Industry — Explosives & Mining
Rotary Gear Pumps for Emulsion Explosives & Mining
Stainless rotary gear pumps for plant and surface transfer of emulsion explosives, bulk matrix, and ammonium nitrate blends. Not borehole injection duty.
A gear pump for explosives moves emulsion, bulk matrix, and ANFO slurry on plant and surface lines. NAPCO builds stainless PA300S and PA200S for that duty: self-priming, bi-directional, and rebuildable in the field with a matching kit. Flow stays predictable as viscosity changes. Use stainless when ammonium nitrate is in the fluid. Progressive cavity pumps stay the usual choice for high-pressure borehole injection; NAPCO owns zero-pressure and low-pressure transfer.
Why Rotary Gear Pumps for Emulsion Explosives
Emulsion explosives — including ammonium nitrate emulsions, bulk matrix, and sensitized blends — require pumps that can handle viscous, shear-sensitive materials safely and reliably. When operators search for a gear pump for explosives service, the requirements are always the same: low-shear positive displacement, corrosion-resistant construction, and field serviceability. NAPCO rotary gear pumps are a proven solution for this demanding application because of their simple, robust design.
Unlike progressive cavity pumps, rotary gear pumps have fewer moving parts, no stator wear, and no need for complex alignment during rebuilds. As a mining pump for surface transfer duty, this translates to lower total cost of ownership and less downtime — critical at remote mine sites where every hour of production matters.
Self-Priming
No need for external priming systems — NAPCO pumps draw emulsion directly from tanks, totes, and process vessels.
Bi-Directional
Reverse rotation for loading and unloading operations without re-plumbing. CW/CCW operation from a single pump.
Field-Serviceable
Complete rebuild with a factory-matched repair kit — gears, seals, bearings, and gaskets. No specialized tools or factory return required.
Consistent Flow
Positive displacement design delivers predictable flow rates regardless of viscosity changes in the emulsion.
Emulsion, ANFO slurry, and bulk matrix transfer
Plant transfer is not one fluid label. Operators move bulk emulsion products, ammonium nitrate emulsion, and ANFO slurry between tanks, totes, mixers, and load-out.
NAPCO stainless gear pumps handle that viscous, shear-sensitive work at zero or low pressure. See bulk emulsion products, ANFO / ammonium nitrate pumping, and ANFO vs emulsion for the spoke detail. This hub stays the buyer page for gear pump for explosives and emulsion explosives pump intent.
Stainless steel for ammonium nitrate emulsions
NAPCO stainless steel pumps are the standard choice for emulsion explosive applications worldwide. The stainless housing resists corrosion from ammonium nitrate and the oxidizer components in emulsion matrices, ensuring long service life even in continuous-duty applications.
Gear options include nitrile rubber (standard, rated to 240°F) for most emulsion applications, and Viton gears for higher-temperature or chemically aggressive formulations. Both materials provide excellent wear resistance against the abrasive particles common in bulk emulsion and matrix blends.
Replacing Bowie, Mono, NOV, or Roper on plant transfer
Many plants already run a Bowie, Mono, NOV, or Roper pump on emulsion transfer and need a stainless rotary gear option with kits on the shelf.
NAPCO is a direct-fit path for plant and surface transfer when you want fewer wear parts than a progressive cavity stator and a factory-matched rebuild kit. Match port size first (3-inch PA300S for high volume; 2-inch PA200S for smaller lines), then nitrile or Viton gears from the fluid. For SKU buyers, start at PA300S or PK300S. This page is not a borehole PCP replacement claim.
Recommended Pumps for Emulsion Explosive Transfer
PA300S — 3″ Stainless Steel
High-capacity pump for bulk emulsion transfer, matrix loading, and large-volume mine site operations.
| 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-volume emulsion transfer, mobile mixing units (MMUs), and auxiliary pumping applications.
| Max Flow | 69 GPM @ 190 RPM |
| Max Pressure | 100 PSI |
| Housing | Stainless Steel |
| Gears | Nitrile or Viton |
| Weight | 114 lbs |
Explosives & Mining Applications
- —Bulk emulsion transfer — Loading and unloading emulsion explosives between storage tanks, mobile mixing units, and charging equipment.
- —Ammonium nitrate emulsion pumping — Handling the viscous oxidizer-in-oil emulsion matrix used in commercial blasting operations.
- —Mobile mixing unit (MMU) surface transfer — Compact enough for truck-mounted plant and surface load/unload when the duty is low-pressure transfer — not borehole PCP injection.
- —Matrix manufacturing — Continuous-duty pumping during emulsion production, where consistent flow is essential for product quality.
- —Mine site pump-over systems — Transferring bulk emulsion at surface-level storage facilities before distribution to underground or open-pit operations.
Gear Pump vs. Progressive Cavity Pump for Emulsion Explosives
Gear pumps fit plant and surface transfer. Progressive cavity pumps remain common for high-pressure injection when that is the duty. Rotary gear pumps offer fewer moving parts and simpler field rebuilds for zero-pressure and low-pressure bulk emulsion handling. See gear pumps vs progressive cavity pumps.
| Factor | Rotary Gear Pump | Progressive Cavity Pump |
|---|---|---|
| Moving Parts | Two gears, simple design | Rotor + stator, complex geometry |
| Field Rebuild | Drop-in repair kit, no alignment | Stator replacement, rotor alignment required |
| Self-Priming | Yes — inherent design | Limited — requires flooded suction in many configurations |
| Bi-Directional | Yes — CW/CCW from motor | No — single direction only |
| Dry-Run Tolerance | Better — rubber gears tolerate brief dry conditions | Poor — stator damage from dry running |
| Cost | Lower purchase and rebuild cost | Higher — stators are expensive consumables |
| Best Application | Zero-pressure and low-pressure transfer, loading/unloading | High-pressure pumping to depth, metering |
Trusted by Explosives Manufacturers Worldwide
NAPCO pumps are used in mining and explosives manufacturing operations across North America, South America, Australia, Asia, and Europe. Our global distributor network provides local support, parts availability, and field service in every major mining region.
Every NAPCO pump ships with factory-matched repair kits available for immediate ordering — ensuring that routine maintenance at remote mine sites can be performed quickly by on-site technicians without waiting for factory service.
Related Technical Resources
Rotary Pumps for Explosives & Mining
In-depth application guide for emulsion explosive transfer and mining operations worldwide.
Pumping Ammonium Nitrate & ANFO
Which AN products can be pumped, why stainless steel is required, and how to spec the transfer system.
Bulk Emulsion Products
Types, delivery models, and which grades are pumpable.
Cartridge Emulsion Explosives
Packaged product is hand-loaded. Stainless gear pumps move bulk matrix.
ANFO vs Emulsion
Dry prill vs pumpable matrix. Only the emulsion side is a pumping job.
Bulk Emulsion Trucks & MMUs
Gear pump selection for truck loading skids and surface transfer on mobile mixing units.
Bulk Plant Rebuild Case Study
How on-site PA300S rebuilds beat replacement lead time during peak loading season.
Gear Pump Cavitation Guide
Understand cavitation causes, symptoms, and prevention strategies for reliable operation at mining sites.
Stainless Steel vs. Ductile Iron Pumps
Material selection guide for pump housing — which construction is right for your application.
Gear Pumps vs Progressive Cavity
Transfer vs high-pressure injection — when each pump type fits emulsion duty.
Rotary Gear Pump Working Principle
How the gears move fluid — the same platform behind PA300S and PA200S.
Gear Pump Service Kits
Factory-matched rebuild kits for field service at plant and mine sites.
Explosives & mining FAQs
Why stainless for emulsion explosive transfer?
Stainless housings resist corrosion from ammonium nitrate and oxidizer components in emulsion matrices. That is why PA300S and PA200S are the standard NAPCO picks for emulsion duty.
What flow does PA300S deliver?
PA300S delivers up to 158 GPM at 280 RPM, 100 PSI max. Use it for high-volume bulk emulsion and matrix transfer.
Can NAPCO pumps run on mobile mixing units?
PA200S fits compact plant and truck-mounted surface transfer when the duty is low-pressure load and unload. NAPCO does not claim borehole PCP injection.
Gear pump or progressive cavity for emulsion explosives?
Gear pumps have fewer moving parts, no stator wear, and simpler field rebuilds. They fit zero-pressure and low-pressure plant transfer. Progressive cavity pumps remain common for high-pressure injection. See the comparison page.
Looking for a Bowie, Mono, NOV, or Roper alternative?
For plant emulsion transfer, start with stainless PA300S or PA200S and a matching repair kit. Port size and gear material follow the line and the fluid. Contact NAPCO for fit against your current pump.
Lead time?
Standard lead time is 6 to 8 weeks from order to shipment. Repair kits ship faster when in stock.
Need a pump for emulsion explosive transfer?
Tell us about your application — flow rate, viscosity, pressure requirements — and we’ll recommend the right NAPCO pump for the job.