Why Rotary Gear Pumps for Chemical Transfer
Chemical processing environments demand pumps that resist corrosion, deliver precise flow rates, and handle a wide range of viscosities — from thin solvents to thick polymer solutions. NAPCO stainless steel rotary gear pumps are designed for exactly this range of applications.
The positive displacement design means flow rate remains consistent regardless of viscosity or downstream pressure changes — essential for chemical batching, reactor charging, and process fluid recirculation where precise volumes matter.
Corrosion Resistant
Full stainless steel wetted path — housing, shaft, and end covers — resists attack from acids, bases, and aggressive solvents.
Chemical-Compatible Gears
Nitrile gears for standard chemical applications. Viton gears available for aggressive chemicals, high temperatures, and solvent exposure.
Seal Options
Viton high-pressure and low-pressure seals standard on all models. Compatible with a wide range of chemical process fluids.
No Pulsation
Smooth, continuous flow reduces stress on piping systems and downstream equipment — important in metering and dosing applications.
Stainless Steel — The Right Material for Chemical Service
Every NAPCO stainless steel pump uses a stainless housing and stainless shaft, providing a fully corrosion-resistant fluid path from inlet to outlet. This construction handles the chemical environments that would quickly degrade carbon steel or ductile iron alternatives.
For general chemical transfer and moderately corrosive fluids, the standard nitrile rubber gears (rated to 240°F) provide excellent performance and wear life. For exposure to aromatic solvents, fuels, strong acids, or elevated temperatures, Viton gears extend chemical compatibility and temperature range significantly.
Recommended Pumps for Chemical Processing
PA300S — 3″ Stainless Steel
High-capacity pump for bulk chemical transfer, reactor charging, and large-volume process fluid movement.
| Max Flow | 158 GPM @ 280 RPM |
| Max Pressure | 100 PSI |
| Housing | Stainless Steel |
| Gears | Nitrile or Viton |
| Weight | 173 lbs |
PA200S — 2″ Stainless Steel
Compact pump for smaller chemical lines, laboratory pilot plants, and applications with space constraints.
| Max Flow | 69 GPM @ 190 RPM |
| Max Pressure | 100 PSI |
| Housing | Stainless Steel |
| Gears | Nitrile or Viton |
| Weight | 114 lbs |
Ductile iron versions (PA300C, PA200C) available for non-corrosive chemical transfer where cost optimization is a priority.
Chemical Processing Applications
- —Corrosive chemical transfer — Moving acids, bases, and aggressive process chemicals between storage, mixing, and processing equipment.
- —Solvent handling — Transfer of aromatic and aliphatic solvents, cleaning agents, and coating solutions where chemical resistance is essential.
- —Polymer and resin processing — Pumping viscous polymer solutions, liquid resins, and precursor chemicals in continuous manufacturing processes.
- —Chemical batching and metering — Precise volume-per-revolution displacement for accurate chemical batching, reactor charging, and dosing operations.
- —Waste chemical handling — Transfer of spent process chemicals, wash solutions, and chemical waste streams for treatment or disposal.
Choosing the Right Gear Material for Your Chemical
| Gear Material | Temperature Range | Best For |
|---|---|---|
| Nitrile (Standard) | Up to 240°F | General chemical transfer, water-based solutions, moderate chemical exposure, petroleum-based fluids |
| Viton (Optional) | Extended range | Aggressive solvents, strong acids and bases, high-temperature applications, aromatic hydrocarbons, fuel-grade chemicals |
Not sure which gear material is right for your application? Contact our engineering team with your chemical and operating conditions and we'll recommend the best configuration.
Related Technical Resources
Gear Pumps for Chemical Transfer
In-depth guide to selecting and operating rotary gear pumps for corrosive and aggressive chemical applications.
Nitrile vs. Viton Gears
Chemical compatibility and temperature guide for choosing the right gear material.
Stainless Steel vs. Ductile Iron Pumps
Housing material guide — why stainless steel is the standard for chemical processing environments.
Need a pump for chemical processing?
Tell us about your chemical, operating temperature, and flow requirements — we'll recommend the right NAPCO pump and material configuration.
Request a Quote