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PSG® Markets
Pumps for Seal-Less Chemical Handling
Seal-less chemical handling focuses on preventing leaks at the pump by eliminating traditional rotating shaft seals (a common failure point in chemical service).
Contributors
This page was developed with input from PSG® subject-matter experts who support chemical transfer and compatibility-driven applications across multiple industries. The technical guidance reflects practical selection, troubleshooting and lifecycle considerations informed by those interviews.
Chemical transfer systems often operate with low tolerance for leaks. Even small seepage can create safety and environmental concerns, increase cleanup time and trigger compliance issues.
Seal-less pump technologies help reduce leak risk by removing the mechanical seal as a primary failure point and relying on designs that keep the pumped fluid contained within the wet end.
Across PSG®, seal-less solutions are used in many chemical process environments. For an overview of PSG’s® chemical-market capabilities, see Pumps for Chemicals.
Why Chemical Compatibility Is the Real Make-or-Break Factor
In chemical service, compatibility issues are often slow and cumulative rather than immediate. Elastomers may swell, soften, shrink or crack over weeks or months, and plastics can craze or embrittle, which gradually reduces reliability. For a practical guide to recognizing early warning signs, see 5 Signs Chemical Compatibility Is Slowly Destroying Your Pump.
Compatibility also depends on conditions. A material that performs well at ambient temperature may fail faster when temperature rises, concentration increases, or when the fluid contains aggressive additives. Because of that, chemical compatibility tools should be treated as a starting point, not the final decision, especially for hazardous or high-value fluids.
To verify compatibility, start with the wetted parts that actually contact the fluid. You can review material ratings and chemical compatibility details on each product page, or use the Pump Finder to match your application to pumps built with the right wetted materials. From there, confirm the final selection with your fluid's SDS, concentration and temperature range.
AODD Pumps: A Practical Seal-less Standard for Chemical Transfer
AODD pumps are widely used for chemical handling because they are seal-less by design and can be configured with broad material options (metals and plastics, plus multiple elastomers) to match chemical compatibility requirements. Wilden® and All-Flo® both support chemical process applications: Wilden® Chemical Process and All-Flo™ Chemical Process.
In real plants, AODD pumps are commonly used for drum and tote transfer, batching and blending support, tank recirculation, sump and pit service, offloading and general-purpose chemical movement. They are also used where intermittent duty is common and teams value simple maintenance and rebuildability.
For more on how diaphragm pumps work and why they’re widely used for chemical and industrial transfer, see the AODD technology overview. You can also browse available products by brand: Shop Wilden® and Shop All-Flo™.
Diaphragm Material Strategy: Extending Life in Aggressive Chemical Service
Diaphragms are a primary wear component in AODD pumps, and diaphragm material selection can strongly influence lifecycle in chemical service. Wilden offers multiple diaphragm types and materials designed to improve durability and compatibility. Explore options here: Wilden® Diaphragms.
For general industrial and chemical applications involving acids, caustics and other aggressive fluids, Wilden® Chem-Fuse™ Integral Piston Diaphragms (IPD) are designed to improve durability and reduce entrapment areas compared to conventional diaphragm designs.
Specialized Chemical-Resistance Options for Extreme Fluids
Some processes involve fluids that are unusually toxic, corrosive or costly to contain. In these cases, specialized chemical-resistant AODD designs and conductive materials may be required.
PSG’s Almatec® portfolio is positioned for chemical and industrial fluid transfer where higher chemical resistance or specialty construction is needed. For example, Almatec® E-Series pumps include PE/PTFE construction and options for conductive variants depending on the hazard profile.
For hose-pump applications and additional chemical-compatibility reference material, PSG also provides guidance through Abaque® hose selection and chemical compatibility resources.
Selection Checklist for Seal-less Chemical Handling
Use this checklist to align seal-less pump selection with real chemical-service demands:
• Identify the exact fluid, concentration and temperature range (include cleaning fluids or rinse cycles if applicable).
• Confirm whether the chemical is flammable, toxic, oxidizing, or regulated, containment requirements change quickly with hazard profile.
• Verify compatibility for all wetted parts (housings/manifolds, diaphragms, balls/seats, O-rings). Prioritize wetted parts over external hardware.
• Check suction conditions: lift, hose length, strainers/filters and the likelihood of vapor formation.
• Account for solids, crystallization or abrasive content that could accelerate wear.
• Consider discharge pressure and duty cycle (continuous, intermittent, batching) to avoid oversizing or unnecessary energy consumption.
• Plan exhaust handling for air-driven pumps when vapors or odors need control (use appropriate exhaust routing/containment practices).
• Standardize spares (wet kits/diaphragms/valves) to reduce downtime and shorten repair cycles.
Maintenance, Troubleshooting and Downtime Prevention
Compatibility-driven failures are often misdiagnosed because pumps can keep running while internal materials degrade. Use early indicators such as swelling, softening, surface tackiness, cracking or changes in valve seating performance.
In chemical service, the fastest path to reliability is often standardization. When teams standardize pump models and wet-end materials around a known set of chemicals, they reduce spare-part complexity, rebuild time and repeat failure cycles.
Finding the Right Pump and Parts
If you need help selecting a seal-less pump or replacement parts, you can contact the PSG® Store team.
You can also start with our chemical-market selection content here: Pumps for Industrial Chemical Transfer Systems.
For additional information, please review our returns policy, shipping policy and terms and conditions, including our terms of use.
Contributors
Rob Jack
Diaphragm pump specialist with deep expertise in wear drivers, diaphragm material behavior and practical troubleshooting. Jack supports customers in interpreting compatibility guidance and translating it into real pump configurations.
Frequently Asked Questions About Seal-Less Chemical Pumping
Seal-less typically means the pump does not rely on a rotating shaft mechanical seal to contain the fluid. Instead, containment is achieved through a different design approach (for example, diaphragm or hose technology). Eliminating the mechanical seal reduces one of the most common leak points in chemical service.
Yes. AODD pumps are seal-less by design because they do not use a rotating shaft seal in the wet end. They are widely used for chemical transfer when configured with compatible materials for housings, manifolds, diaphragms and valve components.
Start with the exact fluid, concentration and temperature range, then verify compatibility for every wetted component. Compatibility tools provide a useful baseline (often rated A/B/C/D), but real performance depends on operating conditions. Use the fluid SDS and confirm any uncertainty with a specialist, especially for hazardous or high-value chemicals.
Many material reactions accelerate with temperature. Elastomers can soften or swell faster, plastics can lose mechanical properties sooner, and process conditions like vapor formation or thermal cycling can create additional stress. A selection that works at ambient temperature may not hold up in heated chemical transfer or CIP-like cleaning conditions.
Common early indicators include diaphragm swelling or softening, valve-seat deformation, sticky surfaces, cracking or embrittlement, and a gradual loss of performance (flow or prime) even though the pump still runs. These issues are often slow and cumulative, so early diagnosis prevents repeat failures.
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