STARK Stainless Steel Duplex Steel Water Tank for Aggressive Water Storage

The STARK duplex stainless steel water tank combines high-strength structural integrity with excellent corrosion resistance, making it ideal for demanding water storage applications across industrial, municipal, and chemical environments. Designed with both hygiene and durability in mind, it is suitable for long-term use in harsh conditions where standard 304/316 tanks may not suffice.

The STARK stainless steel duplex steel water tank is engineered for mission-critical water storage in corrosive, high-pressure, or chemically aggressive environments. Unlike conventional stainless steel grades, this tank is manufactured from duplex stainless steel—an advanced alloy composed of both austenitic and ferritic microstructures. Common duplex grades like 2205 and 2507 offer an ideal combination of strength, corrosion resistance, and durability.

Duplex Structure Advantage

Duplex stainless steel provides nearly twice the yield strength of standard 304 or 316L stainless steel. This allows for thinner walls without compromising pressure resistance or long-term structural performance. The result is a lighter tank with reduced material costs and easier installation—especially for large-capacity tanks ranging from 1 to 100 tons.

The addition of nitrogen in duplex alloys significantly improves their resistance to chloride-induced stress corrosion cracking (SCC), pitting, and crevice corrosion. This makes the tank exceptionally suited for applications involving brackish water, seawater, reclaimed water, or chemical disinfectants such as sodium hypochlorite or ozone-based treatments.

Fabrication and Internal Hygiene

Each tank is fabricated using TIG welding or orbital argon arc welding under controlled conditions. All interior surfaces are polished to Ra ≤ 0.4 µm to reduce friction, minimize scaling, and prevent biofilm formation. Optional CIP (Clean-in-Place) spray balls, manholes, and anti-vortex outlets can be integrated to support sanitary operations.

The tank can be supplied with single-wall or double-wall insulation, mirror or matte finishes, and multiple access ports for pumps, level sensors, and drain valves. Inlet and outlet configurations include threaded, flanged, or tri-clamp types. The tank is suitable for both pressurized and atmospheric applications, and can be installed vertically or horizontally.

Designed for Harsh Environments

STARK duplex stainless steel tanks are widely used in environments that exceed the limitations of standard tanks. This includes:

Seawater desalination and marine platforms
Industrial wastewater and acidic pH process fluids
Chlorinated drinking water systems
High-pressure booster storage and RO concentrate holding

Compliance and Service Life

All tanks are hydrostatically tested at 1.5x working pressure, pass NDT inspections (dye penetration and radiography optional), and comply with international hygiene standards such as ASME, ISO 9001, and CE directives. The high strength-to-weight ratio of duplex steel reduces total cost of ownership (TCO) by minimizing maintenance, downtime, and replacement frequency.

With a typical service life of 20+ years under aggressive water conditions, the STARK duplex steel tank is a premium choice for clients seeking long-term resilience and superior water quality control.

The STARK duplex stainless steel water tank is engineered for durability and optimal performance in demanding environments. Below are the key technical specifications:

Parameter	Specification
Material	Duplex Stainless Steel (e.g., SAF 2205)
Capacity Range	1,000 – 100,000 Liters (Customizable)
Working Pressure	0.05 – 0.6 MPa
Operating Temperature	-10°C to 100°C
Surface Finish	Mirror Polished (Ra ≤ 0.4 µm)
Inlet/Outlet Connections	Threaded, Flanged, or Tri-Clamp (Customizable)
Manhole	Top or Side Entry (Optional)
Insulation	Optional Polyurethane or Mineral Wool with Stainless Steel Cladding
Support Structure	Heavy-Duty Stainless Steel Legs or Skid Mounted
Standards Compliance	ISO 9001, CE, GMP, ASME (Optional)

* Custom designs are available to meet specific project requirements, including dimensions, fittings, and accessories.

STARK duplex stainless steel water tanks are designed for use in some of the most aggressive water storage environments, where standard 304 or 316 stainless steel would degrade prematurely. Thanks to their superior mechanical strength and corrosion resistance, these tanks are ideal for:

Desalination Plants: Suitable for storing pre-treated or post-treated seawater in coastal or offshore installations.
Chlorinated Potable Water Systems: Excellent resistance to chlorine-induced stress corrosion cracking makes these tanks a reliable choice for disinfected municipal water.
Industrial Wastewater Holding: Safely stores acidic or chemically loaded process water prior to treatment or discharge.
High-Pressure Booster Tanks: Withstands elevated pressures in multi-stage water distribution systems or reverse osmosis loops.
Chemical Dosing Stations: Compatible with sodium hypochlorite, ferric chloride, or other oxidizing chemical solutions.
Marine & Shipboard Water Systems: Performs under vibration, salinity, and electrolysis risks common in marine applications.

Whether installed in a desert desalination plant, an offshore drilling platform, a municipal pumping station, or a chemical processing facility, STARK duplex tanks ensure safe, long-term water storage with minimal maintenance requirements and extended lifecycle value.