CENTRIFUGAL PUMPS- COMPARISON OF API AND ANSI PUMP STANDARDS
Comparison of API and ANSI Pump Standards
| API-610 | ANSI B73.1 | |
| Pressure Rating | - All pressures and temperatures normally encountered | - ANSI Class 150 and temperatures up to 500F |
| Pump Casings | - ASME Section VIII, Div. 1 - Carbon or alloy steel required in flammable or toxis service |
- Ductile iron, carbon steel or alloy steel required for flammable or toxic service |
| Impellers | - Single piece castings
- Secured to shaft with a key |
- May be keyed or threaded to shaft |
| Wear Rings | - Minimum hardness of 400 BHN or hardness difference of 50 | - No requirements |
| Mechanical Seals | - Required | - No requirements |
| Shaft Critical Speed | - Lateral critical speed greater than 120% of maximum pump speed | - No requirements |
| Bearings | - Three-year life for ball bearings
- Hydrodynamic and thrust bearings where: bearing diameter (mm) x pump rpm >300,000 or, pump rated HP x pump rpm > 2.7 x 10^6 |
- Two-year life for ball bearings |
| Baseplates | - Drip lip or drain pan required
- Adequate to limit shaft dispacement at coupling to in |
- No requirements |
| Testing | - Hydrostatic test to 1.5 times allowable casing pressure for 30 minutes
- Performance test required |
- Hydrostatic test to 1.5 times allowable casing pressure for 10 minutes |