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

Pump Wisdom: Chapter 5: Rolling Element Bearings

Pumps & Operations

Pump Wisdom: Chapter 5: Rolling Element Bearings

Explore key facets of centrifugal pump ownership, installation, operation, and troubleshooting

The Second Edition of Pump Wisdom: Essential Centrifugal Pump Knowledge for Operators and Specialists delivers a concise explanation of how pumps function, the design specifications that must be considered before purchasing a pump, and current best practices in lubrication and mechanical seals.

This new edition also contains new startup and surveillance tips for pump operators, as well as repair versus replacement or upgrade considerations for maintenance decision-makers, new condition monitoring guidance for centrifugal pumps, and expanded coverage of operator best practices.

Read Chapter: 4 Piping, Stationary Seals and Gasketinghere.

Radial vs. axial (thrust) bearings
In pumps designed and marketed in the United States, the radial bearing is usually configured as illustrated in Fig. 5.4, although European pump designs generally favor the higher load-rated cylindrical roller bearing.

Pump Wisdom Chapter 5

Fig. 5.3: API 610 style centrifugal pump cross-section with radial bearing circled

Higher initial cost and the need for more careful assembly are the distinguishing characteristics of cylindrical roller bearings as compared to typical ball bearings. Regardless of bearing style, the bearing in the radial location should be free to move axially, whereas the outer rings of a thrust bearing assembly should be restrained in place. However, applying an excessive clamping force would risk distorting or buckling the outer ring. Allowing the thrust bearing set to axially move as much as 0.002 in (0.05 mm) ensures there is no unduly large clamping force.

Pump Wisdom Chapter 5

Fig. 5.4: Nomenclature for a typical radial ball bearing

Although called thrust bearing, bearings at the thrust location in pumps are generally absorbing loads in both the axial and radial directions. A double-row thrust bearing is shown in the ANSI (standardized dimension) process pump of Fig. 5.5. The thrust bearing in this illustration is a double-row angular contact bearing (DRACB) with a single inner ring.

Pump Wisdom Chapter 5

Fig. 5.5: ANSI style centrifugal pump cross-section with double-row thrust bearing circled. Note castellated nut and tab washer

A double-row bearing with two separate inner ring halves is available for applications where somewhat higher loads must be accommodated. The castellated (cog-type) clamping nut and tab washer shown in Fig. 5.5 are required to secure the two inner rings of a double-row bearing to the shaft.

Related Articles

Related Whitepapers

Carlsberg taps into process water reuse with onsite treatment

Carlsberg brewery wants to cut its water use by 50% by 2030. The initiative, Zero Water Waste, is part of Carlsberg’s Together Towards Zero program.…

Water and Wastewater Industry Checklist for Variable Speed Drives

Resilience is the ability to cope with, and recover from, disruption and to anticipate trends and variability in order to maintain services for people and…

Overcoming energy efficiency challenges in the water and wastewater industry

Water demand is continuing to increase as the global population grows. Clean water is required by people for drinking, cooking, and washing, and by industrial…

Always-on Steam Trap Monitoring Yields 2.9x Return & Reduction of CO2 Emissions [Case Study]

In 2020, Trinity Manufacturing, a premier manufacturer of specialty agriculture and water treatment chemicals, engaged Everactive to help deliver on its safety, sustainability, and operational…


Leave a Reply

Your email address will not be published.

Join the #PumpTalk Community

By submitting this form, you are consenting to receive marketing emails from: raybet & raybet 雷竞技 , 2205-C 7th Street, Tuscaloosa, AL, 35401, // 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