Low Pressure Drop Design Anodic Protection Sulfuric Acid Cooler CD-AP-55 55m²

The Carpe Diem CD-AP-55 Low Pressure Drop Design Anodic Protection Sulfuric Acid Cooler addresses a critical need in small to medium acid processing operations where available pumping head is limited but reliable corrosion protection remains essential. With a carefully engineered 55-square-meter heat exchange surface area utilizing 16-millimeter diameter tubes with a 1.5-millimeter wall thickness and 5,000-millimeter effective length, this compact unit processes 22,000 kilograms per hour of 93.5 percent sulfuric acid while reducing the temperature from 60 degrees Celsius to 35 degrees Celsius with minimal hydraulic resistance across the shell side. The 304L stainless steel shell with a slim 480-millimeter diameter and the 316L stainless steel tube bundle are configured with an optimized tube layout, generous baffle spacing, and streamlined nozzle geometry that collectively reduces the shell-side pressure drop to less than 25 kilopascals at design flow conditions, enabling installation in gravity-fed acid circulation systems or retrofit applications where existing pumps have limited additional head capacity. At just 3,200 kilograms total assembly weight and occupying a footprint of only 920 millimeters wide by 6,700 millimeters long, the CD-AP-55 is the most compact anodic protection cooler in the Carpe Diem product line, specifically designed for pilot plants, small-capacity acid regeneration units, and laboratory-scale continuous acid processing loops where larger equipment would be both physically and economically impractical.

• Ultra-Low Pressure Drop Design: The carefully engineered shell-side flow path featuring reduced tube count per crossflow row, increased baffle spacing ratios, and streamlined inlet and outlet nozzle transitions achieves a total shell-side pressure drop below 25 kilopascals at design flow rate, enabling operation with low-head centrifugal pumps or gravity-fed acid circulation systems without requiring costly pump upgrades.
• Compact Space-Saving Footprint: The 480-millimeter shell diameter combined with the 920-millimeter support base width and 3,200-kilogram lightweight assembly allows installation in laboratory environments, pilot plant skids, and congested brownfield chemical plants where access restrictions prevent the use of larger conventional acid cooling equipment.
• Small-Diameter Tube Configuration: The 16-millimeter diameter tubes with 1.5-millimeter wall thickness provide an exceptional surface-area-to-volume ratio that maximizes heat transfer within the compact 55-square-meter envelope while the thin-wall construction minimizes material costs without compromising corrosion allowance for the design service life.
• Full Anodic Protection Coverage: Despite its compact dimensions, the CD-AP-55 incorporates the same industrial-grade potentiostatic anodic protection system used in larger Carpe Diem cooler models, with dedicated reference electrodes and auxiliary cathodes sized and positioned through finite element current distribution modeling to ensure complete passivation of all acid-wetted 304L and 316L surfaces.
• Precision Low-Flow Temperature Control: The tube-side flow path is designed for cooling water flow rates as low as 15 cubic meters per hour while maintaining turbulent flow conditions that prevent fouling deposition, ensuring consistent heat transfer performance and outlet acid temperature stability even during extended low-demand operational periods.
• Rapid Deployment Skid Package: The complete cooler assembly including the anodic protection controller, local instrumentation, and interconnecting cabling is pre-mounted on a single structural steel base frame with integral fork pockets and lifting eyes, reducing on-site installation time to less than two working days after mechanical and electrical utility connections are established.
• Versatile Connection Flexibility: All process nozzles are equipped with lap-joint stub ends and loose backing flanges conforming to both ANSI B16.5 Class 150 and HG/T 20592 PN16 dimensional standards, allowing connection to either imperial or metric piping systems without requiring field modifications or adapter spools.

The CD-AP-55 low pressure drop anodic protection sulfuric acid cooler is purpose-built for pilot-scale and small-capacity acid processing operations where the combination of compact dimensions, low hydraulic resistance, and reliable corrosion protection creates a unique value proposition unmatched by conventional cooling equipment. Research and development laboratories operating continuous sulfuric acid test loops for catalyst development, materials testing, and process optimization studies rely on the CD-AP-55 for precise temperature control without the excessive pressure drop that would require high-head positive displacement pumps incompatible with small-scale acid handling systems. Small-capacity spent sulfuric acid regeneration units processing 5 to 15 metric tons per day of alkylation acid from petroleum refineries or sulfonation acid from detergent manufacturing facilities utilize this cooler for the regenerated acid cooling duty where the low pressure drop characteristic minimizes the pumping energy penalty in the regeneration loop. University chemical engineering departments and industrial training centers employ the CD-AP-55 as a teaching and demonstration platform for anodic protection technology, benefiting from the transparent controller interface and comprehensive instrumentation package that allows students and trainees to observe the relationship between applied potential, passive current density, and corrosion protection effectiveness in real time. The cooler is also finding increasing application in small-scale lithium-ion battery recycling operations where sulfuric acid leaching of cathode materials requires precise temperature control of the leach solution, and in pharmaceutical intermediate manufacturing where high-purity sulfuric acid is used as a reagent and must be maintained at low temperatures to prevent side reactions during sensitive synthesis steps.

Every CD-AP-55 anodic protection sulfuric acid cooler manufactured by Carpe Diem undergoes a thorough quality verification program scaled appropriately for the compact equipment size while maintaining the same fundamental quality standards applied to our largest industrial coolers. Incoming 304L and 316L stainless steel materials are verified against mill test certificates for chemical composition, tensile properties, and intergranular corrosion resistance per ASTM A262 Practice E before release to the fabrication shop. All pressure boundary welds on the 480-millimeter diameter shell, including longitudinal seams and circumferential girth welds, receive 100 percent radiographic examination with acceptance criteria in accordance with ASME Section VIII Division 1, while the smaller diameter tube-to-tubesheet joints are individually helium leak tested to a sensitivity of 1 times 10 to the power of minus 5 standard cubic centimeters per second. The completed shell assembly undergoes a hydrostatic pressure test at 1.3 times the design pressure maintained for a minimum of 30 minutes with direct-reading pressure gauge monitoring and visual inspection of all weld seams and joints. The anodic protection system is factory-tested as a complete assembly with simulated electrode inputs to verify controller response, alarm functions, and communication protocol functionality, with a detailed test report included in the quality dossier. For transportation, the pre-assembled skid-mounted unit is protected by an engineered steel shipping frame with integral shock-absorbing mounts that isolate the cooler from transport vibration and impact loads up to 3G acceleration. All external stainless steel surfaces receive a protective coating of removable peelable vinyl film to prevent cosmetic damage during handling and installation, while all flange faces and instrument connections are sealed with protective covers containing vapor-phase corrosion inhibitor sachets. The documentation package delivered with each CD-AP-55 includes full material certification, radiographic examination reports with digital image files, hydrostatic and leak test certificates, anodic protection system factory acceptance test documentation, welding procedure and performance qualification records, and a comprehensive operating manual with step-by-step commissioning and shutdown procedures tailored specifically for small-scale acid cooling applications.