Technical Library

Resources & Technical Guides

Technical guides, pump selection resources, and engineering articles for industrial fluid transfer. Everything you need to make informed decisions for your applications.

33 Guides5 Categories4 Posts

Pump Technology

Essential reading for understanding rotary gear pump technology, how it works, and how it compares to other pump types.

Rotary Gear Pump

NAPCO rotary gear pumps. External gear, 2" and 3". How they move fluid, where they fit, and which pump to order.

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Rotary Gear Pump vs. Centrifugal Pump

Side-by-side comparison of positive displacement gear pumps and centrifugal pumps — performance, viscosity handling, efficiency, and when to use each

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Positive Displacement Pump Comparison

Gear pumps vs. vane pumps vs. piston pumps — a technical comparison of operating principles, flow characteristics, and best applications for each type

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Pump Selection Guides

Comprehensive guides for selecting the right pump technology and sizing for your application.

Gear Pumps vs. Progressive Cavity Pumps

Cross-vertical comparison of pump technologies for industrial applications

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How to Size a Rotary Gear Pump

Step-by-step pump sizing guide with flow, pressure, and viscosity considerations

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How to Order NAPCO Gear Pumps & Kits

Lead times, payment terms, freight, and quote checklist for direct pump and kit orders

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PA200S Stainless Steel Gear Pump: Spec Guide

Specifications, applications, and selection guidance for the 2″ stainless steel PA200S

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Material & Construction

Technical guides for selecting the right materials and construction for your environment.

Nitrile vs. Viton Gears: Material Selection Guide

When to use each gear material based on chemical compatibility and temperature

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Stainless Steel vs. Ductile Iron Pumps

Housing material selection for different applications and environments

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Ductile Iron Gear Pumps for Industrial Fluid Transfer

Metallurgy, best-fit fluids, PA200C vs. PA300C selection, and how they differ from hydraulic gear pumps

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Industry Applications

Specialized guides for pump selection in specific industrial sectors.

Pump Selection for Emulsion Explosives

Technical guide for mining and explosives industry pump requirements

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Pumping Ammonium Nitrate Emulsion & ANFO

Which AN products can be pumped, why stainless steel is required, and pump selection for emulsion matrix and AN solution transfer

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Bulk Emulsion Products: Types, Delivery, and Transfer

Matrix, SME, Heavy ANFO, and gassed grades — what they are, how they are delivered, and which ones can be pumped.

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Cartridge Emulsion Explosives

Packaged product is hand-loaded; stainless gear pumps move bulk matrix.

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ANFO vs Emulsion

ANFO is dry prill plus fuel oil. Emulsion is a pumpable matrix. Only the emulsion side is a pumping job.

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Gear Pumps for Bulk Emulsion Trucks & MMUs

Stainless gear pump selection for truck loading, plant pump-over, and MMU surface transfer — PA200S vs PA300S

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Gear Pump for Paint Transfer

Plant transfer of latex, enamel, polyurethane, coatings, and inks. Housing, gears, PA300C and PA200C.

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Adhesive Pump

Plant transfer of adhesives and sealants. Drum, tote, tank, load-out. PA300C / PA200C.

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High-Viscosity Adhesive Pump Guide

Pumping solutions for adhesives, sealants, and resin-based materials

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Chemical Resistant Gear Pump

Stainless PA300S / PA200S for solvents, dilute acids, and fluids that attack iron. Nitrile or Viton gears.

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Gear Pumps for Chemical Transfer

Chemical processing pump selection and material compatibility

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Gear Pumps for Fuel & Petroleum Transfer

Petroleum terminal and fuel handling pump solutions

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Food Grade Gear Pump

Stainless PA200S and PA300S for plant transfer of oils, syrups, flavorings, and chocolate.

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Stainless Steel Gear Pumps for Food Processing

Material selection, sanitation, and best practices for food and beverage applications

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Rotary Gear Pumps for Explosives & Mining

Application guide for emulsion explosives transfer, sensitizer dosing, and mining process fluids with rotary gear pump technology

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High-Viscosity Pump Selection for Adhesives

How to select and size rotary gear pumps for adhesives, sealants, resins, and other high-viscosity materials up to 1,000,000 cP

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Maintenance & Service

Expert guidance on maintenance, repair, and field service best practices.

How to Rebuild a Rotary Gear Pump: PA200 & PA300 Guide

Step-by-step field rebuild of NAPCO PA200 and PA300 pumps — repair kit contents, tools, the 12-step procedure, gear clearance, and torque specs

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Rotary Gear Pump Maintenance Schedule & Checklist

Comprehensive maintenance schedules and checklists for daily, weekly, monthly, quarterly, and annual pump inspection and service intervals

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Field Maintenance for Rotary Gear Pumps

Maintenance schedules, repair kits, and field service best practices

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Pump Repair Kits vs. Full Replacement

Cost analysis, downtime comparison, and decision framework for rebuild versus replace

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Gear Pump Cavitation: Causes, Symptoms & Prevention

How to identify, troubleshoot, and prevent cavitation in rotary gear pumps — covering NPSH, inlet conditions, and system design

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Gear Pump Troubleshooting Guide

Diagnose and fix the eight most common gear pump problems: no flow, low pressure, excessive noise, seal leaks, overheating, vibration, and motor overload

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More guides

What Is a Rotary Gear Pump?

Complete guide to rotary gear pumps — how they work, external vs. internal designs, key components, applications, and selection criteria.

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Blog

Technical articles from the NAPCO blog.

Gear Pump vs. Centrifugal Pump — Which Is Right?

Compare gear pumps and centrifugal pumps: key differences in flow type, viscosity handling, self-priming, and total cost of ownership.

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Rotary Gear Pump 101: The Complete Beginner’s Guide

Everything you need to know about rotary gear pumps — how they work, components, applications, and why they’re ideal for viscous and abrasive fluid transfer.

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5 Signs Your Gear Pump Needs a Rebuild

Five warning signs your rotary gear pump needs a rebuild — reduced flow, increased noise, visible leaks, excessive vibration, and rising motor current.

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Rebuild vs. Replace — Total Cost of Pump Ownership

Economic analysis of gear pump rebuild vs. replacement. Learn when to rebuild, when to replace, and how field rebuilds save money over pump lifetime.

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Need expert guidance?

Our engineering team is ready to help you select the right pump for your specific application.

Contact NAPCO Engineering