ANSI is a short form used to describe the American National Institute Pump Standard. This standard evolved from the American Voluntary Standard (AVS) that was first anticipated by the Manufacturing Chemists Association in the year1950.

1. Standard Features of ANSI pumps
ANSI is a short form used to describe the American National Institute Pump Standard.
This standard evolved from the American Voluntary Standard (AVS) that was first
anticipated by the Manufacturing Chemists Association in the year1950. It is a set of
inch dimensional standards that describe the envelope dimensions of a back pull out, of
centrifugal pump.
The centrifugal pump which is designed to ANSI B73.1 standards is known as ANSI
pump. This pump features a vertical center line discharge, foot mounted casing to cover
and frame bolted with quick release bolt lugs to facilitate back pull out disassembly
without any disruption to sustain or to the discharge piping. The choice is giving by
manufacturer with open impellers for the handling of solids, or enclosed impellers for
increased pump’s efficiency. The ANSI pumps generally are packed or mechanically
sealed and are designed for low NPSHr characteristics and relatively low radial thrust.
However, ANSI pump standard has gone through several changes. It was originally
adopted and there is lots of talk about combining it with the present API standard to
create a single standard for centrifugal pumps in the United States.
And , If want to purchase then you can contact Ruhrpumpen a worldwide pumping
manufactured CPP line pump is designed to meet and exceed the ANSI standard B73.1
specification. , They are designed around a single, basic hydraulic and mechanical
design which totally assures the greatest efficiencies across the broad ability to handle
any operating conditions, maximum application flexibility and very wide and superior
interchangeability.

2. Article source:http://pumpssuppliers.blogspot.in/2013/11/standard-features-of-ansi-pumps.html