Reliable Sealless Pumps for Metal Plating and Finishing

Sealless Magnetic Drive Pumps: Precision Fluid Handling for Electroplating & Surface Finishing

HIS Pumps and Systems offers a comprehensive portfolio of sealless magnetic drive pumps engineered specifically for the most demanding electroplating, anodizing, and metal finishing environments. Unlike conventional sealed pumps that rely on mechanical seals prone to leakage, our pumps utilize a magnetic coupling that completely eliminates the dynamic shaft seal. The inner magnet assembly is hermetically isolated from the outer drive magnet by a thick, non-magnetic containment shell, creating a truly leak-free containment system. This design is critical when handling the corrosive acids, caustic solutions, and high-purity plating baths found in plating lines, where even a micro-leak can cause catastrophic equipment damage, worker exposure, and costly downtime.

Our range spans from compact centrifugal pumps for small circulation loops to high-flow ANSI dimensional sealless pumps that easily retrofit into existing piping systems. Every pump is constructed from carefully selected non-metallic materials such as polypropylene (PP), polyvinylidene fluoride (PVDF), or ethylene tetrafluoroethylene (ETFE) that withstand the unique chemical cocktails used in chrome plating, nickel plating, zinc plating, and anodizing lines. The magnetic drive technology also provides inherent safeguards against dry running and operator error, while the smooth, vibration-free operation extends bearing life and reduces maintenance frequency. HIS sealless pumps are the definitive choice for facilities that demand zero emissions, maximum reliability, and the longest possible mean time between repairs in harsh acidic and alkaline services.

From drum transfer of concentrated acids to continuous circulation of hot nickel baths and filter press feed, our sealless pump solutions bring unmatched safety, chemical compatibility, and process repeatability. The pumps are available in close-coupled, long-coupled, vertical immersion, and self-priming configurations, ensuring the right hydraulic fit for every plating stage. With the absence of seals, the total cost of ownership drops dramatically as plants eliminate seal replacement, flush water lines, and unplanned outages. This seamless integration with plating chemistry makes HIS the preferred partner for plating job shops and automotive OEM coating lines worldwide.

Critical Challenges in Plating Fluid Handling: Why Sealless Technology Is Non-Negotiable

The electroplating industry presents one of the most aggressive and unforgiving chemical environments in manufacturing. Pump systems are routinely exposed to concentrated sulfuric acid (93-98%), hydrochloric acid (30-37%), chromic acid solutions, cyanide-based plating baths, and strong alkaline cleaners at elevated temperatures often exceeding 180 degree F (82 degree C). A traditional mechanically sealed pump in this service is doomed to frequent failure because the seal faces are continuously attacked by crystallizing salts, abrasive metal particles, and thermal shock. Seal leakage not only releases hazardous fumes and liquids into the workspace but also contaminates the plating solution, leading to surface defects, costly rework, and non-compliance with environmental regulations. The sealless magnetic drive pump solves these issues at the design stage by eliminating the primary leak path entirely.

Beyond leak prevention, the plating industry demands absolutely stable flow characteristics to ensure uniform current distribution and consistent deposit thickness. Pulsation or pressure fluctuations can cause uneven plating, burnt deposits, or poor adhesion. Sealless mag-drive pumps deliver smooth, continuous flow without the micro-pulsations often associated with diaphragm pumps. When combined with variable frequency drives, they offer precise flow control across a wide operating window, essential for reel-to-reel plating, barrel plating, and rack plating where flow must adapt to varying loads. Additionally, the ability to run dry for short periods without immediate damage (thanks to carbon fiber reinforced bearing systems) provides a critical safety net during tank level fluctuations or operator errors, preventing catastrophic pump seizures that can shut down entire production lines.

The move toward zero-liquid-discharge (ZLD) and closed-loop systems in modern plating facilities further reinforces the need for sealless technology. By containing all process fluids within the pump casing and eliminating flush water requirements for mechanical seals, sealless pumps dramatically reduce wastewater volume and treatment costs. They also support compliance with stringent EPA and OSHA standards. Plating operations that switch from sealed to sealless pumps report reductions in hazardous waste disposal fees of up to 40 percent and a marked decrease in workplace chemical exposure incidents. These factors combine to make the sealless magnetic drive pump not just a component upgrade but a strategic asset for any plating line aiming for best-in-class safety, sustainability, and profitability.

Typical Applications in Electroplating, Anodizing & Metal Finishing

HIS sealless pumps serve as the workhorse across virtually every stage of the surface finishing process. From the initial chemical makeup and transfer of raw acids to the final rinsing and waste treatment steps, our magnetic drive pumps provide the reliability and chemical resistance needed to keep plating lines running 24/7. The pumps excel in both continuous circulation duties and intermittent batch transfers, offering the flexibility to adapt to the specific requirements of decorative chrome, hard chrome, electroless nickel, zinc, tin, copper, and precious metal plating as well as Type II and Type III anodizing lines. Below are the most common application areas where our pumps deliver measurable operational improvements.

Process Circulation & Filtration

• Primary Tank Circulation: The pumps are sized to turn over the entire plating bath volume multiple times per hour, ensuring homogeneity of chemical additives, brighteners, and temperature. The sealless design prevents bath contamination and guarantees consistent plating quality across the entire rack or barrel load.
• Filter Feed Pumping: Sealless pumps deliver high pressure and steady flow to cartridge, bag, or plate-and-frame filters without pulsation. This protects the filter media and ensures efficient removal of particulate contaminants down to 1 micron, critical for bright nickel and acid copper baths.
• Carbon Treatment Loops: During periodic purification cycles, the pump circulates bath solution through activated carbon beds to remove organic impurities. The ability to handle entrained carbon fines without seal damage makes sealless pumps the only reliable choice for this intermittent but aggressive service.
• Electrolyte Agitation: Vigorous solution movement across the cathode surface is essential for high-current-density plating. Mag-drive pumps produce directed flow via eductors or spargers, minimizing boundary layer thickness and enabling faster plating rates without burning.
• Heat Exchanger Recirculation: Plating baths are often maintained at elevated temperatures via external heat exchangers. Our pumps provide the reliable recirculation required to keep thermal loops charged, withstanding temperature differentials that would cause mechanical seal face distortion and rapid failure.
• Reel-to-Reel Selective Plating: Precision applications such as connector strip plating require micro-accurate flow delivery. The non-pulsating characteristics of centrifugal mag-drive pumps ensure exact electrolyte distribution across moving strip surfaces, eliminating dry spots or over-plating.

Chemical Transfer, Dosing & Waste Treatment

• Concentrated Acid Unloading: Tank truck or tote unloading of 93% sulfuric, 37% hydrochloric, or phosphoric acids demands a pump that cannot leak. Sealless magnetic drive pumps provide safe, rapid transfer with zero emissions, protecting workers and eliminating corrosion on nearby equipment.
• Additive Dosing Skids: Precise injection of brighteners, levelers, and surfactants is vital for deposit properties. Sealless pumps coupled to flow meters and control systems deliver metered dosing without contamination or leakage of expensive specialty chemicals.
• Rinse Water Recirculation: Counter-flow rinse systems use pumps to move water from final rinse stages back to earlier stages, reducing water consumption. Mag-drive pumps handle the slightly contaminated rinsewaters without risk of seal flush dilution or leakage.
• Waste Acid Neutralization: The transfer of spent acid to neutralization tanks involves aggressive, often hot, acidic streams. Sealless pumps handle the large solids burden and low pH without clogging or corrosion, ensuring uninterrupted waste treatment operations.
• Filter Press Feed: Dewatering of metal hydroxide sludges from wastewater treatment requires high-pressure feed with abrasive solids. Mag-drive pumps with reinforced impellers and wear rings deliver the necessary pressure while resisting erosion and maintaining containment.
• Electroless Nickel Solution Transfer: These baths are extremely sensitive to contamination and operate at 185-195 degree F. A sealless pump prevents metallic ion pickup from seal corrosion and maintains the thermal stability of the autocatalytic chemistry.
• Anodizing Dye Circulation: Organic dye solutions for architectural anodizing must be filtered and cooled continuously. Sealless pumps avoid seal-induced shear that can break down dye molecules, while the pulse-free flow ensures even color distribution.

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Key Features of HIS Sealless Pumps for Plating

Every HIS pump designed for the plating industry incorporates advanced engineering features that directly address the root causes of pump failure in corrosive and high-temperature services. These features are not add-ons but are integral to the pump's DNA, ensuring that the unit will perform reliably from day one even under the harshest conditions. Our design philosophy focuses on eliminating maintenance burdens while maximizing hydraulic efficiency and chemical compatibility.

Every HIS pump designed for the plating industry incorporates advanced engineering features that directly address the root causes of pump failure in corrosive and high-temperature services. These features are not add-ons but are integral to the pump's DNA, ensuring that the unit will perform reliably from day one even under the harshest conditions. Our design philosophy focuses on eliminating maintenance burdens while maximizing hydraulic efficiency and chemical compatibility.

The combination of a heavy-wall containment shell, oversized silicon carbide or carbon fiber reinforced PTFE bearings, and optimized hydraulic passages results in a pump that can handle solids up to 5 percent by volume without clogging. The rear casing design allows for in-line maintenance, meaning the pump can be inspected and bearings replaced without disturbing the piping or motor connections. This is a significant advantage in crowded plating line layouts where downtime directly impacts production throughput. Below are the specific features that set HIS sealless pumps apart from conventional sealed alternatives.

• Hermetic Containment Shell: The thick, one-piece non-metallic containment shell isolates the pumped fluid from the atmosphere completely. Manufactured from solid PVDF or ETFE with zero porosity, the shell withstands internal pressures up to 250 PSI and provides a secondary layer of chemical resistance beyond the outer magnet ring, ensuring absolute leak-free performance for the pump's entire service life.
• Neodymium Magnet Coupling: Rare earth neodymium-iron-boron magnets are encapsulated within the outer drive and inner driven assemblies. The synchronous coupling transmits torque across the containment shell without any physical penetration, enabling full motor horsepower to be transferred while the inner shaft remains entirely sealed within the process fluid, eliminating the need for shaft seals, packing, or flush systems.
• Internal Recirculation Path: A precisely engineered internal flow path diverts a small portion of the pumped liquid through the bearing chamber and back to the suction eye. This self-flushing design continuously lubricates and cools the silicon carbide bearings and thrust washers using the process fluid itself, ensuring stable thermal conditions even when handling hot plating solutions up to 250 degree F.
• Solid-Ready Semi-Open Impeller: The impeller is designed with a rear shroud and generous clearance between vanes, allowing suspended particles and crystalline solids commonly found in plating baths to pass through without binding or abrasion. The impeller geometry is optimized for maximum NPSHr characteristics, making the pump exceptionally tolerant of low-tank-level conditions without cavitation.
• Heavy Duty Bearing System: The shaft is supported by generous length-to-diameter ratio journal bearings made from silicon carbide against carbon fiber reinforced PTFE composite. This bearing pair provides a hardness differential that resists galling, operates with an extremely low coefficient of friction, and withstands the chemical attack from strong acids and alkalis without degradation.
• Adjustable Thrust Balance: The rear-facing thrust bearing assembly absorbs axial loads generated during operation and can be field-adjusted to compensate for wear over time. This extends the mean time between overhauls significantly and allows the pump to be restored to factory-spec internal clearances without requiring complete disassembly or replacement of major components.
• Dry-Run Protection: Unlike mechanically sealed pumps that fail within 30 seconds of running dry, our carbon fiber reinforced bearing materials can withstand short-term dry running without catastrophic seizure. When paired with an optional power monitor relay, the pump automatically shuts down before damage occurs, protecting your investment during unforeseen low-level scenarios.
• Zero Emissions Compliance: The total enclosure of the process fluid within the non-metallic pump structure guarantees zero fugitive emissions. This is crucial for plating shops subject to EPA Method 21 leak detection requirements, OSHA air contaminant limits for chromic acid and cyanide mists, and ISO 14001 environmental management standards.

Detailed Technical Specifications & Performance Envelope

Our sealless pumps for the plating industry are manufactured to meet HI (Hydraulic Institute) standards and are available in a broad performance envelope to satisfy every pumping duty encountered in a modern surface finishing facility. The hydraulic selection spans from low-flow, high-head circulation pumps for small process tanks to high-flow units capable of moving thousands of gallons per minute across large central filtration systems. Below is a comprehensive technical overview of the standard product range, with custom options available for extreme or specialized duties.

All pumps are factory-tested on water and undergo a rigorous performance, vibration, and hydraulic integrity check before dispatch. The magnetic coupling is designed with a 1.5 service factor to prevent decoupling under normal process upsets, and the containment shell is hydrostatically tested to 1.5 times the maximum allowable working pressure. Material certificates, positive material identification (PMI) reports, and dimensional inspection sheets are supplied as standard documentation with every pump, providing full traceability for quality-critical plating processes.

• Flow Rate Range: The standard product line covers capacities from 1 GPM to 2,500 GPM (0.2 m3/hr to 568 m3/hr). This wide range ensures that a single pump design philosophy can serve drum transfer applications, small laboratory plating cells, mid-size job shop lines, and large high-volume automotive plating installations.
• Total Dynamic Head: Pumps are selected for heads up to 300 feet (91 meters) at 60 Hz operation. High-head models utilize multi-vane impellers and optimized volute cutwater clearances to achieve discharge pressures suitable for filter press feed, spray nozzle applications, and long transfer lines with significant friction losses.
• Temperature Capability: Standard pumps are rated for continuous operation at fluid temperatures from 20 degree F to 250 degree F (-29 degree C to 121 degree C). For extreme hot electroless nickel or hard chrome baths above 200 degree F, special high-temperature bearing materials and an external cooling jacket on the containment shell are available.
• Materials of Construction - Wetted Parts: The standard wetted materials are unfilled polypropylene (PP) for general acid and alkaline service up to 180 degree F, glass-filled polypropylene for enhanced mechanical strength, and solid PVDF or ETFE for extreme chemical resistance and elevated temperature applications including concentrated nitric and chromic acids.
• Casing & Volute Design: The pump casing is a thick-section, corrosion-resistant thermoplastic with a tangential discharge and centerline-mounted suction for self-venting properties. The volute is computer-modeled using CFD analysis to minimize hydraulic losses and radial thrust, resulting in vibration levels below 2.5 mm/s RMS and bearing life exceeding 25,000 operating hours under normal conditions.
• Motor & Drive Configuration: Standard motor options include TEFC (Totally Enclosed Fan Cooled) and explosion-proof enclosures in NEMA or IEC frame sizes from 0.5 HP to 75 HP, with 2-pole (3450 RPM) and 4-pole (1750 RPM) speeds. All motors are fitted with a stainless steel shaft and C-face adapter for precise alignment with the magnetic drive assembly.
• Connection Standards: Pumps are supplied with ANSI 150 lb flanged connections, socket weld, or threaded NPT/BSP options to match existing plant piping. Flange drilling to DIN, JIS, or other international standards is available upon request, simplifying integration into both new installations and retrofit projects across global plating facilities.
• Instrumentation Readiness: Every pump casing features tapped and plugged ports for suction and discharge pressure gauges, temperature sensors, and vibration monitoring transducers. This allows direct integration with plant-wide SCADA and distributed control systems without the need for expensive retrofits, enabling real-time condition monitoring and predictive maintenance scheduling.

The HIS Pumps and Systems Advantage: Unmatched Plating Industry Expertise

With decades of focused experience in corrosive chemical transfer, HIS Pumps and Systems has become the trusted partner for plating facilities across North America, Europe, and Asia. Our engineering team does not simply sell pumps from a catalog; we understand the electrochemistry of plating baths, the operational rhythms of a busy plating line, and the catastrophic consequences of unscheduled downtime. When you choose HIS, you gain access to application engineers who will visit your facility, analyze your specific fluid properties and piping layout, and select or customize a pump that fits your process like a glove. Our commitment extends far beyond the initial sale, encompassing full lifecycle support, comprehensive spare parts inventory, and rapid on-site service when needed.

Our vertical integration as a manufacturer allows us to maintain tight control over material quality, machining tolerances, and assembly procedures. Every containment shell, magnet assembly, and bearing set is produced and tested in-house under an ISO 9001 certified quality management system. This results in a product that consistently outperforms generic industrial pumps in the harsh plating environment. Furthermore, our proactive technical support team provides chemical compatibility reviews for new plating solutions, conducts on-site vibration analysis, and offers training programs for maintenance personnel to ensure your team can independently manage the pump fleet with confidence.

The true measure of our success is the long-term partnerships we have built with leading plating job shops, tier-1 automotive suppliers, aerospace coating facilities, and electronics PCB manufacturers. These customers report pump service lives exceeding 10 years with minimal intervention, dramatic reductions in chemical waste, and a safer workplace environment. Choosing HIS means investing in a relationship that delivers continuous operational improvement, not just a transactional equipment purchase. We stand behind every pump with an industry-leading warranty and a 24/7 technical hotline that connects you directly to a senior engineer.

• Dedicated Plating Industry Specialists: Our sales and engineering teams include former chemical process engineers and plating line managers who understand the nuances of Hull Cell tests, brightener compatibility, and anode basket maintenance. This domain expertise translates into pump recommendations that account for suspended solids, gas bubble evolution, and crystallizing chemistries unique to plating.
• Comprehensive In-House Testing Laboratory: We operate a dedicated chemical testing facility where we can evaluate your actual process fluids against our materials of construction. Samples of your bath solution, rinse water, or waste acid are subjected to immersion testing at operating temperature for extended periods to validate material compatibility before a pump is specified or shipped.
• Large Readily Available Spare Parts Inventory: We maintain a substantial inventory of bearings, containment shells, O-rings, gaskets, and complete rotating assemblies for our entire product range. Same-day shipment of critical spares minimizes downtime and eliminates the need for customers to carry large internal spare part stockpiles.
• Global Field Service Network: Our certified service partners are located in all major industrial regions, capable of performing on-site vibration analysis, laser alignment, bearing replacement, and full pump overhauls. Emergency field service can often be dispatched within 24 hours to minimize production disruption on critical plating lines.
• Custom Engineered Solutions: Beyond standard catalog pumps, we design and manufacture custom pump configurations including vertical cantilever designs for sump applications, multi-stage assemblies for high-pressure spray wash systems, and packaged skid-mounted systems with integrated tanks, controls, and duplex pump arrangements for zero-downtime redundancy.
• Operator & Maintenance Training Programs: We provide comprehensive on-site training for your maintenance team covering pump theory, mechanical assembly and disassembly procedures, troubleshooting common faults, and best practices for extending pump service life. Training documentation and service manuals are provided in both printed and digital formats with color-coded assembly diagrams.
• Lifecycle Cost Analysis Support: Our application engineers can conduct a detailed comparison of total cost of ownership between your existing sealed pump fleet and proposed sealless replacements. This analysis factors in energy consumption, seal replacement costs, downtime losses, wastewater treatment charges, and projected maintenance labor, often demonstrating a return on investment of less than 18 months.

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Comprehensive Chemical Compatibility for Plating Solutions

Material selection is the single most critical factor in ensuring long, trouble-free pump service life in the plating industry. A pump constructed from an incompatible thermoplastic will quickly suffer from chemical attack, softening, swelling, or stress cracking, leading to premature failure and potential bath contamination. HIS provides pumps in three primary material grades, each optimized for specific families of plating chemicals, concentrations, and operating temperatures. The following compatibility guide is based on extensive laboratory immersion testing and decades of field experience across thousands of plating installations worldwide.

It is important to note that chemical compatibility is not solely determined by the base chemical but also by the presence of additives, inhibitors, and the synergistic effects of mixed-acid environments common in plating baths. For example, a chromic acid bath with sulfate catalysts behaves differently than pure chromic acid. Similarly, cyanide-based baths require careful consideration of the alkaline pH modifier. Our technical team routinely evaluates entire bath formulations, not just the primary acid or base, to ensure the recommended pump material will withstand the precise chemical environment over the full expected operating temperature range.

Material Selection by Chemical Service

• Polypropylene (PP) - General Acid & Alkali Service: Unfilled polypropylene offers excellent resistance to hydrochloric acid (up to 37%), sulfuric acid (up to 80% at temperatures below 160 degree F), sodium hydroxide (up to 50%), and most plating rinse waters. It is the most economical choice for general corrosion duties but has a maximum continuous service temperature of 180 degree F, limiting its use in hot nickel or chrome baths.
• Glass-Filled Polypropylene (GFPP) - Enhanced Mechanical Strength: The addition of 20-30% glass fiber reinforcement substantially increases the tensile and flexural strength of the polypropylene matrix. GFPP is recommended for larger pumps handling abrasive slurries or where high piping loads are expected. It maintains the same broad chemical compatibility as unfilled PP but can operate at slightly higher temperatures and pressures without deformation.
• PVDF (Kynar) - High-Temperature Acid & Halogen Service: Polyvinylidene fluoride offers a step-change improvement in temperature capability up to 250 degree F and exceptional resistance to wet chlorine, bromine, concentrated nitric acid, and hot chromic acid solutions. PVDF is the material of choice for hard chrome plating, electroless nickel, and any process involving halogenated compounds or mixed-acid environments with oxidizing agents.
• ETFE (Tefzel) - Ultimate Chemical Resistance: Ethylene tetrafluoroethylene is a partially fluorinated polymer with near-universal chemical resistance, including concentrated sulfuric acid (93-98%), fuming nitric acid, and hydrofluoric acid at elevated temperatures. ETFE pumps are the ultimate polymer choice for plating operations using hydrofluoric acid, 98% sulfuric, or mixed-acid chromic solutions at temperatures up to 300 degree F. ETFE is virtually immune to stress cracking and maintains full mechanical integrity even after prolonged exposure to strong oxidizing agents. HIS offers ETFE pumps with carbon fiber reinforced ETFE bearings for complete chemical inertness.
• Bearing & Thrust Washer Materials: The inner bearing system uses a combination of silicon carbide against a carbon fiber reinforced PTFE composite for standard acid services, or pure silicon carbide against itself for high-temperature oxidizing environments where even PTFE may be attacked. This ensures reliable wear characteristics regardless of the plating chemistry, with no metallic components in the wetted path to corrode or contaminate the bath.
• Elastomer & Gasket Selection: O-rings and static seals are available in EPDM for alkaline and mildly acidic solutions, Viton for general acid and high-temperature service, and encapsulated PTFE or Kalrez for the most severe chemical environments including concentrated nitric and mixed acid solutions. The correct elastomer prevents external weepage and ensures the pump remains fully sealed over thousands of thermal cycles.
• Metallic Component Isolation: All external hardware, motor shafts, and fasteners are isolated from the process fluid by the containment shell and non-metallic casing. For aggressive fume environments, 316 stainless steel or Hastelloy C-276 fasteners are used to resist atmospheric corrosion. This ensures that no metallic ions can leach into the plating bath, a critical requirement for high-purity electronics and decorative finishing.
• Cyanide Bath Compatibility: Cyanide-based copper and zinc plating baths are highly alkaline and chemically aggressive towards many plastics. Polypropylene and PVDF both exhibit excellent resistance, but careful temperature control is essential. HIS recommends PVDF for high-temperature cyanide baths to prevent softening, and EPDM O-rings to handle the alkaline environment without degradation.
• Electroless Nickel Solution Resistance: The autocatalytic chemistry of electroless nickel operates at 185-195 degree F and is highly susceptible to metallic contamination. PVDF or ETFE construction is mandatory, as any metallic ions can initiate spontaneous bath decomposition. Silicon carbide bearings are selected to prevent any catalytic effect from wear particles.

The final material selection always requires a detailed review of the complete plating bath recipe, including any proprietary additives that may alter the chemical aggressiveness. HIS provides a chemical compatibility questionnaire and, when necessary, conducts accelerated immersion testing at our laboratory to confirm material suitability before finalizing pump specifications. This rigorous approach eliminates the guesswork and guarantees that the pump you receive is chemically optimized for its intended service life of ten years or more.

Step-by-Step Sealless Pump Selection Guide for Plating Lines

Selecting the correct sealless pump for a specific plating duty is a systematic process that requires careful consideration of the fluid chemistry, hydraulic requirements, and installation constraints. The following guide outlines the decision-making process that HIS application engineers follow to ensure that every pump delivered is perfectly matched to its intended service. By working through these steps with your HIS representative, you can be confident that the pump will deliver the required hydraulic performance while resisting the chemical attack and thermal stresses of the plating process. The selection process outlined below transforms a complex engineering challenge into a clear, data-driven decision that guarantees operational success.

Key Selection Criteria

• Chemical Composition of the Plating Bath: Begin by compiling the full chemical recipe, including the concentration of primary acids, metal salts, brighteners, surfactants, and pH buffers. This information is critical to select the correct polymer (PP, PVDF, ETFE) and elastomer materials that will provide long-term corrosion resistance without leaching contaminants into the process.
• Operating Temperature Range: Determine the minimum and maximum temperatures the pump will see during normal operation, idle periods, and cleaning cycles. Temperature directly impacts material strength and chemical aggressiveness. For baths exceeding 200 degree F, PVDF or ETFE construction becomes mandatory, and bearing materials must be evaluated for thermal stability.
• Presence of Solids or Abrasives: Identify the type, size, and concentration of suspended solids such as anode bag fibers, carbon fines, or precipitated metal particles. Abrasive service dictates the need for a semi-open impeller and hardened bearing materials. HIS can adjust clearances and recommend wear-resistant internal coatings to handle slurries up to 5% solids by volume.
• Required Flow Rate and Total Head: Accurately define the design operating point and any variation in demand. The pump must operate within its best efficiency point (BEP) range for the majority of its duty cycle to minimize radial loads on the bearings and maximize energy efficiency. Provide piping isometric drawings for accurate head loss calculations.
• Suction Conditions and NPSH Available: Evaluate the static height of the liquid above the pump centerline, the vapor pressure of the fluid at operating temperature, and the suction piping friction losses. Sealless pumps require adequate NPSH margin to prevent cavitation that can damage the containment shell. HIS engineers will verify NPSH safety margins before final selection.
• Installation Environment: Consider ambient conditions such as the presence of corrosive fumes, washdown requirements, and hazardous area classification. The motor enclosure, external hardware material, and paint system must be specified accordingly. For explosive atmospheres, explosion-proof or increased-safety motors are mandatory and must be clearly communicated during pump selection.
• Control Philosophy: Decide whether the pump will run at constant speed across-the-line, or whether variable frequency drive (VFD) control is desired for flow modulation. VFD-compatible motors and the potential for low-speed bearing lubrication issues in sealless pumps must be addressed to avoid dry-bearing operation at reduced speeds.
• Maintenance Accessibility: Evaluate the physical space around the pump installation for bearing replacement and impeller inspection. HIS close-coupled designs require less real estate, while our back-pullout long-coupled pumps allow the rotating element to be removed without disturbing the motor or piping, minimizing downtime on critical lines.

Sizing the Pump Hydraulically

• Flow Rate Determination: For tank circulation, calculate the total bath volume and the desired turnover rate (typically 4-10 times per hour for plating baths). For transfer duties, define the required volume per minute based on process timing. HIS engineers will cross-reference this with the pump's performance curve to select an impeller diameter that operates near the BEP.
• Total Dynamic Head Calculation: Sum the static lift, friction losses in piping, valves, elbows, filter housings, heat exchangers, and spray nozzles. Provide a piping isometric with line sizes, lengths, and fittings for a precise calculation. Undersized piping can choke the pump and reduce flow, while oversized piping unnecessarily increases system cost.
• Motor Sizing and Service Factor: The motor horsepower is selected by computing the absorbed power at the design flow and fluid specific gravity, then applying a safety service factor of 1.15 for non-overloading throughout the impeller diameter range. This ensures the motor does not trip under viscosity changes or slightly higher-than-design flow conditions.
• Viscosity and Specific Gravity Corrections: Plating solutions can have specific gravities above 1.2 g/cm3. The pump performance curve must be corrected for these denser fluids. HIS application software automatically adjusts head, flow, and absorbed power for the actual fluid density and viscosity, yielding a true performance prediction for the process fluid.
• Minimum Continuous Flow Bypass: Sealless centrifugal pumps require a minimum flow rate to dissipate heat generated in the magnetic coupling and bearings. A continuous bypass line or recirculation orifice is sized to guarantee this minimum flow even when the main discharge valve is throttled closed, protecting the pump from thermal damage.

Installation & Configuration Options

• Close-Coupled Monoblock: The pump is directly mounted to a C-face motor via a rigid bracket, resulting in a compact footprint ideal for crowded plating line layouts and limited floor space. Maintenance is simplified as the entire rotating assembly can be removed as one unit after disconnecting the casing bolts.
• Long-Coupled with Bearing Frame: For larger horsepower applications above 20 HP, a separate bearing frame with its own shaft and bearings is used between the motor and the magnetic drive. This design isolates the motor from process heat and provides stable support for the heavy magnet assembly, ensuring extended bearing life in continuous duty.
• Vertical Immersion Configuration: The pump head is submerged directly into the plating tank with the motor mounted above the liquid level via a column pipe. This eliminates suction piping and priming concerns, making it the preferred choice for sump pits, rinse tanks, and deep process vessels where floor space is at a premium.
• Vertical Immersion Configuration: The pump head is submerged directly into the plating tank with the motor mounted above the liquid level via a column pipe. This eliminates suction piping and priming concerns, making it the preferred choice for sump pits, rinse tanks, and deep process vessels where floor space is at a premium.
• Duplex and Redundant Systems: For critical plating processes that cannot tolerate any downtime, HIS supplies duplex skid-mounted pump systems with automatic lead-lag alternation and failover. This ensures continuous circulation even during a primary pump failure, and allows for on-line maintenance without interrupting production.
• Explosion-Proof and HazLoc Compliance: Many plating lines involve flammable solvents or are located in hazardous classified areas. HIS sealless pumps can be provided with ATEX, IECEx, or NEC Class I Division 1 motor and grounding configurations, with anti-static construction and conductive containment shells where required for safe operation.

Final Validation and Documentation

• Performance Test Certificate: Every pump undergoes a factory hydrostatic and performance test according to HI standards, with a certified test curve provided. This confirms that the pump meets the specified flow, head, efficiency, and NPSHr before shipment.
• Installation, Operation, and Maintenance (IOM) Manual: A comprehensive IOM manual includes step-by-step commissioning instructions, bearing clearance adjustment procedures, magnetization/demagnetization cautions, and a detailed troubleshooting table. Digital and printed copies are supplied with each pump.
• Commissioning Support: HIS service engineers are available to supervise the initial start-up and alignment, verify bearing temperatures and vibration levels, and train the plant maintenance team on-site. This ensures the pump is installed and operating optimally from the very first day.
• Post-Installation Review: Within 90 days of start-up, an HIS engineer will contact you to review operational performance, check for any early signs of bearing wear, and make recommendations for optimizing the duty point. This proactive review extends pump life and prevents unexpected failures.