The SLZ End-Suction, Long-Coupled, Single Stage Centrifugal Chemical Process Pump is a masterpiece of engineering excellence. Standardized to EN 22858 / ISO 2858, this versatile pump excels across a spectrum of industrial and marine applications. With a design tailored for pumping low viscosity clean or slightly contaminated fluids, it excludes solid or fibrous impurities, making it ideal for liquids like fresh water, sea water, and various fuels including diesel, petrol, and kerosene. Its robust capabilities shine in diverse applications such as fuel transfer, chemical processing, energy generation, mining, firefighting, irrigation, water supply, treatment, pressurization, grey water management, dewatering, and maritime operations.
This formidable, heavy-duty centrifugal chemical process pump boasts high flow and high pressure capabilities, making it a powerhouse for demanding industrial tasks.
The ingenious long-coupled centrifugal chemical process pump design offers an array of advantages.
With its long-coupled configuration, maintenance becomes a breeze, allowing access to the pump head without the hassle of removing the motor, ensuring seamless operation.
Crafted for relentless operation, this process pump is reinforced with additional bearings in the pump head, significantly reducing motor strain and enhancing durability for continuous use.
Thanks to its innovative back pull-out design, the motor can be effortlessly detached while the pump remains connected to the pipework, facilitating quick and efficient maintenance, thereby saving valuable time.
Featuring independent shafts for the pump and motor, this design ensures only the pump shaft requires replacement if compromised. In contrast, less robust models rely solely on the motor shaft, necessitating full motor replacement upon failure.
The strategic long-coupled design creates a protective buffer between the pump and motor, safeguarding against fluid ingress in the event of seal failure, thus preserving motor integrity.
Product Summary
• Capable of pumping a wide range of clean, low viscosity, or slightly contaminated fluids with ease.
• Versatile impeller options available: closed or semi-open for tailored performance.
• Back pull-out design for swift and effortless maintenance.
• Handles fluid temperatures up to an impressive 175°C.
• Equipped with a heavy-duty shaft that remains untouched by fluid contact, ensuring longevity.
• Comes with an option for an external seal cooling system to enhance operational efficiency.
• Features independent pump and motor shafts for enhanced reliability.
• Available in materials like cast iron, 316 stainless steel, duplex stainless steel, bronze, among others upon request.
• Suction and discharge flanges align with EN 1092-2 / PN 16, and for steel/stainless steel casings, EN 1092-1 / PN 16.
• Offers gland packing or the option for single, double, and cartridge mechanical seals.
• Compatible with three-phase motors operating at 50Hz/60Hz, with IP55 as standard protection.
• ATEX-certified version available upon request for enhanced safety standards.
• Independent certification can be provided upon request, ensuring conformity with top standards.
• Manufactured in strict accordance with EN 22858 / ISO 2858 standards for guaranteed quality.
• Designed for low NPSH, ensuring optimal performance even in challenging conditions.
• Enables assembly without alignment, simplifying installation and setup.
• All impellers are meticulously balanced according to ISO 1940 class 6.3 for superior stability.
• Long coupled with a robust baseplate for secure and stable operation.
• Option to install an API Seal in accordance with API682, enhancing operational safety and reliability.
• Features oil-lubricated ball bearings for smooth, efficient, and reliable performance.
| 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 equipped with renowned brand bearings, delivering extraordinary durability and reliability even in the toughest of environments, ensuring a prolonged lifespan for all of our pump products.
To effectively balance axial thrust, most impellers feature wear rings at both the front and back, complemented by a balance hole on the back shroud. For pumps with minimal axial thrust, the design is streamlined, eliminating the need for rear wear rings and balance holes.
The high-precision casting of our impellers guarantees superior performance and is available in materials such as cast iron, stainless steel, and bronze, catering to a variety of application needs.
Our systems are categorized into two principal groups:
1) "Flush" - This method introduces a clean, cool liquid into the seal chamber, optimizing the operational environment. A secondary, smaller port, typically oriented downward, facilitates leakage observation or serves as a vent.
2) "Barrier or Buffer" for dual seals - By supplying a secondary fluid to the space between two mechanical seals, this system prevents ambient air from interacting with the pumped fluid, enhances seal cooling, and bolsters overall safety.
It's important to note that not all mechanical seals require specialized external flush setups, allowing for versatile and adaptable configurations.
Flexible Couplings
Flexible couplings, unlike their rigid counterparts, are designed to accommodate movement such as vibrations and thermal expansions without sustaining damage. They are ideal for applications where drive and pump shafts are slightly misaligned. These couplings also effectively absorb vibrations, minimizing operating noise, though their complex design incurs higher costs. Yet, their ability to protect shafts and bearings from damage ensures significant maintenance savings over time.
Semhai's API standard chemical pumps feature API 671 Standard Disc Couplings, a testament to quality and performance.
With lower reaction loads and enhanced balancing quality, these couplings outperform standard ones, significantly boosting the efficiency and effectiveness 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 |
Professional Cooperation Agencies
Shanghai Semhai Pump Co., Ltd. stands as a beacon of excellence by forging enduring partnerships with a multitude of prestigious domestic pump-testing institutions. These collaborations ensure that our End-Suction Pull-Back Pump with Cooling System for Petroleum Applications meets the highest standards.
National Quality Supervision and Inspection Center of Industrial Pumps, located in Tiexi District, Shengyang City,
Irrigation Machinery Products Quality Inspection Center of Machinery Industrial, situated in Zhenjiang City,
Ministry of Agriculture, Water Pump Quality Supervision and Testing Center, based in Chongqing City,
Shanghai Mechanical and Electrical Products Quality Inspection Center, located in the vibrant hub of Shanghai City, among others.
Audited Supplier 
){kind=link}