International Fluid Power Standards Development Experts Converge on London

In October, the British Fluid Power Association hosted the annual ISO Technical Committee 131 – Fluid Power Standards development meetings at the British Standards Institute (BSI) headquarters in London, United Kingdom.  Sixteen separate subcommittee and working group meetings were held during this week long event.  Seventy-eight technical experts from all over the world came together to discuss standards in the fluid power industry.  Delegations included representation from the ISO-member countries in the U.S., UK, Sweden, Poland, South Korea, Japan, Italy, the Netherlands, Germany, France, and China.  The experts came from NFPA member and non-member companies and end-user companies such as Bosch Rexroth, CETIM, Emerson, Argos Hytos, Eaton, Festo, Parker Hannifin, SMC, John Deere, Pall, Daman Products, Lydall, and Stauff.  As NFPA members know, standards work to stimulate trade and overcome artificial trade barriers, helping to make companies, industries, and economies more competitive. A sampling of the projects currently underway include:

  • Revision of ISO 5598:1985, Fluid power systems – Vocabulary. This document provides users with pertinent terms having specific meanings in fluid power technology. The subcommittee has determined that there needs to be a way to perform continuous maintenance on this standard in order to keep users updated on the fluid power vocabulary for all fluid power systems and components.
  • Adding length tolerances in ISO 17165-1, Hydraulic fluid power – Hose assemblies – Part 1: Dimensions and requirements. The working group discussed the importance of adding a minimum pre-hose length to the existing standard. A proposal will be developed and presented to the group at the next meeting.
  • Adding a possible new annex to ISO 6358-1, Pneumatic fluid power – Determination of flow-rate characteristics of components using compressible fluids – Part 1: General rules and test methods for steady-state flow. The working group generally agreed that it was important to add a measurement on the power loss in a pneumatic valve into this document. Proposals will be forth-coming.

In addition to the subcommittee meetings, TC 131 technical experts came together to discuss energy efficiency in regards to customer issues and competition from the electrical and mechanical industries. The general opinion of the technical experts was that energy issues of fluid power systems were more important. It was suggested that component proposals could use the energy equation and that it may be applied to a system – but that it may be very difficult.  Continued effort is needed to determine a path forward in regard to measuring energy efficiency of fluid power systems.

If you would like to learn more about how you can get involved in fluid power standards contact Denise Rockhill at

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