The double-suction arrangement provides for greater flow and is less prone to material “coning” typically observed with bottom-only intake. An added benefit of double-sided impellers is reduced axial bearing loads. The impellers are open-type for large particle passage and delivers efficient flow and even wear throughout the life cycle of the part.
This results in uniform wear, longer wear life of wet-end parts and sustained high efficiency. Several types of hard metal and moulded elastomer impellers are interchangeable. Impeller threads are cast-in, eliminating the need for impeller inserts or nuts.
Casings are ultra-thick cast or ductile iron and incorporates the discharge neck to eliminate a major failure point of some other vertical pump designs.
The cantilever design has no submerged bearings and shaft sleeves for ease of maintenance and protection against water ingress while eliminating the complexity of mechanical seals. The oversized bearing types are double-row taper thrust (lower) and cylindrical roller (upper) to mitigate against damaging vibrations and are grease-purged for protection against dirt.
The shaft is similarly oversized and made of high-strength alloy steel to reduce deflection, increase bearing life and allow for higher critical speeds.
Interchangeable Submersible Parts
Hard metal submersible parts are interchangeable with pressure molded elastomers, such as the impeller and bottom strainers. All submerged metal parts are coated with a cured rubber for corrosive applications in our HVR range.
SPS Application Engineers are experienced to recommend the ideal wet end materials for your application.
Cartridge : Type Shaft and Bearing Assembly
The cartridge arrangement allows servicing in a clean environment without removing the pump. A large diameter shaft with short overhang minimizes deflection and vibration. Heavy-duty, grease-lubricated cylindrical and/or taper roller bearings are enclosed in a cartridge-type housing protected at both ends by a rotating labyrinth, double piston rings and grease purged lip-seal. Where drive power exceeds the maximum power rating of the standard bearing assembly, double-bearing cartridge assemblies provide greater power handling.
A reversible, slip-fit, stainless steel shaft sleeve, through hardened with O-rings at both ends completely protects the shaft. Tungsten coated shaft sleeves are offered for ultra-demanding applications.
An optional agitator arrangement prevents sump silting with settling slurries. A bottom suction extension can be specified for pumping out deep-set pits and sumps. In applications where contact may cause damage or degradation of the medium (e.g. carbon transfer duty) a recessed vortex impeller is used. HV and HVR pumps can be tank-mounted for self-contained operation.
Pump Mounting Plate
A rigid, one-piece casting cradles the bearing assembly. Only four bolts are required to hold the bearing assembly on the mouting plate. An easy means of external impeller adjustment is provided in a convenient position below the bearing housing. The complete pumpset is held in place by 4 bolts on the mounting plate.