Page 320 - Centrifugal Pumps 2E

Chemical Pumps Metallic and Nonmetalllc 285

Figure 15-2. ANSI vertical in-line overhung single-stage pump with rigid cou-
pling (courtesy of ingersoll-Rand Company).

The specifications also stipulate that the pumps have centerline dis-
charge casings and should be pulled from the rear rotor design that al-
lows disassembly without disconnecting the suction or discharge nozzles.
To maximize mechanical seal life, the specifications require a .005-inch
shaft deflection limit at the impeller centerline due to dynamic deflection
and a maximum full indicator run out at the stuffing box face of .002
inches.
The specifications also require that there be a minimum bearing life of
17,500 hours due to the defined maximum imposed hydraulic loads and
that the suction and discharge flange pressure-temperature limits comply
to a minimum of ANSI B16.5 Class 150 (Figures 15-6 and 15-7).