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Primary Factors Affecting Vibration: Separation margin to structural natural frequency   Operating on the structural natural frequency of the discharge head motor assembly will result in unacceptable vibration levels. A field margin of +/-10% is recommended to ensure low vibration levels.   A structural natural frequency calculation or analysis (sometimes referred to as a reed […]

Structural natural frequency, also referred to as reed critical frequency (RCF), is the single greatest factor which prevents excessive vibration in a vertically suspended pump. Operating close to or on a structural natural frequency will result in high vibration levels. This high vibration level can result in premature or catastrophic failure of the equipment. Key […]

In times of need, ASR wells are designed to inject and recover reclaimed water into shallow aquifers for underground storage purposes. National Pump Company (NPC) has worked on various ASR projects to provide well pumps with the testing, designs, and capabilities needed to inject and/or recover water as needed. Below are various Arizona projects that […]

We offer pump training courses at our various branch locations throughout the year. For those new to the pump industry or those who just want to sharpen their skills and knowledge, our pump instructors are full of valuable information. Topics include, but are not limited to: Pump Maintenance Terms of the Trade Pump Parts and […]

National Pump Company has developed new impeller patterns specifically to pour 300 series stainless steel impellers, which now provide the same high performance and efficiency as our bronze designs. With fourteen (14) models to choose from, they are available from inventory for a quick turnaround. Flow ranges are from 200 GPM to 3,200 GPM at […]

The location that the pump operates on the pump curve can play a critical role in the design and evaluation of the pump. Hydraulic Institute (HI) standards recommend or define values based on which region the pump is operating in. The Rotodynamic (Centrifugal and Vertical) Pumps – Guideline for Allowable Operating Region (ANSI/HI 9.6.3-2012) defines […]

National Pump has what you’re looking for!  When NSF /ANSI 61-G certified product is required on your project, we will proudly display the NSF emblem on the pump bowl assembly nameplate. This NSF nameplate is confirmation that through testing, your National Pump meets and exceeds the safety standards set forth by the U.S. Safe Drinking Water […]

On display at our booth for AWWA ACE17 was the new EX-Series submersible pump. The show, which was held in Philadelphia, June 12th  – 14th drew a large crowd and many attendees stopped by our booth to look at and get first-hand information about this heavy duty submersible pump, designed for aggressive water applications. Features […]

When selecting a pump, it is extremely important to ensure that the net positive suction head available (NPSHA) is greater than the net positive suction head required (NPSHR) of the pump to prevent cavitation. NPSHA is the amount of absolute suction head available in feet of liquid at the first stage impeller datum minus the […]

National Pump Company is proud to announce our ISO 9001 standard certification renewal from ISO 9001:2008 to the new ISO 9001:2015 standard. As part of a continued focus to improve its quality management system in efforts to exceed customer expectations, National Pump Company is proud to announce that it obtained the ISO 9001:2015 certification. This […]