Generic selectors
Exact matches only
Search in title
Search in content
Post Type Selectors

Theory Bites: Suction Specific Speed

Engineering & Design
Theory Bites- SUCTION SPECIFIC SPEED

Theory Bites: Suction Specific Speed

Theory bites is a collection of basic hydraulic theory and will touch upon pump design and other areas of pump industry knowledge.

Suction Specific Speed – Nss – can be useful when evaluating the operating conditions on the suction side of pumps. Suction Specific Speed is used to determine what pump geometry – radial, mixed flow or axial – to select for a stable and reliable operation with max efficiency without cavitation.

NSS can also be used to estimate safe operating ranges.

Suction Specific Speed can be compared with Specific Speed but instead of using the total head for the pump, the Required Net Positive Suction Head (NPSHr) is used.

Nss have the same value for geometrically similar pumps. As a rule of thumb, the Specific Suction Speed should be below 9000 (calculated with US GPM) to avoid cavitation and unstable and unreliable operations.

Empirical studies indicate that safe operating ranges from Best Efficiency Points (BEP) are more narrow at higher Suction Specific Speeds.

Read Theory Bites: Pump Specific Speed!

Related Articles

Engineers Week 2023

Engineers Week 2023

Engineers play a pivotal role in our everyday lives and they deserve recognition. We are thankful to have many outlets…

Related Whitepapers

Expansion Joint Expertise Improves Industrial Wastewater System Reliability

The majority of industries have wastewater treatment plants. Government agencies and local governments require these facilities to meet pretreatment requirements. Pretreatment rules were enacted to prevent…

How to Decrease Oil Changes with Bearing Isolators [Inforgraphic]

Learning how to decrease oil changes can be time- and money-saving. Oil life can be long if contamination is eliminated, which is easier said than…

Synchronous Machines Are The Optimal Choice For Heavy Industry

TECO-Westinghouse experience assures superior performance and reliability For over a century, Westinghouse has been the pacesetter in the design and production of electric machines for heavy…

Why FLEXXORs Are Designed Differently

J. Hilbert Anderson, President of Coupling Corporation of America, discusses some of the reasons why FLEXXORs are designed differently from all other flexible couplings, and…

Comments

Leave a Reply

Your email address will not be published. Required fields are marked *

Join the #PumpTalk Community


By submitting this form, you are consenting to receive marketing emails from: Empowering Pumps & Equipment, 2205-C 7th Street, Tuscaloosa, AL, 35401, http://www.empoweringpumps.com. You can revoke your consent to receive emails at any time by using the SafeUnsubscribe® link, found at the bottom of every email. Emails are serviced by Constant Contact