Hello again everybody, and welcome to the newest entry in the NFPA Standards Roundup article series! Each month, we provide a high-level recap of the latest standards development activities across ISO/TC 131.
October featured the Fall 2026 In-Person Meeting Cluster. Occurring in Istanbul, Türkiye, there were 15 meetings held over the week of October 19th. For the sake of brevity, we will be highlighting the Working Group meetings and active project work, though a summary of the conversation in the Technical Committee will also be included. The order is based on the chronological meeting order during the week.
Experts met to discuss comments received across a large portfolio of active projects, including:
ISO/DIS 6020-1 (Hydraulic fluid power – Mounting dimensions for single rod cylinders, 16 MPa (160 bar) series – Part 1: Medium series)
ISO/DIS 6022 (Hydraulic fluid power – Mounting dimensions for single rod cylinders, 25 MPa (250 bar) series)
ISO/DIS 8132 (Hydraulic fluid power – Mounting dimensions for accessories for single rod cylinders, 16 MPa (160 bar) medium and 25 MPa (250 bar) series)
ISO/DIS 8133 (Hydraulic fluid power – Mounting dimensions for accessories for single rod cylinders 16 MPa (160 bar) compact series
ISO/WD 4395 (Fluid power systems and components – Cylinder piston rod end types and discussions)
ISO/TS 13725 (Hydraulic fluid power – Method for evaluating the buckling – load of a hydraulic cylinder)
There were also a number of Systematic Reviews discussed.
Experts met to discuss comments received, as well as higher-level project planning across a variety of topics, including:
ISO/PWI 11943-1 (Hydraulic fluid power – Online automatic particle-counting systems for liquids – Part 1: Methods of validating the hydraulic circuits) and -2 (Part 2: Methods of performing calibration).
There was productive conversation, and both projects are expected to be officially activated in the coming months.
An additional call for Ultra Fine Testing Dust data has been extended to members.
ISO/PWI 21018-5 (Hydraulic fluid power – Part 5: Digital Imaging Analysis of contaminants) and new Dynamic Imaging Analysis Proposal.
Conversation about the limitations of ISO 13322-2 in the hydraulic industry specifically and how to address them.
ISO/TR 24828 (De-aeration in hydraulics).
A draft was shared with focus on new schematics.
Experts met to discuss active projects, with a heavy emphasis on ISO 3601-5 (Fluid power systems – O-rings – Part 5: Specification of elastomeric materials for industrial applications).
There were numerous changes in material property limits, based on the shared understanding that physical property limits should be relatively consistent with current standard 70 and 90 IRHD material limits. Additional conversation will be taking place on November 18th to review and finalize AEM and CR content.
Additionally, this project was officially activated, and the 36-month timeline has begun.
There was additional discussion on ISO/TR 26033 (Hydraulic fluid power – O-rings – Choice, control and management of supplies). Significant progress was made regarding comment resolution, though additional conversation will be required during November 18th meeting. Project activation expected in early 2027.
Conversation focused around ISO 6194-6 (Rotary-shaft lip-type seals incorporating elastomeric sealing elements – Part 6: Specification of elastomeric materials), namely on the Tensile and Elongation at Break properties as proposed in the Fall 2025 In-Person Meeting Cluster. There is concern about too great a reduction in these limits, with more conversation to occur before project progresses.
There was also conversation regarding an update to ISO 6194-2 (Rotary shaft lip-type seals incorporating elastomeric sealing elements – Part 2: Vocabulary). Based on a presentation shared by Dave Sakata, experts agreed that an update was necessary. However, it became evident that ISO 6194-1 (Rotary shaft lip-type seals incorporating elastomeric sealing elements – Part 1: Nominal dimensions and tolerances) would need to be updated first. Dave Sakata has taken on the role of Project Leader for this update.
There was discussion about a new standard test for piston seals in hydraulic cylinders, proposed as ISO 7986-2. The Subcommittee agreed, though the knowledge base required exceeds the scope of SC 7. More information can be found under TC 131.
Experts discussed comments received from a couple active projects, including:
ISO/DIS 6403 (Hydraulic fluid power – Valves controlling flow and pressure – Test methods).
ISO/CD 9461 (Hydraulic fluid power – Identification of valve ports, subplates, control devices and solenoids).
There were also a number of Systematic Reviews discussed.
Experts discussed comments received from a couple active projects, including:
ISO 18582-1 (Fluid power – Specification of reference dictionary – Part 1: General overview on organization and structure).
ISO/FDIS 18582-3 (Fluid power – Specification of reference dictionary – Part 3: Definitions of classes and properties of hydraulics).
The Technical Committee discussed the Secretariat Report, as well as pertinent Working Group Reports as is typical. Additional points of conversation included:
The merging of the Spring and Fall Meeting Clusters into one, united Meeting Cluster:
There was passionate debate regarding the positive and negative consequences of this idea, and multiple proposals to try to maximize in-person attendance, while minimizing travel burden.
After a vote, the decision was made to maintain the current schedule as it is.
Strategic Business Plan:
To account for an updated template provided by ISO, the Strategic Business Plan will be delayed until 2027.
Participants in the Technical Committee are encouraged to submit feedback or requests to leadership in Q1 2027.
ISO 7986-2:
Proposal for a new standard test for piston seals in hydraulic cylinders.
To ensure sufficient base of knowledge, an Ad-Hoc Working Group has been established directly under TC 131 to develop a draft.
Ozan Devlen has volunteered as the Project Leader on this initiative, and a Call for Experts has been issued for:
Pump Manufacturers (SC 2)
Valve Manufacturers (SC 5)
Cylinder and System Integrators (SC 3, SC 9)
Experts met and discussed multiple active projects, including:
ISO/CD 10767-1 (Hydraulic fluid power – Determination of pressure ripple levels generated in systems and components – Part 1: Method for determining source flow ripple and source impedance of pumps)
ISO/WD 412-1 (Hydraulic fluid power – Test code for determination of airborne sound levels – Part 1: Pumps)
ISO/WD 4412-2 (Hydraulic fluid power – Test code for determination of airborne sound levels – Part 2: Motors)
The ISO 15086 Series (Hydraulic fluid power – Determination of the fluid-borne noise characteristics of components and systems) was also discussed, with the following results:
ISO 15086-3 (Part 3: Measurement of hydraulic impedance): Will be addressed in the Fall 2027 In-Person Meeting Cluster in Frankfurt.
ISO 15086-4 (Part 4: Measurement of speed of sound in a fluid in a pipe using transfer matrix method): A PWI will be registered with planning to begin for activation.
ISO 15086-5 (Part 5: Measurement of speed of sound in a fluid in a pipe using closed conduit method): A PWI will be registered with planning to begin for activation.
There were also a number of Systematic Reviews discussed.
Experts met to discuss ISO 1219-1 (Fluid power systems and components – Graphical symbols and circuit diagrams – Part 1: Graphical symbols for conventional use and data-processing applications). This standard will be registered as a PWI, with planning for a revision to begin.
Conversation focused around the activation of ISO 5598 (Fluid power systems and components – Vocabulary). Responses to the submitted feedback and comments were discussed, and a ballot to progress this project to the New Project stage will be coming soon.
This standard will be assigned to SC 1/WG 2 for development.
In addition to the Spring Meeting Cluster, the following meetings are coming soon:
The development and approval process for SRM 2806e has been completed, and can be purchased here.
The Spring 2027 In-Person Meeting Cluster will be taking place the week of May 16th in Beijing, China. The focus will be on the Subcommittee and Working Groups dedicated to Connectors, as well as Pneumatics. Planning will begin soon.
If you are interested in participating in standards development—either at the TAG or ISO level—or would like more information on any of these activities, please reach out to Ben Brown at bbrown@nfpa.com.