The SLZ end suction, long coupled, single stage centrifugal chemical process pump is meticulously standardized to EN 22858 / ISO 2858, making it ideal for a vast array of applications in industrial and marine sectors. This engineering marvel is crafted to handle low viscosity, clean, or slightly contaminated fluids, adeptly avoiding solid or fibrous material interference. Regularly tasked with transporting fresh water, sea water, and fuels such as diesel, petrol, and kerosene, its versatility shines in applications like fuel transfer, chemical processing, energy plants, mining, fire fighting, irrigation, water supply, water treatment, pressurization, handling grey water, dewatering, and in marine environments.
Offering robust performance, this large and heavy duty centrifugal chemical process pump boasts exceptional high flow and high pressure capabilities, ensuring it meets the rigorous demands of industrial applications.
The innovative long coupled centrifugal chemical process pump design delivers numerous advantages, providing efficiency, reliability, and ease of maintenance to users.
Renowned for its user-friendly maintenance, the long coupled configuration allows easy access to the pump head without motor removal, simplifying operational processes.
Engineered for durability and continuous operation, this robust process pump features additional bearings strategically integrated into the pump head, significantly reducing motor strain during operation.
The back pull out design is an ingenious feature that permits motor removal while keeping the pump connected to the pipework, offering substantial time savings during maintenance and servicing.
Distinctively designed with independent shafts for the pump and motor, this configuration ensures that only the pump shaft requires replacement should it break, unlike less resilient models that necessitate complete motor replacement.
Exemplifying the benefits of a long coupled design, this configuration establishes ample space between the pump and motor, safeguarding the motor from fluid ingress in the event of seal failure.
Product summary
• Capable of pumping an extensive variety of clean, low viscosity, or slightly contaminated fluids, enhancing versatility.
• Available with either a closed or semi-open impeller for tailored performance.
• Back pull out design ensures quick and easy maintenance, minimizing downtime.
• Handles fluid temperatures up to 175°C, catering to a wide range of industrial needs.
• Heavy duty shaft design prevents fluid contact, extending the lifespan of the equipment.
• Optional external seal cooling system enhances operational efficiency.
• Independent pump and motor shafts offer maintenance and operational advantages.
• Constructed in a variety of materials, including cast iron, 316 stainless steel, duplex stainless steel, and bronze, with custom options available upon request.
• Suction and discharge flanges conform to EN 1092-2 / PN 16 standards, with EN 1092-1 / PN 16 available for steel and stainless steel casings.
• Offers gland packing or single, double, and cartridge mechanical seal options for diverse application requirements.
• Equipped with three-phase 50hz / 60hz motors, IP55 as standard, ensuring robust performance.
• ATEX-compliant versions available upon request, meeting safety standards for explosive environments.
• Independent certification options available upon request, affirming quality and compliance.
• Manufactured in strict accordance with EN 22858 / ISO 2858 standards, ensuring reliability and quality.
• Designed with low NPSH, enhancing pump efficiency and reducing cavitation risk.
• Facilitates assembly without alignment, streamlining installation processes.
• All impellers are precision-balanced to ISO 1940 class 6.3, guaranteeing smooth operation.
• Long coupled with baseplate for added stability and ease of installation.
• API Seal installation option available, adhering to API682 standards for enhanced safety and reliability.
• Features oil-lubricated ball bearings, optimizing performance and longevity.
| 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 |
Renowned for their reliability, our centrifugal and chemical pumps are equipped with prestigious brand bearings, ensuring an extended service life even in the most challenging environments.
To adeptly balance axial thrust, our pumps feature wear rings at both the forefront and rear of the impeller, complemented by a balance hole strategically placed on the back shroud. In some models, where axial thrust is not substantial, the back wear ring and balance hole are omitted, maintaining efficiency and precision.
Our high-precision casting impellers guarantee optimal performance, crafted meticulously from robust materials such as cast iron, stainless steel, and bronze.
Typically, there are two fundamental categories:
1) "Flush" - This method injects a clean, cool liquid into the seal chamber, enhancing the operational environment. A secondary, smaller port is often oriented downward for leakage observation or venting.
2) "Barrier or Buffer" for dual seals - This involves introducing a secondary fluid to the space between two mechanical seals, preventing ambient air contact with the pumped fluid. This enhances seal cooling and elevates safety measures.
It's important to note that not all mechanical seals necessitate unique external flush setups.
Flexible couplings
Differing from rigid couplings, flexible couplings accommodate slight movements such as vibrations and thermal expansion without incurring damage. This flexibility makes them ideal for scenarios with unavoidable misalignment between drive and pump shafts. Their vibration absorption capabilities also reduce excessive operational noise. Despite their initially higher complexity and cost, flexible couplings offer long-term savings by safeguarding shafts and bearings from damage and premature wear.
Our Semhai API standard chemical pumps incorporate API 671 Standard Disc Couplings, setting a benchmark in performance.
These couplings deliver lower reaction loads and superior balancing quality compared to traditional couplings, significantly boosting the efficiency and performance of the entire pump power transmission system.
| 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. proudly maintains robust and enduring partnerships with a distinguished array of prominent domestic pump-testing institutions, including:
The National Quality Supervision and Inspection Center of Industrial Pumps located in Tiexi District, Shenyang city, renowned for its meticulous standards and evaluation expertise,
The Irrigation Machinery Products Quality Inspection Center of Machinery Industrial in Zhenjiang City, celebrated for its precise assessments and comprehensive inspection protocols,
The Ministry of Agriculture's Water Pump Quality Supervision and Testing Center in Chongqing city, noted for its rigorous quality oversight and advanced testing capabilities,
Shanghai Mechanical and Electrical Products Quality Inspection Center in Shanghai city, distinguished for its state-of-the-art facilities and rigorous quality assurance measures, among others.
Audited Supplier 
){kind=link}