The SLZ end suction, long-coupled, single-stage centrifugal chemical process pump is meticulously engineered to meet EN 22858 / ISO 2858 standards. This versatile pump excels across a vast spectrum of industrial and marine applications, handling low-viscosity, clean or slightly contaminated fluids with ease, devoid of solid or fibrous materials. It's adept at transferring fresh water, sea water, and a variety of fuels like diesel, petrol, and kerosene. Its diverse applications span from fuel transfer and chemical processes to energy plants, mining, firefighting, irrigation, water supply, treatment, pressurization, grey water management, dewatering, and marine settings.
Introducing a powerhouse in the world of centrifugal pumps: a large, heavy-duty centrifugal chemical process pump crafted for exceptional high flow and high-pressure performance.
The long-coupled centrifugal chemical process pump design promises an array of benefits, optimizing functionality and maintenance.
Its long-coupled configuration ensures seamless maintenance, providing easy access to the pump head without necessitating the removal of the motor, saving time and reducing hassle.
This robust process pump is engineered for continuous operation, fortified with additional bearings in the pump head. These bearings significantly reduce strain on the motor during operation, enhancing durability and reliability.
The innovative back pull-out design allows for the motor's removal while keeping the pump connected to the pipework, substantially reducing downtime during servicing or maintenance.
With independent shafts for the pump and motor, this centrifugal chemical process pump ensures that in the unlikely event of a shaft breakage, only the pump shaft requires replacement. In contrast, less resilient pumps rely solely on the motor shaft, necessitating a complete motor replacement if it breaks.
The long-coupled design creates a generous space between the pump and motor, offering enhanced protection for the motor from potential fluid ingress in the event of a seal failure.
Product Summary
• Capable of pumping a diverse array of clean, low-viscosity, or slightly contaminated fluids
• Available with either closed or semi-open impeller options
• Features a back pull-out design for swift and effortless maintenance
• Handles maximum fluid temperatures up to 175°C
• Heavy-duty shaft engineered to remain unaffected by fluid contact
• Optional external seal cooling system available
• Distinct pump and motor shafts for easy maintenance
• Choice of materials, including cast iron, 316 stainless steel, duplex stainless steel, bronze, and more upon request
• Suction and discharge flanges adhere to EN 1092-2 / PN 16; steel and stainless steel casings comply with EN 1092-1 / PN 16
• Offers gland packing, single, double, and cartridge mechanical seal options
• Equipped with three-phase 50Hz / 60Hz motors; IP55 standard protection
• ATEX-certified versions available upon request
• Independent certification can be arranged upon request
• Crafted in compliance with EN 22858 / ISO 2858 standards
• Exhibits low NPSH for optimal performance
• Enables assembly without alignment complexities
• All impellers are precision-balanced as per ISO 1940 class 6.3
• Long-coupled design with a sturdy baseplate
• API Seal installation available, conforming to API682 standards
• Incorporates oil-lubricated ball bearings for enhanced 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 |
Our centrifugal and chemical pumps boast the incorporation of renowned brand bearings, ensuring superior durability and performance. Even amidst challenging environments, expect a longer service life from our innovative pump solutions.
To expertly manage axial thrust, our impellers are equipped with strategically placed wear rings at both the front and back, complemented by a balance hole on the back shroud. In pumps where axial thrust is minimal, these components are omitted, demonstrating our tailored engineering approach.
Our high-precision casting impellers guarantee exceptional performance, available in robust materials such as cast iron, stainless steel, and bronze, offering reliability and versatility for diverse applications.
There are generally two main groups:
1) "Flush" - This technique involves injecting a clean, cool liquid into the seal chamber, optimizing the operating environment. A secondary, smaller port, typically oriented downward, is included for leakage observation or venting purposes.
2) "Barrier or Buffer" for dual seals - This method employs a secondary fluid introduced between two mechanical seal sets. Its purpose is to prevent ambient air contact with the pumped fluid, enhance seal cooling, and bolster operational safety.
Notably, not all mechanical seals necessitate specialized external flush setups, offering flexibility in application.
Flexible couplings
In contrast to rigid couplings, flexible couplings adeptly handle movements such as vibrations and thermal expansion, preventing damage. Ideal for scenarios with inevitable misalignment, they also minimize operating noise, though they feature a more intricate and costly design. Nevertheless, they safeguard the shaft and bearings from damage and premature wear, leading to significant maintenance savings over time.
Semhai's API standard chemical pumps employ the robust API 671 Standard Disc Couplings.
These couplings offer reduced reaction loads while delivering superior balancing quality, enhancing the overall efficiency and effectiveness of the 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 |
Professional Cooperation Agencies
Our esteemed company, Shanghai Semhai Pump Co., Ltd., has forged enduring partnerships with prestigious domestic pump-testing institutions, ensuring uncompromising quality. Among our valued partners are:
The National Quality Supervision and Inspection Center of Industrial Pumps located in the Tiexi District of Shengyang city, renowned for its stringent standards,
The Irrigation Machinery Products Quality Inspection Center, situated in Zhenjiang City, which is celebrated for its meticulous inspection processes,
The Ministry of Agriculture, Water Pump Quality Supervision and Testing Center in Chongqing city, known for its expertise in agricultural pump assessment,
The Shanghai Mechanical and Electrical Products Quality Inspection Center, based in the vibrant city of Shanghai, and other eminent institutions.
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