National Pump Company Vertical Turbine Pumps - Close Coupled
National Pump Company offers an extensive range of close-coupled vertical turbine pumps designed for both sump and pressure-boosting applications. Our pumps are operational globally, serving diverse applications such as municipal water provision, mining, petroleum, desalination, snowmaking, cooling towers, and industrial processes. Features include:
- Sizes: 6” to 30”
- Hydraulic System: Standard or Thrust Balanced designs
- Flow Rate: Up to 25,000 GPM
- Maximum Head: Up to 2,500 feet
- Power: Up to 2,000 HP
- Discharge Heads: Cast Iron, Ductile Iron, or Fabricated Steel
- Construction Materials: Cast Iron, Ductile Iron, Silicon, Aluminum, 304, 316, and Duplex Stainless Steel
- Lubrication: Water, Product, or Oil Lubricated line shaft
- Column Construction: Threaded or Flanged
- Seals: Packing or Mechanical
- Certifications: ISO 9001 Quality Management System, NSF61 & 372 Pump Certification (if specified)
- Testing: Compliance with Hydraulic Institute standards
All pump models are stocked in standard materials of construction and can be customized to meet your exact specifications at our various manufacturing locations.
Vertical Turbine Pumps - Commonly Asked Questions
When Should I consider using a submersible turbine pump versus a vertical lineshaft turbine pump?
Guidelines on when to use a Submersible Pump versus a Vertical Turbine Pump:
- When shaft elongation problems occur on a deep Vertical Turbine pump setting.
- When wells are not straight.
- In open sumps where flooding can be a threat to surface mounted motors.
- Where space is at a minimum or where appearance or noise prohibits surface installations.
- In an In-Pipe Booster application mounted in a horizontal, vertical or inclined position.
Does National Pump have NSF 61 certification?
As of September 20, 2019, National Pump has NSF/ANSI/CAN 61 & NSF/ANSI 372 certification for Vertical and Submersible Turbine Pump assemblies. The deep-set Vertical Turbine Pumps are available in configurations that include either oil-lubricated or fresh water flushed enclosed lineshaft or pre-lubricated open line shaft. The short-set Vertical Turbine Pumps are available in either product lubricated or enclosed linshaft configurations. NPC has certified many optional materials to allow our customers the ability to choose the best materials for their specific application. Whether its standard materials, stainless steel or aluminum bronze, we can meet your needs. Bearings options also include bronze, neoprene, marine or vesconite. Wear rings are available in stainless steel or aluminum bronze. Seal options include mechanical seals in split or single cartridge configurations or expanded PTFE yarn packing. Standard coating is Tnemec N-140 Pota-Pox Plus to provide long-lasting protection of the steel components. The complete pump, from the suction to the discharge, is certified to pump drinking water without imparting chemical contaminants or impurities that can affect our health.
What materials are available from National?
National Pump manufactures pumps in a variety of materials to meet our customer’s preference or needs. Bowls and Impellers are available in Cast or Ductile Iron, Cast Steel, Stainless Steel, a variety of Bronzes or Duplex Stainless Steels. Bearing materials are available in Bronze, Marine rubber, and engineered composites.
Can I use a Motor and VFD on a Cast Discharge Head?
When using a cast iron discharge head, National Pump Company can only guarantee vibration free operation at full load speed. A cast iron discharge head may be acceptable for operating at reduced speeds if precautions are made by locking-out the operating speed(s) on the VFD IF vibration is experienced from the natural resonant frequency of the motor and discharge head structure. In some cases, modifications can be made to the discharge head to change the resonate frequency of the structure.
Do you have any installation suggestions on leveling the Pump?
Yes, this info is available in our IOM Manual located on our web site. The preferred levelness is dead level, however, an acceptable tolerance is 0.002 inch per foot. For deep well applications, the leveling of the discharge head is often installed to fit the well straightness, which may exceed the 0.002 inch per foot guidelines.
Does National Pump stock Stainless Steel impellers?
Yes, National Pump stocks both 304 & 316 grade stainless steel impellers, up through 15” designs with no performance corrections.
Is National Pump certified to the ISO 9001:2015 QMS standard?
Yes, all pumps that are required to be built by a manufacturer certified to ISO9001 will be manufactured at National Pump’s plant in Glendale, AZ which is certified by NQA to meeting the ISO 9001:2015 QMS Standard.
What is NPSHR (Net Positive Suction Head Required) mean on the performance curve?
NPSHR is the minimum pressure required at the first impeller of the pump to keep the pump from cavitating (i.e. turning water to water vapor in the pump). This differs from NPSHA (available) which is the absolute pressure at the pump suction. Both values are represented in ‘feet’ of pressure. NPSHA must be a minimum of 3 feet more than NPSHR.
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