Main benefits
  • High corrosion resistance due to compact and unique design
  • Wide range of highly corrosion-resistant materials guarantees high durability of the pump
  • Reliable design ensures longer maintenance-free operation
  • Easy assembly and maintenance of the pump
  • Low plant down time due to high reliability
Main applications

The VAS acid pump range has been designed to meet the requirements in H2SO4 plants such as

  • Absorption tower
  • Drying tower
  • Heat recovery system
Cutted vertical acid pump
Vertical acid pump type Ensival Moret VAS

Main design features
  • Symmetrical diffuser casing design minimizes radial loads and shaft deflection ensuring longer pump service life
  • Auxiliary packing rings to prevent acid vapors and minimize corrosion
  • Non-contacting shaft sealing with throttle bushing which reduces head pressure and minimizes leakage overflow
  • Easy assembly and installation of the pump to the tank due to symmetric design with circumferential mounting plate
  • Fully protected bolts against corrosion allow easy assembling and dismantling of the pump
  • High efficiency and low net positive suction head (NPSH) due to closed impeller
Key characteristics
Capacities Capacity up to 4,000 m3/h / 17,500 USgpm
Heads Heads up to 45 m / 148 ft
Pressures Pressure up to 20 bar / 290 psi

Temperature up to 150°C / 291°F

Temperature up to 250°C / 480°F (heat recovery)

Maximum speed of rotation Speed of rotation up to 1,800 rpm
Case Studies
  • Vertical sulfuric acid pump allows for long lifetime and reduced maintenance
    The VAS vertical tubine pump design extends the lifetime of the equipment in demanding chemical process industry applications and allows the customer to increase the mean time between maintenance remarkably.

  • Vertical turbine pump design improves operating performance in sulfuric acid production plant
    Pumping of sulfuric acid is a very demanding application, and the lifetime of the equipment is a challenge considering the severe corrosive conditions encountered in several parts of the process. The selection of the pump design is a fundamental step in obtaining the best operating performance of the equipment. Read the whole article.

  • Pumping equipment in phosphate fertilizer processes
    Pumps are at the heart of phosphate fertilizer production, and correct equipment selection that takes into consideration hydraulic design, materials of construction, application knowledge, duty point and maintenance regime are critical to achieving reliable long-term pumping operation and maximum plant production. Read the whole article.

  • Case studies
    Wherever fluids are pumped, mixed, controlled or applied, we are there. See how our solutions create value for customers and learn how we can make your pumping and mixing processes more efficient and profitable, safeguarding your production and ensuring lasting reliability.
Careful commissioning of the pump plays a key role in the safe and reliable use of the pump
Connecting the pipes to the pump correctly is essential for ensuring the reliability of the pump
Related links

Products and services

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    Sulzer SALOMIX™ and Scaba mixing and agitation technology offers a wide range of products for industrial applications. Side-mounted horizontal and top-mounted vertical agitators, dynamic chemical mixers, and tower and tank flow management products guarantee effective mixing and agitating processes.

  • Original pump spare parts
    Original spare parts machined to the correct tolerances and clearances give a perfect fit first time, every time. Our commitment to continuous improvement often allows us to supply parts with improved features, thus enhancing performance, extending equipment life, while reducing maintenance costs.

  • Service kits
    When your equipment needs to be repaired you shouldn’t have to worry about spending valuable time searching for the right parts – or even worse, finding out that some small but vital parts are missing. With Sulzer service kits you get everything you need in one package.

  • Sulzer mechanical seals
    Sulzer mechanical seals are strong by design and have been proven very reliable in various pumping applications.


  • Chemical processing
    Our solutions for the chemical processing industry include pumping, separation and mixing, as well as services for rotating equipment and infrastructure. We offer experience in classical chemical, plastic, and pharmaceutical production as well as in processing renewable materials.

  • Biochemicals
    Biorefineries can rely on us to develop advanced pumping, mixing, and separation solutions for the production of biochemicals, from pilot to commercial-scale installations. We have broad experience in the processing of renewable raw materials and chemical processes.

  • Chemicals
    Sulzer improves quality, capacity, and energy efficiency with its advanced technologies and services for separation processes; including distillation, absorption, evaporation, extraction and crystallization. Our pumps, mixers, and agitators cover the specific requirements in chemical processes.

  • Fertilizers
    Our pumps, mixers and agitators provide durability and reliability for fertilizers production as well as for corrosive and abrasive liquids and high gas content. Our specific industry experience also includes separation processes and servicing of pumps, compressors, turbines, and motors.

  • Food and beverage
    Food and beverage production relies on our pumping and mixing solutions. Special pumps and agitators have been developed for sugar, starch, and sweetener production. Separation equipment is often used in beverage manufacturing and our process technologies support purification and concentration.

  • Mining and metals
    Long experience and detailed knowledge of metals and mining applications with different raw materials makes Sulzer a reliable pump supplier for these industries.

  • Biofuels
    Biofuels from renewable sources show great potential as sustainable transportation fuel. Based on our experience in demanding processes, we work with customers to develop advanced pumping, mixing, and distillation solutions for the production of biofuels, from pilot to commercial-scale installations.

  • Pulp, paper and board
    Sulzer is the world leader in innovative, reliable, and proven pumping, agitation and mixing solutions for the pulp and paper industry. Our deep process and application knowledge is based on long-term close co-operation with the producers, machinery suppliers and engineering companies.

  • Power generation
    You can rely on our high-performance pumps for efficient operations of fossil-fired, nuclear, and renewable power generation. Our maintenance and repair services for turbines, pumps, and generators ensure continuous operations.

  • Oil gas and chemicals
    High-performance pumps from Sulzer provide cutting edge solutions for the production, processing and transportation of hydrocarbons and CO2. Our technologies enable efficient separation processes for liquids and gas. We provide reliable services for compressors, turbines, motors, and generators through our global aftermarket network.

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