There was a relaxation of API 610 9th edition about ten years ago. Consequently, some customers are rightfully trying to save money on applications where API compliance was really not justified. Other people are carelessly obsessed with trying to use an ANSI pump, as an API pump. We witness more and more inexperienced engineers attempting this substitution. As grandma used to say… “You should not try to teach a pig to sing…it just upsets the pig, and is a waste of time.”
Plenty of ANSI pumps are used in hazardous and high temperature applications, so when and how do you know which to use?
Consider an API pump if:
- Liquid is flammable, toxic, hazardous or explosive
- Head (TDH) is over 375 Ft.
- Temperatures are over 350 degrees F
- Driver horsepower is over 125 BHP
- Suction pressure is over 75 PSIG
- Driver speed is over 3600 RPM
- Impeller diameter is over 13 inches
The following expression used by one company has worked well: kW x RPM
If the result is greater than 675,000, they will likely use an API pump.