NFPA recently hosted a week-long group of 40+ delegates representing the U.S. and other International Standards Organization (ISO) member bodies from around the world in San Antonio, Texas. There were 15 U.S. experts from various U.S. Technical Advisory Groups (TAGs) attending on behalf of the U.S. fluid power industry. The remaining delegates came from China, Japan, South Korea, France, Germany, and the United Kingdom.
Along with the TC 131 plenary meeting, subcommittees and working groups met individually to discuss ongoing projects, systematic reviews of older standards, and proposals on new areas of work on topics such as energy efficiency, water hydraulics and fluid power terminology.
In the working group on positive-displacement pumps, motors and integral transmissions – Method of testing, Jack Johnson from the U.S. addressed many concerns resulting from a recent new work item proposal ballot mathematical models for positive displacement pumps. This standard is being proposed by the U.S. to become a starting point for efficiency standards in hydraulics, much like there are in the electric industry. The experts agreed that there was merit in using a model to reduce the number of testing points and decrease manufacturing costs. However, they felt that additional research needed to be done in this area before an actual standard could be developed. They have asked the U.S. experts to provide further information to the mirror technical advisory groups in other countries so that individual countries could have a national discussion prior to the next international meeting.
The working group on fluid power vocabulary continues to add to and revise the “living” standard (ISO 5598) on fluid power terms, symbols and definitions. This standard, currently at 190 pages, continues to grow along with the industry. Group discussion included how to manage changes, number the clauses, and the possibility of eventually having an electronic version of the standard.
In the pneumatic control products committee, the work continues on the measurement of minimum shifting operating pressure of pneumatic valves and the measurement of shifting time of pneumatic poppet valves.
In the TC 131 plenary meeting, the delegates listened to two new proposals regarding EPPR valves for excavators from South Korea and the need for ADS (water hydraulics) standards from Japan. Upon a lengthy discussion and many questions from the experts, neither proposal garnered approval to move forward.
The next ISO/TC 131 meetings are scheduled for October 9-13, 2017 in Winterthur, Switzerland. The following subcommittees and working groups will have meetings:
TC 131/WG 1 – Accumulators
SC 1/WG 1 – Graphic symbols and circuit diagrams
SC 3/WG 1 – Hydraulic cylinders mounting dimensions
SC 3/WG 2 – Pneumatic cylinder mounting dimensions
SC 3/WG 4 – Cylinder identification code
SC 4 – Connectors and similar products/components
SC 4/WG 1 – Port and fitting end
SC 4/WG 2 – Flange port connectors
SC 4/WG 4 – Hydraulic quick-action couplings
SC 4/WG 6 – Hose couplings & tube connection methods
SC 4/WG 9 – Pneumatic Connectors
SC 5/WG 5 – Treatment of air
SC 6 – Contamination control
SC 6/WG 1 – Sampling, contamination analysis and reporting
SC 6/WG 2 – Filter and separator evaluation
SC 6/WG 3 – Component and system cleanliness
NFPA is the secretariat to ISO technical committee (TC 131) on fluid power systems and administrator for 11 fluid power ANSI U.S. Technical Advisory Groups (TAGs). NFPA member companies are encouraged to participate in standards development for the fluid power industry. Click here to learn how you can get involved.