Page 319 - Centrifugal Pumps 2E

284 Centrifugal Pumps: Design and Application

Figure 15-1. ANSI overhung single-stage pump (courtesy of Ingersoll-Rand
Company).

within a given envelope (Figure 15-3A). The ANSI B73.1M specifica-
tion has a dimensional designation of AA to A120 that covers 19 various
size pumps. Its dimensional standards not only cover the pump itself, but
also cover the pumps on bedplates. ANSI B73.2M has a dimensional des-
ignation of 2015 to 6040 that covers 15 various size pumps (Figure 15
3B). This dimensional standard became an important criterion for chemi-
cal plant designers because they could rely on the pump envelopes for
dimensional accuracy when laying out the piping and foundations for the
pumps. This eliminated the need for certified drawings of the pump as-
sembly or pump bedplate combination from the pump suppliers. It also
eliminated the need for extra inventory for spare parts because spare
pumps could be purchased from various pump manufacturers with the
assurance that they would fit into an existing piping system.
The hydraulic range of these pumps at a synchronous speed of 3600
RPM is 2000 gallons per minute and over 800 feet. At 1800 synchronous
speed, the range is from 3500 gallons per minute to 250 feet (Figures
15-4 and 15-5).