COMPARISON OF API AND ANSI PUMP STANDARDS

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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

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Phone

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