Standard: (NFPA) - NFPA T3.6.37


This standard is available for individual purchase.

or unlock this standard with a subscription to IHS Standards Expert

IHS Standards Expert subscription, simplifies and expedites the process for finding and managing standards by giving you access to standards from over 370 standards developing organizations (SDOs).

  • Maximize product development and R&D with direct access to over 1.6 million standards
  • Discover new markets: Identify unmet needs and discover next-generation technologies
  • Improve quality by leveraging consistent standards to meet customer and market requirements
  • Minimize risk: Mitigate liability and better understand compliance regulations
  • Boost efficiency: Speed up research, capture and reuse expertise
For additional product information, visit the IHS Standards Expert page.

For more information or a custom quote, visit the IHS Contact Us page for regional contact information.

Scope and field of application

This standard establishes a method to calculate the theoretical critical column buckling load of a loaded fluid power cylinder. Having the knowledge of the point at which, under ideal theoretical conditions, a hydraulic fluid power cylinder would fail, the designer can then apply an appropriate factor of safety for a safe design.

This standard applies only to pin-mounted (clevis mounts) fluid power cylinders and does not apply to trunnion mounted cylinders.

The method specified in this standard has been compared favorably in several buckling tests of fluid power cylinders in the range of three- to six-inch bores with one- to two-inch piston rods. Accordingly, the application of the method specified in this standard to larger- or smaller-sized cylinder designs should be approached with caution, and traditional methods should be used and compared in order to assure a safe design.

All cylinder installations have some added loads imposed beyond the calculated system pressure. These extra loads are often due to misalignment, friction and weight. As a result, such factors shall be taken into account. In addition, the Hoblit method (see Annex A) provides a theoretical result and as such produces a critical buckling load higher than attainable in controlled laboratory tests. Accordingly, adequate factors of safety shall be applied to ensure that the actual working load is well below the critical buckling load.

Organization: National Fluid Power Association
Document Number: nfpa t3.6.37
Publish Date: 2010-09-07
Page Count: 14
Change Type: REAF
Available Languages: EN
DOD Adopted: NO
ANSI Approved: NO
Most Recent Revision: YES
Current Version: YES
Status: Active

Document History

Document # Change Type Update Date Revision Status
NFPA T3.6.37 Change Type: STCH Update Date: 2010-09-07 Revision: R1 Status: INAC
NFPA T3.6.37 Change Type: REAF Update Date: 1991-06-28 Revision: 91 Status: INAC

This Standard References

Showing 2 of 2.

Standards That Reference This Standard

Showing 1 of 1.