Submersible Turbine Pumps

Yes, National Pump stocks both 304 & 316 grade stainless steel impellers, up through 15” designs with NO performance corrections.

Yes, 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.

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.

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.

Normally catalog performance and efficiencies are ‘best obtainable’ performance derived from testing using standard materials of construction (i.e. Cast Iron Enameled lined bowls & Bronze impellers) with backfilled and highly polished impellers. Any material change or use of a ‘standard’ polish, may reduce pump performance. The Hydraulic Institute sets performance standards and test tolerances for what a manufacturer can or cannot provide. These standards range from – 9% to +16% deviation on Flow, – 7% to +10% on Head, -7% to 0% on efficiency. When specifying a pump, it is important to define early on what your expectations are so that the manufacturer can meet those expectations. Call a National Pump Representative to learn more about the Hydraulic Institute Test Tolerances.

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.

Guidelines on when to use a SUBMERSIBLE PUMP versus a Vertical Turbine Pump:

1. When shaft elongation problems occur on a deep Vertical Turbine pump setting.
2. When wells are not straight.
3. In open sumps where flooding can be a threat to surface mounted motors.
4. Where space is at a minimum or where appearance or noise prohibits surface installations.
5. In an In-Pipe Booster application mounted in a horizontal, vertical or inclined position.