Views: 5000 Author: JUSH Marketing Department Publish Time: 2026-01-20 Origin: Shanghai JUSH Pump
With its compact structure, high efficiency and energy saving, and stable operation, the CDL/CDLF vertical multistage centrifugal pump has become an "all-rounder" in the fluid transportation field, thanks to its dual-series layout of "cast iron for clean water + stainless steel for corrosion resistance". From secondary water supply in urban high-rise buildings to media circulation in industrial workshops, and purification transportation in water treatment projects, its presence is felt in numerous scenarios. This article analyzes the selection logic, operational performance, and core value of CDL/CDLF pumps under different operating conditions through five typical application cases, providing practical reference for users in various industries.
Note: The CDL series is made of cast iron, suitable for non-corrosive, clean water conditions, offering excellent cost performance; the CDLF series is made of 304/316L stainless steel, with corrosion resistance and sanitary properties suitable for complex media. The two series can be combined as needed to cover most fluid transportation requirements.
Case Study 1: Secondary Water Supply for a High-Rise Building – CDL Variable Frequency Drive Ensures Constant Pressure and Stable Supply
Project Background:
A 38-story office building in a core business district of a city, with a total height of 156 meters, needed to solve its secondary water supply problem. The project required stable water pressure (terminal pressure 0.3-0.4 MPa), low noise (machine room noise ≤75dB), controllable energy consumption, and adaptability to peak and off-peak flow fluctuations (peak flow 80 m³/h, off-peak flow 20 m³/h), with water quality meeting drinking water standards.
Selection and Solution:
Based on the operational requirements, three CDL100-20 vertical multistage centrifugal pumps (2 in operation, 1 on standby) were selected, paired with a variable frequency control system. Selection Logic: Office building water supply requires clean water; CDL cast iron is a cost-effective choice. The pump has a 200m head and a flow rate range of 60-100m³/h, covering peak water demand. The variable frequency design automatically adjusts the motor speed according to flow fluctuations, avoiding energy waste from constant speed operation. The vertical structure occupies only 1/3 the space of a horizontal pump, making it suitable for confined computer rooms.
Operating Results:
After commissioning, the equipment provides 24-hour constant pressure water supply with terminal water pressure fluctuations ≤±3%, fully meeting the office water and fire safety reserve needs of the office building. The variable frequency system reduces energy consumption by more than 30% during off-peak hours, saving nearly 80,000 RMB in electricity costs annually. Operating noise is controlled below 72dB, with no significant interference from the adjacent office area. The equipment has operated continuously for 3 years without failure, requiring only periodic replacement of lubricating grease and seals, resulting in low maintenance costs and completely solving the pain points of insufficient water pressure and peak-hour water supply interruptions in high-rise buildings.
Case Study 2: Weak Acid and Alkali Media Transportation in a Chemical Workshop – CDLF-316L Model Resists Corrosion
Project Background:
A fine chemical company's production workshop needs to transport 10% concentration sulfuric acid and sodium hydroxide weak acid and alkali solutions. The medium temperature is 50-60℃, the flow rate requirement is 40 m³/h, and the head is 80 m. The operating conditions require a leak-free pump body, strong corrosion resistance, and prevention of medium contamination, meeting the safety operation standards of the chemical industry.
Selection and Solution:
Two CDLF-42-16 vertical multistage centrifugal pumps were selected (one in operation and one on standby). The core components are made of 316L stainless steel, equipped with fluororubber mechanical seals. Selection Logic: Weak acid and alkali media are corrosive. Compared to 304 stainless steel, 316L stainless steel contains molybdenum, which enhances corrosion resistance and effectively resists acid and alkali corrosion. The fluororubber seals are suitable for medium temperatures of 50-60℃, preventing leakage due to seal failure. The pump body's flow parts are precision polished to reduce media residue and avoid cross-contamination. Simultaneously, inlet and outlet filters and pressure gauges are installed to monitor operating status in real time and ensure safe conveying.
Operating Results:
The equipment has operated continuously and stably for two years without pump body corrosion or media leakage. No pitting or cracking has been observed in the flow-through components, and the conveying efficiency has consistently remained above 85%. The seals have a service life of up to 8 months, three times longer than ordinary seals, significantly reducing maintenance frequency and costs. The equipment is suitable for continuous production needs in workshops, with no downtime or failures, providing reliable protection for the circulation of chemical media and fully complying with industry safety and environmental protection requirements.
Case Study 3: Municipal Wastewater Treatment Plant Clean Water Reuse – CDL+CDLF Combination Suitable for Multiple Stages
Project Background:
A municipal wastewater treatment plant has a daily treatment capacity of 50,000 tons and needs to reuse the purified water (for plant landscaping and equipment flushing) while also handling the chemical delivery for sludge dewatering. The clean water reuse stage uses clean water at a flow rate of 120 m³/h and a head of 60 m; the chemical delivery stage uses a slightly corrosive polyacrylamide solution at a flow rate of 30 m³/h and a head of 100 m.
Selection and Solution:
A "CDL+CDLF" combination solution is adopted: Two CDL-125-12 centrifugal pumps (one in operation and one on standby) are used for the clean water reuse stage. The cast iron construction is suitable for clean water conditions and meets the high flow rate requirements. One CDLF32-20 centrifugal pump is used for the chemical delivery stage. The 304 stainless steel construction resists slight corrosion from chemicals and precisely matches the low flow rate and high head requirements. Simultaneously, stainless steel filters are installed on the CDLF pumps to prevent impurities in the chemicals from entering the pump body and wearing down the impeller, thus extending the equipment's lifespan.
Operating Results:
The combined solution achieves precise adaptation to different stages, with a clean water reuse and delivery efficiency of 88%. Chemical delivery is leak-free and corrosion-free, ensuring the continuous operation of the wastewater treatment plant. The high cost-effectiveness of the CDL pump complements the corrosion resistance of the CDLF pump, saving 20% in initial procurement costs compared to a single-material pump solution. After the equipment is put into operation, it can reuse 30,000 tons of clean water daily, saving over 150,000 yuan in tap water costs annually, demonstrating both economic benefits and environmental value.
Case Study 4: Dairy Product Conveying in a Food Processing Plant – CDLF304 Model Meets Hygiene Requirements
Project Background:
A large dairy company's production line needs to convey food-grade media such as milk and yogurt, as well as warm water (60-70℃) for production line cleaning. Operating requirements include no material leaching, easy cleaning, no dead corners, compliance with HACCP hygiene standards in the food industry, a flow rate of 50 m³/h, and a head of 70 m.
Selection and Solution:
Two CDLF-50-14 vertical multistage centrifugal pumps were selected. Core components are made of 304 food-grade stainless steel, equipped with leak-free mechanical seals. The pump body inner wall is mirror-polished (roughness Ra≤0.8μm). Selection Logic: 304 stainless steel prevents impurity leaching, meeting food-grade hygiene requirements; the mirror-polished inner wall reduces media residue, facilitates cleaning and disinfection, and prevents bacterial growth; the temperature-resistant seals are suitable for conveying 60-70℃ warm water, and the leak-free design prevents media contamination.
Operational Performance:
The equipment fully complies with food processing hygiene standards, producing no media contamination or odor during transport. Testing showed that the total bacterial count and heavy metal content of dairy products met national standards. The pump body is easy to disassemble and clean, adapting to the daily cleaning and disinfection needs of the production line. Operating noise is low (≤70dB), without affecting the workshop production environment. The equipment has operated continuously for one year without failure, and its hygiene performance and stability have been recognized by the company.
Case Study 5: Agricultural Greenhouse Irrigation and Seawater Desalination Auxiliary Water Supply – CDL and CDLF Adapted to Extreme Working Conditions
Project Background:
An agricultural industrial park in a coastal area includes a 200-mu (approximately 13.3 hectares) vegetable greenhouse irrigation area and a small-scale seawater desalination experimental area. Greenhouse irrigation requires the delivery of river water (clean water with a small amount of sediment), at a flow rate of 150 m³/h and a head of 50 m. The seawater desalination experimental area requires the delivery of seawater with a salinity of 3.5% (auxiliary water supply), at a flow rate of 60 m³/h and a head of 90 m, requiring pumps resistant to salt corrosion.
Pump Selection and Solution:
For the irrigation section, two CDL-150-10 centrifugal pumps were selected. Made of wear-resistant cast iron, they offer high cost-effectiveness and are equipped with 1mm precision filters to prevent sediment from entering the pump body and wearing the impeller. For the seawater auxiliary water supply, one CDLF-65-18 centrifugal pump was selected. Made of 316L stainless steel, it resists seawater salt corrosion and prevents pitting and leakage. Meanwhile, an anti-corrosion coating is added to the CDLF pump to further enhance its corrosion resistance and adapt it to the humid coastal environment.
Operating Results:
The equipment adapts to various extreme working conditions. In irrigation, there are no impeller wear or pipe blockage issues, ensuring uniform water supply to greenhouses and improving crop irrigation efficiency by 20%. In seawater transportation, there is no corrosion or leakage, and operating efficiency remains above 84%. The CDL pump is suitable for clean water containing a small amount of impurities, while the CDLF pump resists seawater corrosion. Together, they meet the diverse needs of the industrial park, saving 40% in procurement costs compared to imported corrosion-resistant pump solutions. Subsequent maintenance only requires periodic filter cleaning and lubrication, making operation and maintenance convenient.
Case Summary: Core Logic and All-Round Value of CDL/CDLF Pump Selection
As seen in the above case, the all-round adaptability of CDL/CDLF vertical multistage centrifugal pumps stems from their product characteristics of "material segmentation + precise performance matching." Their core selection logic can be summarized in three points: First, select materials based on media characteristics: choose CDL cast iron for clean water and non-corrosive conditions, and CDLF stainless steel for corrosive, sanitary, and salty media (304 for mildly corrosive media, 316L for strongly corrosive media); second, select models based on flow rate and head requirements, and choose variable frequency models to improve energy efficiency and stability when considering fluctuations in operating conditions; third, match components according to specific scenarios, adding filters, anti-corrosion gaskets, vibration damping pads, and other accessories to extend equipment life and mitigate failure risks.
Whether in urban high-rise buildings, industrial workshops, or water treatment, food processing, and agricultural irrigation scenarios, CDL/CDLF pumps can provide customized fluid transport solutions with their advantages of high efficiency, energy saving, stable operation, and strong adaptability. This reduces initial procurement and subsequent operation and maintenance costs while ensuring the continuity of production operations, making them the preferred equipment for fluid transport in various industries.