Oberdorfer N13HD Series Gear Pump – Model N13HDP
The Oberdorfer N13HD Series is a rugged bronze rotary gear pump built for facilities and operators who need dependable fluid transfer without constant maintenance headaches. As a positive displacement pump, it moves a fixed volume of liquid with every shaft revolution, so flow stays consistent and predictable even as system pressure shifts. The all-bronze housing and gears pair with a 303 stainless steel shaft and self-lubricating carbon-graphite bearings, giving the pump the corrosion resistance and wear tolerance needed for years of continuous service in demanding environments.
What sets the N13HDP pump end apart is its flexibility. It ships as a bare shaft unit ready for direct drive or belt drive installation, with an outboard ball bearing support built in for belt-driven setups, and it can be fitted with an optional electric clutch in 12V, 24V, or 32V configurations. The standard packing seal arrangement is field-convertible to a lip seal or mechanical seal depending on the fluid being handled, and the pump is self-priming with up to 20 feet of suction lift, so it can pull fluid from a tank or sump without a flooded suction line.
Because it handles viscosities up to 50,000 SSU and operating temperatures from -40°F to 400°F, the N13HD Series is equally at home moving diesel fuel, oil, water, and mild chemicals across a pH range of 4 to 10. It's a common choice for fuel transfer stations, HVAC hot and chilled water loops, municipal water systems, irrigation setups, and general industrial process lines wherever a compact, serviceable gear pump is needed.
Key Features
- All-bronze castings paired with a 303 stainless steel shaft for corrosion resistance
- Self-lubricating carbon-graphite bearings requiring no external lubrication
- Field-interchangeable seal options: packing, lip seal (FKM-PTFE or NBR), or mechanical seal (NBR-ceramic, FKM-ceramic, or EPDM-ceramic)
- Self-priming design with up to 20 feet of suction lift
- Outboard ball bearing support for belt-drive applications
- Optional electric clutch available in 12V, 24V, or 32V configurations
- Positive displacement design delivers flow proportional to shaft speed, independent of back pressure
Applications
- Diesel fuel transfer and fuel oil handling
- HVAC chilled water and hot water circulation
- Municipal drinking water transfer systems
- Waste water effluent sampling
- Irrigation and sprinkler system fluid transfer
- General industrial fluid handling and process transfer
Specifications
- Port size: 1-1/2" NPT inlet and discharge
- Maximum flow rate: up to 90 GPM
- Maximum pressure: 100 PSI (water), 150 PSI (oil and lubricants)
- Maximum speed: 1,750 RPM (recommended under 900 RPM for continuous duty)
- Operating temperature range: -40°F to 400°F
- Viscosity range: up to 50,000 SSU
- Materials: bronze body and gears, 303 stainless steel shaft, carbon-graphite bearings
- Compatible fluids: water, oil, diesel fuel, and mild chemicals with a pH range of 4 to 10
FAQs
Q: What is the maximum flow rate of the Oberdorfer N13HD Series gear pump?
A: The N13HD Series can deliver flow rates up to approximately 90 GPM, depending on shaft speed and system back pressure, since flow output is directly proportional to RPM in a positive displacement design.
Q: Can the N13HDP gear pump run on a belt drive instead of direct drive?
A: Yes. The N13HDP pump end includes an outboard ball bearing support specifically designed to handle the side-loading that comes with belt-drive setups, and an optional electric clutch (12V, 24V, or 32V) can be added for clutch-engaged drive systems.
Q: What fluids is this gear pump compatible with?
A: The pump is suited for water, oil, diesel fuel, and mild chemicals within a pH range of 4 to 10, handling viscosities up to 50,000 SSU. It is not recommended for abrasive-laden liquids, which can accelerate wear on the bronze gears and bearings.
Q: Does the N13HD Series pump need to be primed before starting?
A: No. It is self-priming and can lift fluid up to 20 feet on the suction side, though a foot valve is recommended to maintain prime between operating cycles.
Q: What seal options are available for the N13HD Series pump?
A: The standard configuration uses a packing seal, but the pump end is field-convertible to a lip seal (FKM-PTFE or NBR) or a mechanical seal (NBR-ceramic, FKM-ceramic, or EPDM-ceramic) to match the specific fluid and application requirements.
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