Contamination-Free Sealless Pump for Pharmaceutical Applications

Sealless Pumps for Pharmaceuticals: Precision Fluid Handling Without Compromise

In the pharmaceutical industry, the integrity of every fluid transfer operation directly impacts final product quality and patient safety. Sealless pumps represent the gold standard for moving high-purity solvents, active pharmaceutical ingredients (APIs), biological media, and aggressive cleaning agents. By eliminating dynamic seals and the associated risks of leakage, these pumps provide a hermetically sealed pressure boundary that ensures absolute containment. HIS Pumps and Systems delivers a comprehensive portfolio of sealless pumping solutions, including magnetic drive centrifugal pumps, canned motor designs, and hydraulically actuated diaphragm pumps, all engineered to meet the most rigorous cGMP, FDA, and EHEDG guidelines.

Unlike conventional sealed pumps that rely on mechanical seals or packing, sealless technology uses either a static containment shell around a magnetic drive or a flexible diaphragm to isolate the process fluid from the atmosphere. This fundamental design difference translates into zero process fluid leakage, no cross-contamination, and drastically reduced maintenance. For pharmaceutical manufacturers, the result is a pump that can safely handle non-lubricating solvents, high-purity water for injection (WFI), viscous polymer solutions, and even shear-sensitive suspensions, all while maintaining steady-state flow accuracy better than ±1%. The compact footprint and extremely low pulsation characteristics further enhance their suitability for downstream purification steps like HPLC, ultrafiltration, and nanofiltration.

Core Sealless Pump Technologies Offered

• Magnetic Drive Centrifugal Pumps: Transmission of torque occurs through a non-physical magnetic coupling across a static containment shell. This eliminates shaft seals completely, making them ideal for high-flow, low-viscosity solvent transfer and recirculation loops where even micro-leakage is unacceptable.
• Canned Motor Pumps: The motor rotor and bearings operate directly in the process fluid, encased in a hermetically sealed can. This design provides the ultimate leak-proof barrier for hazardous or extremely expensive fluids and is widely used in API synthesis and organic solvent handling.
• Hydraulically Actuated Diaphragm Pumps: A flexing diaphragm driven by hydraulic fluid separates the process liquid from the drive end. Their precise, low-pulse flow and ability to handle suspended solids make them the premier choice for chromatography, filtration, and aseptic filling applications.
• Mechanically Actuated Diaphragm Pumps: Direct mechanical linkage moves the diaphragm, providing a cost-effective sealless solution for lower pressure duties like chemical dosing and clean-in-place (CIP) fluid supply, while still maintaining leak-tight integrity.
• Peristaltic Pumps (Sealless Alternative): Though not traditional sealless volumetric pumps, peristaltic designs provide inherent fluid isolation by compressing a flexible tube. They are often specified for single-use or low-flow dosing applications where quick-change tubing simplifies contamination control.
• Custom Hybrid Solutions: HIS Pumps and Systems also engineers tailored skids that combine multiple pump technologies, pulsation dampening, and control instrumentation to deliver a complete process package validated for pharmaceutical use.

Why Pharmaceutical Manufacturing Requires Specialized Sealless Pumps

Pharmaceutical production environments present a unique confluence of extreme chemical, thermal, and regulatory demands that standard industrial pumps simply cannot meet. The fluids involved are often categorized as high-potent active pharmaceutical ingredients (HPAPIs), cytotoxic compounds, or biologically derived molecules where even parts-per-billion contamination can invalidate an entire batch. A sealless pump eliminates the single most vulnerable point of any rotating equipment: the dynamic shaft seal. By replacing a mechanical seal with a static containment shell or diaphragm, the pump guarantees that no external contaminants can enter the process stream, and equally important, no hazardous process fluid can escape into the surrounding cleanroom environment, thereby protecting both operators and product sterility.

Beyond contamination control, pharmaceutical processes demand materials that can withstand a barrage of aggressive cleaning cycles. Clean-in-place (CIP) and steam-in-place (SIP) protocols routinely expose wetted surfaces to 1-3% sodium hydroxide at 85°C, followed by purified water rinses and then saturated steam at 121-135°C for validated sterilization. A pump specified for these applications must be constructed entirely from high-alloy stainless steels (316L, 1.4435), advanced fluoropolymers (PTFE, PFA, ETFE), and FDA-compliant elastomers. The sealless architecture naturally supports these materials because it avoids the complex multi-component seal faces that degrade under thermal cycling. HIS sealless pumps are meticulously engineered with surface finishes of Ra ≤ 0.8 µm or better, electropolished as required, to prevent biofilm formation and ensure drainability, directly contributing to repeatable sterilization cycles and extended service intervals.

The hydraulic performance of sealless pumps must also align precisely with the low-flow, high-head demands typical in downstream purification, while withstanding the high-flow, low-head recirculation needed during reaction and mixing. Selecting a specialized pump that cannot deadhead, handles low NPSH available, and operates quietly without generating destructive heat is paramount. The absence of a seal flush system reduces utility costs and eliminates the risk of product dilution. These technical benefits, combined with full documentation packages including material certificates, surface roughness reports, and factory acceptance tests (FAT), make a purpose-built sealless pump an indispensable asset for any modern pharmaceutical facility striving for process excellence and regulatory compliance according to ICH Q7A and local GMP guidance.

• Absolute Containment of HPAPIs: Sealless magnetic drive and canned motor pumps create a true hermetic envelope around cytotoxic and high-potency compounds, safeguarding operator exposure limits (OEL) down to nanogram levels without requiring elaborate double mechanical seal barrier fluid systems that add complexity and maintenance.
• Full CIP/SIP Compatibility: All wetted components are designed with crevice-free construction and enclosed internal side channels to ensure complete wettability and drainage. The pumps can be cleaned in place without disassembly, validated to achieve a 6-log reduction of bacterial spores as required by USP <1211>.
• Zero Cross-Contamination: The static seal design eliminates the recirculation loop that exists in traditional seal flush plans, preventing vapor migration and microbial ingress during idle periods. This is critical when switching between product campaigns in multipurpose API facilities.
• Handling of Non-Lubricating Fluids: Many organic solvents (acetone, methanol, acetonitrile) have negligible lubricity and would instantly destroy a conventional mechanical seal. A sealless pump uses product-lubricated internal bearings made of silicon carbide or PTFE-carbon, which are chemically inert and thrive in these conditions.
• Shear-Sensitive Media Transfer: Diaphragm sealless pumps provide gentle, low-shear positive displacement ideal for protein solutions, vaccines, and blood plasma derivatives where mechanical agitation can denature delicate molecules and reduce therapeutic efficacy.
• Drainability and Cleanability: Housing geometry is optimized using computational fluid dynamics to eliminate dead legs, ensuring that after a drain cycle, residual liquid volume is less than 0.1% of total wetted volume. This directly supports WFI loop purity and reduces rinse water consumption.
• Thermal Shock Resistance: During steam sterilization, the pump body experiences rapid temperature gradients. The selected materials have matched coefficients of thermal expansion (CTE) to prevent gapping at gasket interfaces and maintain hermetic integrity cycle after cycle.
• No Barrier Fluid System Required: Conventional dual mechanical seals require a compatible barrier fluid system with reservoirs, coolers, and controls. A sealless pump eliminates this ancillary equipment entirely, simplifying installation, reducing energy consumption, and removing a potential source of product interaction.

Critical Applications of Sealless Pumps in Pharmaceutical Manufacturing

The deployment of sealless pumps in a pharmaceutical plant spans the entire production lifecycle, from raw material charging through final purification and formulation. In API synthesis, magnetic drive centrifugal pumps are essential for transferring corrosive reagents like thionyl chloride, trifluoroacetic acid, and mixed solvent systems under inert atmosphere. The ability to provide a sealed, air-free transfer path prevents moisture ingress and maintains reaction yield. For continuous flow chemistry, which is rapidly replacing batch methods to improve safety and yield, sealless pumps must deliver pulsation-free flow against back pressures of 100 bar or more, a task perfectly suited to high-pressure diaphragm pumps with precisely machined pump heads and active flow control via variable frequency drives.

In purification and bioprocessing suites, sealless pumps serve as the workhorses behind column chromatography, tangential flow filtration (TFF), and aseptic filling lines. For protein capture on Protein A affinity columns, a quaternary diaphragm pump provides the low-pulsation gradient flow necessary to maintain a stable pH and conductivity front, directly influencing the purity of the eluted monoclonal antibody. In WFI storage and distribution loops, a canned motor pump maintains sanitary circulation at high temperature (>80°C) without any risk of seal leakage. The internal rotor cooling design of these pumps allows them to run continuously for months, a vital characteristic for maintaining a self-sanitizing state in pharmaceutical water systems. Every application benefits from the reduced footprint, low noise emission (<70 dBA), and ability to be fully drained before a CIP cycle, satisfying the stringent engineering standards of ISPE Baseline Guide Volume 4.

• High-Purity Solvent Delivery: Acetonitrile, methanol, tetrahydrofuran, and other HPLC-grade solvents require metal-free or inert wetted parts to prevent ionic contamination. Sealless pumps with PFA-lined casings and PTFE diaphragms maintain purity levels below 10 parts per billion total organic carbon.
• Continuous Manufacturing and Flow Chemistry: For the synthesis of intermediates like Grignard reagents or diazomethane, the sealless pump's hermetic sealing and precise flow rate control (turndown ratio of 10:1 or better) enable safer, scalable reaction processing in microreactors and coiled tube reactors.
• WFI and Pure Steam Condensate Return: In water-for-injection loops, the pump must handle water at temperatures up to 90°C without cavitation. A canned motor pump with a low NPSHr impeller design and internal product-lubricated bearings ensures silent, maintenance-free operation over years of continuous runtime.
• Chromatography Gradient Systems: Quaternary diaphragm pumps deliver accurate blends of buffer A, buffer B, and sample by individually adjustable pump heads. Their hydraulic balancing provides a ripple-free flow profile necessary to maintain a stable baseline for UV and mass spec detection at 280 nm.
• Aseptic Filling Lines: Dispensing pumps for vials, syringes, and IV bags require accurate volumetric dispensing within ±0.5% tolerance. Sealless diaphragm or peristaltic pump heads with disposable fluid paths eliminate cross-contamination risk between batches and integrate directly into isolator or RABS environments.
• Tangential Flow Filtration (TFF): The recirculation pump in a TFF skid must generate high crossflow velocity without pulsation to prevent membrane fouling. Magnetic drive centrifugal pumps with frequency inverter control provide smooth ramp-up profiles and stable pressure across spiral-wound and hollow-fiber membranes.
• CIP and SIP Skid Integration: Dedicated CIP supply pumps built as sealless units provide a reliable, leak-free source of hot caustic and acid solutions. The pumps are often equipped with double containment shells or leak detection sensors to provide an additional safety layer in automated cleanroom environments.
• Fermentation and Cell Culture: Media transfer pumps for bioreactors must be fully drainable and sterilizable. Sealless pumps with Tri-Clamp or DIN 11864 connections support the sterile boundary and prevent shear damage to mammalian cells during harvesting operations.
• Lyophilization (Freeze-Drying): Accurate dosing of liquid product into vials prior to freeze-drying requires a pump with minimal residual volume and high precision. Sealless diaphragm pumps deliver repeatable shot sizes with minimal temperature rise, preserving the biological activity of heat-sensitive proteins.
• Vaccine Adjuvant Processing: Emulsions of squalene or aluminum salts require gentle, low-shear pumping to maintain the micro-particle size distribution essential for immunogenicity. Sealless positive displacement designs maintain the stability of these complex fluid structures without causing phase separation.

Request a Customized Sealless Pump Quote

Ready to specify a sealless pump that meets your exact pharmaceutical process requirements? Our engineers are prepared to develop a detailed quotation including full performance curves, material certifications, and a compliance matrix. Provide your flow rate, differential head, fluid composition, and temperature range, and we will select the optimal sealless technology with all required documentation for your validation package. Click below to send your data and receive a comprehensive proposal within one business day.

Key Features of Pharmaceutical-Grade Sealless Pumps

The hallmark of any pharmaceutical sealless pump lies in its meticulously engineered feature set designed for the trifecta of safety, purity, and cleanability. The magnetic coupling in a magnetic drive pump is constructed with rare-earth neodymium-iron-boron (NdFeB) magnets encapsulated entirely within a Hastelloy C-276 or PFA shell, ensuring that no process fluid ever contacts the magnet material. The torque transfer across this stationary shell is achieved through synchronous magnetic fields, with a power transmission efficiency exceeding 95% when properly aligned. On the canned motor side, a thin non-magnetic stator can made of Inconel 625 or ceramic zirconia separates the motor windings from the fluid cavity, with the pumped liquid itself providing lubrication and cooling for the rotor bearing assemblies. This eliminates the need for auxiliary lubrication systems and allows the pump to run dry momentarily without catastrophic failure, a safety feature critical in pharmaceutical process upsets.

Diaphragm sealless pump features focus on the flexing element's longevity and sterility. The diaphragms are fabricated from single or double layers of PTFE reinforced with an EPDM or FKM backing, providing chemical resistance across the entire 0-14 pH range while maintaining the flex life exceeding 100 million cycles at rated discharge pressure. An integrated hydraulic pressure relief system protects the diaphragm from over-pressurization, automatically bypassing fluid internally when the set pressure is exceeded. The pump head geometry is precision-machined from solid 316L stainless steel billets, mirror-polished to Ra ≤ 0.5 µm to minimize particle adhesion. Every feature, from the sanitary clamp connections to the sterile port adapters, is designed to be cleaned by the turbulent flow of CIP solutions rather than requiring manual disassembly, aligning perfectly with the principles of Quality by Design (QbD) and single-minute exchange of die (SMED) concepts applied to pharmaceutical manufacturing.

Additional features that elevate these pumps to pharmaceutical-grade include integrated temperature and vibration sensors that communicate directly with the Distributed Control System (DCS) via 4-20 mA or HART protocols. Bearing wear monitoring through magnetic flux sensors provides predictive failure alerts weeks in advance, enabling planned maintenance during scheduled shutdowns rather than reactive responses. For critical applications, a double containment shell with a pressure switch or a conductivity probe in the interstitial space offers a secondary leak detection barrier. The pump casings are often jacketed for heating or cooling, maintaining the fluid temperature within a narrow 2°C band to prevent precipitation of heat-sensitive compounds. All these features collectively ensure that the sealless pump is not merely a component but a fully integrated, intelligent asset on the pharmaceutical production network.

• Hermetic Containment Shell: The static containment shell is hydrostatically tested to 1.5 times the maximum allowable working pressure (MAWP) and is available in Hastelloy C-22, Inconel, or PFA-lined 316L. This creates a zero-leakage barrier rated for the full range of pharmaceutical solvents, including halogenated organics like dichloromethane.
• Low NPSHr Impeller Designs: The first-stage impeller is a specially designed inducerscrew or a recessed vortex design that reduces the Net Positive Suction Head required (NPSHr) below 0.6 meters. This is vital when transferring volatile solvents from sealed, low-head tanks or reactor vessels under vacuum.
• Product-Lubricated SiC Bearings: Internal radial and thrust bearings are manufactured from sintered alpha-silicon carbide (SiC) with a diamond-like carbon (DLC) coating. These materials provide a hardness greater than 2800 Vickers, exceptional wear resistance in low-viscosity solvents, and full FDA/3-A compliance for incidental food contact.
• Tri-Clamp and DIN 11864 Connections: All process connections are standardized sanitary fittings with self-centering clamp grooves. The bore matches the ID of connected pharmaceutical tubing exactly (OD/ID) to eliminate internal steps where particulate matter could accumulate and resist cleaning.
• Electropolished Wetted Surfaces: After machining, all wetted metallic surfaces undergo electropolishing per ASME BPE SF4 standards, achieving Ra values of 0.5 µm (20 µin) or finer. This finish reduces bacterial adhesion by over 90% compared to a ground finish, accelerating CIP validation cycles.
• Integrated Non-Return Valves: Some sealless diaphragm pumps include built-in ball-and-spring or flap-type check valves with a cracking pressure of 0.1 bar, preventing reverse flow and product contamination without adding additional components or tri-clamp joints in the fluid path.
• ATEX or IECEx Compliance: For solvent-rich atmospheres where explosive vapors may accumulate, the pump motors and magnetic couplings are certified for Zone 1 or Division 1 hazardous areas, with temperature class T4 or better, ensuring safe operation in bulk solvent storage and reactor feed applications.
• Modular Pump Head Design: Interchangeable pump heads across a common drive allow the same pump chassis to be used for multiple flow ranges (0.1 to 1000 mL/min), simply by swapping the diaphragm and valve assembly. This reduces spares inventory and simplifies process scale-up from R&D to pilot plant.
• Dry-Run Protection System: Advanced power monitoring and temperature sensors embedded in the containment shell detect low-fluid conditions within 200 milliseconds. The control system automatically reduces motor speed or initiates a shutdown sequence, preventing the catastrophic heat buildup that can damage magnetic couplings and warp expensive pump components during process upsets.

Technical Specifications and Performance Envelopes

Understanding the precise technical capabilities of a sealless pump is essential for proper sizing, installation, and validation within a pharmaceutical facility. The hydraulic performance envelope of HIS sealless magnetic drive centrifugal pumps spans flow rates from 0.1 m³/h to over 300 m³/h, with differential heads reaching up to 250 meters per stage. The pumps are engineered to operate at motor speeds ranging from 750 to 3600 RPM using variable frequency drives, enabling precise flow modulation. The suction pressure capability is rated from full vacuum conditions up to 40 bar g, depending on the casing material and containment shell thickness. For diaphragm pump configurations, the flow range extends from 0.01 mL per stroke for micro-dispensing to 60 m³/h for large-scale transfer, with discharge pressures up to 350 bar for HPLC and continuous manufacturing applications. Every pump is factory-tested on a certified test bed with NIST-traceable instrumentation, and a complete performance test report including a head-capacity curve, efficiency plot, net positive suction head (NPSH) curve, and vibration analysis is provided as part of the standard documentation package.

The electrical and instrumentation specifications are equally rigorous. Motor options include IE3 premium efficiency TEFC motors suitable for inverter duty, with insulation Class H and a service factor of 1.15 for continuous operation. For canned motor pumps, the motor winding is insulated with a specialized cross-linked polyethylene dielectric that withstands temperatures up to 180°C within the fluid boundary. Bearing temperature sensors (PT100 RTDs) are embedded directly in the bearing housing, and a magnetic flux leakage sensor monitors the condition of the magnetic coupling in real time. The pumps can be supplied with an integrated control panel housing a VFD, PLC, and HMI touchscreen that displays flow rate, totalized flow, discharge pressure, and diagnostic alarms. Communication protocols include PROFIBUS DP, Modbus RTU/TCP, and EtherNet/IP, allowing seamless integration into a pharmaceutical plant's automation architecture and supporting the data integrity requirements of 21 CFR Part 11 through electronic batch recording systems.

Material traceability and surface finish documentation are fundamental to pharmaceutical validation. Each pressure-containing component is permanently laser-marked with a unique heat number that cross-references to a 3.1 material certificate per EN 10204, detailing the chemical composition, mechanical properties, and intergranular corrosion test results. Surface roughness measurements are conducted using a calibrated profilometer at multiple points on each wetted component, with a minimum of five readings taken and recorded. All elastomeric components, including O-rings, gaskets, and diaphragm backings, are supplied with certificates of conformance referencing USP Class VI, <87> and <88> biological reactivity test data. The full material traceability package is compiled in a turn-over document to support the Installation Qualification (IQ) phase, enabling the pump to be seamlessly integrated into a validated process or qualified utility system with complete transparency of all product-contact materials.

• Flow Range (Centrifugal Mag-Drive): 0.1 to 300 m³/h with a turndown ratio of 10:1 via VFD control. The impeller diameter is trimmed to the exact process duty point on a CNC lathe to ensure that the pump operates within 5% of its Best Efficiency Point (BEP), maximizing energy savings and minimizing bearing wear.
• Discharge Pressure (Diaphragm Pumps): Up to 350 bar for metering and continuous manufacturing. The hydraulic end is equipped with a built-in pressure relief valve and a pulsation dampener that reduces residual pulsation amplitude to less than ±2% of the mean flow, critical for UV detector baselines.
• Temperature Range: Wetted parts are rated for continuous operation from -40°C (for cold solvent recirculation) up to 250°C for heat transfer fluids and SIP cycles. Material selection accounts for differential thermal expansion, and PTFE envelope gaskets with corrugated stainless steel cores accommodate the full range without cold flow or stress relaxation.
• Viscosity Capability: Magnetic drive centrifugal pumps can handle viscosities up to 500 cP with a moderate correction factor applied to the performance curve. For higher viscosities up to 100,000 cP, positive displacement diaphragm pumps with large ball valves and spring-assisted closure are specified to maintain volumetric efficiency above 95%.
• Sound Pressure Level: Guaranteed to not exceed 68 dBA at 1 meter from the pump casing under full load conditions. The hydraulic design features double-volute casings and optimized vane passing frequencies that reduce tonal noise, making these pumps ideal for installation within open-plan cleanroom suites where operator comfort is paramount.
• Ingress Protection: Motors are available with IP55, IP65, or IP66 ratings to withstand the frequent washdowns typical in pharmaceutical manufacturing. The terminal box is potted or sealed with a high-temperature silicone gasket, preventing moisture ingress even during direct hose-directed cleaning with water jets at 3 bar pressure.
• Connections and Porting: Standard sanitary connections include Tri-Clamp (ISO 2852), DIN 11864-1 (sterile flange), and DIN 11864-2 (sterile thread). The internal bore is honed to match Schedule 10S tubing dimensions, ensuring a smooth, step-free transition from pump casing to process piping that maintains plug flow characteristics during product transfer.
• Surface Finish Certification: Every pump casing, impeller, and pump head is supplied with a surface roughness certification report. Measurements are taken with a Mitutoyo SJ-210 or equivalent profilometer at five designated locations per ASME BPE-2022, Table SF-2.5, with acceptance criteria of Ra ≤ 0.5 µm for product-contact surfaces and ≤ 0.8 µm for non-product contact surfaces.
• Containment Shell Integrity Testing: Each magnetic drive containment shell undergoes a helium leak test per ASTM F2391, with a maximum allowable leak rate of 1 x 10^-6 mbar·L/s. This test verifies the integrity of the static seal weld and the non-porous nature of the shell material, providing documented proof of hermetic containment at a sensitivity orders of magnitude greater than a hydrostatic pressure test.

Why Choose HIS Pumps and Systems for Your Pharmaceutical Pump Needs

Selecting HIS Pumps and Systems as your sealless pump provider means partnering with an organization that possesses deep domain expertise in both pump engineering and pharmaceutical regulatory compliance. Our engineering team comprises specialists who have collectively executed over 500 successful installations in GMP-regulated facilities worldwide. We do not simply sell a catalogue pump; we engage in a rigorous front-end engineering design (FEED) process where every pump is configured to match the specific chemical resistance, thermal profile, cavitation margin, and pulsation tolerance of your unique process. Our application engineers use computational fluid dynamics (CFD) to model the flow through the pump casing, ensuring that there are no low-velocity zones (below 1.5 m/s) where product could stagnate and compromise cleanability. This level of detailed analysis is delivered before any purchase order is placed, giving you complete confidence in the technical viability of the proposed solution.

Our commitment extends far beyond the equipment supply. We understand that documentation is a deliverable equal in importance to the physical pump in a pharmaceutical context. Therefore, every pump from HIS is accompanied by a comprehensive validation documentation package that includes a Factory Acceptance Test (FAT) protocol pre-approved for your review, a detailed Installation, Operation, and Maintenance (IOM) manual with exploded view drawings, a full material certification dossier organized per ASME BPE requirements, and a Certificate of Compliance confirming that the pump meets the essential hygiene and safety principles of the Machinery Directive and relevant GMP annexes. After installation, our service engineers are available for on-site commissioning support, including vibration baseline readings, thermography scans, and functional safety checks. We offer extended service contracts that include annual performance audits where we disassemble and inspect the pump internals, measure clearance wear against original specifications using calibrated micrometers, and provide a predictive wear trend analysis to optimize your preventive maintenance schedule and avoid unplanned production downtime.

The HIS advantage is deeply rooted in our aftermarket and continuous improvement philosophy. We maintain a fully stocked warehouse with genuine OEM spare parts, including silicon carbide bearing sets, containment shells, PTFE diaphragms, and gasket kits, all with full traceability back to their respective material heats. Our rapid response team can dispatch these components within 24 hours to minimize any interruption to pharmaceutical production. Additionally, we operate a pump refurbishment and re-certification workshop where pumps can be returned from the field, disassembled, cleaned, inspected, and re-certified to original OEM specifications with a new test certificate. This remanufacturing service includes electropolishing touch-up, replacement of all wear components, and a final hydraulic performance test, effectively resetting the pump's life cycle at a fraction of the cost of a new unit. This closed-loop approach reduces total cost of ownership and aligns with the pharmaceutical industry's environmental sustainability goals by minimizing waste and raw material consumption over the equipment lifecycle.

• Deep Pharmaceutical Regulatory Knowledge: Our team includes former pharmaceutical process engineers who understand the nuances of ICH Q7, 21 CFR Part 210/211, and Annex 1. This enables us to anticipate your qualification documentation needs and address regulatory concerns proactively during the design phase, rather than reacting during the audit.
• Complete FAT and SAT Support: We invite you to witness the factory acceptance test, either in person or via live video stream. The test is executed against a protocol that includes hydrostatic testing, vibration analysis per ISO 10816, flow performance mapping, and control system functional testing. This ensures that the pump arrives on site ready for immediate installation and operational qualification.
• Rapid Prototyping and Testing: For novel or high-risk fluids, we can conduct material compatibility testing in our lab. We immerse representative material coupons in your actual process fluid at operating temperature and pressure for up to 30 days, then perform gravimetric analysis, dimensional checks, and microscopic examination to confirm no swelling, cracking, or weight change greater than 0.5%.
• Global Supply Chain and Local Support: With manufacturing partnerships across three continents and regional service hubs, HIS ensures that you receive genuine OEM spares and technical support within 24-48 hours, no matter where your facility is located. This reduces the Mean Time To Repair (MTTR) and keeps your pharmaceutical production lines running.
• Customized Training Programs: We provide on-site or virtual training for your maintenance and engineering staff. The curriculum covers proper CIP/SIP procedures, bearing wear interpretation, seal-less troubleshooting, and safe handling of the pump during chemical changeovers, ensuring your team can operate and maintain the equipment with full competence and confidence.
• Single-Source Accountability: We take full responsibility for the pump system, including the baseplate, motor, VFD, sensors, and wiring. If an issue arises, there is no finger-pointing between component suppliers; one call to HIS resolves it all. This single-source accountability streamlines your procurement and validation processes.
• Continuous Product Improvement: Feedback loops from our installed base are actively incorporated into our engineering revisions. If a particular elastomer shows improved steam resistance or a new bearing material reduces wear in a specific solvent, we proactively share this data with existing customers and offer retrofit kits to enhance in-service equipment without requiring a new pump purchase.
• Transparent Commercial Terms: We provide clear, itemized quotes with no hidden fees. The price includes all documentation packages, initial commissioning support, and a 24-month warranty. Extended warranty options with annual performance checks are available, giving you predictable lifecycle costs and peace of mind.

Get Expert Consultation for Your Pharmaceutical Pump Application

Navigating the selection of a sealless pump for a critical pharmaceutical process can be complex. Whether you are designing a new WFI loop, scaling up a continuous manufacturing line, or upgrading an aging seal pump to a modern hermetic solution, our senior engineers are here to guide you through every technical detail. Click the button below to start a direct conversation with a pump specialist who understands the pharmaceutical industry's unique sterility, cleanability, and documentation challenges. We will provide preliminary sizing, material recommendations, and a compliance overview within the same conversation.

Material Compatibility for Aggressive Pharmaceutical Fluids

The pharmaceutical industry utilizes an exceptionally broad palette of chemicals, from strong acids and bases to highly polar organic solvents and complex biological molecules. Selecting the correct wetted materials for a sealless pump is not merely a matter of chemical resistance charts; it requires an understanding of the synergistic effects of temperature, concentration, and stress that the pump components will experience. For metallic components, the stainless steel 316L (UNS S31603) with a low sulfur content (0.005-0.017%) is the baseline, offering excellent resistance to pitting and crevice corrosion in chloride-bearing environments up to ambient temperature. For more aggressive acid media or elevated chloride levels above 200 ppm, a super austenitic stainless steel such as 904L or AL-6XN may be required, offering a Pitting Resistance Equivalent Number (PREN) above 42. For the ultimate in corrosion resistance against hot acids and caustics, Hastelloy C-276 (UNS N10276) provides near-universal corrosion resistance and is often specified for the containment shell and internal bushings.

In the realm of non-metallic wetted components, polytetrafluoroethylene (PTFE) and its copolymers (PFA, FEP) serve as the primary lining and diaphragm materials due to their near-perfect chemical inertness and wide temperature range. PTFE diaphragms offer the lowest friction and highest flex life, but require a backing layer of EPDM or FKM to provide mechanical strength and resilience. For peristaltic pump tubing, platinum-cured silicone and thermoplastic elastomers like Santoprene are selected based on extractables and leachables (E&L) profiles, with full testing data available. Gaskets and O-rings are typically available in EPDM, FKM, FFKM (perfluoroelastomer), and PTFE envelope designs. All elastomers are sourced from FDA-compliant batches and can be provided with full certification of compliance to USP <87> and <88> for cytotoxicity and systemic injection, ensuring that they will not adulterate the pharmaceutical product even under worst-case process conditions. This meticulous material selection process ensures long-term reliability, reduces the risk of batch contamination, and supports the validation argument that the equipment is fit for its intended use.

Common Material Options and Their Applications

• 316L Stainless Steel (1.4404): Standard for WFI loops, buffer solutions, and non-corrosive solvents. Its low carbon content prevents carbide precipitation during welding, preserving corrosion resistance after fabrication. Electropolished to Ra ≤ 0.5 µm, it provides an inert, readily cleanable surface suitable for most non-aggressive pharmaceutical contact applications.
• Hastelloy C-276 (UNS N10276): The industry standard for handling concentrated hydrochloric acid, sulfuric acid, and chlorinated solvents at elevated temperatures. Its high molybdenum and chromium content provides superb resistance to localized corrosion and stress corrosion cracking, making it the material of choice for containment shells in multi-purpose API plants.
• PTFE (Polytetrafluoroethylene): Used for diaphragms, bellows, and pump head linings. It exhibits a universal chemical resistance profile across the 0-14 pH range and a service temperature up to 180°C. Its extremely low surface energy (18 dynes/cm) makes it non-stick, facilitating easy cleaning and minimizing product holdup in dead zones.
• PFA (Perfluoroalkoxy Alkane): A melt-processable fluoropolymer with similar melt flow properties to PTFE but with improved mechanical strength and clarity. PFA-lined pump casings provide a seamless, non-porous barrier against ultra-high-purity solvents, with a surface smoothness that rivals electropolished metal and eliminates any risk of metallic ion leaching into the product stream.
• Silicon Carbide (SiC): The preferred bearing material for magnetic drive and canned motor pump internal bearings. Alpha-sintered SiC offers a Knoop hardness of 2800, excellent thermal conductivity (120 W/m·K), and a coefficient of friction below 0.1 when lubricated by the process fluid. It is inert to all pharmaceutical solvents and acids, with no measurable wear over 20,000 operating hours in clean fluid service.
• EPDM (Ethylene Propylene Diene Monomer): The default elastomer for WFI and pure steam applications up to 150°C. It offers excellent resistance to hot water, steam, and polar solvents like acetone and ethanol. USP Class VI certified EPDM gaskets and O-rings are peroxide-cured to minimize extractables, providing a clean, non-leaching seal for sterile connections.
• FFKM (Perfluoroelastomer): The highest-performance elastomer, offering chemical resistance approaching that of PTFE itself. Kalrez or Chemraz compounds are specified for aggressive solvent and strong acid services where standard FKM would swell or degrade. Although more expensive, FFKM O-rings can extend mean time between maintenance from months to several years in challenging chemical environments.
• Inconel 625 (UNS N06625): Often used for the stator can in canned motor pumps, this nickel-chromium-molybdenum alloy provides excellent resistance to chloride stress corrosion cracking and maintains high tensile strength at elevated temperatures, making it ideal for SIP cycles where the can experiences rapid thermal transients up to 140°C.
• Zirconia Ceramic (ZrO2): Used as an alternative can material or bearing insert in highly abrasive or corrosive services. Transformation-toughened zirconia provides exceptional fracture toughness and thermal shock resistance, and its bright white color makes visual inspection for cracks or surface defects straightforward during preventive maintenance.
• DLC (Diamond-Like Carbon) Coatings: Applied via plasma-enhanced chemical vapor deposition (PECVD) to silicon carbide bearings, DLC coatings reduce the coefficient of friction to below 0.05 and increase surface hardness to over 4000 HV. This is particularly beneficial for pumps handling ultra-low-viscosity fluids like liquid CO2 or supercritical fluids where traditional bearing lubrication is marginal.

How to Select the Correct Sealless Pump for Your Pharmaceutical Process

Selecting the optimal sealless pump requires a systematic evaluation of the process fluid properties, hydraulic requirements, and operational constraints that define your pharmaceutical application. The selection process begins with a complete characterization of the fluid: its chemical composition, concentration of aggressive species, viscosity at both ambient and operating temperatures, vapor pressure curve, and any suspended solids content. For pharmaceutical applications, the presence of trace chloride ions, even at 50 ppm, can dictate whether a standard 316L stainless steel or a higher alloy is required for the wetted path, especially if the fluid temperature exceeds 60°C where the risk of pitting corrosion increases exponentially. The fluid's vapor pressure and the available net positive suction head (NPSHa) in the system will determine if a standard centrifugal impeller is sufficient or if an inducer stage, a recessed impeller, or a positive displacement diaphragm technology must be selected to prevent damaging cavitation that can erode pump internals and generate particulate contamination. This initial fluid characterization form is the single most important step in ensuring that the selected pump will operate reliably and maintain the purity of the pharmaceutical product over its entire service life.

Once the fluid chemistry is understood, the hydraulic requirements must be mapped with precision. Define the required flow rate range, including the minimum, normal, and maximum flow rates. The pump must be capable of operating within its allowable operating region (AOR) at all times, preferably between 70% and 110% of its best efficiency point (BEP) for centrifugal designs. Specify the differential pressure or total dynamic head (TDH) at each flow condition, accounting for static head, friction losses through piping and equipment, and any pressure requirements of downstream unit operations like chromatography columns or filter housings. For metering and dosing applications, the required accuracy, linearity, and repeatability of the flow must be specified as a percentage of setpoint. A diaphragm pump with a variable stroke mechanism and electronic flow control can achieve a steady-state accuracy of ±0.5% of setpoint, whereas a centrifugal pump with a flow control loop and a magnetic flow meter can achieve ±1% of actual flow. The required turndown ratio will often dictate whether a single pump or multiple parallel pumps with sequencing control are necessary to cover the full operating envelope without operating in low-flow, high-vibration regions that accelerate bearing wear.

The operational environment and regulatory context provide the final set of selection criteria. For installation in a classified cleanroom (ISO 7 or better), the pump must have a smooth, cleanable exterior surface free of ledges, exposed threads, and horizontal surfaces where dust can settle. The motor cooling fan must be shrouded and the terminal box sealed to IP65 to withstand surface decontamination with hydrogen peroxide vapor or chlorine dioxide gas. If the pump will be subjected to automated CIP and SIP cycles, the material selection must be verified for compatibility with the cleaning chemicals, the design must ensure complete drainability with no siphon effects, and the thermal expansion stresses during steam heating must be analyzed to confirm that gasket compression is maintained. The pump's instrumentation and control strategy should be integrated with the plant's automation system to enable electronic batch recording, and the maintenance schedule should be aligned with the plant's planned shutdown windows. HIS Pumps and Systems provides a structured selection questionnaire and offers on-site engineering audits to methodically work through each of these factors, ensuring that the recommended sealless pump not only meets the technical specification but also integrates seamlessly into your validated pharmaceutical manufacturing environment.

Step-by-Step Selection Criteria

• Step 1: Fluid Characterization: Document the full chemical composition, including trace impurities like chlorides or peroxides. Measure viscosity at minimum and maximum operating temperatures using a rotational viscometer. Determine if the fluid is Newtonian or non-Newtonian, as shear-thinning or thixotropic behavior will influence the effective viscosity within the pump and may require a positive displacement solution.
• Step 2: Define Hydraulic Duty: Plot the system curve and superimpose the required operating points. Calculate the NPSHa using the worst-case scenario (highest temperature, lowest tank level, lowest barometric pressure). Select a pump technology whose NPSHr is at least 1 meter below the lowest NPSHa to provide a margin against cavitation and ensure quiet, vibration-free operation.
• Step 3: Select Pump Technology: For low-viscosity, high-flow applications (above 5 m³/h) with moderate head, select a magnetic drive centrifugal pump. For high-head, low-flow metering (below 1000 L/h), select a hydraulically actuated diaphragm pump. For viscous or shear-sensitive fluids above 200 cP, select a diaphragm pump or a peristaltic pump with appropriately sized tubing.
• Step 4: Choose Wetted Materials: Based on the fluid characterization from Step 1, consult corrosion resistance databases and material compatibility guides. For unknown or complex mixtures, request a material compatibility test from HIS. Select the containment shell material, bearing material, diaphragm material, and elastomeric seals to provide a minimum expected service life of 24 months under continuous operation.
• Step 5: Specify Surface Finish: Determine the required surface roughness for product-contact surfaces based on the process criticality. For sterile API and parenteral applications, specify Ra ≤ 0.5 µm with electropolishing. For oral solid dosage forms and less critical utilities, Ra ≤ 0.8 µm may be acceptable. Ensure that the specified finish is achievable on all internal passages, not just accessible surfaces.
• Step 6: Confirm CIP/SIP Requirements: If the pump will be cleaned and sterilized in place, verify that all wetted components will withstand the thermal and chemical cycles. Specify the CIP sequence (rinse, caustic wash, acid wash, final rinse) and SIP parameters (121°C or 134°C, duration, cooling method). Select materials and gaskets that maintain their sealing properties across the full temperature range without requiring re-torqueing.
• Step 7: Define Instrumentation and Control: Specify the required monitoring points (temperature, pressure, flow, vibration) and the communication protocol for integration with the plant DCS or SCADA. Determine if a local control panel with HMI is needed for stand-alone operation or if all control will be performed remotely. Ensure that the instrumentation meets any hazardous area classification requirements for solvent-handling areas.
• Step 8: Plan Documentation Package: Identify the required documentation deliverables, including a full material certification package per EN 10204 3.1, surface finish certification (Ra values with profilometer trace), weld log and NDE reports for pressure boundary components, a Factory Acceptance Test (FAT) protocol aligned with GMP equipment qualification guidelines, a detailed Installation and Operation Manual, and a statement of conformity to relevant FDA and EHEDG criteria. This pre-agreed document set will form the foundation of your Turnover Package and accelerate the Installation Qualification (IQ) phase on site.
• Step 9: Validate Installation and Piping Arrangement: Verify that the pump can be installed with straight pipe runs of at least 5 pipe diameters upstream and 3 diameters downstream to ensure uniform velocity profile at the suction flange. Confirm that the pump casing vent and drain connections are accessible, and that the pump can be fully drained by gravity into a floor sloped toward a process drain. Review the support structure and baseplate design for FDA cleanroom compatibility with stainless steel shims and levelling feet that do not trap moisture. This physical installation planning prevents cavitation, vibration, and microbial growth issues that would otherwise emerge during operational qualification.
• Step 10: Pre-Commissioning Check and Risk Assessment: Perform a process hazard analysis (PHA) or HAZOP review specific to the pump installation, considering failure modes such as containment shell rupture, magnetic decoupling, diaphragm fatigue, and loss of cooling flow. Define the safety instrumented function (SIF) requirements and any interlock logic required. Conduct a pre-startup safety review (PSSR) with all stakeholders, and schedule the initial baseline vibration and temperature readings at the time of commissioning to establish a reference for predictive maintenance trending over the pump's life cycle.