Stainless steel tank and vessel fabricators for hygienic, food-grade, pharma, and industrial process service.

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    Matched providers: 44

    Top countries: United Kingdom, China

    Popular technologies: Bag Filters, Band Screens

    Stainless Steel Water Storage Tanks: Grade Selection, Fabrication, and Hygienic Standards

    Stainless steel tanks for water storage and process applications offer superior corrosion resistance, hygienic surface finish, and long service life compared to carbon steel or plastic alternatives. Common grades: Grade 304 (AISI 304, EN 1.4301, 18 percent Cr, 8 percent Ni, max 0.08 percent C): suitable for clean potable water storage, rainwater, and most process water; not recommended for chloride-rich water (greater than 200 mg/L Cl-) or coastal environments.

    Grade 316L (AISI 316L, EN 1.4404, 16 to 18 percent Cr, 10 to 14 percent Ni, 2 to 3 percent Mo, max 0.03 percent C): superior chloride resistance (Pitting Resistance Equivalent PRE = 26 to 28); suitable for seawater service, brine, saline water, chlorinated process water up to 500 to 1,000 mg/L Cl-; widely used for potable water storage, chemical dosing, pharmaceutical, and food/beverage applications. Duplex 2205 (EN 1.4462, 22 percent Cr, 5 percent Ni, 3 percent Mo, PRE greater than 35): highest chloride resistance; seawater desalination, offshore, high-salinity process water. Surface finish: BA (bright annealed), 2B (cold rolled), No. 4 (brushed), electropolished (EP, Ra less than 0.8 micron) - EP required for pharmaceutical/UPW tanks.

    Hygienic stainless steel tank design and fabrication for potable water: WRAS Approval required for all tanks in contact with potable water in the UK; materials must comply with BS 6920 (Suitability of non-metallic products for use in contact with water intended for human consumption) and the Drinking Water Inspectorate (DWI) Regulation 31 approval process. Tank fabrication: TIG (GTAW) welding with full penetration welds, weld bead polished to Ra less than 3.2 micron for exposed surfaces (Ra less than 0.8 micron for pharmaceutical); full pickling and passivation after fabrication (HNO3 30 percent solution or citric acid 10 percent, contact 30 to 60 minutes at 20 to 50 degrees C) to restore passive layer damaged by welding.

    BS EN ISO 17672 specifies filler metal selection; weld inspection per BS EN ISO 5817 (fusion welding quality levels). Hygienic design principles (EHEDG guidelines, 3-A Sanitary Standards): all interior surfaces accessible for cleaning; no dead legs greater than 2 times pipe diameter; crevice-free joints; sloped bottoms (minimum 1:100) for self-draining; vents with hygiene filters (HEPA or 0.2 micron membrane); sight glasses, level gauges per EHEDG Type EL.

    Stainless steel tank standards and sizing for water applications: BS EN 14015:2004 (Site built, vertical, cylindrical, flat-bottomed above ground welded metallic tanks for the storage of liquids at ambient temperature): for large site-built tanks (greater than 5 m diameter), covers material, welding, inspection, and testing. BS EN 13458 (Cryogenic vessels, static) and BS EN 14620 (Field erected vertical cylindrical flat-bottomed tanks for refrigerated liquefied gases at atmospheric pressure) for specialised water/wastewater storage. AWWA D100 (Welded Carbon Steel Tanks for Water Storage) and AWWA D103 (Factory-Coated Bolted Carbon Steel Tanks) - US standards commonly referenced. Thermal insulation: polyurethane foam (40 to 60 kg/m3, lambda 0.025 W/mK) applied externally with stainless steel cladding for hot or cold water storage; prevents Legionella growth in cold water (target less than 20 degrees C) and heat loss in hot water tanks (target greater than 60 degrees C). Sectional stainless steel tanks (GRP-lined or pure SS panels): installed in restricted-access plant rooms without crane access; panels bolted together on site with butyl or EPDM joint seals; suitable for 1,000 to 5,000,000 litre installations.

    Frequently Asked Questions

    What grade of stainless steel is used for water tanks?

    Grade selection for stainless steel water tanks: (1) Grade 304 (1.4301): suitable for potable cold water storage in temperate climates, rainwater, process water with chloride less than 200 mg/L; most economical stainless option; not suitable for coastal/marine environments or high-chloride water; (2) Grade 316L (1.4404): preferred for potable water where chlorides may be elevated (coastal supplies, desalinated water blends, softened water with residual NaCl); suitable for pharmaceutical, food grade, and chemical applications; higher Ni and Mo content provides pitting resistance; (3) Grade 2205 duplex (1.4462): highest corrosion resistance, for seawater, brine, very high chloride process water; higher cost, more difficult to weld; (4) Grade 321 (1.4541): titanium-stabilised 304, for high-temperature applications (greater than 400 degrees C); rarely needed for water tanks. UK WRAS approved installations: both 304 and 316L are acceptable for potable water; 316L specified by many water utilities as standard for potable storage due to greater margin against chloride pitting in recirculating hot water systems (Legionella risk at elevated Cl-). DWI Regulation 31 approval: tank manufacturer must hold WRAS/DWI approval for the specific tank range, not just the material grade.

    What capacity of stainless steel tank do I need?

    Water storage tank sizing depends on the application and demand pattern: (1) Potable water storage (buffer/break tank): minimum 1 hour peak demand at design flow rate for buildings; hospitals and critical facilities: 24 to 48 hours reserve storage; Approved Document G (Part G, Building Regulations 2010) does not prescribe tank volume but requires adequate cold water storage; BS EN 806-2 (Design for water installations) recommends 24-hour storage for cold water cisterns in commercial buildings; (2) Fire fighting: BS EN 12845 (fixed firefighting systems), BS 9990 (dry riser), or BS 9251 (sprinkler systems) specify tank volume based on hazard classification: OH3 sprinkler risk requires typically 100 to 200 m3 minimum, high hazard (HH) 300 to 1,000 m3; (3) Process water: size to buffer production rate vs supply rate, typically 30 minutes to 4 hours production demand; (4) Rainwater harvesting: calculated per BS 8515 (demand vs rainfall balance over annual cycle); (5) Cooling tower make-up: 24 to 48 hours evaporation loss storage. Physical sizing: volume = plan area times height; practical stainless tank heights 1.5 to 5 m; circular plan most efficient per unit volume; flanged cylindrical or rectangular sectional.

    How are stainless steel water tanks cleaned and disinfected?

    New tank commissioning (BS 8558:2015, Guide to the design, installation, testing and maintenance of services supplying water for domestic use): (1) Inspect interior surfaces for debris, weld spatter, or surface contamination; (2) Flush tank with clean water; (3) Fill with potable water containing minimum 50 mg/L free chlorine (as sodium hypochlorite solution); allow 1-hour contact time for new tanks or after maintenance; (4) Drain and flush with mains water until residual free chlorine is less than 0.5 mg/L (or less than 1 mg/L, depending on system); (5) Bacteriological sampling: 2 consecutive samples at least 24 hours apart, no detectable E. coli or total coliforms (BS EN ISO 9308-1); (6) Commission supply. Routine maintenance (BS 8558, Legionella COSHH ACoP L8): tank inspection annually for cold water (HSE L8 Legionella guidance); thorough inspection and cleaning every 2 to 3 years: drain, clean walls and base with food-grade detergent, inspect for corrosion, pitting, weld defects, biofilm; disinfect per BS 8558 before refilling. Stainless steel passivation maintenance: if pitting or tea staining observed, re-passivate with 10 percent citric acid solution. Hot water primary storage (calorifiers, buffer vessels): maintained at greater than 60 degrees C per L8 Legionella guidance; monthly sentinel outlet temperature checks; annual drain and inspection.

    What is the lead time for a custom stainless steel tank?

    Lead times for stainless steel tanks vary significantly by type and size: Sectional stainless steel tanks (factory-manufactured panels, site-assembled): typically 6 to 12 weeks from order to site delivery; panels are standard dimensions (600 mm x 600 mm standard, 1200 x 600, 1200 x 1200), allowing rapid production of standard configurations; bespoke configurations (non-standard dimensions, complex baffling, access arrangements) add 2 to 4 weeks. Cylindrical tank (factory fabricated, complete): 4 to 10 weeks for standard sizes up to 10,000 L; 10 to 20 weeks for large custom tanks 10,000 to 100,000 L. Site-built rectangular or cylindrical tanks (greater than 50,000 L): site fabrication typically 4 to 12 weeks on site after material lead time of 6 to 10 weeks for specialist 316L or duplex plate - overall 14 to 22 weeks from order. Expediting options: ex-stock tanks (standard sizes) available for immediate delivery from distributors; GRP-lined carbon steel sectional tanks as interim solution while SS fabricated. For WRAS/DWI-approved tanks, confirm that the specific manufacturer's tank range (not just material) holds current approval; approval renewal is annually or biennially with some certification bodies.

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    Stainless Steel Tank Companies

    Stainless steel tank and vessel fabricators for hygienic, food-grade, pharma, and industrial process service.

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    Specialists in stainless steel tank

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    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.

    Related providers

    Listed for overlapping capabilities, not for stainless steel tank specifically.

    Alfa Water srl

    Italy · 51-200 employees

    Alfa Water Srl is an Italian company with strong experience in designing and manufacturing all types of manual and automatic screen filters. We have invested our collective experience in water filtration to produce world-class solutions and products in stainless steel, super alloys and advanced materials. In addition to our deep knowledge in water filtration, Alfa Water Srl designs and manufactures a wide range of screen filters for the removal of suspended solids from water.

    Ultrafiltration (UF)Microfiltration (MF)Construction and Installation

    Changzhou Senjie Environmental Equipment Co., Ltd.

    Verified

    China · 200+ employees

    Changzhou Senjie Environmental Equipment Co., Ltd. is a Chinese manufacturer of solid-liquid separation, sludge dewatering and water treatment equipment, based in the Changzhou National Hi-Tech Industrial Development Zone, Jiangsu Province. Founded in 2014, we employ 1,280 people across two plants totalling more than 50,000 m2 and build over 1,000 machines a year. 1. FILTER PRESSES - Membrane (diaphragm) filter press, squeezing pressure up to 2.0 MPa, for the lowest achievable cake moisture - Chamber filter press (recessed plate) for industrial wastewater and mineral slurry - Plate and frame filter press for chemical, pharmaceutical, food, brewery and edible oil filtration - Fully automatic filter press with PLC control, automatic plate shifting, cake discharge and cloth washing - Mining and tailings dewatering presses for dry stacking; laboratory and pilot presses from 1 m2 Filter areas 1-1,500 m2, plate sizes 320x320 mm to 2,000x2,000 mm, filtration pressure 0.6-1.6 MPa, cake thickness 25-40 mm. Frames in carbon steel, SS304 or SS316. 2. MULTI-DISC SCREW PRESS (spiral sludge dewatering machine) Continuous, fully automatic dewatering for municipal and industrial sludge, as an alternative or complement to a filter press. All stainless steel, 17 models from KYDL-131 to KYDL-404, power 0.38-6.8 kW, capacity 5-640 kg DS/h. Low energy and wash-water consumption, low noise, compact footprint, PLC control compatible with dosing and feed systems. 3. SLURRY AND SLUDGE PUMPS - Slurry pumps (AH series) for filter press feeding and abrasive mineral slurry: flow 12.6-1,368 m3/h, head 6-64 m, power 1.5-90 kW, wear-resistant wet end - Progressing cavity (screw) pumps for high-viscosity, high-solids sludge, pulsation-free delivery - Air-operated diaphragm pumps, self-priming and chemically resistant, for slurries and corrosive liquids - Ceramic piston pumps in high-purity ceramic for the most abrasive and chemically aggressive duties 4. INDUSTRIAL WATER PURIFICATION (REVERSE OSMOSIS) SJ-RO025 / SJ-RO05 / SJ-RO1 series RO ultrapure water systems, 0.25-1.0 t/h, pump power 1.1-1.8 kW. Multi-stage pre-filtration plus RO membranes, SUS304/SUS316 wetted parts, PLC monitoring of conductivity, pressure and flow with automatic alarms. Used for laboratory, electronics, pharmaceutical and food process water, and as supporting water for filter press and dewatering lines. 5. CONSUMABLES AND SPARE PARTS Reinforced polypropylene chamber plates and membrane plates, 320x320 mm to 2,000x2,000 mm. Filter cloth in polypropylene, polyester and nylon - monofilament, multifilament, staple and needle felt - cut and finished to fit any brand of press, including food-grade cloth for juice, edible oil and syrup, and heavy-duty cloth for mining concentrate and tailings. 6. COMPLETE SYSTEMS Municipal sludge dewatering lines and turnkey industrial wastewater treatment plants: conditioning and chemical dosing, pH adjustment, coagulation and flocculation, sedimentation or DAF, biological treatment where required, sludge thickening, dewatering by filter press or screw press, cake handling and filtrate return. WHY A MANUFACTURER MATTERS Plates, cloth, presses and screw presses are produced in our own workshops rather than bought in. We quote non-standard plate sizes, supply replacement plates and cloth for other manufacturers' presses, and support a machine for its whole working life. In-house quality inspection centre and more than 30 R&D engineers. HOW WE SIZE A JOB Send us the slurry data - daily volume, dry solids content, particle size, operating temperature and pH, and your target cake moisture - and we return a sized proposal covering machine selection (filter press or screw press), filter area, plate type, cloth selection, feed pump and cycle time. WHERE OUR EQUIPMENT RUNS Municipal sewage sludge dewatering; mining, mineral concentrate and tailings dry stacking; coal slurry; stone, granite and marble cutting slurry; electroplating and surface finishing effluent; chemical and petrochemical; oil and gas; pharmaceutical; food, beverage and brewery; ceramics and kaolin; textile dyeing; pulp and paper; metallurgy and steel; power and new energy; sand and aggregate washing. Contact: Cong Lin, General Manager - lincong@czsenjie.com - +86 181 5173 1332 (WhatsApp same number) - https://czsenjehb.com

    Sludge DewateringSludge ThickeningSludge Conditioning

    Zyramic, Inc.

    Verified

    United States

    Zyramic manufactures membrane modules for membrane bioreactors, ultrafiltration and microfiltration. The company supplies modules rather than complete treatment systems, and works alongside the integrators and contractors who deliver the rest of the train. The polymer line is the Zyramic Palisade flat sheet cassette, a submerged PES flat sheet module for municipal and industrial MBR duty. A detachable scour manifold gives every plate its own dedicated scour air, continuously, so channels stay open and operators stay out of the tank. Published preliminary design basis covers 130 plate and 260 plate cassettes, roughly 136 to 273 m2 of membrane area, on a 304 stainless frame. The ceramic line covers silicon carbide and alumina elements in flat sheet and tubular form, for streams that need backwashing, aggressive cleaning chemistry, oil tolerance or very long module life. Modules are cut, welded, assembled and packed at the company's own factory in Poughkeepsie, New York. Cassettes are available for purchase or for rental where a plant needs a pilot or temporary capacity, and the factory also cuts replacement flat sheet plates for plants running cassettes from other suppliers. Field services are available.

    Membrane Bioreactors (MBR)Flat Sheet UF MembranesCeramic UF Membrane Systems

    PNR ITALIA Srl

    Verified

    Italy · 51-200 employees · 19 case studies

    We produce a comprehensive range of spraying solutions, encompassing everything from small-scale nozzles to large industrial spraying systems. Our diverse product line includes various types of nozzles tailored to meet the specific requirements of every application and customer need. The company was established in Milan in November 1968, focusing on distributing parts and components for fire protection systems. Over time, we expanded our offerings to include a diverse range of industrial sprayers tailored to various applications. In addition to our distribution and manufacturing of fire protection system components and industrial sprayers, we specialize in designing and producing pneumatic spray nozzles for industrial use and tank washing nozzles. Our product line also encompasses a variety of complementary accessories essential for industrial washing, including filters, spray guns, and hoses. Furthermore, we offer ejectors, blower nozzles, swivel joints, and hose clamps to provide comprehensive solutions for our customers' needs. PNR Italia is part of the Tecomec Group and oversees four other affiliated companies to form PNR Company, a consolidated reality with a significant presence on the market.

    Microfiltration (MF) SystemsDisinfection TechnologiesDisinfection Chemicals

    Ecosystems International

    Verified

    Indonesia · 51-200 employees

    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) SystemsUltrafiltration (UF) SystemsMulti-media Filtration (MMF) Systems
    FS

    FAM S.n.c. Water Technologies

    Italy · 51-200 employees

    FAM S.n.c. Water Technologies has been a leader in water technology for over 20 years, specializing in stainless steel solutions for water treatment, purification, and filtration systems. Serving diverse industries, the company provides advanced equipment and technology solutions across Europe.

    Reverse Osmosis (RO)Ultrafiltration (UF)Construction and Installation

    Hydroo Pump Industries,SL

    Spain · 51-200 employees

    Hydroo Pump Industries, SL is a leading manufacturer of efficient stainless steel pumps, offering a wide range of solutions including vertical multistage, high pressure, and submersible pumps. Based in Spain, Hydroo serves diverse markets across Europe, Asia-Pacific, and China, focusing on manufacturing, construction, and utility sectors.

    High-Efficiency Pumps and MotorsSmart Pumping Systems
    ZT

    Zhejiang Tankpro Industry Co., Ltd.

    China · 51-200 employees

    Zhejiang Tankpro Industry Co., Ltd. is a leading manufacturer in China, specializing in the production of steel and plastic RO pressure water storage containers. With certifications from EU RoHS and US NSF, the company is committed to delivering high-quality products backed by professional technology from Taiwan.

    Storage Tanks and Reservoirs

    Bona Water Purification

    China · 1-50 employees

    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 FiltrationConstruction and Installation

    Changde City Tianlun Precision Casting Co.,Ltd

    China · 51-200 employees

    Changde City Tianlun Precision Casting Co., Ltd, operating under the brand Sento Faucets, specializes in the manufacturing of high-end, tailor-made stainless steel faucets and water filtration dispenser taps, serving the construction and real estate industries in China and the Asia-Pacific region.

    Filtration

    SITA Srl

    Italy · 51-200 employees

    SITA Srl, based in Italy, is a leading manufacturer of UV disinfection units and stainless steel filter containers. With a focus on sustainable water treatment solutions, SITA offers innovative UV technology as an eco-friendly alternative to chlorine, serving diverse industries since 1982.

    UV Disinfection

    Eromes

    Netherlands · 51-200 employees

    Eromes specializes in the manufacturing of stainless steel products for (wastewater) treatment and process industries. Eromes supplies, among other things, screens, filters, containers, screw conveyors, and sluices.

    Band ScreensScreeningBag Filters

    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.

    Grant Plant Hire Ltd

    United Kingdom

    Grant Plant Hire Ltd (GPHL) is based near Penrith in the north of England close to the M6 and A66. GPHL has the highest of standards when it comes to the delivery of construction projects throughout Scotland and Northern England. The time-served expertise within our team gives us the ability to not only focus on the critical path but all the ancillary aspects of the job. We take pride in offering a partnered approach with our clients in order to achieve the best outcome with the minimum of delay. As well as traditional civil engineering works, GPHL specialisms include: Steel piled cofferdams In-river working Pipeline/trunk main installation Deep drainage Hydro electric schemes Tidal works Our latest projects Water mains: Currently we are engaged on Northumbrian Water’s County Durham and Tees Valley Pipeline, it is designed to improve water quality and increase resilience and operability within the Tees Network. The pipeline will replace existing portable water mains across the North East of England. GPHL are installing over 11 km of new steel welded main, completing works at the Whorley Strategic Connection including three number cast in situ underground tanks and tying in both the new inlet and twin outlet pipework to the existing reservoir. Hydro electric: GPHL have recently completed all the civil engineering works on a pioneering new type of hydro energy generation scheme at Whiteadder Reservoir, East Lothian for Scottish Water as part of its work to reduce carbon emissions. The hydro energy generation scheme is fed by a siphon and is believed to be the first of its type in Europe.  The scheme will enable Scottish Water to generate green energy while accurately controlling the level of the reservoir during seasonal fluctuations in weather. The siphon technology in the project allows Scottish Water to draw water up through the intake and over the top of the dam which then runs down through the siphon, through the hydro turbine, and back to the natural environment. Flood alleviation: GPHL are also currently subcontracted to Volker Stevin on the Flood Risk management Scheme in Appleby, for the Environment Agency. The project involves the installation of a new flood relief pumping station and installation of a new stretch of culvert diverting an existing culvert to the pumping station. A new rising main will outfall into the River Eden. The scheme is known as Appleby Town Centre Flood Risk Management Scheme (FRMS) and aims to reduce flooding caused by surcharging of the Doomgate Culvert which is designated as a main river and is a tributary of the River Eden.

    Siltbuster Group

    United Kingdom

    Established for over 20 years, the Siltbuster Limited provides rapidly deployable, “modular off the shelf” water treatment solutions to the construction, industrial and municipal markets, with a client base ranging from the world’s most recognisable multi-national corporations to small enterprises. Siltbuster provides a wide range of water and wastewater treatment equipment for the industrial and municipal markets, including: Packaged lamella dissolved air flotation (DAF) units. Lamella clarifiers. Packaged biological treatment systems. Oil/water separators. Pipe flocculators. Reaction tanks. Containerised dosing systems. In the UK, Siltbuster has pioneered the concept of offering this plant through our extensive hire fleet. Approximately 20 major contracts and circa 50 smaller projects are undertaken each year for a diverse range of clients, many of which are some of the UK’s best-known companies. In addition to the industrial/municipal sector, Siltbuster has undertaken a number of mine water treatment projects in many countries, for example, the UK, Ireland, Greece, France, USA, Canada, Australia and Slovakia. The Siltbuster team pride themselves in their ability to react rapidly and in compliance with the project constraints, delivering mobile or permanent solutions tailored to meet your individual needs.

    Water Engineering Services Ltd

    United Kingdom

    Water Engineering Services Ltd is tailored to provide a full turnkey solution to fulfil clients’ needs.   The team brings extensive knowledge of working within the wider water industry and other similar industries e.g. commercial, industrial, petrochemical and pharmaceutical. We recognise the benefits and challenges incorporating innovation into a project noting innovation can be new technology or working methodology. With our experiences working outside the Water Industry and with a wide range of Delivery Partners, WES Ltd look to bring innovation and best practices into all their projects to ensure the best project completion is achieved for all parties. WES Ltd considers Design for Manufacture and Assembly (DfMA) methodologies during the Design phase on all projects and having the Fabrication arm of the business allows for DfMA concepts to be realised, as well as providing bespoke solutions for end clients or other suppliers. Water Engineering Services consists of 3 in house areas of business: DESIGN: Our in-house design department specialises in mechanical & electrical designs but has very strong ties with Delivery Partners to also offer structural, civil, hydraulic and system integration. Our design team cover all aspects of a project from feasibility studies and optioneering to fabrication and construction drawings. ON-SITE INSTALLATION & COMMISSIONING: Our WES Ltd installation team, constructs, commissions, and optimises a project regardless of scale and complexity. This is achieved by utilising the experienced in-house mechanical & electrical team or managing a Delivery Partner or specialist contractor. Our Project Managers, Site Managers/ Supervisors, Design and CAD Engineers, Commissioning Engineers, Electrical and mechanical Site operatives all have up to date industry competency training and certification. All our electrical work will be fully tested CompEX and NICEIC certified. FABRICATION: With our 15,000 square foot workshop, offering stainless and mild steel fabrication to BSEN 1090 Execution class 2 and WRAS approval. ACCREDITATIONS WES Ltd is accredited with: ISO 9001 (Quality Management Systems) 14001 (Environmental Management Systems) 45001 (Occupational Health and Safety Management Systems) EN 1090 Ex Class 2 SafeContractor SafePQQ-PAS91 CHAS CHAS Advanced-PAS91 Achilles UVDB Silver + ISO 26000 (working towards) WES Ltd internal systems also conform to ISO 19650 (Information Management – BIM) and allow for integration into a client’s internal system e.g., ProjectWise.

    FLI Precast Solutions

    United Kingdom

    FLI Precast Solutions (formerly FLI Carlow) provide design, engineering and manufacturing services for the off-site manufacture of specialist concrete infrastructure and attenuation systems. Our markets include Water, Wastewater, Energy and Storm Attenuation in the UK & Ireland and bespoke projects globally. SERVICES INCLUDE Design, engineering and manufacturing services for the off-site manufacture of specialist concrete infrastructure and attenuation systems. Design to national and international water industry standards and our semi-precast modular designs make us the industry leader in off-site concrete engineering and manufacture. By early involvement and integrating with our clients’ design teams we can accelerate and improve design optimisation and reduce cost. The value is in the solution, and off-site manufacturing and fabrication leads to higher efficiencies and lower risks and costs. Framework agreements enable us to add more value through collaboration, innovation, economies of scale, supply chain partnering and cost management. Our products and designs are engineered to provide solutions to many challenges facing our clients: water retention, water storage, water conveyancing, water management, water treatment, fire-resistance criteria, chemical resistance parameters, infrastructural products, retaining walls, coastal erosion, decorative walls, to name a few. We are a solutions provider using innovative off-site concrete engineering and our industry leading semi-precast modular designs. The company is part of the FLI Group which is a diversified group of companies providing environmental solutions, services and technologies to private and public sector customers in the UK, France, Ireland and throughout the world. PRODUCTS INCLUDE Service reservoirs Process settlement tanks (PST / HST / FST / etc) Storm & attenuation tanks (network or site based) Process structures (ASP / TSR / GAC / RGF / etc) MCC service foundations Bund wall system Chambers Channel & lids Comms chambers Multi-purpose chambers Bespoke culverts Holding tanks Barriers Demountable fence supports (international airport approved) Ballast blocks Dry flow channelling Foundation bases Blast fence supports

    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

    George Green (Keighley) Ltd

    United Kingdom

    Founded in 1900, George Green are mechanical engineers specialising in the fabrication of steel pipework and structural steelwork. We predominantly serve the water industry, supplying all aspects of work including: CARBON/STAINLESS PIPEWORK Bends | Duckfoot Bends | Lobster Backs | Equal Tees | Reducing Tees | Con Reds | Flat Top Tapers | Manifold & Bellmouths | We can also offer competitive alternative designs to Ductile Iron Pipework. BRIDGE SCRAPERS: The rotating half bridge scraper is designed to remove settled sludge and scum from circular settlement tanks, which rotates about a central pivot and its outer end is fitted with an end carriage which carries the bridge drive and wheel assemblies. PRESSURISED STORAGE CONTAINERS: We produce a range of pressurised storage and transport containers for the safe handling of very expensive spare parts (turbine rotors and pump impellors). We have our own 10,000 sq ft facility and our service covers all mainland UK, European and worldwide markets. We have a range of accreditations: ISO 9001– 14001 – 45001. CE Marking BS EN 1090. DWI Approval for Stainless Steel Pipework.

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    Buyer's guide

    The buyer's guide to stainless steel tank

    OverviewFAQScenarioQuestions to askCost driversRegulations

    Stainless Steel Water Storage Tanks: Grade Selection, Fabrication, and Hygienic Standards

    Stainless steel tanks for water storage and process applications offer superior corrosion resistance, hygienic surface finish, and long service life compared to carbon steel or plastic alternatives. Common grades: Grade 304 (AISI 304, EN 1.4301, 18 percent Cr, 8 percent Ni, max 0.08 percent C): suitable for clean potable water storage, rainwater, and most process water; not recommended for chloride-rich water (greater than 200 mg/L Cl-) or coastal environments.

    Grade 316L (AISI 316L, EN 1.4404, 16 to 18 percent Cr, 10 to 14 percent Ni, 2 to 3 percent Mo, max 0.03 percent C): superior chloride resistance (Pitting Resistance Equivalent PRE = 26 to 28); suitable for seawater service, brine, saline water, chlorinated process water up to 500 to 1,000 mg/L Cl-; widely used for potable water storage, chemical dosing, pharmaceutical, and food/beverage applications. Duplex 2205 (EN 1.4462, 22 percent Cr, 5 percent Ni, 3 percent Mo, PRE greater than 35): highest chloride resistance; seawater desalination, offshore, high-salinity process water. Surface finish: BA (bright annealed), 2B (cold rolled), No. 4 (brushed), electropolished (EP, Ra less than 0.8 micron) - EP required for pharmaceutical/UPW tanks.

    Hygienic stainless steel tank design and fabrication for potable water: WRAS Approval required for all tanks in contact with potable water in the UK; materials must comply with BS 6920 (Suitability of non-metallic products for use in contact with water intended for human consumption) and the Drinking Water Inspectorate (DWI) Regulation 31 approval process. Tank fabrication: TIG (GTAW) welding with full penetration welds, weld bead polished to Ra less than 3.2 micron for exposed surfaces (Ra less than 0.8 micron for pharmaceutical); full pickling and passivation after fabrication (HNO3 30 percent solution or citric acid 10 percent, contact 30 to 60 minutes at 20 to 50 degrees C) to restore passive layer damaged by welding.

    BS EN ISO 17672 specifies filler metal selection; weld inspection per BS EN ISO 5817 (fusion welding quality levels). Hygienic design principles (EHEDG guidelines, 3-A Sanitary Standards): all interior surfaces accessible for cleaning; no dead legs greater than 2 times pipe diameter; crevice-free joints; sloped bottoms (minimum 1:100) for self-draining; vents with hygiene filters (HEPA or 0.2 micron membrane); sight glasses, level gauges per EHEDG Type EL.

    Stainless steel tank standards and sizing for water applications: BS EN 14015:2004 (Site built, vertical, cylindrical, flat-bottomed above ground welded metallic tanks for the storage of liquids at ambient temperature): for large site-built tanks (greater than 5 m diameter), covers material, welding, inspection, and testing. BS EN 13458 (Cryogenic vessels, static) and BS EN 14620 (Field erected vertical cylindrical flat-bottomed tanks for refrigerated liquefied gases at atmospheric pressure) for specialised water/wastewater storage. AWWA D100 (Welded Carbon Steel Tanks for Water Storage) and AWWA D103 (Factory-Coated Bolted Carbon Steel Tanks) - US standards commonly referenced. Thermal insulation: polyurethane foam (40 to 60 kg/m3, lambda 0.025 W/mK) applied externally with stainless steel cladding for hot or cold water storage; prevents Legionella growth in cold water (target less than 20 degrees C) and heat loss in hot water tanks (target greater than 60 degrees C). Sectional stainless steel tanks (GRP-lined or pure SS panels): installed in restricted-access plant rooms without crane access; panels bolted together on site with butyl or EPDM joint seals; suitable for 1,000 to 5,000,000 litre installations.

    Post your stainless steel tank project

    Frequently asked questions

    What grade of stainless steel is used for water tanks?

    Grade selection for stainless steel water tanks: (1) Grade 304 (1.4301): suitable for potable cold water storage in temperate climates, rainwater, process water with chloride less than 200 mg/L; most economical stainless option; not suitable for coastal/marine environments or high-chloride water; (2) Grade 316L (1.4404): preferred for potable water where chlorides may be elevated (coastal supplies, desalinated water blends, softened water with residual NaCl); suitable for pharmaceutical, food grade, and chemical applications; higher Ni and Mo content provides pitting resistance; (3) Grade 2205 duplex (1.4462): highest corrosion resistance, for seawater, brine, very high chloride process water; higher cost, more difficult to weld; (4) Grade 321 (1.4541): titanium-stabilised 304, for high-temperature applications (greater than 400 degrees C); rarely needed for water tanks. UK WRAS approved installations: both 304 and 316L are acceptable for potable water; 316L specified by many water utilities as standard for potable storage due to greater margin against chloride pitting in recirculating hot water systems (Legionella risk at elevated Cl-). DWI Regulation 31 approval: tank manufacturer must hold WRAS/DWI approval for the specific tank range, not just the material grade.

    What capacity of stainless steel tank do I need?

    Water storage tank sizing depends on the application and demand pattern: (1) Potable water storage (buffer/break tank): minimum 1 hour peak demand at design flow rate for buildings; hospitals and critical facilities: 24 to 48 hours reserve storage; Approved Document G (Part G, Building Regulations 2010) does not prescribe tank volume but requires adequate cold water storage; BS EN 806-2 (Design for water installations) recommends 24-hour storage for cold water cisterns in commercial buildings; (2) Fire fighting: BS EN 12845 (fixed firefighting systems), BS 9990 (dry riser), or BS 9251 (sprinkler systems) specify tank volume based on hazard classification: OH3 sprinkler risk requires typically 100 to 200 m3 minimum, high hazard (HH) 300 to 1,000 m3; (3) Process water: size to buffer production rate vs supply rate, typically 30 minutes to 4 hours production demand; (4) Rainwater harvesting: calculated per BS 8515 (demand vs rainfall balance over annual cycle); (5) Cooling tower make-up: 24 to 48 hours evaporation loss storage. Physical sizing: volume = plan area times height; practical stainless tank heights 1.5 to 5 m; circular plan most efficient per unit volume; flanged cylindrical or rectangular sectional.

    How are stainless steel water tanks cleaned and disinfected?

    New tank commissioning (BS 8558:2015, Guide to the design, installation, testing and maintenance of services supplying water for domestic use): (1) Inspect interior surfaces for debris, weld spatter, or surface contamination; (2) Flush tank with clean water; (3) Fill with potable water containing minimum 50 mg/L free chlorine (as sodium hypochlorite solution); allow 1-hour contact time for new tanks or after maintenance; (4) Drain and flush with mains water until residual free chlorine is less than 0.5 mg/L (or less than 1 mg/L, depending on system); (5) Bacteriological sampling: 2 consecutive samples at least 24 hours apart, no detectable E. coli or total coliforms (BS EN ISO 9308-1); (6) Commission supply. Routine maintenance (BS 8558, Legionella COSHH ACoP L8): tank inspection annually for cold water (HSE L8 Legionella guidance); thorough inspection and cleaning every 2 to 3 years: drain, clean walls and base with food-grade detergent, inspect for corrosion, pitting, weld defects, biofilm; disinfect per BS 8558 before refilling. Stainless steel passivation maintenance: if pitting or tea staining observed, re-passivate with 10 percent citric acid solution. Hot water primary storage (calorifiers, buffer vessels): maintained at greater than 60 degrees C per L8 Legionella guidance; monthly sentinel outlet temperature checks; annual drain and inspection.

    What is the lead time for a custom stainless steel tank?

    Lead times for stainless steel tanks vary significantly by type and size: Sectional stainless steel tanks (factory-manufactured panels, site-assembled): typically 6 to 12 weeks from order to site delivery; panels are standard dimensions (600 mm x 600 mm standard, 1200 x 600, 1200 x 1200), allowing rapid production of standard configurations; bespoke configurations (non-standard dimensions, complex baffling, access arrangements) add 2 to 4 weeks. Cylindrical tank (factory fabricated, complete): 4 to 10 weeks for standard sizes up to 10,000 L; 10 to 20 weeks for large custom tanks 10,000 to 100,000 L. Site-built rectangular or cylindrical tanks (greater than 50,000 L): site fabrication typically 4 to 12 weeks on site after material lead time of 6 to 10 weeks for specialist 316L or duplex plate - overall 14 to 22 weeks from order. Expediting options: ex-stock tanks (standard sizes) available for immediate delivery from distributors; GRP-lined carbon steel sectional tanks as interim solution while SS fabricated. For WRAS/DWI-approved tanks, confirm that the specific manufacturer's tank range (not just material) holds current approval; approval renewal is annually or biennially with some certification bodies.

    Illustrative scenario · Potable water storage and distribution infrastructure

    A composite drawn from typical projects in this category, not a single client engagement. Figures are indicative.

    Challenge
    A regional water company in the East of England needed to replace 14 ageing bolted steel cold water storage tanks at a strategic pumping station, most dating from 1974. Corroded panels were creating iron particle contamination in downstream supply zones, triggering customer discolouration complaints. One tank had developed a pinhole leak in a weld seam causing a GBP 28,000 emergency repair callout.
    Approach
    The engineer specified sectional Grade 316L stainless steel tanks (a WRAS-approved sectional range) in a 2+1 configuration (two duty tanks plus one standby), each 120,000 L, replacing the four ageing bolted steel tanks of combined 400,000 L capacity. Tanks were designed with sloped bases (1:100 to drain), hinged inspection covers, HEPA vent filters, and floating off-take assemblies. Disinfection followed BS 8558 commissioning protocol (50 mg/L free chlorine, 1-hour contact time, two clean bacteriological samples before service entry).
    Outcome
    Iron particle discolouration complaints fell to zero in the three downstream DMA zones within 6 weeks of the new tanks entering service. The PSSR 2000 written scheme of examination was updated to reflect 316L stainless material (5-year internal inspection interval versus 2-year interval for the previous carbon steel tanks). The 60-year design life of the stainless tanks was confirmed by the competent person, reducing whole-life asset management cost by GBP 1.2 million versus continued maintenance of the original bolted steel tanks.

    Questions to ask shortlisted providers

    5
    1. 01

      What is the water quality in terms of chloride concentration, pH, dissolved oxygen, and residual chlorine, and what stainless grade (304 vs 316L) is appropriate?

      Chloride above 200 mg/L increases pitting risk on Grade 304; potable water supplies blended with softened water or desalinated water may have elevated chloride requiring 316L or duplex; incorrect grade selection causes pitting failure within 10 to 20 years.

    2. 02

      What is the required tank capacity and configuration (single, duty/standby, compartmented) for the supply zone security of supply commitment?

      Water company operational security typically requires 24 to 48 hours storage reserve; tank sizing must account for demand peaks, firefighting reserve, and maintenance isolation without supply interruption.

    3. 03

      Does the installation require a WRAS-approved product and does the specific manufacturer's tank range hold current WRAS certification?

      WRAS approval is required for all potable water contact materials under WS(WQ)R 2016; approval is range-specific, not just material-specific; an unapproved tank from an approved-material manufacturer still requires DWI consent.

    4. 04

      What is the expected maintenance access regime and what inspection intervals will the PSSR 2000 competent person specify?

      316L stainless tanks typically achieve 5-year internal inspection intervals (versus 2 years for carbon steel); this needs to be agreed with the competent person before procurement to confirm the compliance cost assumption in whole-life modelling.

    5. 05

      Is there a Legionella risk assessment for the tank and its associated hot or cold water systems, and what temperature control is specified?

      Cold water storage tanks must maintain water below 20 degrees C per ACOP L8; tanks in warm plant rooms or exposed to solar gain may require insulation or recirculation to prevent temperature rise and Legionella risk.

    What drives cost in this category

    4
    Tank volume, material grade, and panel configuration
    Sectional 316L stainless tanks cost GBP 600 to 1,200 per m3 of capacity for mid-range volumes (50,000 to 500,000 L); 304 stainless is 15 to 25% cheaper but unsuitable for elevated-chloride supply zones.
    Site preparation, access, and installation complexity
    Below-deck tank replacement in existing buildings adds 30 to 60% to installation cost due to confined access; crane-lifted cylindrical tanks on open sites are 20 to 40% cheaper to install than sectional tanks assembled in confined spaces.
    WRAS approval and commissioning requirements
    Commissioning per BS 8558 (disinfection, bacteriological sampling, regulatory notification to DWI) costs GBP 2,000 to 8,000 per installation; DWI notification of tank replacement is required under WS(WQ)R 2016 Regulation 28.
    Ongoing PSSR 2000 inspection and maintenance costs
    Competent person inspection for tanks under PSSR 2000 costs GBP 500 to 2,500 per vessel per examination; 316L stainless tanks typically require inspection every 5 years vs 2 years for carbon steel, reducing 25-year inspection cost by GBP 4,000 to 12,000 per tank.

    Key regulations and standards

    4
    Water Supply (Water Quality) Regulations 2016 and DWI Regulation 28
    All materials in contact with potable water must be WRAS-approved or individually tested per BS 6920; tank replacement at strategic storage sites requires notification to DWI under Regulation 28; DWI may specify additional sampling requirements post-commissioning.
    BS 8558:2015 Guide to Design, Installation, Testing and Maintenance of Services Supplying Water for Domestic Use
    Specifies commissioning, disinfection, bacteriological testing, and maintenance requirements for cold water storage installations; commissioning must achieve two consecutive clean bacteriological samples before the tank enters supply.
    PSSR 2000 and Written Scheme of Examination for Pressure Vessels
    Cold water storage tanks operating above atmospheric pressure (e.g. with pressurised inlets) may fall under PSSR 2000; the written scheme must define inspection intervals, safe fill levels, and examination scope; maintained by the site competent person.
    HSE ACOP L8 Legionella Control and Cold Water Storage Tanks
    Cold water stored in tanks must be maintained below 20 degrees C and above 2 degrees C to prevent Legionella growth; tank insulation, shading, and regular inspection and cleaning are required; risk assessment must document control measures and monitoring records.

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