Nagaoka International

What Nagaoka International does

Nagaoka International Corporation (株式会社ナガオカ) is a Japanese specialty engineering firm that operates two business segments built on a common proprietary wound-wire screen technology platform. The Energy segment manufactures screen internals, basket-style components used inside catalytic reactors at petroleum refineries, petrochemical plants, and fertilizer facilities. The Water segment produces water intake screens (deep well, shallow well, ring base, radial, buried canal) and a portfolio of chemical-free water treatment systems, principally the Chemiles biological treatment system and the AirSys packed-tower aeration system, as well as the HiSIS seabed infiltration intake for seawater desalination. Nagaoka is the only qualified screen internals supplier in Japan and one of a small number globally certified by major refinery process owners including Honeywell UOP, Axens, Shell, Chevron, Haldor Topsoe, KBR, and Lummus Technology, giving the Energy segment a tightly gated customer base.

The company runs a project-based direct sales model with no agents or regional distributors, selling engineering-led solutions globally through proposals that span design, manufacturing, delivery, and startup support. Pricing is bespoke and contract values range from hundreds of millions of yen per project to approximately ¥900 million for large single orders, with some multi-stakeholder water treatment plant projects reaching ¥1.437 billion (Tsuda Water Purification Plant JV with Organo). Energy customers are global refiners, petrochemical operators, and EPC contractors. Water customers span municipal water utilities, industrial water users, and agricultural operations, with Japan domestic waterworks representing the largest installed base (more than 1,000 deep-well projects since 1980) and approximately 99% domestic share in shallow well intake technology. International water business is accessed largely through JICA SME overseas expansion programs and direct engagement with utilities in Vietnam, Thailand, China, and other Southeast Asian and African markets.

Manufacturing is concentrated at the Himeji (Hyogo Prefecture) factory, with the Kaizuka (Osaka) Development Center housing R&D. Wholly-owned subsidiaries in Dalian, China (since 2018) and Hung Yen Province, Vietnam (since 2020), plus the July 2022-acquired domestic EPC subsidiary Yazawa Ferromite, extend operating reach. Registered capital stands at ¥1,253,241,000 with 93 employees on a standalone basis and 223 consolidated, and dual headquarters in Osaka and Tokyo since June 2024. The technology portfolio has accumulated three consecutive IWA Project Innovation Awards (2010, 2012, 2014), the first such streak by any company, plus the 2026 EcoVadis Commitment Badge and January 2026 UN Global Compact signatory status to support ESG-sensitive international tenders.

Name

Nagaoka International

Legal name

株式会社ナガオカ (NAGAOKA INTERNATIONAL CORPORATION)

Website

https://nagaokajapan.co.jp

Company type

Public

Founded year

1934

Operating status

Operating

Headcount range

101–250 employees

Short description

Nagaoka International Corporation is a Japanese specialty engineering firm providing certified reactor internals to global petroleum refineries and petrochemical plants, plus water intake screens and chemical-free treatment systems for municipal, industrial, and agricultural users.

Ownership category

akta.pro rank

Product category

Industrial Water Treatment and Reactor Internal Equipment Manufacturing

NAICS

Other General Purpose Machinery Manufacturing (3339), Sewage Treatment Facilities (22132)

SIC

Special Industry Machinery (No Metalworking Machinery) (3550), Oil & Gas Field Machinery & Equipment (3533), Water Supply (4941)

akta.pro primary industry

Separation & Filtration Equipment (Filters, Centrifuges, Membranes) (IMAHAEAB)

akta.pro secondary industries

Water & Wastewater Treatment Plant Equipment (Clarifiers, Aeration, Membrane Systems) (IMAHAEAJ), Refinery Offsites, Storage & Loading (Tankage, Truck/Rail/Marine Loading) (EUALAGAK), Industrial Water Reuse Utilities (ZLD/MLD & Process Water Recycling) (EUANAGAG)

Keywords

• Water intake screens
• Reactor internals manufacturing
• Groundwater treatment equipment
• Screen filtration systems
• Wound-wire screen technology

Headquarters

HQ city

Osaka

HQ country

Japan

HQ region

Asia

Offices7 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Supply Chain, Operations, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Energy Business — Screen Internals Manufacturing and Sales: Manufactures and sells screen internals (reactor internals) for petroleum refining, petrochemical, and fertilizer plants. Products are sold directly to end-users, EPC contractors, and process owners globally. Revenue is project-based with significant contract values (hundreds of millions to ~900 million yen per project). The company is a qualified supplier certified by process owners such as Honeywell UOP, Axens, Shell, Chevron, and others.
2. Water Business — Water Intake Screens Manufacturing and Sales: Manufactures and sells water intake screens (ring base screens, radial screens, well screens, buried collector screens, and surface water intake screens) for municipal waterworks, industrial water, agricultural water, and seawater desalination applications. Sold directly to water utilities and engineering companies. Includes project-based pricing with engineering, design, and installation services.
3. Water Treatment Equipment — Chemiles, AirSys, and Water Treatment Plants: Sells water treatment equipment including the chemical-free Chemiles system and the AirSys packed-tower aeration system. Products are sold to municipal water utilities, industrial facilities, agricultural operations, and private companies. Revenue includes equipment sales, installation, and commissioning services. The company also designs, manufactures, and installs complete water treatment plants through its group companies.

Go-to-market motion1 record

Distribution channels4 records

Marketing channels5 records

Core offering

Nagaoka International Corporation manufactures and sells two main product lines derived from its proprietary wound-wire Nagaoka Screen technology. The Energy business produces Screen Internals—reactor internal components (basket-style internals, profile wire scallops, distributors) used inside catalytic reactors for petroleum refining, petrochemical, and fertilizer plants, sold to process owners and EPCs globally. The Water business produces groundwater intake screens (ring base, radial, buried canal, surface water) for municipal water utilities, agriculture, and seawater desalination, along with chemical-free water treatment systems (Chemiles biological treatment, AirSys aeration, HiSIS seabed infiltration) sold to municipal waterworks, factories, and agricultural operations in Japan and internationally.

Product overview

Nagaoka International operates as a dual-business company offering specialized equipment for the energy sector (screen internals for petroleum refining and petrochemical plants) and water sector (intake screens and treatment systems). The core technology platform is the Nagaoka Screen, which has expanded into two main divisions. The energy division provides Screen Internals as critical reactor internal components for oil refining and petrochemical processes. The water division encompasses the Nagaoka Screen family including ring base screens, collectors, and radial screens for groundwater intake, complemented by water treatment products including Chemiles (chemical-free biological treatment), AirSys (aeration treatment), HiSIS (seabed infiltration for desalination), and water treatment equipment. The company offers integrated solutions from intake to treatment, with a focus on chemical-free, environmentally friendly technologies.

Differentiator

Problem solved

Functional benefit

Brands

• ケミレス (Chemiles): Chemical-free water treatment device that purifies groundwater using air and microorganisms without chemicals.
• エアシス (AirSys)
• ナガオカ・スクリーン (Nagaoka Screen)
• ハイシス (HiSIS)
• ケミレスPlus As

Products and services

• Screen Internals (スクリーン・インターナショナル) Reactor internal components (basket-style internals, profile wire scallops, distributors, ring-base internals) installed inside catalytic reactors for petroleum refining, petrochemical, and fertilizer plants. Manufactured under process-owner certifications (Honeywell UOP, Axens, Shell, Chevron, Haldor Topsoe, KBR, Lummus Technology). Designed to support catalysts and enable smooth flow in high-temperature, high-pressure continuous catalytic regeneration (CCR) and other radial flow reactor applications.
• Nagaoka Screen Water Intake Systems (ナガオカ・スクリーン) Comprehensive family of wound-wire water intake screens for extracting groundwater from deep wells, shallow wells, buried collection canals, and surface water sources. Built on proprietary continuous-vertical-slot technology and sand control technology to deliver intake efficiency approximately 10x greater than slotted pipes or strainers.
• Chemiles (ケミレス) Chemical-free Biological Water Treatment System Ultra-high-speed biological water treatment system that removes iron, manganese, and ammonia nitrogen from groundwater using air and microorganisms without chemicals. Achieves treatment speeds of 400 m/day through contact oxidation and biological processes, eliminating trihalomethane by-products and reducing operating costs dramatically. Won IWA-PIA Excellence Award in 2010.
• AirSys (エアシス) Packed Tower Aeration System Energy-saving packed tower aeration treatment system that removes VOCs (volatile organic compounds such as trichloroethylene) and free carbonic acid from groundwater and river water. Achieves over 99% removal of contaminants, reduces energy consumption by 60%, and can treat low-concentration VOCs to 0.001 mg/L (1/10 of drinking water standards).
• HiSIS (ハイシス) High-Speed Seabed Infiltration Intake System Revolutionary seawater intake system that percolates seawater through seabed sand layers before intake, producing clean water without marine organism fouling and eliminating the need for chemical anti-fouling agents. The unit-based design allows flexible installation configurations for desalination plants.
• Ring Base Screen (リングベース・スクリーン) Double-layer wound-wire screen combining ring reinforcement with V-slot openings. Achieves high open area (up to 50%+ for collectors, 52%+ for radial screens) without sacrificing structural strength. The double-layer construction resists external pressure while maintaining high intake efficiency and enabling easy cleaning and backwashing.
• Water Treatment Equipment (水処理設備) - Comprehensive Plant Solutions Comprehensive water treatment plant equipment including design, manufacturing, and installation for water purification and sewage facilities, provided by subsidiary Yazawa Ferromite Co., Ltd. Includes biological treatment systems (Chemiles technology) and rapid filtration for full plant solutions.
• Chemiles Plus As (ケミレスPlus As) Arsenic Removal Technology Arsenic removal technology leveraging Chemiles' iron oxide adsorption mechanism for efficient arsenic removal from groundwater, expanding the Chemiles platform to address arsenic contamination.

Quantifiable outcome

• Intake efficiency 10x higher than conventional strainer/slotted pipes
• +6 more outcomes

Named customers9 records

Segments5 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature8 records

Partnerships

Twelve partnerships are on record, tiered core and major.

• Pacific Consultants Co., Ltd.coreStrategic or Co-development Partner · 25 August 2025Joint development of a new surface water intake screen technology for rivers and dams. The partnership combines Nagaoka's screen technology with Pacific Consultants' engineering expertise to address the surface water intake market. A joint patent application was filed as part of this collaboration.
• Son Ha International CorporationmajorStrategic or Co-development Partner · 26 September 2018Memorandum of understanding for water treatment business cooperation in Vietnam. Son Ha is Vietnam's largest stainless steel water tank and piping company (Ho Chi Minh Stock Exchange listed, SHI), with ~2,500 employees, 9 factories, 80 branches, 120 agents, and 20,000 retailers. Son Ha has acquired municipal water utilities and is expanding into water treatment plant construction and operation. The MOU enables Nagaoka to sell Chemiles and other water treatment products through Son Ha's extensive distribution network in Vietnam.
• Land Concierge Co., Ltd. (株式会社ランドコンシェルジュ)majorChannel Partner/ Reseller/ Distributor · 15 May 2017Exclusive domestic sales agreement in Japan for Airsys PLUS, a VOC (benzene and other volatile organic compounds) treatment system for groundwater and soil remediation. Land Concierge specializes in environmental investigation equipment and purification materials, making them an ideal channel partner for soil/groundwater contamination treatment applications in Japan's environmental remediation market.
• PWA (Provincial Waterworks Authority, Thailand)coreStrategic or Co-development Partner · 5 April 2017Memorandum for Chemiles demonstration test at a PWA-operated water treatment plant in Thailand, in conjunction with JICA's project formation survey program. PWA serves provincial water supply in Thailand and is exploring Chemiles technology for treating groundwater with iron, manganese, and arsenic in areas without centralized water supply (~8.25 million people without access). Mitsui & Co. Plant Systems ( Mitsui Plant Systems Corp.) is also a party to the agreement.
• Mitsui & Co. Plant Systems Corporation (三井物産プラン卜システム株式会社)coreStrategic or Co-development Partner · 5 April 2017Partner in the JICA project formation survey for Chemiles in Thailand, working with PWA. The company facilitates the project's implementation alongside Nagaoka and PWA.
• JICA (Japan International Cooperation Agency)coreGTM or Marketing Partner · 4 February 2016Nagaoka participates in multiple JICA SME overseas expansion programs. The company was selected for JICA's 'Promotion and Demonstration Projects' for Chemiles in Vietnam (Hanoi Tuong Mai Water Treatment Plant, 2,500 m³/day) and for Thailand (PWA pilot test). JICA provides funding and institutional support, enabling Nagaoka to enter developing country markets through ODA frameworks. The company also hosts JICA trainees at its facilities as part of Japan's water sector technical cooperation programs.
• Sawaco (Ho Chi Minh City Water Supply Company, Vietnam)majorStrategic or Co-development Partner · 1 December 2015Demonstration experiment at Tan Phu Water Treatment Plant (December 2015–November 2016) using Chemiles to solve treatment challenges with existing processes. The demonstration was successful, leading to further engagement including a visit by the Ho Chi Minh City Japan delegation to the Tsuda Water Purification Plant in Japan (April 2017). Sawaco is Ho Chi Minh City's main water utility.
• VIWASE (Vietnam Water, Sanitation and Environment Joint Stock Company)majorStrategic or Co-development Partner · 24 July 2015Memorandum of Understanding for cooperation in water intake and water treatment projects in Vietnam. VIWASE is Vietnam's largest water consulting firm, founded in 1969, with 350 employees providing design, planning, and survey services. VIWASE handles projects for JICA, World Bank, and Asian Development Bank. The MOU targets applying Nagaoka's shallow well and Chemiles technologies to Vietnam's groundwater treatment needs.
• MetaWater Co., Ltd.majorStrategic or Co-development Partner · 31 March 2014Mutual sales and purchase agreement for water treatment equipment. MetaWater specializes in ceramic membrane filtration systems, ozonizers, and sludge incinerators for water and wastewater treatment plants. The partnership enables cross-selling of each company's water treatment technologies and products, expanding both companies' addressable markets in Japan and internationally.
• BEWG (North Control Water Group / 北京控股集团有限公司)majorStrategic or Co-development Partner · 18 March 2014Agreement for HiSIS (High-Speed Seabed Infiltration Intake System) pilot plant at Caofeidian Industrial Development Zone in Hebei, China. BEWG is Hong Kong Stock Exchange listed (HK00371) and has grown from under 1 million tons/day to 20 million tons/day water treatment capacity in just 5 years. The partnership targets demonstration of HiSIS technology delivering water to a planned 1 million m³/day desalination plant for Beijing, using BEWG's membrane treatment as the downstream process.
• Honeywell UOP (formerly UOP LLC)coreTechnology or Integration · 1 January 1990Technical joint development agreement for reactor internals manufacturing technology (1990), followed by joint development of profile wire scallop technology (1999). Nagaoka is a certified supplier of internals for UOP's Oleflex, CCR, and other process technologies. This is one of Nagaoka's most important process owner relationships, providing global access to UOP-licensed refineries and petrochemical plants.
• Axens (formerly IFP/Accens)coreTechnology or Integration · 1 January 1976Certified supplier relationship for reactor internals used in Axens-licensed processes. Certified since 1976, making Axens one of Nagaoka's oldest process owner partnerships.

Scale indicators8 records

Recent moves8 records

Expansion highlights6 records

Market position

Competitive moat4 records

Key highlights7 records

Customer concentration

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Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles6 records

Subsidiaries4 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Nagaoka International