China Acid Cooler manufacturer
Jiangsu Carpe Diem Ocean Equipment Co., Ltd.
Jiangsu Carpe Diem Ocean Equipment Co., Ltd.
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Jiangsu Carpe Diem Ocean Equipment Co., Ltd.

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Jiangsu Carpe Diem Ocean Equipment Co., Ltd.

City: nanjing

Country/Region:china

Tel:86-025-57719575

Contact Person:
Mr.Leonard Chang View Contact Details

Jiangsu Carpe Diem Ocean Equipment Co., Ltd.

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  Jiangsu Carpe Diem Ocean Equipment Co., Ltd. is headquartered in the Li Shui International Enterprise R&D Park in Nanjing — a historic capital known as the “Ancient City of Six Dynasties.” The facility spans 17,000 square meters, including 8,000 square meters dedicated to workshop operations. As a high-tech enterprise, the company integrates scientific R&D, precision manufacturing, and engineering services into a streamlined operation.

  Our core business includes the design and manufacture of anodic protection equipment, non-ferrous metal processing systems, and complete ammonium sulfate production lines. In 2019, the company achieved sales of nearly RMB 60 million, with export sales to clients worldwide reaching USD 300,000.

A Leader in China’s Sulfuric Acid Equipment Industry
✓ Over 8 years of expertise in corrosion-resistant technology
✓ Advanced analysis software to ensure equipment safety and efficiency
✓ German-imported ETIME automatic argon arc welding machines for precision tube-to-tube sheet welding
✓ Hydraulic expanding machines used in place of traditional mechanical expansion for superior integrity
✓ Equipped with eddy current and ultrasonic flaw detectors for stringent quality inspection
Company Information
Basic Information
Company Name:Jiangsu Carpe Diem Ocean Equipment Co., Ltd.
Business Type:Manufacturer,Exporter
Brands:Carpe Diem
Employee Number:>50
Factory Location:Nanyou Mansion, #66 Xinmofan Road, Gulou District, Nanjing, China
Trade & Market
Company slogan:Jiangsu Carpe Diem Ocean Equipment Co., Ltd.
OEM Overview:

Production Line Introduction for Anodically Protected Sulfuric Acid Coolers (OEM/ODM Available)

This production line specializes in the automated, precision manufacturing of anodically protected shell-and-tube sulfuric acid coolers, core heat-exchange equipment for sulfuric acid plants, chemical processing, and acid recovery systems. It integrates material forming, precision welding, corrosion protection assembly, anodic protection system integration, pressure testing, and intelligent quality inspection to deliver high-reliability coolers for high-temperature, high-concentration sulfuric acid environments. We fully support OEM and ODM cooperation models to meet the personalized needs of global customers.

Core Production Flow

  1. Material Preparation & Forming Raw materials include 316L, 904L, 254SMO, and other high-alloy stainless steels resistant to concentrated sulfuric acid. The line performs CNC cutting, rolling, and stamping to produce shells, tube sheets, heat exchange tubes, and headers, ensuring dimensional accuracy and surface smoothness. For OEM/ODM orders, we can customize material selection according to customer requirements for acid concentration, temperature, and working pressure.
  2. Precision Welding & Assembly Automated orbital welding and argon-shielded welding are used for tube-to-tube sheet connections and shell closure. Welds undergo 100% radiographic or ultrasonic testing to eliminate defects. The structure is assembled with strict alignment to guarantee flow uniformity and mechanical stability. ODM solutions support structural optimization based on customer installation space and heat exchange efficiency requirements.
  3. Anodic Protection System Integration Cathodes, reference electrodes (Hg/HgSO₄ type), and potential sensors are installed in designated positions. Wiring and sealing are completed to connect with the constant potential rectifier, forming a closed-loop anodic protection (AP) system that maintains passivation in corrosive acid. We provide OEM customization of AP system parameters and can integrate customer-specified components for ODM projects.
  4. Pressure Testing & Leak Detection Hydrostatic and pneumatic pressure tests are conducted at 1.25–1.5 times design pressure to verify strength and tightness. Helium leak detection ensures zero leakage in acid and water circuits, critical for safe operation. Testing standards can be customized according to customer industry norms or international standards (e.g., ASME, GB) for OEM/ODM orders.
  5. Passivation & AP Commissioning The wetted surfaces are chemically passivated. The AP control system is calibrated to set and stabilize the passive potential, forming a dense, protective oxide film that drastically reduces corrosion rates. Commissioning parameters can be adjusted to match the specific working conditions of customer projects in ODM cooperation.
  6. Finishing & Performance Testing External painting, insulation, and labeling are applied. Final testing includes heat exchange efficiency, pressure drop, and long-duration AP monitoring. Only fully qualified units are packaged and delivered. OEM orders support custom labeling, packaging, and compliance with customer brand standards.

Key Advantages of the Production Line

  • Corrosion Resistance: The integrated anodic protection system extends service life and reduces iron ion contamination of sulfuric acid.
  • High Efficiency: Optimized flow design and precision manufacturing boost heat transfer performance while lowering energy consumption.
  • Stable Quality: Full-process digital control and non-destructive testing ensure consistency for heavy-duty industrial use.
  • Wide Adaptability: Products suit various concentrations (93%–98%) and temperatures of sulfuric acid, matching drying, absorption, and circulation cooling processes.
  • Flexible OEM/ODM Capabilities: We offer one-stop customization from product design, material selection, and structural optimization to branding and packaging, tailoring solutions to meet customer-specific technical requirements, industry standards, and market demands.

OEM/ODM Service Highlights

We have rich experience in OEM/ODM cooperation with global chemical equipment distributors, sulfuric acid plants, and engineering companies. Our professional R&D and engineering team can:
  • Customize product specifications (size, heat exchange area, pressure rating) based on customer drawings or technical parameters;
  • Integrate customer-specified components (e.g., control systems, connectors) into the anodic protection and cooling system;
  • Provide OEM production with customer brand labeling, packaging, and documentation (user manual, test report);
  • Develop ODM solutions for special working conditions (e.g., ultra-high temperature, high-concentration acid, compact installation space);
  • Offer technical support and after-sales service for OEM/ODM products to ensure stable operation.
This line combines precision manufacturing with flexible
Production Line:

Production Line Introduction for Anodically Protected Sulfuric Acid Coolers

 
This production line specializes in the automated, precision manufacturing of anodically protected shell-and-tube sulfuric acid coolers, core heat-exchange equipment for sulfuric acid plants, chemical processing, and acid recovery systems. It integrates material forming, precision welding, corrosion protection assembly, anodic protection system integration, pressure testing, and intelligent quality inspection to deliver high-reliability coolers for high-temperature, high-concentration sulfuric acid environments.

Core Production Flow

 
  1. Material Preparation & Forming
     
    Raw materials include 316L, 904L, 254SMO, and other high-alloy stainless steels resistant to concentrated sulfuric acid. The line performs CNC cutting, rolling, and stamping to produce shells, tube sheets, heat exchange tubes, and headers, ensuring dimensional accuracy and surface smoothness.
     
  2. Precision Welding & Assembly
     
    Automated orbital welding and argon-shielded welding are used for tube-to-tube sheet connections and shell closure. Welds undergo 100% radiographic or ultrasonic testing to eliminate defects. The structure is assembled with strict alignment to guarantee flow uniformity and mechanical stability.
     
  3. Anodic Protection System Integration
     
    Cathodes, reference electrodes (Hg/HgSO₄ type), and potential sensors are installed in designated positions. Wiring and sealing are completed to connect with the constant potential rectifier, forming a closed-loop anodic protection (AP) system that maintains passivation in corrosive acid.
     
  4. Pressure Testing & Leak Detection
     
    Hydrostatic and pneumatic pressure tests are conducted at 1.25–1.5 times design pressure to verify strength and tightness. Helium leak detection ensures zero leakage in acid and water circuits, critical for safe operation.
     
  5. Passivation & AP Commissioning
     
    The wetted surfaces are chemically passivated. The AP control system is calibrated to set and stabilize the passive potential, forming a dense, protective oxide film that drastically reduces corrosion rates.
     
  6. Finishing & Performance Testing
     
    External painting, insulation, and labeling are applied. Final testing includes heat exchange efficiency, pressure drop, and long-duration AP monitoring. Only fully qualified units are packaged and delivered.
     
 

Key Advantages of the Production Line

 
  • Corrosion Resistance: The integrated anodic protection system extends service life and reduces iron ion contamination of sulfuric acid.
  • High Efficiency: Optimized flow design and precision manufacturing boost heat transfer performance while lowering energy consumption.
  • Stable Quality: Full-process digital control and non-destructive testing ensure consistency for heavy-duty industrial use.
  • Wide Adaptability: Products suit various concentrations (93%–98%) and temperatures of sulfuric acid, matching drying, absorption, and circulation cooling processes.
 
This line provides reliable, long-life anodically protected sulfuric acid coolers to support safe, efficient, and low-maintenance operation in sulfuric acid and chemical industries.
About quality management:

Overview of Non-Destructive Testing for Anodic Protection Acid Coolers

Anodic protection acid coolers are critical equipment widely used in the sulfuric acid production and other chemical industries, mainly responsible for cooling concentrated sulfuric acid and other corrosive media. Due to their long-term operation under harsh conditions such as high temperature, high pressure, and strong corrosion, the integrity and safety of anodic protection acid coolers are directly related to the stability of the entire production process and the safety of personnel and equipment. Non-Destructive Testing (NDT) is an essential technical means to ensure the manufacturing quality, in-service safety, and extend the service life of anodic protection acid coolers, which can detect defects such as cracks, corrosion, and welding flaws without damaging the equipment structure. In China, the NDT work of anodic protection acid coolers must strictly comply with relevant national energy industry standards, among which the NB/T 47013 series standards and NB/T 47045-2015 are the core guidelines.
The NB/T 47013 series standards, titled "Nondestructive Testing of Pressure Equipments", are a set of comprehensive and systematic standards that regulate various NDT methods for pressure equipment, including anodic protection acid coolers. Specifically, each part involved in the testing of anodic protection acid coolers undertakes distinct and important roles:
NB/T 47013.1-2015 "Nondestructive Testing of Pressure Equipments -- Part 1: General Requirements" specifies the general requirements and application principles of all NDT methods involved in this standard series, including radiographic testing, ultrasonic testing, magnetic particle testing, and others. It serves as the fundamental guideline for the entire NDT process of anodic protection acid coolers, covering the basic requirements for testing personnel, equipment, materials, testing procedures, and result evaluation, ensuring the standardization and uniformity of the NDT work.
NB/T 47013.2-2015 "Nondestructive Testing of Pressure Equipments -- Part 2: Radiographic Testing" regulates the technical requirements, testing procedures, and result evaluation methods of radiographic testing (RT) for pressure equipment. For anodic protection acid coolers, this standard is mainly used to detect internal discontinuities such as welding defects, internal cracks, and voids in the shell, tube sheet, and heat exchange tube components, providing clear criteria for judging the quality of internal structures.
NB/T 47013.3-2015 "Nondestructive Testing of Pressure Equipments -- Part 3: Ultrasonic Testing" specifies the technical details of ultrasonic testing (UT) for pressure equipment. UT is widely used in the thickness measurement of the shell and heat exchange tubes of anodic protection acid coolers, as well as the detection of internal and surface-subsurface cracks, corrosion pits, and welding defects. It has the advantages of high detection efficiency, high sensitivity, and no radiation pollution, and is one of the most commonly used NDT methods in the inspection of anodic protection acid coolers.
NB/T 47013.4-2015 "Nondestructive Testing of Pressure Equipments -- Part 4: Magnetic Particle Testing" focuses on magnetic particle testing (MT) technology. It is mainly used to detect surface and near-surface discontinuities in ferromagnetic components of anodic protection acid coolers, such as surface cracks, welding seams, and fatigue cracks caused by long-term operation. By magnetizing the component and applying ferromagnetic particles, defects can be clearly displayed, which is crucial for ensuring the surface integrity of the equipment.
NB/T 47013.5-2015 "Nondestructive Testing of Pressure Equipments -- Part 5: Penetrant Testing" regulates penetrant testing (PT) methods. PT is suitable for detecting surface open defects (such as surface cracks, pores, and gaps) in non-ferromagnetic and ferromagnetic components of anodic protection acid coolers, especially for components with complex shapes that are difficult to detect by MT. It has the characteristics of simple operation, low cost, and wide applicability, and is often used as a supplementary method for surface defect detection.
NB/T 47013.6-2015 "Nondestructive Testing of Pressure Equipments -- Part 6: Eddy Current Testing" specifies eddy current testing (ET) technology. ET is mainly used to detect surface and near-surface defects in conductive components of anodic protection acid coolers, such as heat exchange tubes and connecting pipes. It is particularly suitable for the rapid inspection of thin-walled components and can also be used to evaluate the thickness of the passivation film and the degree of surface corrosion, which is closely related to the anodic protection effect of the equipment.
NB/T 47013.10-2015 "Nondestructive Testing of Pressure Equipments -- Part 10: Ultrasonic Time of Flight Diffraction Technique" regulates the ultrasonic time-of-flight diffraction (TOFD) technique. This technique has high accuracy in detecting the height and size of internal cracks in thick-walled components of anodic protection acid coolers (such as the shell and tube sheet), and can provide more accurate defect size data, which is important for evaluating the safety level of the equipment and formulating maintenance plans.
NB/T 47013.11-2015 "Nondestructive Testing of Pressure Equipments -- Part 11: X-ray Digital Radioscopic Testing" focuses on X-ray digital radioscopic testing technology. Compared with traditional RT, this method has the advantages of fast imaging, high image resolution, and convenient data storage and analysis. It is suitable for the rapid detection of internal defects in key components of anodic protection acid coolers, improving the efficiency and accuracy of NDT work.
NB/T 47013.12-2015 "Nondestructive Testing of Pressure Equipments -- Part 12: Magnetic Flux Leakage Testing" specifies magnetic flux leakage testing (MFL) technology. MFL is mainly used to detect surface and near-surface corrosion, wear, and cracks in ferromagnetic components of anodic protection acid coolers, especially for the inspection of large-area components such as the shell. It has the characteristics of high detection efficiency and strong adaptability to harsh environments.
NB/T 47013.13-2015 "Nondestructive Testing of Pressure Equipments -- Part 13: Pulsed Eddy Current Testing" regulates pulsed eddy current testing (PECT) technology. PECT has strong penetration ability and is suitable for detecting internal corrosion and thickness reduction of thick-walled components and components with coatings in anodic protection acid coolers. It can effectively detect defects that are difficult to find by traditional ET, providing a more comprehensive guarantee for the integrity of the equipment.
In addition to the NB/T 47013 series standards, NB/T 47045-2015 "Brazed Plate Heat Exchangers" also plays an important guiding role in the NDT of anodic protection acid coolers. This standard specifies the technical requirements for the design, material, manufacturing, inspection, and acceptance of brazed plate heat exchangers, which are widely used as the core heat exchange components of anodic protection acid coolers. It clearly stipulates the NDT methods and acceptance criteria for brazed seams and key components of brazed plate heat exchangers, and references relevant parts of the NB/T 47013 series standards to ensure that the manufacturing and inspection of brazed plate acid coolers meet the safety and quality requirements. This standard is applicable to brazed plate heat exchangers (including anodic protection type) operating at a temperature of -196℃ to 225℃ and a pressure of -0.1MPa to 14MPa.
In the actual NDT work of anodic protection acid coolers, it is necessary to select appropriate NDT methods according to the structure, material, operating conditions, and potential defect types of the equipment, and strictly implement the requirements of the above-mentioned standards. The combination of multiple NDT methods can achieve comprehensive and accurate detection of equipment defects, avoid missed detection and misjudgment. At the same time, the NDT results should be recorded and evaluated in accordance with the standards to provide a scientific basis for the quality evaluation, in-service monitoring, maintenance, and scrapping of anodic protection acid coolers. By strictly complying with these standards, the safety and reliability of anodic protection acid coolers can be effectively guaranteed, and the occurrence of equipment failures and safety accidents can be prevented, thus promoting the stable and efficient operation of the chemical industry and other related fields.
Services:

R&D Capabilities

Our R&D team is composed of senior engineers with over 10 years of experience in chemical heat exchange equipment and anodic protection technology, focusing on technological innovation, product optimization, and customized solution development to address the evolving needs of the sulfuric acid and chemical industries.

R&D Focus Areas

  • Anodic Protection Technology Innovation: Continuously optimize the design of AP systems, including reference electrode performance, constant potential rectifier stability, and passivation process parameters, to enhance corrosion resistance and extend product service life in extreme working conditions (high temperature, high-concentration sulfuric acid).
  • Material Research & Application: Collaborate with domestic and foreign material suppliers to test and apply new high-alloy materials, improving product wear resistance, corrosion resistance, and cost-effectiveness while expanding adaptability to different acid concentrations and working environments.
  • Structural Optimization: Use 3D modeling and fluid dynamics simulation to optimize the structure of heat exchange tubes, tube sheets, and shells, improving heat transfer efficiency, reducing pressure drop, and adapting to compact installation spaces for ODM projects.
  • Intelligent Upgrade: Integrate intelligent monitoring and control technologies into AP systems, developing remote monitoring, fault early warning, and automatic parameter adjustment functions to reduce manual operation and improve operational safety and stability.

R&D Support & Cooperation

We have established a complete R&D test center, equipped with professional testing equipment for material performance, corrosion resistance, heat exchange efficiency, and AP system stability, ensuring that all R&D achievements meet industrial application standards. For OEM/ODM customers, our R&D team provides full-process technical support, from demand analysis and program design to prototype testing and mass production, ensuring customized products meet customer expectations and industry norms.
Our Team:

R&D Team Structure of Jiangsu Carpe Diem Ocean Equipment Co., Ltd.

The R&D team of Jiangsu Carpe Diem Ocean Equipment Co., Ltd. is composed of senior professionals with rich experience, solid professional knowledge and outstanding industry influence, providing strong technical support for the company's development. The specific structure and personnel information are as follows:

1. Chang Le

  • Position: General Manager
  • Education Background: Master’s Degree in Chemical Process Machinery, Nanjing Tech University
  • Responsibilities: In charge of team building and overall management of the R&D team, coordinating the progress of various R&D projects and ensuring the efficient operation of the team.
  • Qualifications: Senior Engineer (SE); Pressure Vessel Analysis & Design Engineer

2. Zhang Bin

  • Position: Associate Professor, Changshu Institute of Technology; R&D Core Member of the Company
  • Responsibilities: Focus on the research and development of sealing technology for pressure vessels, and provide technical guidance for the optimization and innovation of related products.
  • Honors: Young and Middle-aged Academic Leader of the "Qinglan Project" in Jiangsu Higher Education Institutions; Recipient of the "Six Talent Peaks" Program in Jiangsu Province

3. Dong Jinshan

  • Position: Chief Technical Advisor for Vessel Technology
  • Academic Titles & Positions: Professor, Nanjing Tech University; Director of the Department of Process Equipment and Control Engineering, Nanjing Tech University; Leader of the Advanced Technology Team for Design and Manufacturing of High-end Process Equipment; Member of the Pressure Vessel Committee of the Chinese Mechanical Engineering Society (CMES)

4. Li Tao

  • Position: Director of Ultra-high Pressure Vessels
  • Academic Title: Associate Professor, Tianjin University of Technology
  • Professional Experience: Participated in the formulation of national standards, including GB/T 34019-2017 *Ultra-high Pressure Vessels* and GB/T 4732-2024 *Analysis Design of Pressure Vessels
Factory Information
Market name:South America,Eastern Asia,Southeast Asia,Middle East,Africa
Contact Person:Mr.Leonard Chang
Contact Phone:86-025-57719575
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