Code-stamped pressure vessel fabricators for filters, contactors, and hydropneumatic service in water systems.

    Find a Pressure Vessel Provider

    Matched providers: 18

    Top countries: United Kingdom, China

    Popular technologies: Pressure Filters, Cartridge Filters

    Pressure Vessel Design, Manufacture, and Testing Standards for Water Treatment Applications

    Pressure vessels in water treatment include filter vessels (multimedia, GAC, softener resin), RO/NF membrane housings, pressure tanks (hydropneumatic, bladder, expansion), chemical dosing receivers, and bespoke reactors. Design codes: UK/EU: Pressure Equipment Directive (PED 2014/68/EU, UKPEDD post-Brexit); PED Category I to IV based on product PS times V (pressure times volume, bar.litres); BS EN 13445 (Unfired Pressure Vessels) is the harmonised standard; manufacture by CE/UKCA-marked manufacturers. US: ASME Boiler and Pressure Vessel Code (BPVC) Section VIII Division 1 (most vessels less than 1,500 psi) or Division 2 (higher pressure, higher design factor); ASME U stamp required for US market. Australia: AS 1210 (Pressure Vessels); Canada: ASME or provincial pressure vessel codes. Common water treatment vessel materials: carbon steel (A516-70 per ASME); stainless steel (304/316L per ASTM A240); fibreglass reinforced plastic (FRP, ASME RTP-1 or ASTM D3299); high-density polyethylene (HDPE, PE100); GRP with internal liner (for aggressive water chemistry).

    Membrane pressure vessels (MPVs) for RO/NF/UF systems house spiral-wound membrane elements: typical 4-inch diameter (1 to 6 elements per vessel) and 8-inch diameter (3 to 7 elements per vessel) for standard commercial and industrial RO. MPV standards: ASME B31.3 (piping and pressure connections); American Water Works Association (AWWA) C110; manufacturer-specific ratings (max 1,000 to 1,200 psi operating pressure for SWRO). MPV materials: fibreglass reinforced epoxy (most common, Pentair, Protec Arisawa, Codeline brands); stainless steel 316L for aggressive chemistries or high-pressure applications; working pressure ratings: 150 psi (10.3 bar) for BWRO, 300 psi (20.7 bar) for SWRO, 1,200 psi (82.7 bar) for high-pressure applications. MPV selection: burst pressure minimum 3 to 4 times operating pressure per PED safety factor requirements; Permeate port location (centre or end) matches membrane element configuration. Hydrostatic testing: each vessel tested at 1.5 times MAWP (Maximum Allowable Working Pressure) before shipment per ASME.

    Pressure vessel testing, inspection, and in-service management: UK statutory requirements under PSSR 2000 (Pressure Systems Safety Regulations 2000, SI 2000/128): written scheme of examination required for all pressure vessels above 0.5 bar above atmospheric and greater than 250 bar.litres PS.V; examination by competent person (chartered engineer or approved body: Lloyd's, Zurich, HSB, Bureau Veritas); frequency: internal examination (in-service inspection) typically every 2 to 4 years; thorough examination (internal + hydraulic test) every 4 to 10 years per written scheme. European In-Service Inspection: PED Article 14 and EN 13445-5 provide design verification; in-service inspection per national regulations (UK: PSSR, Germany: BetrSichV, France: CODAP). Inspection methods: visual (VT); hydraulic pressure test at 1.25 to 1.5 times design pressure; ultrasonic thickness measurement (UTM) for corrosion assessment; acoustic emission (AE) testing for in-service damage detection without decommissioning. Corrosion allowance: carbon steel vessels designed with 1.5 to 3 mm corrosion allowance; inspection to measure actual wall thickness remaining. Vessel repair: ASME PCC-2 (Repair of Pressure Equipment and Piping) governs temporary and permanent repairs.

    Frequently Asked Questions

    What design code applies to pressure vessels in the UK?

    UK pressure vessel design is governed by: (1) Pressure Equipment (Safety) Regulations 2016 (UK PSSR, implementing PED 2014/68/EU post-Brexit via UKCA marking): categorises pressure equipment by PS times V (pressure times volume, bar.litres) and fluid hazard; Category I to IV, with increasing conformity assessment requirements; above 0.5 bar and simple vessels (SPVC 2014/29/EU for cylinders); (2) BS EN 13445 (Unfired Pressure Vessels, Parts 1 to 6): the harmonised design standard; covers design by formula and design by analysis; specifies joint efficiency factors, NDT requirements, and test pressures; (3) For vessels designed before Brexit or for export to EU: PED 2014/68/EU and CE marking still applies; UKCA is the UK-market equivalent from January 2023; (4) PSSR 2000 (Pressure Systems Safety Regulations, SI 2000/128): governs in-service use, written scheme of examination, and periodic inspection. Alternative design codes recognised in UK: ASME VIII Division 1/2 (widely used for imported vessels); PD 5500 (superseded BS 5500, withdrawn, still used as technical reference); CODAP (French); AD Merkblatt 2000 (German).

    What is a hydrostatic pressure test?

    A hydrostatic pressure test verifies the structural integrity and leak-tightness of a pressure vessel or piping system by filling it with water (or other liquid) and pressurising to a test pressure above normal working pressure. Test pressure: BS EN 13445 requires pt = 1.25 times PS times (f at test temperature / f at design temperature) for steel vessels; ASME VIII Division 1: 1.3 times MAWP; PED: minimum 1.25 times PS. Procedure: (1) Fill vessel completely with water, ensuring all air is vented; (2) Pressurise slowly (typically less than 5 percent of test pressure per minute) using calibrated hydraulic pump and two independent pressure gauges; (3) Hold at test pressure for minimum 30 minutes (ASME) to 1 hour (EN 13445); (4) Inspect all welds, flanges, and fittings for leaks, visible deformation, or unusual sounds; (5) Record test date, pressure, duration, and inspector name in vessel documentation. Pass criteria: no visible leaks, no deformation, no failure. New vessel: factory hydro test before supply. In-service: PSSR 2000 periodic examination (1.25 to 1.5 times MAWP) as part of written scheme. Alternative: pneumatic test (compressed air or nitrogen) at 1.1 times MAWP where hydro test is not practicable - higher risk, requires safety precautions.

    How often do pressure vessels need inspecting?

    UK inspection frequency under PSSR 2000 is determined by the Written Scheme of Examination (WSE) prepared by a Competent Person for each individual vessel or system. Typical intervals: new vessel: initial in-service examination within 12 months of first use; standard process vessel (up to 50 bar, carbon steel, non-corrosive duty): internal examination every 2 to 4 years; external examination every 6 to 12 months; hydraulic test every 5 to 10 years. Aggressive duty (corrosive, high temperature/pressure, cyclic loading): internal examination every 1 to 2 years; hydraulic test every 4 to 6 years. Safe operating limits (SOL): vessel must not be operated above the pressure, temperature, flow, and composition limits defined in the WSE. Consequences of non-compliance: PSSR 2000 is enforced by HSE; improvement notices and prohibition notices issued; prosecution for serious breaches (maximum GBP 20,000 fine in magistrates court, unlimited in Crown Court, 2 years imprisonment for individuals). EU: PED in-service inspection governed by national regulations per PED Article 14 (Directive 2014/68/EU); intervals typically comparable to UK PSSR. US: OSHA 29 CFR 1910.217 and ASME in-service inspection codes govern pressure vessel inspection frequencies.

    What materials are best for pressure vessels in water treatment?

    Material selection for water treatment pressure vessels: (1) Carbon steel (A516 Grade 70, S355 equivalent): most economic for clean service, high pressure; minimum 1.5 to 3 mm corrosion allowance for mildly corrosive water; internal coating (epoxy, fusion-bonded, or rubber lining) for aggressive water; widely used for filters, softeners, backwash tanks; (2) Stainless steel 316L (S31603, 1.4404): superior corrosion resistance for chloride-containing water (Pitting Resistance Equivalent PRE greater than 25); no corrosion allowance required; UPW applications, RO cartridge filter housings, chemical dosing; higher cost than carbon steel (approximately 3 to 5 times); (2a) Duplex stainless steel (2205, 1.4462, PRE greater than 35): seawater desalination applications; highly resistant to chloride pitting; (3) Fibreglass reinforced plastic (FRP, GRP): corrosion-resistant, lightweight; BS 4994 (design and construction); suitable for aggressive water, acids, and caustic; common for GAC/media filter vessels, chemical storage; limitations: lower pressure rating than metal for same wall thickness; temperature limit approximately 70 to 100 degrees C; (4) HDPE/PE100: low pressure applications (less than 16 bar), smaller vessels; chemical dosing day tanks; (5) Titanium Grade 2: seawater desalination membrane housings; cost-prohibitive for most applications but unmatched corrosion resistance.

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    Pressure Vessel Companies

    Code-stamped pressure vessel fabricators for filters, contactors, and hydropneumatic service in water systems.

    18 providers

    This page is a good fit if you need:

    • Pressure Filters or Cartridge Filters capabilities
    • Suppliers with accreditations sector experience
    • Providers operating in United Kingdom or China
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    Find a Pressure Vessel Provider

    Showing 1-18 of 18

    18 results from 18 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
    Brine Consulting logo

    Brine Consulting

    Verified
    Netherlands1-50 employees
    Mechanical Vapor Recompression (MVR) · Atmospheric Evaporator · Spray Evaporator +130 more
    apac · china · europe +3 more

    BRINE CONSULTING delivers senior-level strategy, technical design, and actionable insight across the full lifecycle of water-related challenges. We support clients with advisory and due diligence, advanced brine management and resource recovery, industrial and municipal water reuse, and MLD/ZLD systems. Our team also leads ESG and climate-resilience strategy, innovation scouting, and international development and PPP advisory. With deep specialization in desalination, brine valorization, circular economy models, and high-impact infrastructure, we help organizations turn water and waste streams into opportunities, providing clear thinking, rapid delivery, and solutions built for real-world results.

    Activated Carbon Filtration
    Reverse Osmosis (RO) Systems
    Ultrafiltration (UF) Systems
    +85 more
    manufacturing
    energy-production
    BEL Composite Ibérica S.L. logo

    BEL Composite Ibérica S.L.

    Spain51-200 employees
    Pressure Filters · Ion Exchange · Reverse Osmosis (RO) +2 more
    europe

    BEL Composite Ibérica S.L. specializes in the production of advanced composite vessels, catering to industries such as water treatment, energy, and manufacturing. With state-of-the-art facilities, BEL designs and manufactures products compliant with ASME standards, serving a diverse range of applications across Europe.

    Storage Tanks and Reservoirs
    Utilities
    Manufacturing
    Bona Water Purification logo

    Bona Water Purification

    China1-50 employees
    Cartridge Filters · Bag Filters · Pressure Filters +1 more
    china

    Bona Water Purification specializes in manufacturing stainless steel water filter housings, providing essential components for effective water filtration and treatment systems. Based in China, they cater to various industries, ensuring clean and safe water solutions.

    Bag and Cartridge Filtration
    Construction and Installation
    Utilities
    Manufacturing
    Protec Arisawa Europe S.A. logo

    Protec Arisawa Europe S.A.

    Spain200+ employees
    Filtration
    apac · europe · mea

    Protec-Arisawa, one of the world leaders in manufacturing of FRP Pressure vessels. A perfect synergy of operational excellence, large capacity and technology. Small industrial or large desalination projects, Protec membrane pressure vessels will reduce your total system cost. Our Team, together with you, will find the innovative solutions with advanced production technologies and product quality that will create value for your business. Side port vessels & end ports : 4”, 8”, 9”, 11”, 16”

    Reverse Osmosis (RO)
    Construction and Installation
    Manufacturing
    Utilities
    Canature Huayu Environmental Products Co., Ltd. logo

    Canature Huayu Environmental Products Co., Ltd.

    China200+ employees
    Pressure Filters · GAC Pressure Vessels · Ion Exchange Resins +2 more
    apac · china

    Canature Huayu Environmental Products Co., Ltd., founded in 1995, is a leading manufacturer of composite material pressure tanks and water treatment components. Based in Jiangsu, China, the company serves over 100 countries, providing certified solutions for industrial, agricultural, and residential water treatment needs.

    Storage Tanks and Reservoirs
    Manufacturing
    Utilities
    Compose It - Innovative Tanks logo

    Compose It - Innovative Tanks

    France1-50 employees
    Filtration
    europe

    Compose It - Innovative Tanks specializes in the development of next-generation composite pressure vessels, catering to industries such as construction, manufacturing, and utilities. Based in France, the company focuses on providing cutting-edge equipment and technology solutions for water management and filtration systems.

    Storage Tanks and Reservoirs
    Construction and Real Estate
    Manufacturing
    Impact Filtration™ logo

    Impact Filtration™

    United States51-200 employees
    Filtration · Cartridge Filters
    north-america

    Impact Filtration™, based in the San Francisco Bay Area, is a leader in industrial filtration solutions, offering advanced FRP pressure vessels, innovative cartridge filters, and non-metallic solutions. With over 120 years of collective expertise, we engineer sustainable solutions that enhance efficiency and optimize industrial processes globally.

    Bag and Cartridge Filtration
    Storage Tanks and Reservoirs
    Manufacturing
    Utilities
    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
    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.

    SILOTANK logo

    SILOTANK

    United Kingdom

    From industrial water tanks to turnkey odour control systems, we are the only UK manufacturers to offer 3 axis helical filament winding, providing high quality plastic storage tanks to the water and waste, microelectronics, chemical, pharmaceutical, paper & pulp, food processing, drinks and brewery industries. We are a leading manufacturer in the UK and Ireland for chemical, liquid and drinking water storage tanks, bunded storage tanks, process vessels, pressure vessels and environmental systems. Flexible in our approach to business and providing strong technical support, we are dedicated to supplying our customers the high quality product and service that you would expect from a market leader in specialist tanks. We manufacture to design standards BS4994:1987 , BS EN ISO 12573 & DVS2205 using FDA, WRAS and DWI approved materials. Our extensive ‘in house’ capabilities include mechanical engineering design along with chemical process design these activities are supported by a CAD network operating with AutoCAD 2D & Solid Works 3D software, FEA & Laminate Theory Analysis offering clients a complete service. We are innovative and continue to advance using the latest technology and materials used within the industry and have installed a CNC router and laser machine to support business development. RANGE OF EQUIPMENT & SERVICES OFFERED Storage, mixing and process tanks/vessels. Ranging in capacities from 50 litres to 200,000 litres. Tanks are manufactured using a variety of thermoplastics and GRP materials to suit the particular application including HDPE, polypropylene, UPVC/GRP (Aqua Pure – WRAS approved), polypropylene/GRP. The majority of our products are ‘bespoke’ designed and manufactured to suit the clients specific application. Odour and chemical fume scrubbing towers. Our ‘bespoke’ design and manufacture odour or chemical fume abatement equipment to suit most environmental applications. Our site teams are fully trained and able to complete on site installation within Ireland & UK including offloading, positioning, bolting down, assembly of any ancillary access steelwork as well as thermoplastic pipework and ductwork installations.

    Accreditations
    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
    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
    Alpha Plus Ltd logo

    Alpha Plus Ltd

    United Kingdom

    Founded in 1987 Alpha Plus Limited have been providing quality pipework, fabrication and installation of pipework, structures and mechanical plant for the utility, waste management, industrial / commercial and manufacturing sectors. Alpha Plus is committed to providing clients with innovative, cost effective, high quality solutions. We work closely with clients providing design, fabrication and installation to a high quality using approved standards and up to date technologies. We provide a wide range of services with a wealth of experience in the following areas: Pipework. Installation. Structural. Design and project management. Site Maintenance. Alpha Plus has successfully completed numerous contracts, varying in size from £10,000 to £3M+ , usually as lead mechanical installer of varying values in the following areas. Potable Water The installation of new and refurbishment of existing filters (RGF, DAF, GAC & RO), chemical dosing equipment and LP Block/Leopold flooring. Works include manufacture and installation of: Filter internals. Aeration and process pipework. Access steelwork. Launders. Weir plates. Installation of pumps, blowers and associated mechanical packages, trough plates, media and penstocks. Wastewater Installation of various designs of deep beds filters, submerged aeration filters, sequencing batch reactors, digesters, activated sludge plant, tertiary filters, centrifuges, screens, classifiers. Works include manufacture and installation of: Filter internals. Aeration and process pipework. Access steelwork. Launders. Weir plates. Installation of pumps, blowers and associated mechanical packages, trough plates, media and penstocks. Waste to Energy/Power Generation Installation of biogas CHP systems, waste incineration plants, electrostatic precipitator installations, gas scrubber installations, digester heating/circulation and internals. Works include manufacture and installation of: High pressure super heated/saturated and low pressure steam. Natural gas. Fuel oil. Compressed/instrument air. Chemical dosing pipework. Access and support structures. Pipe bridges. Large bore ducting up to 2000mm (mild steel and stainless). Ash transfer systems. GRP acid/alkaline pipework. Installation of pumps, driers, scrubber vessels, tanks and associated mechanical packages.

    Mapping & Modelling
    Accreditations
    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
    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
    ABC Stainless Ltd logo

    ABC Stainless Ltd

    United Kingdom

    ABC Stainless Ltd (formed in 1981) are a specialist stainless steel company, offering a full range of services including design, manufacture, supply, installation and commissioning to main contractors and Water Authorities, in the Water Industry. We supply a diverse range of stainless steel products to both WTW and WwTW, including our unique ‘Weldless Collar Pipe System’. This system minimises site fabrication and attendance, supplying prefabricated pipe spools for installation. We welcome enquiries relating to both sheet, plate & tube in all grades of stainless steel including exotic and aluminum, manufacturing stainless steel pipework systems (metric, schedule, dairy etc.), biogas systems, hygienic tanks, pressure & vacuum vessels, platforms, launders, pen stocks, screens, skid process units, weirs etc. DWI Approval We have ISO 9001:2008 accreditation and Drinking Water Inspectorate (DWI 56.4.516) manufacturing approval for our ‘Weldless Collar Pipe System’, and ABC Storage, Process Tanks & Vessels, this is under regulation 31(4)(a) of the Water Supply (Water Quality) regulations 2000 No.3184 & the Water Supply (Water Quality) regulations 2001(Wales) No.3911. In all cases, products are manufactured specifically for each project after full discussion with our clients and our own design office. We offer a full design & draughting service using the latest 3D modelling software. Material certification, quality plans, procedures, employee certification and testing are available upon request, with third party Insurer witness testing where required. We offer a range of material finishes including bead blast, bright (mirror) polished, satine (brushed) polished and 2B.

    Renewables & Energy Management
    Accreditations
    Spray Nozzle People logo

    Spray Nozzle People

    United Kingdom

    Suppliers of spray systems and solutions, including the StormBlaster™ stormwater attenuation tank cleaning system, the ScreenBlaster CSO screen cleaning head and specialised spray solutions for odour control, foam suppression and other water and wastewater applications. There are many applications for spray nozzles and systems within the water and wastewater treatment sector. SNP have worked on projects for most of the main water suppliers in the UK & Ireland as well as with many in Europe and beyond. We have listed some key applications for spray nozzles below. For a full list of applications and for further details on key applications, follow the menu to the right. Cleaning systems The United Kingdom’s water industry is poised for its most ambitious transformation yet under the AMP8 (Asset Management Period 8) investment cycle, which runs from 2025 to 2030. Backed by an unprecedented £108 billion investment, the largest in the sector’s history, AMP8 is focused not only on maintaining and upgrading ageing infrastructure but also on addressing growing environmental and regulatory challenges. A significant £11 billion of this total has been earmarked specifically for stormwater and sewage spill mitigation, reflecting mounting pressure from regulators, the public, and environmental groups to curb pollution in rivers, lakes, and coastal waters. At the heart of this environmental push lies the urgent need for more stormwater retention tanks and combined sewage overflow (CSO) systems. It is estimated that some 2,000 such systems will need to be updated, refurbished or built in the AMP round of funding. This stormwater management infrastructure is vital if the target of reducing spills and sewage discharges into waterways by 44% is to be met. Much of this new infrastructure will require specialised cleaning systems. Storm water attenuation tanks can cause serious smell pollution if left improperly cleaned after usage. The StormBlaster tank cleaning system is a more effective alternative to tipping buckets, swirl eductors and manual entry cleaning. Screen cleaning Combined Sewer Overflows (CSOs) are a key feature of combined sewer systems, where rainwater and wastewater share the same pipework. During heavy rainfall, these systems can become overwhelmed without proper control measures. CSO chambers manage excess flows by allowing water levels to rise and diverting surplus into overflow pipes. A crucial component of CSOs is the screening system, which traps solids and keeps them within the sewer network. This prevents solid waste from entering local waterways and protects the environment. Foam control The formation of a stable foam in the water treatment process is a common problem. Foam can occur in aeration tanks, anaerobic digesters or secondary clarifiers. Foam is undesirable because it can overflow vessels, create slippery and unsafe working conditions, interfere with processing, damage materials, and cause tanks to drain and dry slowly. Controlling foam can be accomplished by spraying liquid onto the pool, vessel, or reservoir’s surface and allowing the spray’s droplets to impact the foam bubbles, causing them to break. Spray nozzle arrays positioned above fluid level can be used to knock back the foam and keep it under control. Odour control The use of sprays to knock down and neutralise odour is a common application for our spray nozzles. Nozzles are either used to directly treat odour particles in the air or as part of scrubber systems.

    Treatment Process Technologies
    Accreditations

    Pressure Vessel Design, Manufacture, and Testing Standards for Water Treatment Applications

    Pressure vessels in water treatment include filter vessels (multimedia, GAC, softener resin), RO/NF membrane housings, pressure tanks (hydropneumatic, bladder, expansion), chemical dosing receivers, and bespoke reactors. Design codes: UK/EU: Pressure Equipment Directive (PED 2014/68/EU, UKPEDD post-Brexit); PED Category I to IV based on product PS times V (pressure times volume, bar.litres); BS EN 13445 (Unfired Pressure Vessels) is the harmonised standard; manufacture by CE/UKCA-marked manufacturers. US: ASME Boiler and Pressure Vessel Code (BPVC) Section VIII Division 1 (most vessels less than 1,500 psi) or Division 2 (higher pressure, higher design factor); ASME U stamp required for US market. Australia: AS 1210 (Pressure Vessels); Canada: ASME or provincial pressure vessel codes. Common water treatment vessel materials: carbon steel (A516-70 per ASME); stainless steel (304/316L per ASTM A240); fibreglass reinforced plastic (FRP, ASME RTP-1 or ASTM D3299); high-density polyethylene (HDPE, PE100); GRP with internal liner (for aggressive water chemistry).

    Membrane pressure vessels (MPVs) for RO/NF/UF systems house spiral-wound membrane elements: typical 4-inch diameter (1 to 6 elements per vessel) and 8-inch diameter (3 to 7 elements per vessel) for standard commercial and industrial RO. MPV standards: ASME B31.3 (piping and pressure connections); American Water Works Association (AWWA) C110; manufacturer-specific ratings (max 1,000 to 1,200 psi operating pressure for SWRO). MPV materials: fibreglass reinforced epoxy (most common, Pentair, Protec Arisawa, Codeline brands); stainless steel 316L for aggressive chemistries or high-pressure applications; working pressure ratings: 150 psi (10.3 bar) for BWRO, 300 psi (20.7 bar) for SWRO, 1,200 psi (82.7 bar) for high-pressure applications. MPV selection: burst pressure minimum 3 to 4 times operating pressure per PED safety factor requirements; Permeate port location (centre or end) matches membrane element configuration. Hydrostatic testing: each vessel tested at 1.5 times MAWP (Maximum Allowable Working Pressure) before shipment per ASME.

    Pressure vessel testing, inspection, and in-service management: UK statutory requirements under PSSR 2000 (Pressure Systems Safety Regulations 2000, SI 2000/128): written scheme of examination required for all pressure vessels above 0.5 bar above atmospheric and greater than 250 bar.litres PS.V; examination by competent person (chartered engineer or approved body: Lloyd's, Zurich, HSB, Bureau Veritas); frequency: internal examination (in-service inspection) typically every 2 to 4 years; thorough examination (internal + hydraulic test) every 4 to 10 years per written scheme. European In-Service Inspection: PED Article 14 and EN 13445-5 provide design verification; in-service inspection per national regulations (UK: PSSR, Germany: BetrSichV, France: CODAP). Inspection methods: visual (VT); hydraulic pressure test at 1.25 to 1.5 times design pressure; ultrasonic thickness measurement (UTM) for corrosion assessment; acoustic emission (AE) testing for in-service damage detection without decommissioning. Corrosion allowance: carbon steel vessels designed with 1.5 to 3 mm corrosion allowance; inspection to measure actual wall thickness remaining. Vessel repair: ASME PCC-2 (Repair of Pressure Equipment and Piping) governs temporary and permanent repairs.

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    Frequently Asked Questions

    What design code applies to pressure vessels in the UK?

    UK pressure vessel design is governed by: (1) Pressure Equipment (Safety) Regulations 2016 (UK PSSR, implementing PED 2014/68/EU post-Brexit via UKCA marking): categorises pressure equipment by PS times V (pressure times volume, bar.litres) and fluid hazard; Category I to IV, with increasing conformity assessment requirements; above 0.5 bar and simple vessels (SPVC 2014/29/EU for cylinders); (2) BS EN 13445 (Unfired Pressure Vessels, Parts 1 to 6): the harmonised design standard; covers design by formula and design by analysis; specifies joint efficiency factors, NDT requirements, and test pressures; (3) For vessels designed before Brexit or for export to EU: PED 2014/68/EU and CE marking still applies; UKCA is the UK-market equivalent from January 2023; (4) PSSR 2000 (Pressure Systems Safety Regulations, SI 2000/128): governs in-service use, written scheme of examination, and periodic inspection. Alternative design codes recognised in UK: ASME VIII Division 1/2 (widely used for imported vessels); PD 5500 (superseded BS 5500, withdrawn, still used as technical reference); CODAP (French); AD Merkblatt 2000 (German).

    What is a hydrostatic pressure test?

    A hydrostatic pressure test verifies the structural integrity and leak-tightness of a pressure vessel or piping system by filling it with water (or other liquid) and pressurising to a test pressure above normal working pressure. Test pressure: BS EN 13445 requires pt = 1.25 times PS times (f at test temperature / f at design temperature) for steel vessels; ASME VIII Division 1: 1.3 times MAWP; PED: minimum 1.25 times PS. Procedure: (1) Fill vessel completely with water, ensuring all air is vented; (2) Pressurise slowly (typically less than 5 percent of test pressure per minute) using calibrated hydraulic pump and two independent pressure gauges; (3) Hold at test pressure for minimum 30 minutes (ASME) to 1 hour (EN 13445); (4) Inspect all welds, flanges, and fittings for leaks, visible deformation, or unusual sounds; (5) Record test date, pressure, duration, and inspector name in vessel documentation. Pass criteria: no visible leaks, no deformation, no failure. New vessel: factory hydro test before supply. In-service: PSSR 2000 periodic examination (1.25 to 1.5 times MAWP) as part of written scheme. Alternative: pneumatic test (compressed air or nitrogen) at 1.1 times MAWP where hydro test is not practicable - higher risk, requires safety precautions.

    How often do pressure vessels need inspecting?

    UK inspection frequency under PSSR 2000 is determined by the Written Scheme of Examination (WSE) prepared by a Competent Person for each individual vessel or system. Typical intervals: new vessel: initial in-service examination within 12 months of first use; standard process vessel (up to 50 bar, carbon steel, non-corrosive duty): internal examination every 2 to 4 years; external examination every 6 to 12 months; hydraulic test every 5 to 10 years. Aggressive duty (corrosive, high temperature/pressure, cyclic loading): internal examination every 1 to 2 years; hydraulic test every 4 to 6 years. Safe operating limits (SOL): vessel must not be operated above the pressure, temperature, flow, and composition limits defined in the WSE. Consequences of non-compliance: PSSR 2000 is enforced by HSE; improvement notices and prohibition notices issued; prosecution for serious breaches (maximum GBP 20,000 fine in magistrates court, unlimited in Crown Court, 2 years imprisonment for individuals). EU: PED in-service inspection governed by national regulations per PED Article 14 (Directive 2014/68/EU); intervals typically comparable to UK PSSR. US: OSHA 29 CFR 1910.217 and ASME in-service inspection codes govern pressure vessel inspection frequencies.

    What materials are best for pressure vessels in water treatment?

    Material selection for water treatment pressure vessels: (1) Carbon steel (A516 Grade 70, S355 equivalent): most economic for clean service, high pressure; minimum 1.5 to 3 mm corrosion allowance for mildly corrosive water; internal coating (epoxy, fusion-bonded, or rubber lining) for aggressive water; widely used for filters, softeners, backwash tanks; (2) Stainless steel 316L (S31603, 1.4404): superior corrosion resistance for chloride-containing water (Pitting Resistance Equivalent PRE greater than 25); no corrosion allowance required; UPW applications, RO cartridge filter housings, chemical dosing; higher cost than carbon steel (approximately 3 to 5 times); (2a) Duplex stainless steel (2205, 1.4462, PRE greater than 35): seawater desalination applications; highly resistant to chloride pitting; (3) Fibreglass reinforced plastic (FRP, GRP): corrosion-resistant, lightweight; BS 4994 (design and construction); suitable for aggressive water, acids, and caustic; common for GAC/media filter vessels, chemical storage; limitations: lower pressure rating than metal for same wall thickness; temperature limit approximately 70 to 100 degrees C; (4) HDPE/PE100: low pressure applications (less than 16 bar), smaller vessels; chemical dosing day tanks; (5) Titanium Grade 2: seawater desalination membrane housings; cost-prohibitive for most applications but unmatched corrosion resistance.

    Case Study·Industrial water treatment and process engineering
    Challenge

    A pharmaceutical manufacturer in the East Midlands needed to replace 12 ageing carbon steel pressure filter vessels on its purified water (PW) and water for injection (WFI) pre-treatment system. The existing vessels had developed pitting corrosion in the weld heat-affected zones after 18 years of service, generating iron particles that were loading the downstream RO membranes and increasing cleaning frequency from quarterly to monthly.

    Approach

    The replacement specification required 316L stainless steel vessels (10 bar MAWP) with full penetration TIG welds, electropolished internal surfaces (Ra below 0.8 micron), and ASME BPE-compliant fittings. All vessels were hydrotested at 15 bar, passivated with 10% citric acid at 50 degrees C, and supplied with material test certificates (EN 10204 Type 3.1) and weld inspection records (radiography per EN 13445-5 for full weld category). WRAS approval was confirmed for all wetted materials.

    Outcome

    RO membrane cleaning frequency returned to quarterly, reducing cleaning chemical costs by GBP 38,000 per year and extending membrane life by an estimated 2 years per replacement cycle. PSSR 2000 written scheme of examination was updated by the site competent person, setting 4-year internal inspection intervals based on the service conditions and material corrosion resistance data. No particulate breakthrough events occurred in the first 24 months of operation.

    Questions to Ask Shortlisted Providers

    1. 1

      What is the Maximum Allowable Working Pressure (MAWP) and what category does the vessel fall into under the Pressure Equipment (Safety) Regulations 2016?

      PED/UKPEDD category determines conformity assessment requirements (Category I to IV); vessels in Category III and IV require Notified Body involvement; incorrect categorisation risks regulatory non-compliance and insurance void.

    2. 2

      What is the fluid service classification (water, acid, caustic, flammable) and what material corrosion resistance is required?

      Material selection (carbon steel, 316L, duplex, FRP, titanium) is driven by fluid chemistry; incorrect material selection in corrosive or chloride-rich service causes pitting and stress corrosion cracking within 5 to 10 years.

    3. 3

      What internal surface finish specification is required (as-welded, pickled and passivated, electropolished) and to what Ra roughness value?

      Pharmaceutical applications require Ra below 0.8 micron (BPE standard) to prevent biofilm formation; potable water applications require WRAS-compliant surface treatments; food grade requires 3-A sanitary standards compliance.

    4. 4

      Is a Written Scheme of Examination in place and who is the designated Competent Person for PSSR 2000 compliance?

      PSSR 2000 requires a written scheme for all pressure systems above 0.5 bar and 250 bar.litres PS.V; the scheme must define inspection intervals, safe operating limits, and examination scope; absence is an HSE enforcement priority.

    5. 5

      What documentation is required for the vessel (material test certificates, weld records, hydrostatic test certificate, UKCA/CE Declaration of Conformity)?

      BS EN 13445-5 specifies documentation requirements for unfired pressure vessels; pharmaceutical applications additionally require FDA 21 CFR Part 11-compliant batch records; incomplete documentation delays commissioning and CE/UKCA marking.

    What Drives Cost in This Category

    Vessel material and construction standard (carbon steel vs 316L vs FRP)

    Carbon steel vessels (with epoxy lining) cost 1x baseline; 316L stainless vessels cost 3 to 5 times more per unit; FRP vessels cost 1.5 to 2.5 times carbon steel but eliminate corrosion allowance and internal lining maintenance.

    Pressure rating and wall thickness

    Vessel cost scales with pressure rating; vessels above 16 bar require thicker walls, higher-grade plate material, and more intensive weld inspection (100% radiography vs spot inspection), adding 20 to 40% to fabrication cost.

    Internal surface preparation and passivation

    Electropolishing to Ra 0.8 micron adds 15 to 25% to stainless vessel cost but eliminates biofilm risk in pharmaceutical applications; passivation (citric acid or nitric acid) is mandatory post-welding and costs GBP 500 to 2,000 per vessel.

    PSSR 2000 ongoing inspection and written scheme management

    Competent person inspection costs GBP 500 to 2,500 per vessel per examination; hydraulic pressure test every 5 to 10 years costs GBP 1,000 to 5,000 per vessel including decommissioning, testing, and recommissioning.

    Key Regulations & Standards

    Pressure Equipment (Safety) Regulations 2016 (UK PEDD) and PED 2014/68/EU

    UK post-Brexit equivalent of the EU Pressure Equipment Directive; categorises pressure equipment by PS times V; Category I to IV with increasing conformity assessment; UKCA marking required for UK market; CE marking for EU market export.

    Pressure Systems Safety Regulations 2000 (PSSR 2000, SI 2000/128)

    Governs in-service use of all pressure systems above 0.5 bar and 250 bar.litres PS.V; requires written scheme of examination by a competent person, periodic inspection, safe operating limits, and maintenance records; enforcement by HSE.

    BS EN 13445:2021 Unfired Pressure Vessels (Parts 1 to 6)

    Harmonised standard for design, materials, fabrication, and inspection of unfired pressure vessels in the UK and EU; compliance enables UKCA/CE marking; Part 5 specifies inspection and testing requirements including weld classification and radiographic examination extent.

    ASME BPE-2022 Bioprocessing Equipment Standard

    Widely referenced for pharmaceutical water treatment pressure vessels (PW, WFI, CIP systems); specifies surface finish (SF1 to SF6), weld quality, documentation, and dimensional standards for hygienic process equipment; adopted by UK pharmaceutical manufacturers for GMP compliance under MHRA guidance.

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    Browse the full provider directory

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