510C or equivalent) is rated to 100 to 120 degrees C. Epoxy GRP pipe with post-cure achieves 130 to 150 degrees C. For steam or condensate at pressure, GRP is not appropriate above 120 degrees C; high-temperature steel or duplex stainless is preferred. Thermal expansion of GRP is 2 to 3 times that of steel (alpha = 20 to 25 times 10 to the -6 per degree C), so expansion loops or bellows must be incorporated in aboveground hot water lines. For geothermal brine at 50 to 80 degrees C, standard GRP vinyl ester with appropriate chemical liner is a common and cost-effective choice.

    Case Study·Industrial process water
    Challenge

    A chemical manufacturing site in Teesside needed to replace 4.5 km of aging 316SS water supply pipework (DN 300 to DN 600) carrying cooling water with pH 4.5 to 5.5 and high chloride content (800 mg/L). The steel pipework was suffering external corrosion from the aggressive soil environment and internal pitting at weld zones. Cathodic protection was ineffective due to complex pipework topology.

    Approach

    Specified a filament-wound vinyl ester GRP pipeline (ISO 10639 PN 10, SN 10,000) with isophthalic corrosion liner (3 mm, under 30 percent glass content) for the entire replacement. Joints used butt-and-strap laminate construction. Full-bore ball valves were specified in UPVC-lined ductile iron to match GRP for corrosion resistance. Manning coefficient n=0.009 allowed a reduction from DN 350 to DN 300 in two sections without hydraulic penalty.

    Outcome

    Installed 2025 GBP per m versus 3,400 GBP per m for equivalent 316SS replacement (41 percent cost saving). Zero cathodic protection cost. Manning n=0.009 versus 0.014 for the aged steel gave 12 percent better hydraulic capacity at design flow. 50-year design life confirmed by resin specialist chemical resistance assessment. Installation completed in 6 months versus 9 months estimated for steel (lighter weight enabling faster installation).

    Questions to Ask Shortlisted Providers

    1. 1

      What resin system do you specify for our fluid chemistry (pH, chloride content, oxidising agents), and do you have a chemical resistance table from the resin manufacturer for our specific conditions?

      GRP performance is entirely resin-dependent. Isophthalic polyester is suitable for neutral pH water but inadequate for pH below 4 or high-chloride/oxidising environments. Vinyl ester provides broader chemical resistance. The resin manufacturer's chemical resistance table (which cites temperature-adjusted permeability coefficients) is the only reliable design basis; generic statements of 'acid-resistant' are insufficient.

    2. 2

      What is the corrosion liner specification (glass content, thickness, resin type), and how is the liner quality verified during manufacturing?

      The corrosion liner (high-resin-content inner layer) provides the primary chemical resistance. It must have glass content below 30 percent by weight and minimum thickness of 2.5 mm per ISO 10639. Liner quality is verified by acid-immersion tests on production samples. Insufficient liner thickness or excess glass content creates pathways for chemical attack that can cause catastrophic pipe failure without visual warning.

    3. 3

      What is the pipe stiffness class (SN), and has it been selected for our trench depth, soil type, and traffic loading using the modified Iowa formula or equivalent?

      GRP buried pipe deflects under soil and traffic load. Insufficient stiffness causes ring deflection beyond 5 percent (the general limit for GRP per ISO 10639), leading to joint separation and liner cracking. The stiffness class must be selected using soil-load calculations that account for trench width, compaction, groundwater, and surface traffic. SN 2,500 is suitable for shallow low-traffic installations; SN 10,000 for deep or heavy-traffic locations.

    4. 4

      What joint type are you proposing for the buried sections, and how will you test joint integrity before backfilling?

      Elastomeric coupling joints can pull out under longitudinal loading (thermal contraction, soil movement, surge pressure). BAS laminate joints provide full structural continuity and axial restraint. For PN 10 buried transmission mains, restrained joints are required at bends and tees. Pressure testing to 1.5 times working pressure before backfilling (per ISO 10639) is the standard acceptance test for buried GRP pipelines.

    5. 5

      What product-specific Hazen-Williams C-factor or Manning roughness coefficient does your pipe achieve after 10 years in service, and do you have long-term monitoring data from comparable installations?

      New GRP pipe achieves n=0.009 or C=150, but if the corrosion liner degrades or biological fouling accumulates on the pipe wall (possible if water is not disinfected), roughness increases. Long-term hydraulic performance data from comparable chemical plants confirms that the initial design capacity is maintained over the pipe life and validates the hydraulic model basis.

    What Drives Cost in This Category

    Diameter and pressure class

    GRP pipe material cost (DN 300, PN 10): approximately 80 to 120 GBP per m. DN 600, PN 10: approximately 200 to 320 GBP per m. DN 1,200, PN 10: approximately 500 to 800 GBP per m. Pressure class increment from PN 10 to PN 16 adds 15 to 25 percent to material cost. These costs are typically 30 to 50 percent below equivalent 316SS and 10 to 20 percent below coated ductile iron, the primary alternatives in corrosive-service pipework.

    Resin type and corrosion liner specification

    Isophthalic polyester GRP is the standard and cheapest option for neutral-pH water service. Vinyl ester (for pH 2 to 12, solvent service) adds 15 to 25 percent to material cost. Epoxy (for high-temperature, solvent-rich, or highly corrosive service) adds 30 to 50 percent. Over-specifying resin type adds unnecessary cost; under-specifying risks rapid corrosion liner degradation and pipe failure within 5 to 10 years.

    Joint type and installation method

    Elastomeric coupling joints are the fastest to install (5 to 8 minutes per joint, no curing time) and 20 to 30 percent cheaper than BAS joints. BAS joints require skilled laminators and 4-hour cure time: installation productivity is 25 to 40 percent lower. However, BAS is mandatory for restrained-joint applications (high-pressure, thermally loaded, or axially constrained runs). Specifying BAS throughout a large project where couplings would suffice significantly inflates installation cost.

    Trench and installation conditions

    GRP pipe's 70 to 80 percent weight saving versus steel or ductile iron reduces crane and lifting equipment requirements, typically saving 10 to 20 percent on installation cost per metre. However, GRP requires more careful handling (no slings under bare pipe, no point loading) and bedding material specification (sand or fine gravel surround to 150 mm above pipe, no stones above 12 mm) that adds 5 to 10 percent to trench preparation cost versus steel pipe.

    Key Regulations & Standards

    ISO 10639:2017 -- GRP Pipe for Underground and Above-Ground Water Applications

    ISO 10639 is the primary international standard for glass-reinforced thermosetting plastics (GRP) pipes for water supply and drainage buried underground. It specifies pressure classes (PN 1 to PN 32), nominal stiffness classes (SN 1,250 to SN 10,000 N/m2), hydrostatic design basis, corrosion liner requirements, and test methods including hydrostatic, ring stiffness, and beam loading. UK water company procurement specifications reference ISO 10639 as the baseline.

    WS(WQ)R 2016 and NSF/ANSI 61 -- Potable Water Contact Approval

    GRP pipes carrying potable water must use resins and process materials that comply with the Water Supply (Water Quality) Regulations 2016 and DWI Approved Products Guidance. NSF/ANSI 61 certification is accepted by DWI as equivalent evidence of suitability for potable water contact. The certificate must cover the specific resin formulation and cure cycle used in the manufactured pipe.

    Pressure Systems Safety Regulations 2000 (PSSR) -- GRP Pressure Pipework

    GRP pressure pipework above the PSSR 2000 pressure-volume threshold (pressure in bar times volume in litres above threshold values) is subject to the Pressure Systems Safety Regulations 2000 and requires a Written Scheme of Examination and periodic statutory inspection by a competent person. GRP pipes above PN 10 in process chemical service are typically within PSSR scope. The Written Scheme must account for GRP-specific failure modes (delamination, corrosion liner degradation) as well as conventional pressure testing.

    EN 1796:2006 -- GRP Pipes for Non-Pressure Drainage and Sewer Applications

    GRP gravity sewer and drain pipes in the UK are specified to EN 1796 (equivalent to ISO 10466 and ASTM D3262). EN 1796 covers nominal stiffness classes SN 1,250 to SN 10,000, nominal size DN 100 to DN 4,000, and joint types (elastomeric coupling, BAS). For GRP gravity sewers, the joint tightness test per EN 1277 (hydrostatic or air test at 0.1 bar) must be completed section by section before backfilling.

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