ISO/TC (technical committee) 131 for fluid power systems was established
in 1969. The members of ISO technical committees and sub committees are the
national standards bodies of various nations, e.g. the American National
Standards Institute (ANSI) in the U.S., DIN in Germany, etc. Within ISO/TC
131, the U.S. is one of 16 participating members, also known as P members.
One of a technical committee's or sub committee's P members is selected
to run the committee as the secretariat. The U.S. holds the secretariats of
ISO/TC 131, its sub-committee 4 for connectors and its sub-committee 9 for
installations and systems.
Most of the actual work of drafting international standards is done at
the working group level. These usually come under sub-committees. Members of
working groups are nominated by their national committees and generally
serve as technical experts, not national representatives. However, in actual
practice, experts work closely with their national committees to ensure that
the draft standard that comes out of the working group is acceptable to the
The development of international standards is governed by the ISO/IEC
Directives. During development, international standards go through a series
of stages and, in each stage, have a different designation:
project development flowchart
U.S. TAG to ISO/TC 131 – The U.S. provides input into the development of
international fluid power standards through the U.S. Technical Advisory
Group to ISO/TC 131. The National Fluid Power Association administers the
U.S. TAG on behalf of ANSI. The membership of the U.S. TAG is made up of
more than 150 participants from more than 80 U.S. companies, universities,
government, technical societies and trade associations. The U.S. TAG mirrors
the organization of ISO/TC 131, with its various sub-committees and, where
necessary, working groups. You can find more information about the
leadership, membership and projects of each U.S. TAG subgroup
Membership – Membership in the U.S. TAG is organizational – each entity,
not each person, has one vote. Each member must designate an official
participant; other people from the same organization are listed as
alternates and receive all committee correspondence.
Membership in the U.S. TAG also involves financial support. Unless your
company is a member of the National Fluid Power Association, which provides
the majority of financial support for the activities of ISO/TC 131 and its
U.S. TAG, it will be assessed an annual administrative fee.
for funding the activities of the U.S. TAG to ISO/TC 131
Meetings – The U.S. TAG sub-groups meet two to three times per year,
either in person or by teleconference. Much of U.S. TAG's work, for example
ballots and documents to comment on, is done by correspondence, mainly
through NFPA’s online committee forums.
Committee members may be nominated to serve as working group experts or
sub-committee delegates at an international meeting, and are expected to pay
their own travel expenses. These nominations may be declined.
Responsibilities of members of the U.S. TAG are:
As secretariat, NFPA ensures that U.S. TAG members have the most current
information on international fluid power standards projects. The association
sets up meetings, circulates agendas, minutes and pertinent documents,
administers ballots and tallies the results to ensure that due process
procedures are followed.
Apply for membership in U.S. TAG to ISO/131