Engineering & Performance Data
Pump Performance Data
The following pump data was tested with water (specific gravity 1.0). Higher viscosity liquid products may require a lower pump RPM to achieve the desired GPM and discharge pressures.
2” Pump
| Pump RPM | Discharge Pressure | GPM | Brake HP |
| 190 | 10 | 69 | .65 |
| 190 | 30 | 65 | 1.8 |
| 190 | 50 | 64 | 3.2 |
| 190 | 70 | 62 | 4.0 |
| 190 | 100 | 60 | 5.7 |
3” Pump
| Pump RPM | Discharge Pressure | GPM | Brake HP |
| 280 | 10 | 158 | 1.5 |
| 280 | 30 | 147 | 4.2 |
| 280 | 50 | 145 | 6.9 |
| 280 | 70 | 142 | 9.4 |
| 280 | 100 | 140 | 13.4 |
Pump Materials and Composition
NAPCO rotary gear pumps are available in ductile iron and 316 stainless steel and come standard with high temperature nitrile rubber gears good for operating temperatures up to 240 degrees Fahrenheit. Where higher temperatures or corrosive fluid conditions are to be encountered, NAPCO can work with its customers to provide gear material out of various metals and elastomers, such as neoprene, EPDM, urethane and viton. Please check with NAPCO or your local distributor as to the suitable gear and pump case for your particular product application. For further information on the material composition of NAPCO pump parts, see Section “Pump Materials and Composition” below.
| Material | Shaft | Impeller | Housing | Gasket | High Pressure Seal | Low Pressure Seal | Bearings |
| Ductile Iron | Alloy Steel | Nitrile Rubber | Carbon Steel | Asbestos-free paper | Viton | Viton | Chrome Needle |
| 316 Stainless | 440C Stainless | Nitrile Rubber | 316 Stainless | Asbestos-free paper | Viton | Viton | Chrome Needle |
Pump Dimensional Data
| A | B | C | D | E | F | G | H | I | J | K | L | |
| 2″ | 4.25 | 6.25 | 8.38 | 12.75 | 6.63 | 3.63 | 4.5 | 2.0 | 4.0 | 12.0 | 1.125 | 4.50 |
| 3″ | 4.37 | 6.25 | 8.38 | 12.75 | 6.63 | 3.63 | 4.5 | 1.187 | 6.0 | 14.0 | 1.125 |
4.50 |
NAPCO Pump Parts and Identification Chart