NSC Single-Stage Duplex Pump

 Impeller

• Computer-optimized double-sided impellers
• Minimum axial load due to the double-sided impeller
• Static and dynamic balance of the impeller according to ISO1940
• Additional wear rings of the impeller
• New highly efficient guide vane with excellent hydraulic parameters 

Shaft

• An extra strong shaft completely saved against pumped fluid, that avoids its corrosion
• Short, bend-proof and vibration-resistant shaft
• Wear shaft sleeves
• A thread is unaffected by pumped medium, that ensures a long service life and stainlessness
• Installation without adjustable washers
• Easy and fast assembly/disassembly of rotor details due to installation on bearing supports
• Maximum interchangeability of shafts – for models with 2900 rpm and 1450 rpm, six shafts and six bearing assemblies in total 

Seal assembly

• Gland seal asbestos-free intended to be used in the water supply system
• Unbalanced end seal according to DIN24960 standard
• Balanced end seal for working pressure >16 Bar, upon customer request
• End cartridge type seal, upon customer request. 

Bearing

• Enclosed bearings SKF with consistant lubricant for the whole life period
• Unenclosed gland seal, there is enough space for maintenance
• Optionally: oil lubrication using a special-purpose oilfeeder. 

Casing

• The longitudinally split casing allowing removal of the whole rotor without casing and motor displacement
• A short distance between bearings
• Casing tightness due to tight flange connection with long and prestressed bolts
• Rotor reverse rotation without replacement of parts is allowable
• The casing with double sided volute reduces radial force on the impeller and bearing load
• Easy-to-install self-centering upper part of the casing
• Sizes of connecting flanges are according ISO, DIN, BS or ANSI standards
• Polished inside surface and epoxy coating, upon customer request
• Changeable split rings are protected the casing and allow an optimum clearance between impeller
• High volume supply and exclusive suction head
• Pressure casing is designed for high working pressure. 

Materials

Casing

• Cast iron
• Corrosion-resistant cast iron “Niresist”
• High-strength cast iron
• Carbon steel
• Special stainless steel. 

Impeller

• Cast iron
• Corrosion-resistant cast iron “Niresist”
• High-strength cast iron
• Bronze
• Stainless steel
• Special stainless steel. 

Shaft

• Chrome-plated steel
• Stainless steel. 

Wear ring

• Cast iron
• Corrosion-resistant cast iron “Niresist”
• High-strength cast iron
• Bronze
• Stainless steel