HMM Horizontal Multistage Splitcase

The HMM multistage splitcase pumps are used in a variety of commercial & industrial applications where high temperature and high pressure are present.  HMM pumps are industry leading from a feature & benefits standpoint and are specifically designed for the boiler feed markets.  This heavy wall, radial, enclosed, investment cast 304 stainless steel impeller design provides a very broad operating range.  These two-stage split case pumps also feature opposed, hydraulically balanced rotor designs eliminating the need for expensive balancing drums.  These heavy duty multistage split case pumps feature double row inboard and duplex angular contact outboard bearings standard.  Each bearing housing has a 360º, circumferential cooling jacket standard to uniformly cool the entire outer race of each bearing.  Ring oiled bearing lubrication is also standard as operating temperatures of the HMM product line can exceed 500ºF.  Each model features 400# cast dimensional flanges and 420 stainless steel shafting.  These industry exclusive features makes this product adaptable for the building trades and HVAC applications.
HMM Horizontal Multistage Splitcase

Flow & Pressure Characteristics

Flows To: 5,300 GPM (1,203 m³/hr)
Heads To:  1,200 Feet (366 m)
Temperatures To:  500ºF (270ºC)
Speed Ranges:  3000 RPM To 3600 RPM

Size Range

5×6-12 (125/30) – 8×10-26 (200/66)

Features & Benefits

  • Cast iron casing/investment cast 304 stainless steel impellers
  • Standard ring oil lubrication with 360º circumferential cooling jackets
  • Modular, removable bearing housings
  • Standard bearing isolators
  • Fully removable rotor assembly
  • Hydraulically opposed impeller orientation
  • Multi-vane, enclosed, high efficiency impeller with broad band efficiency
  • Investment cast 304 stainless steel, tongue & groove stage pieces
  • Bronze, impeller wear rings standard
  • Bronze, tongue & groove throat bushings standard
  • Bronze, tongue & groove fit, case wear rings offer superior pressure boundary protection
  • 400# suction/400# or discharge flange drilled & tapped for easy connection to system piping
  • Drilled & tapped suction & discharge flanges for easy connection to system piping
  • Suction & discharge gauge connections standard
  • Turned, ground and polished 420 stainless steel shaft standard
  • Heavy duty, 304 stainless steel shaft sleeves with separate shaft sleeve nuts
  • Packing standard with optional component and/or cartridge mechanical seals available
  • Double row inboard and duplex angular contact outboard bearing
  • 50,000+ hour minimum L10 bearing life standard

Available Metallurgies

  • Cast iron, ductile iron, 304 stainless steel fitted, 316 stainless steel fitted


  • Building Trades
  • Chemical Processing
  • Food & Beverage
  • General Industry
  • Marine & Offshore
  • Mining & Aggregate
  • Power Generation
  • Oil & Gas
  • Pharmaceutical
  • Pulp & Paper
  • Water Resources