National Vertical Turbine Pumps

National Pump equipment serves municipal water supply, irrigation, industrial cooling, and process-water applications. Vertical turbine designs move water from wells, wet pits, and other sources below the discharge elevation.

Impellers in submerged bowls add energy to the water, which travels upward through a column to the discharge head. A lineshaft connects the bowl assembly to a driver above the source.

A submersible turbine pump places its motor below the liquid level with the pumping assembly. A conventional lineshaft turbine uses an aboveground driver and a shaft extending down the column.

Yes. National offers vertical turbine products for deep wells and wet-pit installations. The source geometry, pumping level, and required performance determine the suitable bowl assembly and installation arrangement.

Additional stages generally increase the head available at a given flow for a selected bowl design. Stage count must be coordinated with motor power, shaft loading, and pressure ratings.

Provide the required flow, pumping water level, discharge pressure, piping losses, and liquid properties. Selection also requires well or pit dimensions, motor requirements, and the anticipated range of operation.

The water level during pumping can be lower than the static level. That change affects total head, available submergence, and the risk of drawing air into the intake.

Yes. National serves agricultural water applications. The selection should reflect available well yield, irrigation flow, delivery pressure, seasonal water-level changes, and the resistance of the distribution piping.

A suitable turbine pump can deliver cooling water from a basin or other source. Evaluate temperature, water quality, required flow, and the full system head at expected operating conditions.

Choose bowl, impeller, shaft, bearing, and seal materials for the water chemistry, temperature, and solids. A material suitable for fresh water may not suit saline or aggressive process water.

A compatible motor and drive may allow speed control. Confirm minimum operating speed, cooling, lubrication, resonance concerns, and the pump's allowable operating range before specifying a variable-speed system.

Adequate submergence helps limit vortices and air entry. The required depth depends on intake geometry and flow, so bowl setting should follow the manufacturer's application and installation guidance.

Follow the specific manual for lubrication, bearings, shaft alignment, couplings, seals or packing, and motor checks. Record pressure, flow, and vibration to identify changes before performance deteriorates significantly.

Possible causes include alignment problems, bearing wear, imbalance, air ingestion, or operation outside the intended range. Investigate both the equipment and source conditions rather than assuming a single worn part.

A rebuild may be practical after inspecting bowls, impellers, shafts, bearings, and the driver. Compare repair scope with replacement cost and whether current demand still matches the original selection.

Contact Industrial Air Services at (615) 641-3100 with your flow, head, water-level information, and existing nameplate. Include installation drawings when requesting a replacement or application review.