The SLZ end suction, long coupled, single stage centrifugal chemical process pump is engineered to meet the rigorous standards of EN 22858 / ISO 2858, a testament to its versatility and reliability across industrial and marine markets. Crafted for precision, it effortlessly handles low viscosity clean or mildly contaminated fluids, ensuring efficient operation free from solid particles or fibrous debris. This pump is adept at managing a diverse range of liquids, including fresh water, sea water, and various fuels such as diesel, petrol, and kerosene. Its adaptability shines in applications spanning fuel transfer, chemical processing, energy generation, mining, fire fighting, irrigation, water supply, water treatment, pressurization, grey water management, dewatering, and marine environments.
This robust centrifugal chemical process pump, designed for high performance, boasts exceptional flow and pressure capabilities, making it ideal for demanding industrial applications.
The long coupled centrifugal chemical process pump design offers a multitude of advantages that enhance operational efficiency and maintenance.
Thanks to its long coupled configuration, maintenance becomes a breeze as the pump head is easily accessible without the need to detach the motor.
Engineered for continuous and reliable performance, this process pump features additional bearings in the pump head, effectively reducing motor strain and enhancing durability.
Its innovative back pull out design allows for the motor's effortless removal while keeping the pump connected to the pipework, significantly reducing downtime during maintenance.
Featuring independent shafts for the pump and motor, this design ensures only the pump shaft needs replacement in case of breakage, unlike less robust models where the entire motor must be replaced.
The ample space provided by the long coupled design effectively safeguards the motor from fluid intrusion, even in the event of a seal failure.
Product summary
• Capable of efficiently pumping a diverse array of clean, low viscosity, or slightly contaminated fluids
• Offered with either closed or semi-open impeller configurations for versatility
• Quick and easy maintenance facilitated by the back pull out design
• Accommodates fluids with a maximum temperature of 175°C
• Heavy-duty shaft engineered to remain uninfluenced by fluid contact
• External seal cooling system available for enhanced operational reliability
• Distinct and independent pump and motor shafts enhance durability
• Constructed from materials such as cast iron, 316 stainless steel, duplex stainless steel, bronze, with additional options upon request
• Suction and discharge flanges meet EN 1092-2 / PN 16 standards, with options for steel and stainless steel casings per EN 1092-1 / PN 16
• Versatile sealing options including gland packing, single, double, and cartridge mechanical seals
• Available with three-phase 50hz / 60hz motors, IP55 rated as standard for robust performance
• ATEX certification available upon request, ensuring suitability for hazardous environments
• Independent certification available upon request, assuring quality and compliance
• Manufactured in strict accordance with EN 22858 / ISO 2858 standards for assured quality
• Features low NPSH for enhanced efficiency and reduced cavitation risk
• Simplified assembly with no alignment required, streamlining installation processes
• All impellers are meticulously balanced according to ISO 1940 class 6.3 standards for optimal performance
• Long coupled design mounted on a robust baseplate for stability and durability
• Options for API Seal installation, conforming to API682 standards for high reliability
• Oil lubricated ball bearings for smooth, enduring operation and maintenance ease
| 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 are reinforced with renowned brand bearings, ensuring they withstand even the harshest environments with grace and reliability, promising an extended service life that surpasses expectations.
To expertly manage axial thrust, our innovative design employs dual wear rings positioned both in front and at the rear of most impellers, coupled with a strategically placed balance hole on the back shroud. For some pumps where axial thrust is minimal, a streamlined design without rear wear rings and balance hole is seamlessly integrated.
Our high-precision casting impeller is the epitome of performance excellence, crafted from premium materials such as cast iron, stainless steel, and bronze, ensuring unrivaled reliability and function.
Our design philosophy is centered around two primary configurations:
1) "Flush" - A pristine, cool liquid is meticulously introduced into the seal chamber, enhancing the operational environment. A strategically placed second port, often oriented downward, serves as a vigilant observer for leakage or venting purposes.
2) "Barrier or Buffer" for dual seals - An auxiliary fluid is skillfully introduced between two mechanical seals, forming a protective shield against ambient air, optimizing seal cooling, and enhancing overall safety.
It is crucial to note that not every mechanical seal necessitates specialized external flush configurations.
Adaptable Connections: Flexible Couplings
Distinguished from rigid couplings, flexible couplings offer remarkable adaptability to movements such as vibrations and thermal expansions, making them indispensable for setups with unavoidable misalignment between drive and pump shafts. Their superior vibration absorption capabilities also help in significantly reducing operational noise. Although this sophisticated design may come at a premium, the long-term benefits of safeguarding shafts and bearings from damage and premature wear result in substantial maintenance savings.
The Semhai API chemical pumps integrate the API 671 Standard Disc Couplings, setting a benchmark for industry standards.
These couplings deliver lower reaction loads and superior balancing quality compared to conventional couplings, thus enhancing the entire power transmission efficiency and effectiveness of our pumps.
| 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 cultivated enduring partnerships with premier domestic pump-testing institutions to ensure the highest standards of quality and performance.
These prestigious collaborations include the National Quality Supervision and Inspection Center of Industrial Pumps in the heart of Tiexi District, Shengyang city,
the renowned Irrigation Machinery Products Quality Inspection Center of Machinery Industrial located in Zhenjiang City,
and the esteemed Ministry of Agriculture, Water Pump Quality Supervision and Testing Center nestled in Chongqing city,
as well as the distinguished Shanghai Mechanical and Electrical Products Quality Inspection Center in the bustling metropolis of Shanghai city, among others.
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