Introducing the SLZ end-suction, long-coupled, single-stage centrifugal chemical process pump, meticulously standardized to EN 22858 / ISO 2858, serving a vast array of applications across industrial and marine markets. Engineered for excellence, this pump effortlessly handles low-viscosity clean or mildly contaminated fluids without solid or fibrous interference. It excels in transporting fresh water, sea water, as well as fuels such as diesel, petrol, and kerosene. Ideal for fuel transfer, chemical processing, energy plants, mining, firefighting, irrigation, water supply, treatment, pressurization, grey water management, dewatering, and marine applications.
Experience the power of a large, heavy-duty centrifugal chemical process pump, built with exceptional high-flow and high-pressure capabilities.
The long-coupled centrifugal chemical process pump design offers a multitude of advantages, enhancing efficiency and performance.
Maintenance has never been easier with the long-coupled configuration, allowing direct access to the pump head without motor removal.
Designed for relentless operation, this robust process pump incorporates additional bearings in the pump head, significantly reducing motor strain during ongoing use.
The back pull-out design enables motor removal while the pump remains connected to the pipework, streamlining maintenance and saving valuable time.
Our centrifugal chemical process pump boasts independent shafts for both pump and motor. In the rare event of shaft failure, only the pump shaft requires replacement. Unlike other market offerings that rely on motor shafts, this design prevents entire motor replacements, ensuring cost efficiency.
The long-coupled design ingeniously creates a generous space between pump and motor, safeguarding the motor from fluid ingress in case of seal failure.
Product Summary
• Capable of pumping a diverse array of clean, low-viscosity, or slightly contaminated fluids with ease.
• Options available for closed or semi-open impeller, catering to specific needs.
• Quick and effortless maintenance is assured with the back pull-out design.
• Handles fluid temperatures up to a maximum of 175°C with reliability.
• Features a heavy-duty shaft shielded from fluid contact, ensuring durability.
• Optional external seal cooling system available for enhanced performance.
• Separate shafts for pump and motor, facilitating easy repairs and maintenance.
• Available in a range of materials including cast iron, 316 stainless steel, duplex stainless steel, bronze, and other materials by request.
• Suction and discharge flanges conform to EN 1092-2 / PN 16, with flanges adhering to EN 1092-1 / PN 16 for steel and stainless steel cases.
• Choose from gland packing or single, double, and cartridge mechanical seal options for optimal sealing solutions.
• Equipped with robust three-phase 50Hz / 60Hz motors, IP55 rated as standard.
• ATEX-certified versions available upon request for hazardous environments.
• Acquire independent certification if required, ensuring compliance and quality assurance.
• Manufactured to meet the rigorous standards of EN 22858 / ISO 2858, guaranteeing quality and reliability.
• Designed for low NPSH (Net Positive Suction Head), minimizing cavitation risks.
• Hassle-free assembly without the need for alignment, simplifying setup.
• All impellers are precision balanced according to ISO 1940 class 6.3 for smooth operation.
• Long-coupled with a sturdy baseplate for stability and performance.
• Option to install an API Seal as per API682, ensuring industry compliance and enhanced sealing.
• Ball bearings lubricated with oil for longevity and reduced maintenance requirements.
| 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 pumps, particularly those designed for chemical applications, are equipped with renowned brand bearings. These esteemed bearings significantly extend the service life of our pumps, ensuring unparalleled durability and performance even in the most challenging conditions.
To expertly balance axial thrust, our designs incorporate wear rings both at the front and rear of the impeller, complemented by a balance hole on the back shroud. For pumps where axial thrust is minimal, these features may be omitted, ensuring optimal design efficiency without unnecessary components.
Our high-precision casting impellers are crafted to ensure superior performance. Available in durable materials such as cast iron, stainless steel, and bronze, they deliver exceptional reliability and strength.
Our advanced systems are categorized into two primary groups:
1) "Flush" - This method introduces a clean, cool liquid into the seal chamber, significantly enhancing the operational environment. An additional, smaller port, typically oriented downward, facilitates leakage observation or functions as a vent opening.
2) "Barrier or Buffer" for dual seals - This approach involves feeding a secondary fluid into the space between two mechanical seals. This prevents ambient air from interacting with the pumped liquid, improves seal cooling, and significantly enhances safety.
It's noteworthy that not all mechanical seals necessitate specialized external flush arrangements, emphasizing the adaptability of our designs.
Flexible couplings
Flexible couplings distinguish themselves from rigid variants by accommodating movement such as vibrations and thermal expansion, without incurring damage. Perfect for situations with unavoidable misalignment between drive and pump shafts, they effectively dampen vibrations, thus reducing operating noise. Although they feature a more intricate and costly design, the long-term maintenance savings due to protection against shaft and bearing damage are considerable.
Semhai's API standard chemical pumps integrate API 671 Standard Disc Couplings, ensuring optimal performance.
These couplings offer lower reaction loads and superior balancing quality compared to conventional couplings, significantly enhancing the efficiency and effectiveness of overall pump power transmission.
| 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 |
Professional cooperation agencies
Shanghai Semhai Pump Co., Ltd. has forged enduring partnerships with an array of prominent domestic pump-testing institutions. Through our collaborative efforts, we ensure the highest standards of quality and performance for our products. Our esteemed partners include:
The National Quality Supervision and Inspection Center of Industrial Pumps, located in Tiexi District, Shenyang City, where rigorous testing guarantees excellence.
The Irrigation Machinery Products Quality Inspection Center of Machinery Industrial in Zhenjiang City, a testament to our commitment to superior irrigation solutions.
The Ministry of Agriculture's Water Pump Quality Supervision and Testing Center in Chongqing City, ensuring agricultural innovations meet stringent standards.
The Shanghai Mechanical and Electrical Products Quality Inspection Center in Shanghai City, among others, to continually uphold our product integrity and reliability.
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