XYLEM A-C Custom Pump Vertical column pumps

Design flexibility to meet project requirements

Semi-enclosed and enclosed impeller options are available in single- and multi-stage configurations to cover a wide range of operating conditions. (Semi-enclosed impeller models include WCA, WCAX, WCB, WCF and YDD. Enclosed impeller models include WMCC and WMCE.)

The driver is mounted directly above the pump to save on floor space and reduce station footprint.

Additional options for these customizable pumps include:

• Above-floor or below-floor discharge configurations, or in two-floor installations, with thrust bearings in the pump or motor
• Open line shaft for process lubricated applications, or enclosed line shaft for pumpage containing sand or silt
• Different metallurgies, including various cast irons and stainless steels to meet application-specific requirements
• Flexible net positive suction head (NPSH)

Robust construction

The heavy-duty construction, cast bowl components and conservative mechanical design minimize vibration for these high-capacity pumps.

• The heavy-duty driver pedestal has openings to provide access to the pump coupling and stuffing box
• The stuffing box is packed with graphite-impregnated PTFE material to reduce resistance and prolong shaft sleeve life. An easily accessible split gland simplifies packing adjustment and replacement
• A shaft tube protects the shaft from the pumped fluid and provides a passage for bearing lubrication. One end of the shaft tube is provided with an O-ring sliding fit to allow for thermal expansion and ease of disassembly and reinstallation. Pumps can also be provided without shaft tubes (open line shafting) for self-lubricated applications
• The intermediate coupling (when required) uses a solid sleeve design to provide a rigid transmission of power and torque through the shafts. The coupling is positively driven via coupling keys and transmits thrust loads via the split thrust ring design
• Upper and lower bearings are rigidly mounted from the top of the pump and diffuser. The impeller is overhung from the diffuser bearing, offering increased efficiency and a reduced chance of clogging. Bearing spacing is conservatively designed using a lateral critical speed analysis
• Intermediate bearings (when required) are installed and supported via the bearing spiders which are fitted to the column pipe
• Shaft sleeves are provided at all bearing locations and the stuffing box to prevent shaft wear. Hardened alloy material extends service life
• Single suction and mixed flow impellers are cast in a single piece and balanced to ISO/ANSI G2.5 quality
• Impeller cone is a separately cast component of same material as the impeller for long wear life and reduced downtime

Maintenance-friendly removable rotating element

A-C Custom Pump column pumps with semi-enclosed impellers are available with a pull-out rotating element. The pull-out design substantially reduces maintenance and downtime costs by allowing removal of the inner element without disturbing the suction bell, column pipes, discharge elbow and discharge piping.

Column size for a given capacity is not affected by this pull-out design, and there is no sacrifice in pumping performance. The sliding and conical fits ensure proper alignment upon reassembly.

The inner element is completely removable through the top of the pump, thus eliminating the need to drain or enter the sump during maintenance. When the time comes to restore system efficiency, simply replace the wear components and your pump is ready for many more years of reliable performance.

A-C Custom Pump column pump applications

Our vertical column pumps are commonly used in:

• Power generation circulating water and cooling towers
• Municipal water & wastewater
• General industry
• Irrigation
• Stormwater and flood control

Expertise you can rely on

A-C Custom Pump has more than 150 years of expertise in the design and manufacture of pumps and pumping systems. Building on the legacy of Allis-Chalmers Co. and ITT A-C, our pumps continue to provide superior efficiency and reliability in custom solutions. Our reference list, on-time delivery, installation and service support, and equipment performance has earned us a reputation for reliability around the world. And with our full-scale testing capabilities, the performance of each pump can be accurately certified before it leaves our facility.