ANSI pumps refer to a set of centrifugal pumps that adhere to the standards established by the American National Standards Institute (ANSI). ANSI has defined a series of standards for pumps, including dimensions, performance criteria, and construction features, to ensure compatibility and interchangeability between pumps and their components from different manufacturers.
The most common is the ANSI pump (in the US) and an ISO pump (everywhere else). ANSI pumps are commonly used in various industries, including chemical, petrochemical, water treatment, and general industrial applications. These pumps are designed to handle a wide range of liquids, and their adherence to ANSI standards allows for easier replacement of parts and pumps from different manufacturers.
Key Points about ANSI Pumps
Dimensional Interchangeability - ANSI pump dimensions are standardized, making it easier to replace a pump or its parts without requiring modifications to the existing system.
Back Pull-Out Design - ANSI pumps often feature a back pull-out design, allowing for the removal of the pump's rotating element (impeller, shaft, and bearings) without disturbing the casing or piping.
Casing Design - ANSI pumps typically have a volute casing design, which helps in efficient fluid flow and reduces turbulence.
Materials of Construction - ANSI pumps are available in various materials of construction to suit different applications and the nature of the pumped fluid.
Shaft Seal Options - These pumps offer different options for shaft seals, including mechanical seals and packing glands, to accommodate diverse sealing requirements.
Flange Standards: ANSI pumps use standard flange dimensions, facilitating easy integration into existing piping systems.
The ANSI pump standards provide a framework for manufacturers to produce pumps that meet certain criteria, making it simpler for end-users to select and maintain pumps for their specific needs. It's worth noting that while ANSI pumps are widely used, other pump standards, such as API (American Petroleum Institute) standards, may also be applicable in certain industries and applications.
