Basic Info.

Model NO.

VS4-JHB

Max.Head

~55m

Max.Capacity

~3520m³/H

Driving Type

Motor

Impeller Number

Single-Stage Pump

Working Pressure

1.0 MPa

Influent Type of Impeller

Single Suction Pump

Position of Pump Shaft

Vertical Pump

Usage

Pump, Pumps

Diameter

50~600mm

Temperature

~120℃

International Certification

API / CE / ISO

Material Composition

Metals and Special Alloys

Feature1

Corrosion Resistant

Transport Package

Wooden Box Packaging

Specification

Customizable

Origin

China

This series achieves a maximum submerged depth of 3.6 meters. It employs a dual-support structure: above the liquid level, two rows of angular contact ball bearings bear axial loads; below the liquid level, one or two pairs of sliding bearings (i.e., shaft sleeves and bushings) bear radial loads. The flow-through components are crafted from high-quality JSB alloy material, resistant to high-temperature sulfuric acid corrosion, ensuring long service life.

Application Scope:

Used in drying and absorption cycle systems of sulfuric acid production, as well as for conveying finished concentrated sulfuric acid. Suitable for transporting sulfuric acid at temperatures ≤120°C with concentrations ranging from 93% to 98%, or fuming sulfuric acid at temperatures ≥105°C.

Specification

Company Profile

LSB series high-temperature concentrated sulfuric acid pump structural characteristics, technical features, and application industries
I have read 10 web pages
LSB Series High Temperature Concentrated Sulfuric Acid Pump Technology Explanation
The LSB series high-temperature concentrated sulfuric acid pump is a vertical single-stage single suction centrifugal pump designed specifically for transporting highly corrosive media such as high-temperature concentrated sulfuric acid. It is widely used in sulfuric acid production, metallurgy, environmental protection, and other fields.

1、 Structural characteristics
Specific description of structural composition
Pump type structure vertical single-stage single suction centrifugal pump, mainly composed of pump body, pump cover, impeller, shaft, bottom plate, intermediate connecting pipe, outlet pipe and seal, bearing, coupling, etc
The design of the suction pipe increases the length of the suction pipe, which shortens the length of the pump unit compared to ordinary submersible pump units at the same depth, improves the rigidity of the pump unit, and ensures stable and reliable operation
The axial force balance adopts the impeller back blade to balance the axial thrust, and the remaining axial force and rotor weight are borne by the rolling bearings
Standardization degree: Universal, high standardization degree, good interchangeability, easy disassembly and maintenance
Installation requirements: Before starting, the liquid level must be above the centerline of the impeller; Turn counterclockwise when viewed from the motor towards the pump end
2、 Technical features
1. Material characteristics (core technology)
The core technology of LSB pump lies in the special corrosion-resistant material of the overcurrent components:

Characteristics of component material selection
Overcurrent components XY-21, XY-31 alloy/IMRC-1 (lewmet 55) alloy/20 alloy are resistant to high temperatures and concentrated sulfuric acid corrosion, with a long service life
Special corrosion-resistant cast iron for other components, balancing economy and corrosion resistance
💡  Source of materials: some manufacturers cooperate with the Institute of Metals, Chinese Academy of Sciences, Shanghai Jiaotong University, Jiangsu University of Technology and other scientific research institutions to develop.

2. Hydraulic performance characteristics
Characteristic Description
Excellent hydraulic model screening for high-performance hydraulic models with stable operational performance
Efficient, energy-saving, wide coverage area, high operating efficiency, significant energy-saving effect
Low vibration and low noise, measured vibration and noise meet B-level standards
3. Performance parameter range
Parameter Range Remarks
The flow rate (Q) varies slightly from 10 to 2000 m ³/h depending on the parameters of different manufacturers
Lift (H) 15-50 meters
Working temperature: 98% concentrated sulfuric acid:<125 ℃/93% sulfuric acid:<80 ℃
The maximum design pressure can reach 2.5MPa
Applicable temperature range -80~350 ℃, some manufacturers claim
4. Explanation of Model Meaning
Taking 50LSB-25A as an example:

LSB: High temperature concentrated sulfuric acid pump code

50: Rated flow rate (m ³/h)

25: Rated head (m)

A: Number of blade cuts (A is the first cut)

3、 Application industry
Specific application scenarios in the industry field
Sulfur based sulfuric acid production, pyrite based sulfuric acid production, waste acid recovery, sulfuric acid storage tank transportation and circulation in the sulfuric acid industry
Transportation of highly corrosive media such as high-temperature concentrated sulfuric acid in chemical processes in the chemical industry
Transportation of cleaning and pickling solutions in the metal smelting process of the metallurgical industry
Environmental protection industry wastewater treatment, flue gas desulfurization recovery, and transportation of sulfuric acid containing waste liquid in waste gas treatment
Acidic medium transportation in the petroleum/power, petrochemical, and thermal power industries
In other industries such as pharmaceuticals, pesticides, dyes, papermaking, and food that require the transportation of high-temperature concentrated sulfuric acid
4、 Typical Performance Parameters Table (Partial Models)
Pump model, flow rate (m ³/h), head (m), speed (r/min), efficiency (%), matched power (kW)
25LSB-40    25    40    2950    60    11
55LSB-40    55    40    2950    66    22
100LSB-40    100    40    2950    68    37
100LSB-50    100    50    2950    74    45
200LSB-30    200    30    1450    78    55
80LSB-30    80    30    1450    65    30
Data source:

5、 Summary of Core Advantages
Specific manifestation of advantages
The overcurrent components with strong corrosion resistance are made of corrosion-resistant materials such as XY-21/XY-31 alloy and IMRC-1 alloy, designed specifically for high-temperature concentrated sulfuric acid working conditions
Stable operation, extended suction pipe design enhances rigidity, and measured vibration and noise meet B-level standards
Efficient and energy-saving excellent hydraulic model, high efficiency, low energy consumption
Convenient maintenance, standardized design, easy disassembly and assembly, good interchangeability
Long lifespan: The site has been operating continuously for 6 months and remains stable, with an expected lifespan of over 2 years
Economic localization rate of 100%, with prices lower than similar imported pumps
Do you need me to help you further analyze the promotion strategy of LSB pumps in the Russian market, or compare them with other pump types (such as API610 chemical pumps)?

Technical characteristics of Sulzer high-temperature concentrated sulfuric acid pump
Sulzer's technology in the field of high-temperature concentrated sulfuric acid pumps is represented by the VAS series vertical acid pumps, whose core innovation lies in fundamentally solving the radial force problem of traditional volute pumps under corrosive conditions.

1、 Core technical features
1. Symmetrical Diffusor Casing - Core Breakthrough
This is the core technical advantage of Sulzer's high-temperature concentrated sulfuric acid pump, which is fundamentally different from the traditional volute structure of the LSB series:

Comparison dimension of traditional volute pump Sulzer VAS pump (symmetrical guide shell)
Radial force generates radial thrust, causing shaft deflection and vibration to cancel each other out, without producing harmful radial thrust
The vibration level deteriorates exponentially as the gap increases, maintaining low vibration throughout the entire flow range
Bearing wear, shaft sleeve bearings, and rolling bearings are prone to wear, greatly reducing bearing wear and extending service life
Efficiency stability is maintained only at the design operating point, with the optimal efficiency remaining stable throughout the entire flow range
Technical principle: The symmetrical guide shell structure evenly distributes the fluid thrust, eliminating the radial thrust generated by traditional snail shell geometry, thereby controlling vibration and shaft deflection at the lowest level.

2. Unique outflow structure design
Structural characteristics, technical specifications, engineering value
No outflow branch pipe flows out through the suspended column, eliminating the need for a separate outflow branch pipe to eliminate stress corrosion caused by thermal expansion differences
Only one acid/gas interface is present in the outflow column of a single acid/gas interface (traditional designs have four), significantly reducing the risk of corrosion
The compact vertical turbo pump structure is installed on the top of the tank, which is safe, reliable, easy to install and maintain
3. Materials and temperature resistance performance
Performance indicators: Sulzer VAS pump parameters
Applicable medium sulfuric acid (H ₂ SO ₄)
Concentration range 92%~99.9%
Temperature range of 60~150 ° C (heat recovery system can reach 250 ° C)
Flow range up to 2800 m ³/h
Lift range 20~30 m
💡  Key difference: Sulzer VAS pumps are mainly designed for high flow, low head circulation conditions in sulfuric acid plants (drying tower, absorption tower, heat recovery system), while the LSB series covers a wider head range (15-50m).

2、 Comparison of Sulzer and LSB series technologies
Comparison Dimension: Sulzer VAS Series LSB Series (Typical in China)
Core structure: symmetrical guide shell (eliminating radial force), traditional snail shell+back blade to balance axial force
Core technological advantages include low vibration and long lifespan across the entire flow range, balanced axial thrust of the back blades
Maximum temperature 250 ° C (heat recovery system) 125 ° C (98% concentrated sulfuric acid)
Maximum flow rate 2800 m ³/h 2000 m ³/h
Head range: 20-30 m (low head) 15-50 m (medium low head)
Applicable scenarios: sulfuric acid plant circulation pump (drying tower, absorption tower), sulfuric acid transportation, circulation, and storage tank transportation
The lifespan performance is more than twice that of traditional equipment, and MTBM significantly extends on-site continuous operation for more than 6 months with stability
3、 Sulzer's other related acid pump technologies
In addition to the VAS series, Sulzer has accumulated multiple technologies in the field of acidic medium pumping

1. AHLSTAR WPP series - wear-resistant end suction pump
Specially designed for highly corrosive working conditions in the phosphate fertilizer industry, suitable for high-temperature phosphoric acid and solid containing slurries:

Specific description of technical features
Speed optimization reduces operating speed (<850 rpm), using full diameter impellers to reduce wear
Wear resistant design with semi open impeller and front wear-resistant plate, extending the service life of vulnerable parts to 12-24 months
Material selection: 654 SMO super austenitic stainless steel, resistant to high temperature and perchloric acid corrosion
75% reduction in maintenance frequency compared to traditional equipment
2. CAHR series axial flow pump - high flow evaporation cycle
Suitable for high flow and low head conditions such as phosphoric acid concentration and evaporator circulation:

Specific description of technical features
Operating life: Continuous operation for 8 years without major repairs
Material configuration shell SS904L, impeller and wear-resistant ring made of high-grade alloy 28, shaft made of super duplex steel
Welding shell has a higher cost than casting, but it has better surface quality, better material uniformity, and significantly improved corrosion resistance
The initial investment for replaceable wear-resistant rings is slightly higher, but it avoids replacing the entire shell and reduces long-term maintenance costs
3. ZE/ZF series end suction pump - high temperature and high pressure industrial pump
Suitable for high temperature conditions such as hydrocarbons and heat transfer fluids:

Specific description of technical features
Temperature capability up to 425 ° C
Pressure capacity up to 100 bar
The installation of the centerline is suitable for thermal expansion and does not affect the axis alignment
Strengthening the low axis deflection of the shaft, extending the sealing and bearing life
4、 Summary of Sulzer's technological advantages
Advantage Dimension Core Technology Customer Value
Extended lifespan: Symmetrical guide shell eliminates radial forces and has a lifespan more than twice that of traditional equipment, significantly extending MTBM
Stable under all operating conditions, low vibration within the full flow range, independent of the optimal efficiency point, reliable operation
High temperature resistant special materials+structural design up to 250 ° C (heat recovery system)
Low maintenance cost modular design+replaceable wear-resistant parts reduce maintenance frequency by 75%
Advanced materials such as 654 SMO, super duplex steel, and alloy 28 are used in materials engineering to cope with high corrosion and high abrasion conditions
5、 Core differences from LSB series
From a technical perspective, Sulzer and LSB series represent two different design philosophies:

Dimension Sulzer LSB Series
Design philosophy eliminates the source of radial force (symmetrical guide shell) and balances axial force (back blade)
Advantageous operating conditions: high flow circulation (drying tower, absorption tower), flow transport (storage tank, pipeline)
Head characteristics: low head (20-30m), medium head (15-50m)
Maximum temperature 250 ° C 125 ° C
Advanced alloy core material (654 SMO, alloy 28) XY-21/XY-31 alloy IMRC-1
Conclusion: Sulzer's technological advantage lies in the symmetrical guide shell structure, which completely eliminates radial forces and performs particularly well in the cyclic conditions of high flow, high temperature, and high corrosion sulfuric acid plants. The LSB series is a mature domestic solution for medium flow rate, medium head, and high-temperature concentrated sulfuric acid transportation conditions, with higher cost-effectiveness.

The technical core of Flowserve in the field of high-temperature concentrated sulfuric acid pumps is usually reflected in its vertical wet pit pumps and cantilever end suction pumps, especially in the specialized design for the circulation conditions of drying towers and absorption towers in sulfuric acid plants. Its technical characteristics mainly focus on three aspects: corrosion-resistant materials, thermal expansion management, and sealing systems, aiming to cope with the strong corrosiveness and thermal stress of concentrated sulfuric acid at high temperatures (usually above 120 ° C).

The following are the key characteristics based on industry general technical data compilation:

1. Anti corrosion material technology
High temperature concentrated sulfuric acid has extremely strong corrosiveness on metal materials, and Volkswagen usually uses high chromium alloys or specific grades of austenitic stainless steel (such as CD4MCu, Duratec 20, etc.) to cope with it.

Corrosion resistant alloys: High chromium white cast iron or duplex stainless steel are widely used for overcurrent components, which can form a dense passivation film in concentrated sulfuric acid and resist erosion corrosion at high temperatures.

Hardening treatment: For severely worn parts such as impeller rings and shaft sleeves, surface hardening treatment or hard alloy welding is usually used to extend the service life of the equipment in acid solutions containing solid particles.

2. Cantilever design
For the common high flow and low head requirements in sulfuric acid plants, Volkswagen often uses heavy-duty cantilever single-stage centrifugal pumps.

Eliminating radial forces: Some high-end models adopt a double volute design, which can effectively balance radial forces, reduce shaft deflection under high temperature conditions, and thus extend the life of mechanical seals and bearings.

Heavy duty bearing box: The design of the bearing box usually complies with ISO or API 610 standards, with a large oil chamber volume, which can effectively dissipate heat and ensure lubrication reliability in high temperature environments.

3. Thermal expansion management and installation methods
The temperature of the concentrated sulfuric acid pump changes dramatically during operation, and thermal expansion treatment is the technical key.

Centerline support: The pump body usually adopts a centerline support structure. When pumping high-temperature liquids, the pump body expands uniformly along the centerline due to heat, ensuring that the axis's neutrality is not affected and avoiding vibration and seal failure caused by thermal deformation.

Vertical structure: For submersible pumps or tank pumps, Volkswagen adopts an extended rigid shaft design and guide bearings to ensure stable operation even in deep groove installations.

4. Sealing system
The sealing difficulty of high-temperature concentrated sulfuric acid is extremely high. Volkswagen usually uses containerized mechanical seals and is equipped with specific flushing schemes (such as API Plan 11, 52, 62, etc.).

Perfluoroether rubber seals: In high-temperature concentrated sulfuric acid environments, standard rubber parts will rapidly carbonize. Volkswagen usually uses perfluoroether rubber (FFKM) or specific polytetrafluoroethylene (PTFE) materials as auxiliary sealing rings to ensure long-term stability at high temperatures around 150 ° C.

Quick cooling and flushing: In response to possible crystallization or scaling issues, the sealing system usually reserves a quick cooling interface to prevent damage to the sealing surface.

5. Application and selection suggestions
Applicable scenarios: Usually used for drying tower circulation pumps, absorption tower circulation pumps, and heat recovery systems in sulfur based sulfuric acid plants.

Performance range: The flow rate of common models can usually reach several hundred to several thousand cubic meters per hour, and the head is generally between 20-50 meters (in line with the circulation resistance requirements inside the tower).

Differences from Sulzer/domestic pumps: Volkswagen's design focuses more on the strict implementation of API 610 standards and heavy machinery structures. Compared to Sulzer's "symmetrical guide shell" design, Volkswagen has strong technical accumulation in the rigid design of cantilever pumps and the complex configuration of sealing systems; Compared to the domestically produced LSB series, Volkswagen is usually more conservative and redundant in the calculation of material grades and high-temperature thermal compensation structures.

If you have specific operating parameters on hand (such as specific flow rate, temperature, whether there are impurities), or would like to know the corresponding model of Volkswagen (such as LVS or LNN series), you can provide more details and I will help you further verify the technical compatibility.