Introducing the SLZ end suction, long coupled, single stage centrifugal chemical process pump, a paragon of engineering excellence standardized to EN 22858 / ISO 2858. This dynamic pump finds its niche across a plethora of industries, including the industrial and marine sectors. Specifically engineered to handle low viscosity, clean, or slightly contaminated fluids, it operates seamlessly without the presence of solid or fibrous materials. The pump excels in moving fluids such as fresh water, sea water, and fuels like diesel, petrol, and kerosene. Discover its diverse applications: from fuel transfer, chemical processing, and energy plants to mining, firefighting, irrigation, water supply, water treatment, pressurization, grey water management, dewatering, and various marine uses.
Experience the sheer power and robust construction of this large, heavy-duty centrifugal chemical process pump. Designed for applications requiring high flow and pressure, it stands as a testament to reliability and performance.
Discover the unparalleled advantages of the long coupled centrifugal chemical process pump design, offering unmatched efficiency and operational benefits.
Maintenance becomes a breeze with the long coupled configuration, allowing easy access to the pump head without the hassle of motor removal.
Built for endurance, this process pump is engineered for continuous operation. Additional bearings in the pump head significantly reduce motor strain, ensuring robust and reliable performance.
The innovative back pull out design enables motor removal while keeping the pump attached to the pipework, resulting in significant time savings during maintenance or servicing.
With independent shafts for the centrifugal chemical process pump and motor, only the pump shaft requires replacement if damaged, a feature not available in less robust competitors, which necessitate replacing the entire motor shaft.
The long coupled design ensures ample space between the pump and motor, safeguarding the motor from potential fluid ingress in the event of a seal failure.
Product summary
• Specialized in pumping a broad spectrum of clean, low viscosity, or slightly contaminated fluids with precision.
• Flexible impeller choices: opt for a closed or semi-open impeller to suit your needs.
• Enjoy swift and hassle-free maintenance with the back pull out design.
• Operates efficiently at fluid temperatures up to 175°C, catering to demanding environments.
• Features a heavy-duty shaft isolated from fluid contact, enhancing durability and lifespan.
• Optional external seal cooling system available for optimal performance in diverse conditions.
• Independently designed pump and motor shafts for efficient maintenance and cost savings.
• Constructed in materials including cast iron, 316 stainless steel, duplex stainless steel, bronze, and customizable upon request.
• Suction and discharge flanges meet EN 1092-2 / PN 16 standards, with EN 1092-1 / PN 16 available for steel and stainless steel casings.
• Choose from gland packing or a variety of mechanical seals: single, double, and cartridge options are available.
• Equipped with three-phase 50hz / 60hz motors, with IP55 rating as standard for robust performance.
• ATEX-certified versions available upon request, ensuring compliance and safety in explosive environments.
• Obtain independent certification upon request to meet specific compliance requirements.
• Manufactured in strict accordance with EN 22858 / ISO 2858 standards, ensuring quality and reliability.
• Designed for low NPSH, minimizing cavitation risk and maximizing pump efficiency.
• Streamlined assembly without the need for alignment, simplifying installation and reducing downtime.
• All impellers are expertly balanced to ISO 1940 class 6.3, ensuring smooth and efficient operation.
• Long coupled with a sturdy baseplate, providing stability and robust support.
• API Seal installation available, compliant with API682 standards, for enhanced sealing performance.
• Integrated oil-lubricated ball bearings for extended service life and reduced maintenance.
| Pump Type |
Centrifugal |
| Max Flow Rate |
1500M³H |
| Max Head |
160M |
| Max Temp |
175°C |
| Max Viscosity |
200 cst |
| Max Solid Passage |
20mm |
| Self Priming |
N |
| Inlet/Outlet Sizes |
32mm to 250mm |
| Mechanical seal type |
Double mechanical seal, API plan |
| Pump Materials |
AISI304, AISI316, AISI316L, Bronze, Cast Iron, Cast Steel, Ductile Iron, Duplex, NiAl Bronze, Super Duplex |
Our centrifugal and chemical pumps stand apart with the incorporation of renowned brand bearings. These bearings ensure the pumps have an extended service life, even when operating in the most challenging environments, promising reliability and durability.
To expertly manage axial thrust, most impellers are equipped with strategically placed wear rings both at the front and back, alongside a balance hole on the impeller's back shroud. In instances where the axial thrust is minimal, some pumps are ingeniously designed without the need for a rear wear ring and balance hole.
Precision-engineered casting impellers guarantee top performance. Available in high-quality materials such as cast iron, stainless steel, and bronze, they elevate the pump's operational excellence.
We offer two principal configurations:
1) "Flush" - This involves the injection of a clean, cool liquid into the seal chamber to create an optimal operational environment. An additional smaller port, usually positioned downward, serves as a means for leakage observation or venting.
2) "Barrier or Buffer" systems with dual seals - A supplementary fluid is introduced between two sets of mechanical seals. This setup prevents ambient air from mingling with the pumped fluid, enhances seal cooling, and importantly, improves safety.
It's important to note that many mechanical seals operate efficiently without the need for special external flush systems.
Dynamic Flexible Couplings
Unlike their rigid counterparts, flexible couplings are adept at accommodating movement, such as vibrations and thermal expansion, without sustaining damage. They are perfect for situations involving inevitable misalignment between drive and pump shafts. Their ability to absorb vibrations not only protects components but also reduces noise levels during operation. While they feature an intricate and costlier design, their ability to safeguard shafts and bearings from damage and premature wear results in significant maintenance savings over time.
Semhai's API standard chemical pumps proudly utilize API 671 Standard Disc Couplings.
These couplings offer reduced reaction loads and superior balancing quality compared to standard couplings, thus enhancing the entire pump's power transmission efficiency and effectiveness.
| Industry |
Services |
| Chemicals, dyes & intermediates |
Organic/inorganic chemicals |
| Oil extraction & waste oil refineries |
Hydrocarbons/Volatile liquids |
| Bulk drugs & Pharmaceuticals |
Dyes & Intermediates |
| Effluent treatment plants |
Water treatment & distribution system |
| Heating & air conditioning plants |
Thermic fluid/ hot oil |
| Cooling towers |
Corrosive/abbrasive liquids |
Esteemed Professional Cooperation Agencies
Shanghai Semhai Pump Co., Ltd. is renowned for forging enduring partnerships with numerous prestigious domestic pump-testing authorities, such as:
The National Quality Supervision and Inspection Center of Industrial Pumps, located in Tiexi District, Shengyang city,
The Irrigation Machinery Products Quality Inspection Center of Machinery Industrial, situated in Zhenjiang City,
The Ministry of Agriculture's Water Pump Quality Supervision and Testing Center, based in Chongqing city,
And the Shanghai Mechanical and Electrical Products Quality Inspection Center, conveniently located in Shanghai city, among others.
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